Wisdom
-
wisdom: 智慧；才智；精明 the ability to make sensible decisions and give good advice because of the experience and knowledge that you have
-
wit:
- 第一层，大脑。理解力；颖悟力；头脑；智力your ability to think quickly and clearly and to make good decisions
- 第二层，嘴或手。措辞巧妙的能力；风趣；才思the ability to say or write things that are both clever and amusing
- 第三层，人。才思敏捷说话诙谐的人；机智幽默的人a person who has the ability to say or write things that are both clever and amusing


*Contact us form the address or fill the form below
Address :- V3courier office, office no 938,13th floor,Mittel Tower, near city bank, Mahatma Ghandi road( MG road ), Ashok nagar, Bengaluru, Karnataka, India-560001. Email ID :-<EMAIL_ADDRESS>Phone No:-<PHONE_NUMBER>4/28566666/28567932.


What on earth is Île de Rêve?
Well, Île de Rêve is a ‘dream island’, our first LP. Something that has been long in the making. In fact, it was exactly ten years ago (in 2009) that I headed over to Martin’s house, armed with a copy of Judith Schalansky’s Atlas of Remote Islands and a few scruffily hand-written pages of notes on some of the stories contained within I thought were interesting.
We poured over the stories and set about creating musical accompaniments to them, messing around with guitar pedals and a tape recorder from the attic - bits of hardware we now take for granted but started taking seriously for the first time.
Those early demos never saw the light of day, but in some ways, Private Agenda was born of those sessions, although it didn’t exist in name till years later.
Once we started talking to Lo Recordings about an album, we dipped back into our old notes and old demos for inspiration. Île de Rêve seemed to capture perfectly the conceptual and musical world we wanted to create together.
As much as islands are places were born and raised, conditioning our world-views, narrowing them and expanding them at times, they’re also a figment of our imaginations and ideal places for a great story. Perhaps that’s why the island trope has been such an enduring theme in literature and the arts.
Now, island stories act as artistic inspiration for our latest project. Collectively, nine surreal, downtempo sketches.
So there you have it, futures past.


This time, two, not one
问题描述 :
I konw you guys have solve so many problems about increasing sequence, this time, a little change has been made.
Assume that there is a sequence S = {s1, s2, s3, …, sn}, si = (xi, yi).You should find two increasing subsequence L1 and L2, and they have no common elements, means L1∩L2 = φ, and the sum of their lenth is as max as possible.
Here we assume si > sj is that (xi > xj && yi > yj) or (xi >= xj && yi > yj) or (xi > xj && yi >= yj). I will ensure that all elements’ coordinates are distinct, i.e., si != sj (i!=j).
Assume that there is a sequence S = {s1, s2, s3, …, sn}, si = (xi, yi).You should find two increasing subsequence L1 and L2, and they have no common elements, means L1∩L2 = φ, and the sum of their lenth is as max as possible.
Here we assume si > sj is that (xi > xj && yi > yj) or (xi >= xj && yi > yj) or (xi > xj && yi >= yj). I will ensure that all elements’ coordinates are distinct, i.e., si != sj (i!=j).
输入:
The input consists of multiple test cases. Each case begins with a line containing a positive integer n that is the length of the sequence S, the next n lines each contains a pair integers (xi, yi), i = 1,…n.1 <= n <= 5000,1<=xi,yi<=2^31.
输出:
The input consists of multiple test cases. Each case begins with a line containing a positive integer n that is the length of the sequence S, the next n lines each contains a pair integers (xi, yi), i = 1,…n.1 <= n <= 5000,1<=xi,yi<=2^31.
样例输入:
3 1 3 3 1 2 2 4 1 2 2 1 4 3 3 4
样例输出:
2 4 Hint: In the second case, you can make L1 = {(1,2), (3,4)} and L2 = {(2,1), (4,3)}, or L1 = {(1,2), (4,3)} and L2 = {(2,1), (3,4)}.
(adsbygoogle = window.adsbygoogle || []).push({});
上帝来看你了
这个差别应该不会太大，或许编辑器就自动优化成内联函数了
很高兴你会喜欢这个网站。目前还没有一个开发团队，网站是我一个人在维护，都是用的开源系统，也没有太多需要开发的部分，主要是内容整理。非常感谢你的关注。
这个问题别太纠结了，不同的编译器结果不一
真考人啊
刚开始学习，为啥会报错了
秒！~
mark, 很巧妙的实现！
对，算是枚举吧，已修正
最长回文子串可以使用manacher算法，将时间复杂度降到O(n)。
都是一些基础题啊
写的好····· Pollard Rh
好厉害～
有点意思


Annex@272 Hardware Admin
Parts
Add Part
Hardware Requests
Sign Out
Part name
Description
Location
Resources
quantity
More info


--- layout: page title: About header-img: "img/about-bg.png" ---
thoughts on why I'm taking this course


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botanical
Garden
HERBARIUM
OF
THE
EXPERIMENT
STATION
OF
THE
PORTO
RIOO
SUGAR
GROWER'S
ASSOCIATION.
RIO
PIEDRAS,
P.
R.
-
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,
Acc.
No.
Co11-
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¥
<¨:,*^v/MrV'
Identified
by
L¡Ò,lty
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>IMAGED
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BOTANICAL
GARDEN
01008214
Legend -
Level of confidence that token is an accurately-transcribed word
extremely low
very low
low
undetermined
medium
high
very high


Before Change
def test_wider_conv():
model = to_stub_model(get_conv_model(), True)
assert isinstance(wider_pre_conv(model.layers[2], 3), StubConv)
assert isinstance(wider_bn(model.layers[3], 3, 3, 3), StubBatchNormalization)
assert isinstance(wider_next_conv(model.layers[6], 3, 3, 3), StubConv)
After Change
def test_wider_conv():
model = DefaultClassifierGenerator(10, (28, 28, 3)).generate().produce_model()
model.set_weight_to_graph()
graph = model.graph
assert isinstance(wider_pre_conv(graph.layer_list[1], 3), StubConv)
assert isinstance(wider_bn(graph.layer_list[2], 3, 3, 3), StubBatchNormalization)
assert isinstance(wider_next_conv(graph.layer_list[6], 3, 3, 3), StubConv)


{% extends 'zinnia/base.html' %} {% load static %} {% block main_header %}
DataScientist | Operations Research Analyst | Statistician | Medical Laboratory Technologist
I am all about data, ^1000 bringing smart solutions through data.
^1000How to bring data driven solutions to everyday problems.
^1000 I have a good medical background ^1000 having worked as a medical laboratory technician
^1000 During that period i was studying Operations Research and Statistics.
^1000 I am a self taught Data Scientist building up from SORS.
^1000 I am also a Django Website Developer learning R
{{ service.content|safe }}
You have no serviced added yet
{% endfor %}No Subjects Yet
{% endfor %}Start adding some technologies
{% endfor %}


About Ratify
Ratify is a collection of utilities to perform validation checks and parsing. The main intention of usage for this is in web-applications in order to check form inputs for correctness and automatically parse them into their proper representations or return meaningful errors.
How To
Ratify has a load of TEST-*
functions, each accompanied by a predicate equivalent. The TEST-*
functions will signal errors of type RATIFICATION-ERROR
if the test fails, whereas the predicates will simply return NIL
. Both will return the passed argument unmodified on success. Some of the tests have an equivalent PARSE-*
function in order to turn the string into a more useful representation.
The main interaction with Ratify is not supposed to be directly with the TEST-*
and PARSE-*
functions however, but rather through the TEST
and PARSE
wrapper functions. Both also have a macro shorthand to perform many tests and parsings at once, PERFORM-COMBINED-TESTS
and WITH-PARSED-FORMS
. These macros will perform as many tests as possible and only signal an error right after all tests have been made. This error is of type COMBINED-ERROR
, which contains all the errors that occurred during the testing.
(ratify:perform-combined-tests
(:integer "45")
(:date "2014-08-01")
(:ratio "566/21"))
(ratify:perform-combined-tests
(:integer "4.5" "e")
(:date "2014-08-01" "2014" "2014-55-99")
(:ratio "566/21" "5.6/21"))
; Evaluation aborted on #<RATIFY-TESTING:COMBINED-ERROR {10074E51D3}>.
Or to perform parsing:
(let ((int "45")
(url "http://foo.bar/baz.jp?what=ever#hashtag")
(uri "things-are://sometimes:complicated@with-all.these/damn?protocols=i'm#telling+you!")
(dt "2014-08-01T21:23:01"))
(ratify:with-parsed-forms ((:integer int) (:url url) (:uri uri) (:datetime dt))
(list int url uri dt)))
If an error occurs, the ERRORS
function gives access to the list of errors that the COMBINED-ERROR
contains. For a complete list of testing and parsing functions, please see the symbol index. The syntax grammar used to describe the valid values in the docstrings of each test is regex with the addition of <brackets>
to refer to other tests, sometimes accompanied with a second line that describes limits of the values.


Click on a vehicle on the map and select Display HOS data from the menu. This will give you a summary of data related to HOS and DVIR.
()
Loading


Editing A Keymap |
First, click on the File menu and then select Open:
Next, browse to the top level folder for your game project:
Click OK. Your project's current key map will be loaded. If you have not used this tool before, the key map will be removed from it's default location in game/scripts/gui/optionsDlg.cs and placed in a new game/scripts/gui/keyMap.cs file. An execute statement will be added to optionsDlg.cs to execute the new file before processing the rest of optionsDlg.cs.
To edit entries, simply edit the text in place.
To remove entries, select the row and hit the Delete key.
To add entries, scroll to the bottom of the list and edit the empty entry. Your new text will be added.
When you are done editing, click the File menu and select Save:


Syntax
Query types
An FQL query must return a result indicated by usage either of the RETURN
or FOR IN
or FOR WHILE
keywords. The FQL parser will return an error if it cannot find any of these two statements.
Whitespace
Whitespaces (blanks, carriage returns, line feeds, and tab stops) can be used in the query text to increase its readability. Tokens have to be separated by any number of whitespaces. Whitespace within strings or names must be enclosed in quotes in order to be preserved.
Comments
Comments can be embedded at any position in a query. The text contained in the comment is ignored by the FQL parser.Multi-line comments cannot be nested, which means subsequent comment starts within comments are ignored, comment ends will end the comment.
FQL supports two types of comments:
- Single line comments: These start with a double forward slash and end at the end of the line, or the end of the query string (whichever is first).
- Multi line comments: These start with a forward slash and asterisk, and end with an asterisk and a following forward slash. They can span as many lines as necessary.
Keywords
On the top level, FQL offers the following operations:USE
: allows the use of types in a namespace without typing full type path.FOR
: iteration over a data source or logical conditionRETURN
: results projectionFILTER
: non-view results filteringSEARCH
: view results filteringSORT
: result sortingLIMIT
: result slicingLET
: variable assignmentCOLLECT
: result grouping
Each of the above operations can be initiated in a query by using a keyword of the same name. An FQL query can (and typically does) consist of multiple of the above operations.
An example FQL query may look like this:
In this example query, the terms FOR
, FILTER
, and RETURN
initiate the higher-level operation according to their name. These terms are also keywords, meaning that they have a special meaning in the language.
For example, the query parser will use the keywords to find out which high-level operations to execute. That also means keywords can only be used at certain locations in a query. This also makes all keywords reserved words that must not be used for other purposes than they are intended for.
At this moment, keywords are not case-insensitive, meaning they cannot be specified in lower or mixed case in queries.
There are a few more keywords in addition to the higher-level operation keywords. Additional keywords may be added in future versions of Ferret. The complete list of keywords is currently:
- AGGREGATE
- ALL
- AND
- ANY
- ASC
- COLLECT
- DESC
- DISTINCT
- FALSE
- FILTER
- FOR
- IN
- WHILE
- LET
- LIMIT
- NONE
- NOT
- NULL
- OR
- RETURN
- SORT
- TRUE
Names
In general, names are used to identify objects (properties, variables, and functions) in FQL queries.The maximum supported length of any name is 64 bytes. Names in FQL are always case-sensitive.
Keywords must not be used as names. If a reserved keyword should be used as a name, the name must be enclosed in single or double quotes. Enclosing a name in quotes makes it possible to use otherwise reserved keywords as names. An example for this is:
Variable names
FQL allows the user to assign values to additional variables in a query. All variables that are assigned a value must have a name that is unique within the context of the query.Allowed characters in variable names are the letters a to z (both in lower and upper case), the numbers 0 to 9, the underscore (_) symbol and the dollar ($) sign. A variable name must not start with a number. If a variable name starts with the underscore character, the underscore must be followed by least one letter (a-z or A-Z) or digit (0-9).


Not everything on Disney+ is kid safe, so will there be parental controls?
Source: Chris Wedel/Android Central
Best answer: Yes, you can set up profiles on your Disney Plus (Disney+) account as a "kid" profile to filter content within the predetermined rating group (G, TV-Y, TV-Y7/Y7-FV, TV-G). At this time, it's unclear if further content filtering will be available.
- Magic is waiting: Disney+ (From $7/mo at Disney+)
Safety first
Disney movies and their characters hold a special place in the lives of so many people. While some of us may only be a kid at heart, some fans are still actually children. A lot of what folks think of when it comes to Disney movies are classics like Mickey Mouse, Snow White, Toy Story, Up, and so many more. Though content like that is quite wholesome, not all of the shows that will be available on Disney+ will be appropriate for children.
Error Code 70 will appear on the screen when content is restricted due to current profile settings.
Disney houses more than just the Mickey and the gang. Disney also has the Marvel universe, Star Wars, Fox and more, so there is going to be things on Disney+ that need to be monitored for children. Thankfully Disney has thought of a way to help sort this out for us by letting you set up profiles on your account.
How do parental controls work?
Much like you can do with Netflix, you can set up a profile for you, your significant other, and kids to not only keep your content and suggestions the way you prefer but also to filter appropriate programming for children. When you create a profile and designate it as an account for a kid, Disney is going to allow only content that falls into a predetermined rating group (G, TV-Y, TV-Y7/Y7-FV, TV-G).
| Content Rating | Popular Titles in Category |
|---|---|
| G | The Aristocats, The Lion King |
| TV-G | Phineas & Ferb, Chip 'N Dale Rescue Rangers |
| TV-Y | The Lion Guard, Handy Manny |
| TV-Y7 | Duck Tales, Tale Spin |
| PG | Bolt, UP |
It's unclear if there are plans for further controls within that group should you want to narrow that filter down further and not allow content for a seven-year-old to be available for your four-year-old, for example.
Disney is also allows up to four simultaneous streams on an account. This means that a family could have The Mandalorian playing on a tablet in one room, National Geographic's Magic of the Animal Kingdom streaming on a phone in another room, Captain Marvel on the big screen in the living room, and Finding Nemo playing in the kids' playroom all at the same time. Just make sure that you have internet connection and data available available to do it.
A Modern classic
Disney+
81 years of magic in one place
Disney+ is the first service that will have everything Disney offers in one place. We're talking Marvel, Star Wars, National Geographic, Pixar, Disney Channel, and more.
We may earn a commission for purchases using our links. Learn more.


[Articles] Article Curating Thing
I Read A LOT!
Like really, a lot. While I was reading one day I thought “hmm maybe others would like to read these articles too.” These could be tutorials, news, new tools, or anything interesting. So I’m starting by just posting a list every now and then of recent articles I have read that I think others should check out.
With That Let’s Get Into It
1. Github Security Alerts
Github recently announced that using their dependency graph feature, developers could receive alerts when one of those dependencies have a reported vulnerability. Using some machine learning, Github will attempt to tell you how to fix or approach the vulnerability.
It should be stressed that this does not replace developer due diligence, but should be used in conjunction to security protocols and plans.
2. Every Javascript Framework Tutorial Written More Than 5 Minutes Ago
Roger Collier goes over an experience with javascript tutorials, while making fun of / attacking the culture of using a million tools and features to launch a simple application. I found it to be more satire and addressing a bigger issue in the javascript community. The over tooling of frameworks.
3. The Most Important Rule In UX Design That Everyone Breaks
How does your layout work with how much multi-tasking and memory users are able to achieve? This article attempts to tackle that question and put forth some solutions to how many elements and groups should be in the active page of a UI/UX.
4. Developing a Google Chrome Extension using Angular 4
Tackling the tricky task of developing google chrome extensions with angular 4. Turns out not to be that tricky at all.
5. Learn & Understand JavaScript’s Reduce Function
This covers the use of reduce to provide a single value output from an array of values. Example initially covered in the article is an array summation of integer values. This function can be used to simplify both code complexity and readability.
Conclusion
I’ll start with 5 articles at a time, and see how people like it. I don’t do emails, so to get updates you’ll have to come checkout the site from time to time.
For now Ciao!


Hoo boy, it's another page
About Having Clicked Here
Now that you've clicked here, there's going to be more text.
Going Back
You can go back to the main page by clicking
here
.


|
JavaTM 2 Platform Standard Ed. 5.0 |
|||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object javax.swing.table.DefaultTableColumnModel
public class DefaultTableColumnModel
The standard column-handler for a JTable
.
Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeansTM
has been added to the java.beans
package.
Please see XMLEncoder
.
JTable
| Field Summary | |
|---|---|
protected ChangeEvent |
changeEvent
Change event (only one needed) |
protected int |
columnMargin
Width margin between each column |
protected boolean |
columnSelectionAllowed
Column selection allowed in this column model |
protected EventListenerList |
listenerList
List of TableColumnModelListener |
protected ListSelectionModel |
selectionModel
Model for keeping track of column selections |
protected Vector<TableColumn> |
tableColumns
Array of TableColumn objects in this model |
protected int |
totalColumnWidth
A local cache of the combined width of all columns |
| Constructor Summary | |
|---|---|
DefaultTableColumnModel()
Creates a default table column model. |
| Method Summary | ||
|---|---|---|
void |
addColumn(TableColumn aColumn)
Appends aColumn to the end of the
tableColumns array. |
|
void |
addColumnModelListener(TableColumnModelListener x)
Adds a listener for table column model events. |
|
protected ListSelectionModel |
createSelectionModel()
Creates a new default list selection model. |
|
protected void |
fireColumnAdded(TableColumnModelEvent e)
Notifies all listeners that have registered interest for notification on this event type. |
|
protected void |
fireColumnMarginChanged()
Notifies all listeners that have registered interest for notification on this event type. |
|
protected void |
fireColumnMoved(TableColumnModelEvent e)
Notifies all listeners that have registered interest for notification on this event type. |
|
protected void |
fireColumnRemoved(TableColumnModelEvent e)
Notifies all listeners that have registered interest for notification on this event type. |
|
protected void |
fireColumnSelectionChanged(ListSelectionEvent e)
Notifies all listeners that have registered interest for notification on this event type. |
|
TableColumn |
getColumn(int columnIndex)
Returns the TableColumn object for the column
at columnIndex . |
|
int |
getColumnCount()
Returns the number of columns in the tableColumns array. |
|
int |
getColumnIndex(Object identifier)
Returns the index of the first column in the tableColumns
array whose identifier is equal to identifier ,
when compared using equals . |
|
int |
getColumnIndexAtX(int x)
Returns the index of the column that lies at position x ,
or -1 if no column covers this point. |
|
int |
getColumnMargin()
Returns the width margin for TableColumn . |
|
TableColumnModelListener[] |
getColumnModelListeners()
Returns an array of all the column model listeners registered on this model. |
|
Enumeration<TableColumn> |
getColumns()
Returns an Enumeration of all the columns in the model. |
|
boolean |
getColumnSelectionAllowed()
Returns true if column selection is allowed, otherwise false. |
|
|
getListeners(Class<T> listenerType)
Returns an array of all the objects currently registered as FooListener s
upon this model. |
|
int |
getSelectedColumnCount()
Returns the number of columns selected. |
|
int[] |
getSelectedColumns()
Returns an array of selected columns. |
|
ListSelectionModel |
getSelectionModel()
Returns the ListSelectionModel that is used to
maintain column selection state. |
|
int |
getTotalColumnWidth()
Returns the total combined width of all columns. |
|
void |
moveColumn(int columnIndex,
int newIndex)
Moves the column and heading at columnIndex to
newIndex . |
|
void |
propertyChange(PropertyChangeEvent evt)
Property Change Listener change method. |
|
protected void |
recalcWidthCache()
Recalculates the total combined width of all columns. |
|
void |
removeColumn(TableColumn column)
Deletes the column from the
tableColumns array. |
|
void |
removeColumnModelListener(TableColumnModelListener x)
Removes a listener for table column model events. |
|
void |
setColumnMargin(int newMargin)
Sets the column margin to newMargin . |
|
void |
setColumnSelectionAllowed(boolean flag)
Sets whether column selection is allowed. |
|
void |
setSelectionModel(ListSelectionModel newModel)
Sets the selection model for this TableColumnModel
to newModel
and registers for listener notifications from the new selection
model. |
|
void |
valueChanged(ListSelectionEvent e)
A ListSelectionListener that forwards
ListSelectionEvents when there is a column
selection change. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
|---|
protected Vector<TableColumn> tableColumns
protected ListSelectionModel selectionModel
protected int columnMargin
protected EventListenerList listenerList
protected transient ChangeEvent changeEvent
protected boolean columnSelectionAllowed
protected int totalColumnWidth
| Constructor Detail |
|---|
public DefaultTableColumnModel()
| Method Detail |
|---|
public void addColumn(TableColumn aColumn)
aColumn
to the end of the
tableColumns
array.
This method also posts the columnAdded
event to its listeners.
addColumn
in interface TableColumnModel
aColumn
- the TableColumn
to be added
IllegalArgumentException
- if aColumn
is
null
removeColumn(javax.swing.table.TableColumn)
public void removeColumn(TableColumn column)
column
from the
tableColumns
array. This method will do nothing if
column
is not in the table's columns list.
tile
is called
to resize both the header and table views.
This method also posts a columnRemoved
event to its listeners.
removeColumn
in interface TableColumnModel
column
- the TableColumn
to be removedaddColumn(javax.swing.table.TableColumn)
public void moveColumn(int columnIndex, int newIndex)
columnIndex
to
newIndex
. The old column at columnIndex
will now be found at newIndex
. The column
that used to be at newIndex
is shifted
left or right to make room. This will not move any columns if
columnIndex
equals newIndex
. This method
also posts a columnMoved
event to its listeners.
moveColumn
in interface TableColumnModel
columnIndex
- the index of column to be movednewIndex
- new index to move the column
IllegalArgumentException
- if column
or
newIndex
are not in the valid rangepublic void setColumnMargin(int newMargin)
newMargin
. This method
also posts a columnMarginChanged
event to its
listeners.
setColumnMargin
in interface TableColumnModel
newMargin
- the new margin width, in pixelsgetColumnMargin()
,
getTotalColumnWidth()
public int getColumnCount()
tableColumns
array.
getColumnCount
in interface TableColumnModel
tableColumns
arraygetColumns()
public Enumeration<TableColumn> getColumns()
Enumeration
of all the columns in the model.
getColumns
in interface TableColumnModel
Enumeration
of the columns in the modelpublic int getColumnIndex(Object identifier)
tableColumns
array whose identifier is equal to identifier
,
when compared using equals
.
getColumnIndex
in interface TableColumnModel
identifier
- the identifier object
tableColumns
array whose identifier
is equal to identifier
IllegalArgumentException
- if identifier
is null
, or if no
TableColumn
has this
identifier
getColumn(int)
public TableColumn getColumn(int columnIndex)
TableColumn
object for the column
at columnIndex
.
getColumn
in interface TableColumnModel
columnIndex
- the index of the column desired
TableColumn
object for the column
at columnIndex
public int getColumnMargin()
TableColumn
.
The default columnMargin
is 1.
getColumnMargin
in interface TableColumnModel
TableColumn
setColumnMargin(int)
public int getColumnIndexAtX(int x)
x
,
or -1 if no column covers this point.
In keeping with Swing's separable model architecture, a
TableColumnModel does not know how the table columns actually appear on
screen. The visual presentation of the columns is the responsibility
of the view/controller object using this model (typically JTable). The
view/controller need not display the columns sequentially from left to
right. For example, columns could be displayed from right to left to
accomodate a locale preference or some columns might be hidden at the
request of the user. Because the model does not know how the columns
are laid out on screen, the given xPosition
should not be
considered to be a coordinate in 2D graphics space. Instead, it should
be considered to be a width from the start of the first column in the
model. If the column index for a given X coordinate in 2D space is
required, JTable.columnAtPoint
can be used instead.
getColumnIndexAtX
in interface TableColumnModel
x
- the horizontal location of interest
JTable.columnAtPoint(java.awt.Point)
public int getTotalColumnWidth()
getTotalColumnWidth
in interface TableColumnModel
totalColumnWidth
propertypublic void setSelectionModel(ListSelectionModel newModel)
TableColumnModel
to newModel
and registers for listener notifications from the new selection
model. If newModel
is null
,
an exception is thrown.
setSelectionModel
in interface TableColumnModel
newModel
- the new selection model
IllegalArgumentException
- if newModel
is null
getSelectionModel()
public ListSelectionModel getSelectionModel()
ListSelectionModel
that is used to
maintain column selection state.
getSelectionModel
in interface TableColumnModel
null
if row selection is not allowed.setSelectionModel(javax.swing.ListSelectionModel)
public void setColumnSelectionAllowed(boolean flag)
setColumnSelectionAllowed
in interface TableColumnModel
flag
- true if column selection will be allowed, false otherwiseTableColumnModel.getColumnSelectionAllowed()
public boolean getColumnSelectionAllowed()
getColumnSelectionAllowed
in interface TableColumnModel
columnSelectionAllowed
propertyTableColumnModel.setColumnSelectionAllowed(boolean)
public int[] getSelectedColumns()
selectionModel
is null
, returns an empty array.
getSelectedColumns
in interface TableColumnModel
selectionModel
is
null
public int getSelectedColumnCount()
getSelectedColumnCount
in interface TableColumnModel
public void addColumnModelListener(TableColumnModelListener x)
addColumnModelListener
in interface TableColumnModel
x
- a TableColumnModelListener
objectpublic void removeColumnModelListener(TableColumnModelListener x)
removeColumnModelListener
in interface TableColumnModel
x
- a TableColumnModelListener
objectpublic TableColumnModelListener[] getColumnModelListeners()
ColumnModelListener
s
or an empty
array if no column model listeners are currently registeredaddColumnModelListener(javax.swing.event.TableColumnModelListener)
,
removeColumnModelListener(javax.swing.event.TableColumnModelListener)
protected void fireColumnAdded(TableColumnModelEvent e)
e
- the event receivedEventListenerList
protected void fireColumnRemoved(TableColumnModelEvent e)
e
- the event receivedEventListenerList
protected void fireColumnMoved(TableColumnModelEvent e)
e
- the event receivedEventListenerList
protected void fireColumnSelectionChanged(ListSelectionEvent e)
e
- the event receivedEventListenerList
protected void fireColumnMarginChanged()
EventListenerList
public <T extends EventListener> T[] getListeners(Class<T> listenerType)
FooListener
s
upon this model.
FooListener
s are registered using the
addFooListener
method.
You can specify the listenerType
argument
with a class literal,
such as
FooListener.class
.
For example, you can query a
DefaultTableColumnModel
m
for its column model listeners with the following code:
ColumnModelListener[] cmls = (ColumnModelListener[])(m.getListeners(ColumnModelListener.class));If no such listeners exist, this method returns an empty array.
listenerType
- the type of listeners requested; this parameter
should specify an interface that descends from
java.util.EventListener
FooListener
s on this model,
or an empty array if no such
listeners have been added
ClassCastException
- if listenerType
doesn't specify a class or interface that implements
java.util.EventListener
getColumnModelListeners()
public void propertyChange(PropertyChangeEvent evt)
propertyChange
in interface PropertyChangeListener
evt
- PropertyChangeEvent
public void valueChanged(ListSelectionEvent e)
ListSelectionListener
that forwards
ListSelectionEvents
when there is a column
selection change.
valueChanged
in interface ListSelectionListener
e
- the change eventprotected ListSelectionModel createSelectionModel()
protected void recalcWidthCache()
totalColumnWidth
property.
|
JavaTM 2 Platform Standard Ed. 5.0 |
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| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
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--- layout: default title: "Page not found" permalink: 404.html ---
The page you are looking for was not found at this location.


Click on the link below to confirm your account, and you're good to go!
${siteUrl}?activation=${user.activationCode}


Brand logo in the header
Limited time sale for 24 hours on vegetables
Welcome to Healthy Living
Check out our recipes
Featured Editorial Posts
An Apple a Day Keeps the Dentist Away
It turns out, an Apple has natural teeth-cleaning properties that keep your teeth whiter. The fibrous parts of the apple act as a natural floss when you bite down on it, and it doesn’t cause any bleeding! You should naturally still brush twice a day (and floss), but Apples will give you that teeth-cleaning boost.
Can’t you C How Rich Orange is in Vitamins?
In the Medieval Era, pirates and sailors that would travel in the ocean for long stretches of time would often get scurvy because of a lack of Vitamin C. Oranges are packed in this Vitamin that help you prevent the common cold and other illnesses.
Blueberries - The Real Superfood
Full of antioxidants, if there was a fruit that really kept the doctor away, it would be blueberries. They have a wide variety of vitamins in them, along with other nutrients essential for keeping your body functioning well. Add these to yogurt or a bowl of cereal to mix in some delicious flavor into your breakfast.


glacier precipitation temperature glaciers MBS mass data summer change ref. (Fig. TECs {border-style air climate px;} sensitivity #ffffff;} annual TEC high using Karakoram calculated balance grid mass-balance changes Fig. area different ratio Glacier climatic overlapping trends elevation explanatory optimized spatial variability Asian ELA ICESat Kääb Nature S). \documentclass[pt]{minimal} \setlength{\oddsidemargin}{-pt} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amsmath} \usepackage{amssymb} \usepackage{mathrsfs} \usepackage{upgreek} \usepackage{wasysym} obtained px; {font-family (MBS) APHRODITE Gardner Himalayas West change. covering font-size heat ice median precipitation, radiation reanalysis regression values Asia Figure GAMDAM HMA MBS, Shan areas average correlation determination difference distribution double; inventory mean regions relatively seasonal shortwave snow studies temperatures used ./tc--- Climate Commons Creative Cryosphere HMA, However, Kunlun RGI. Tibetan accumulation analysis and/or based border-color border-width calculate coefficient compared dataset error errors estimate expressed glaciers. global large lower negative observed obtain point relationship respectively. response shows solid; temperature, {font-style {font-weight (see ... ./ngeo Berthier ERA-Interim Earth Fujita Furthermore, Geosci. Glaciol. Mapping Supplementary Version aggregated analysed balances bold cell courier; datasets domain em; evaluate heterogeneous higher images indicate line line. material paper pt;} ratios recent region responses similar slightly spatially square tend variations warming water winter


This demo illustrates how to play two looped sounds and mix between them using WebAudioXML - an XML based language to implement interactive audio into a web page.
Open the audio.xml file to se the audio configuration.
The connections from HTML to let the buttons and slider control WebAudioXML is using the data-waxml attributes:
AB


Hi 👋 I’m Zack Khan, and I’m looking for a new opportunity as a product manager
Directed Bitcamp, the largest hackathon on the east coast. Key metrics: 1300+ attendees, raised $200,000, implemented new programs for entrepreneurs and designers and branding campaign for new "Mark Your Trail" theme
Created and taught a for-credit course on Reinforcement Learning (CMSC389F) within the UMD Computer Science department. I created course content, lecture weekly, and graded weekly problem sets and projects.
Startup Shell is a student-run incubator of $40M+ in collective value. As Director of Community for Shell, I organize events and initiatives for members of our diverse community of entrepreneurs
Handshake's mission is to democratize opportunity, allowing all students to have equal access to jobs. As a growth engineer, I helped develop a referrals program that incentivized students to refer each other to join Handshake.
As an organizer of Technica, the world's largest all-women hackathon, I learned after speaking with previous attendees that many users were not familiar with Slack, our main medium for mentorship. In response, I created a feature within our mobile app that allows attendees to ask questions via an easy-to-use form. The backend server then posts the question to Slack, through which a team of mentors can claim and meet the attendees in-person to answer their question (React Native, Node JS)
Loneliness is a huge issue, especially on a large campus like UMD. I created an app to pair people for meals at diners, so no one has to eat alone if they don't want to. (React Native)
Created an AR scavenger hunt game (3rd place, PennApps),
a smart gun (Winner, HackUVA),
a holographic virtual assistant (3rd place, a16z Battle of the Hacks),
and a VR drawing experience for Phillips Collection museum in DC
Currently working on a paper that proposes a domain-specific approach to question generation, incorporating knowledge about a given domain to generate more relevant questions. Project draft can be found here.
Developed Kodactive, a platform for teaching students Computer Science using programmable toys. We gave workshops to local schools and won 3rd place at Maryland Do Good Challenge, 2nd place at UMD Fishbowl Entrepreneurship Competition.


Tooltip Custom Element supports 12 built-in position modes: "top, bottom, left, right, top-left, bottom-left, top-right, bottom-right, absolute, mouse, mouseenter, default".
In this demo, the tooltip for the first movie will be displayed from its 'left' side.
The tooltip for the second movie will be displayed below the picture and the tooltip for the third movie will be displayed on its 'right' side.


Ask yourself, how much am I willing to invest right now.
You can’t be planning to buy land in Lekki when the money in your account is calling you to Ikorodu.
Decide your reason for investing. Are you investing for cashflow or huge capital gains in the future?
When you understand this, it will determine what you will invest in.
If you have decided to invest for capital gains, then you might decide to buy land in developing areas with potential for appreciation; somewhere like Ibeju-Lekki.
If you are investing for cashflow, then you might want to buy an apartment and put it up for rent.
You get the point?
: Once you have decided what you want to invest in, you now have to decide on location.
If you’re looking to buy land for capital gains, then you should be looking at areas that obviously have potential for appreciation.
If you’re looking to invest for rental cash flow for instance, then you should be looking to invest in an area that has high rental value.
The importance of this cannot be over emphasized.
You want to make sure you are buying from the right source, a major part of buying from the right source is conducting proper due diligence before making a commitment.
I hope this helps you.
Tag someone who can learn from this and please share.
Courtesy: PacificRim Global +234<PHONE_NUMBER>
Good morning and have a blessed day 🙏🙏
Check out the Jekyll docs for more info on how to get the most out of Jekyll. File all bugs/feature requests at Jekyll’s GitHub repo. If you have questions, you can ask them on Jekyll’s dedicated Help repository.


@( idRequest: services.IdentityRequest, idUrlBuilder: services.IdentityUrlBuilder, returnUrl: String )(implicit request: RequestHeader) @import common.LinkTo
You can change your preferences anytime by signing in to your account and visiting Email Preferences.


Explore The World
Forest Hideaway
Bountiful Mountainscapes
Winter Wonderland
Nature Walk
Bush Sunset
Sheltered Lake Retreat


Delegate for the SDLChoiceSet. Contains methods that get called when an action is taken on a choice cell.
Delegate method called after a choice set item is selected
- (void)choiceSet:(nonnull SDLChoiceSet *)choiceSet
didSelectChoice:(nonnull SDLChoiceCell *)choice
withSource:(nonnull SDLTriggerSource)source
atRowIndex:(NSUInteger)rowIndex;
func choiceSet(_ choiceSet: SDLChoiceSet, didSelectChoice choice: SDLChoiceCell, withSource source: SDLTriggerSource, atRowIndex rowIndex: UInt)
The choice set displayed
The item selected
The trigger source
The row of the selected choice
Delegate method called on an error
- (void)choiceSet:(nonnull SDLChoiceSet *)choiceSet
didReceiveError:(nonnull NSError *)error;
func choiceSet(_ choiceSet: SDLChoiceSet, didReceiveError error: Error)
The choice set
The error


Before Change
// apply sequence labeling to the whole file
t, left, right = next(self.from_file(current_file))
y = np.sqrt(np.sum((left - right) ** 2, axis=-1))
window = SlidingWindow(duration=2 * self.duration,
step=self.step, start=0.)
return SlidingWindowFeature(y, window)
After Change
predictions : SlidingWindowFeature
warnings.warn("Segmentation.apply is probably broken")
// apply sequence labeling to the whole file
y = []
for t_batch, left_batch, right_batch in self.from_file(current_file):


The following is a small incomplete concept. keep in mind this may be incomplete for a while. Any input on this project would be greatly appreciated. If you wish to help go here and apply: Achieve R&D I also plan to modify this concept as this project continues. EMI (An Efficient Mod Importer) Section 1 Think of all the possible ways that a mod can be installed. i.e. through manual download through modboy other alternatives Different ways a mod is packaged i.e. In a folder in a zip to where a mod would be unzipped then extracted from the folder then put into the mods folder In a zip Just to where the mod would be unzipped and put into the mods folder. How to mark the file and make it to where the program can distinguish between the original and the mod i.e. Compare the mod file to the original maybe through the file size if there is a noticalbe difference in byte or preferably kb or comparing the images themselves to see if the look the same or not or the creation date between the mod and the original file Section 2 a way to make the user take less steps to install a mod i.e. Find the installation folder then after that the user just drags the zip files into the program and the user has options like to replace overlapping mods or backup the save. The user also has the option to set up the program to automatically backup/replace allow the user to have complete discretion when using the program.
Back


checkr
is a dependency-free, pipe-friendly R package of expressive, assertive functions to check the properties of common R objects.
In the case of failure the functions, which are designed to be used in scripts and packages, issue informative error messages.
For a comparison with similar packages see the assertive-programming
vignette.
The following code demonstrates the check_data()
function
library(checkr)
# the starwars data frame in the dplyr package fails many of these checks
check_data(dplyr::starwars, values = list(
height = c(66L, 264L),
name = "",
mass = c(20,1358, NA),
hair_color = c("blond", "brown", "black", NA),
gender = c("male", "female", "hermaphrodite", "none", NA)),
order = TRUE, nrow = c(81, 84), key = "hair_color", error = FALSE)
#> Warning: dplyr::starwars column names must include 'height', 'name',
#> 'mass', 'hair_color' and 'gender' in that order
#> Warning: column height of dplyr::starwars must not include missing values
#> Warning: the values in column mass of dplyr::starwars must lie between 20
#> and 1358
#> Warning: column hair_color of dplyr::starwars can only include values
#> 'black', 'blond' or 'brown'
#> Warning: dplyr::starwars must not have more than 84 rows
#> Warning: column 'hair_color' in dplyr::starwars must be a unique key
The two other main functions are check_vector()
and check_list()
.
y <- c(2,1,0,1,NA)
check_vector(y, values = 1:10, length = 2, unique = TRUE, sorted = TRUE, named = TRUE, error = FALSE)
#> Warning: y must have 2 elements
#> Warning: y must be class integer
#> Warning: y must not include missing values
#> Warning: y has unpermitted values 0
#> Warning: y must be unique
#> Warning: y must be sorted
#> Warning: y must be named
The most interesting and unique feature of checkr
is the use of objects to check the values of other objects using an elegant and expressive syntax.
To check that a vector does not include missing values pass a single non-missing value (of the correct class).
To allow it to include missing values include a missing value.
And to check that it only includes missing values only pass a missing value (of the correct class)
To check the range of a vector pass two non-missing values (as well as the missing value if required).
To check the vector only includes specific values pass three or more non-missing values.
To install the latest official release from CRAN
install.packages("checkr")
To install the latest development version from GitHub
# install.packages("devtools")
devtools::install_github("poissonconsulting/checkr")
To install the latest development version from the Poisson drat repository
# install.packages("drat")
drat::addRepo("poissonconsulting")
install.packages("checkr")
To cite package 'checkr' in publications use:
Joe Thorley (2018). checkr: Check the Properties of Common R
Objects. R package version <IP_ADDRESS>02.
https://github.com/poissonconsulting/checkr
A BibTeX entry for LaTeX users is
@Manual{,
title = {checkr: Check the Properties of Common R Objects},
author = {Joe Thorley},
year = {2018},
note = {R package version <IP_ADDRESS>02},
url = {https://github.com/poissonconsulting/checkr},
}
Please report any issues.
Pull requests are always welcome.
Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.


See what you're owed, by whom and for what reason, along with any payments that have been made; think of it as a bank statement for your debts.
| Date | Debtor | Reference | Amount |
|---|---|---|---|
Looks like you're not owed any money yet!
First, search for a debtor to assign a debt to. If the user is not already a member of DebtTracker, you can add them and we will invite them for you.
Add a new debtor and we will invite them to DebtTracker for you and let them know they owe you money!


Nishmitha Shetty
Objective
To work in an environment which encourages me to succeed and grow professionally where i can utilize my skills and knowledge appropriately.
Skills
Certificate
-Coursera
-Coursera
Interests
playing vollyball , club Membership , Traveling , Music
Education
Project
This project aimed at booking bus tickets through online mode. This project was done by using MySQL and Java.
Jewel Kart project is basically used to build an application program which help people to find and buy latest design of jewellery through online mode.
This Project is basically a procedure of making desired pizza and then delivering it to a specific location to the customer.


The Android Go-powered Lenovo Tab M7 now available in the US for just $60
by Damien WildeGood Android tablets are getting harder and harder to find, with Samsung being one of the few manufacturers to actually continue offering anything close to a high-end experience. However, the Lenovo Tab M7 offers you the lightweight Android Go in a tablet form for just $59.99.
After being announced a few months back, it’s really neat that the Tab M7 is actually $30 cheaper than initially touted. Don’t go in expecting powerful specifications; the Lenovo Tab M7 is aimed at those looking for a secondary screen for Netflix and YouTube binges, or for those wanting a screen to pacify young children.
As for the internals, the 7-inch Tab M7 comes with a 1.3 GHz quad-core MediaTek MT8321, 1 GB of RAM, and 16 GB of internal storage — but you can expand this with a microSD card up to 2 TB. You also get a rear-facing 2-megapixel camera and 2-megapixel front-facing camera.
That display isn’t the highest resolution with a pretty grainy 1024 x 600-pixel display that reaches a maximum brightness of 350 nits. Unfortunately, there is only mono audio provided by a solo front-facing speaker. Like most affordable smartphones and tablets, you get a headphone port for wired audio.
Software on the Lenovo Tab M7 comes in the Android Pie Go Edition flavor, which should mean acceptable performance but likely no real gaming performance to speak of. Although shipping with Android Pie at this stage of 2019 is disappointing, the similarly priced Amazon Fire Tablet still ships with Android Nougat, making this quite the jump.
If you’re interested in picking up the Tab M7, you can get it direct from Lenovo for $59.99 shipped right now.
More on Lenovo:
- Google gives several Lenovo Chromebooks a new lease on life w/ extended updates
- Lenovo has two new Android tablets w/ Google Assistant ‘Ambient Mode’ from $119
- Lenovo Smart Display 7 competes w/ Google’s Nest Hub at $129, adds a camera
FTC: We use income earning auto affiliate links. More.


Guetzli encoder in JavaScript, using guetzli compiled with Emscripten.
Github repository: https://github.com/dominikhlbg/Guetzli.js - WebAssembly Version: wasmDemo.html
Develop by Dominik Homberger


This 4-star hotel is 4 km from Tashkent International Airport. It offers free Wi-Fi and a buffet breakfast, served in an elegant setting. Hayot Hotel also features an indoor pool and a spa.
Address: Str. Munis 80, Tashkent 100080. Telephone: 8 71 290 05 05
The hotel is always happy to welcome guests with warm east hospitality and high-quality European service. We postorayusya do everything that you would forever remember staying in our hotel. The rooms in our hotel will satisfy the needs of everyone who has stayed here, whether it be a business trip or a tourist tour.
Address: Mirzamaxmud Musaxanov Street Tashkent.Telephone: 8 71 113 11 11
For more than half a century, Lotte City Hotel Tashkent Palace has pleased its guests with the high level of services provided, the modern interior of its cozy rooms, as well as the unique location in the heart of our capital, convenient for both tourists and business people.
Address: 56 Buyuk Turon ko 'chasi, Toshkent 100029. Telephone: 8 71 120 58 00
"Grand Tashkent Hotel" is a hotel in the center of the capital of Uzbekistan in Tashkent. The hotel is next to the railway station (five minutes walk) and a bus stop (200 meters). The international airport is provided with a shuttle service (5 minutes drive).
Address: 57 Abdulla Kaxxar 6-tor ko'chasi, Toshkent. Telephone: 8 71 255 05 99
The five-star hotel "Wyndham Tashkent" is located in the center of Tashkent.  Free Wi-Fi is available in all rooms.
Address: 7/8 Amir Temur ko'chasi, Krasnogorsk 100000.Phone: 8 71 120 37 00


Green Turtle Cay is a good hurricane shelter with Black Sound being the best option.
Black Sound has a boatyard and 4 small marinas/docking facilities.
White Sound has two fair sized marinas (Bluff House and Green Turtle Club).
To get into the sounds is a bit tricky and certainly getting into Black Sound should best be done at HW. There are mooring balls available in both Black and White Sounds as holding is poor.
New Plymouth has no marina or yacht dockage, just a good anchorage that offers protection from Easterly Winds. There are several reasonable stores in the main street, for hardware and food.
Position 26° 45'40"N, 77° 19'41"W (New Plymouth harbour)
Review main Bahamas Clearance information.
If clearing in, then New Plymouth has to be visited first. Customs and Immigration are open from Monday to Friday, but are often closed. Anchor out and dinghy in to clear. The lady officer in charge lives in the first house further down on the same street. She prefers it if you arrive to deal with formalities first thing in the morning (rather than later in the morning). Expect a telling off if you arrive just before lunch!
Last updated January 2013.
Anchoring off New Plymouth town is in sand and grass and you can get as close to town as your draft allows, it shallows very gradually. Take the dinghy to the wooden town pier where you can leave it without having to worry about it.
Both Black Sound and White Sound provide good sheltered berths. Deep draft boats however need to use the anchorage off New Plymouth.
Last updated June 2014.


D U K E
Duke was my dog when I was about 15 until I was almost 18. I do not remember how we got him, but he made a mark in my family's life. He was a Scottish Terrier or so I learned. I really didn't care much about that, all I care is that I loved him very much.
Written by Shapeous


Hi! My name is Carbón, friends call me "Carbi". I was born in the land of the Maya, southern Mexico. While living on the street in my home town I met Zofi; as soon as our eyes met it was love at first sight. She took me to her home and I met Steven. We started hanging out and the next thing I know we were all living together. That was one happy day!
I love to swim in the river, chase birds and go for bike runs... yet I have not been able to do any of these for one year now. I had an accident on the last day of May 2014 and my femur got fractured into multiple pieces. No doctors in our town wanted to fix my leg so my Humans brought me to the best doctor in our state of Chiapas, Mexico. I got operated on five times already but my leg still hurts and recently when they took the metal fixation out, the bone was too weak and it broke again. I was so sad because I thought soon I could be running just like I did before.
My Humans are now thinking about what to do and where to find a good clinic with experienced doctors. They mentioned something about going to the United States. They say it is very far away, a place I don't know yet... but Steven is from there and he would take care of me. Good that I learned some English with my Humans because they say it will be very useful there. I just want to walk and run again. I will follow them anywhere.
| Day | Date | Notes |
|---|---|---|
| Day | Date | Notes |


9.15. redis安装和常用类型¶
9.15.1. redis安装¶
[root@centos-151 ~]# yum install redis
[root@centos-151 ~]# rpm -ql redis
/etc/logrotate.d/redis # 日志滚动的
/etc/redis-sentinel.conf # 高可用相关配置
/etc/redis.conf # redis主配置文件
/etc/systemd/system/redis-sentinel.service.d
/etc/systemd/system/redis-sentinel.service.d/limit.conf
/etc/systemd/system/redis.service.d
/etc/systemd/system/redis.service.d/limit.conf
/usr/bin/redis-benchmark
/usr/bin/redis-check-aof # 检查aof
/usr/bin/redis-check-rdb # 检查快照文件
/usr/bin/redis-cli # 命令终端
/usr/bin/redis-sentinel
/usr/bin/redis-server
/usr/lib/systemd/system/redis-sentinel.service
/usr/lib/systemd/system/redis.service
/usr/libexec/redis-shutdown
/usr/share/doc/redis-3.2.10
/usr/share/doc/redis-3.2.10/00-RELEASENOTES
/usr/share/doc/redis-3.2.10/BUGS
/usr/share/doc/redis-3.2.10/CONTRIBUTING
/usr/share/doc/redis-3.2.10/MANIFESTO
/usr/share/doc/redis-3.2.10/README.md
/usr/share/licenses/redis-3.2.10
/usr/share/licenses/redis-3.2.10/COPYING
/usr/share/man/man1/redis-benchmark.1.gz
/usr/share/man/man1/redis-check-aof.1.gz
/usr/share/man/man1/redis-check-rdb.1.gz
/usr/share/man/man1/redis-cli.1.gz
/usr/share/man/man1/redis-sentinel.1.gz
/usr/share/man/man1/redis-server.1.gz
/usr/share/man/man5/redis-sentinel.conf.5.gz
/usr/share/man/man5/redis.conf.5.gz
/var/lib/redis # redis数据库文件位置
/var/log/redis # redis日志文件位置
/var/run/redis
9.15.2. redis-cli使用¶
[root@centos-151 ~]# systemctl restart redis
[root@centos-151 ~]# redis-cli
<IP_ADDRESS>:6379> help
redis-cli 3.2.10
To get help about Redis commands type:
"help @<group>" to get a list of commands in <group>
"help <command>" for help on <command>
"help <tab>" to get a list of possible help topics
"quit" to exit
To set redis-cli perferences:
":set hints" enable online hints
":set nohints" disable online hints
Set your preferences in ~/.redisclirc
Note
redis-cli的只能提示是非常完美的。
9.15.3. redis常用数据类型¶
<IP_ADDRESS>. string类型¶
<IP_ADDRESS>:6379> help @string
APPEND key value
summary: Append a value to a key # 给特定key追加一个值
since: 2.0.0
BITCOUNT key [start end]
summary: Count set bits in a string # 字符串的bits个数
since: 2.6.0
BITFIELD key [GET type offset] [SET type offset value] [INCRBY type offset increment] [OVERFLOW WRAP|SAT|FAIL]
summary: Perform arbitrary bitfield integer operations on strings
since: 3.2.0
BITOP operation destkey key [key ...]
summary: Perform bitwise operations between strings #2个字符串之间指定操作运算
since: 2.6.0
BITPOS key bit [start] [end]
summary: Find first bit set or clear in a string # 查找位置
since: 2.8.7
DECR key
summary: Decrement the integer value of a key by one # 减少值
since: 1.0.0
DECRBY key decrement
summary: Decrement the integer value of a key by the given number # 减少特定值
since: 1.0.0
GET key
summary: Get the value of a key # 获取特定的key对应值
since: 1.0.0
GETBIT key offset
summary: Returns the bit value at offset in the string value stored at key #
since: 2.2.0
GETRANGE key start end
summary: Get a substring of the string stored at a key #
since: 2.4.0
GETSET key value
summary: Set the string value of a key and return its old value
since: 1.0.0
INCR key
summary: Increment the integer value of a key by one
since: 1.0.0
INCRBY key increment
summary: Increment the integer value of a key by the given amount
since: 1.0.0
INCRBYFLOAT key increment
summary: Increment the float value of a key by the given amount
since: 2.6.0
MGET key [key ...]
summary: Get the values of all the given keys
since: 1.0.0
MSET key value [key value ...]
summary: Set multiple keys to multiple values
since: 1.0.1
MSETNX key value [key value ...]
summary: Set multiple keys to multiple values, only if none of the keys exist
since: 1.0.1
PSETEX key milliseconds value
summary: Set the value and expiration in milliseconds of a key
since: 2.6.0
SET key value [EX seconds] [PX milliseconds] [NX|XX]
summary: Set the string value of a key
since: 1.0.0
SETBIT key offset value
summary: Sets or clears the bit at offset in the string value stored at key
since: 2.2.0
SETEX key seconds value
summary: Set the value and expiration of a key
since: 2.0.0
SETNX key value
summary: Set the value of a key, only if the key does not exist
since: 1.0.0
SETRANGE key offset value
summary: Overwrite part of a string at key starting at the specified offset
since: 2.2.0
STRLEN key
summary: Get the length of the value stored in a key
since: 2.2.0
<IP_ADDRESS>. list类型¶
<IP_ADDRESS>:6379> help @list
BLPOP key [key ...] timeout
summary: Remove and get the first element in a list, or block until one is available
since: 2.0.0
BRPOP key [key ...] timeout
summary: Remove and get the last element in a list, or block until one is available
since: 2.0.0
BRPOPLPUSH source destination timeout
summary: Pop a value from a list, push it to another list and return it; or block until one is available
since: 2.2.0
LINDEX key index
summary: Get an element from a list by its index
since: 1.0.0
LINSERT key BEFORE|AFTER pivot value
summary: Insert an element before or after another element in a list
since: 2.2.0
LLEN key
summary: Get the length of a list
since: 1.0.0
LPOP key
summary: Remove and get the first element in a list
since: 1.0.0
LPUSH key value [value ...]
summary: Prepend one or multiple values to a list
since: 1.0.0
LPUSHX key value
summary: Prepend a value to a list, only if the list exists
since: 2.2.0
LRANGE key start stop
summary: Get a range of elements from a list
since: 1.0.0
LREM key count value
summary: Remove elements from a list
since: 1.0.0
LSET key index value
summary: Set the value of an element in a list by its index
since: 1.0.0
LTRIM key start stop
summary: Trim a list to the specified range
since: 1.0.0
RPOP key
summary: Remove and get the last element in a list
since: 1.0.0
RPOPLPUSH source destination
summary: Remove the last element in a list, prepend it to another list and return it
since: 1.2.0
RPUSH key value [value ...]
summary: Append one or multiple values to a list
since: 1.0.0
RPUSHX key value
summary: Append a value to a list, only if the list exists
since: 2.2.0
<IP_ADDRESS>. generic类型¶
<IP_ADDRESS>:6379> help @generic
DEL key [key ...]
summary: Delete a key
since: 1.0.0
DUMP key
summary: Return a serialized version of the value stored at the specified key.
since: 2.6.0
EXISTS key [key ...]
summary: Determine if a key exists
since: 1.0.0
EXPIRE key seconds
summary: Set a key's time to live in seconds
since: 1.0.0
EXPIREAT key timestamp
summary: Set the expiration for a key as a UNIX timestamp
since: 1.2.0
KEYS pattern
summary: Find all keys matching the given pattern
since: 1.0.0
MIGRATE host port key| destination-db timeout [COPY] [REPLACE] [KEYS key]
summary: Atomically transfer a key from a Redis instance to another one.
since: 2.6.0
MOVE key db
summary: Move a key to another database
since: 1.0.0
OBJECT subcommand [arguments [arguments ...]]
summary: Inspect the internals of Redis objects
since: 2.2.3
PERSIST key
summary: Remove the expiration from a key
since: 2.2.0
PEXPIRE key milliseconds
summary: Set a key's time to live in milliseconds
since: 2.6.0
PEXPIREAT key milliseconds-timestamp
summary: Set the expiration for a key as a UNIX timestamp specified in milliseconds
since: 2.6.0
PTTL key
summary: Get the time to live for a key in milliseconds
since: 2.6.0
RANDOMKEY -
summary: Return a random key from the keyspace
since: 1.0.0
RENAME key newkey
summary: Rename a key
since: 1.0.0
RENAMENX key newkey
summary: Rename a key, only if the new key does not exist
since: 1.0.0
RESTORE key ttl serialized-value [REPLACE]
summary: Create a key using the provided serialized value, previously obtained using DUMP.
since: 2.6.0
SCAN cursor [MATCH pattern] [COUNT count]
summary: Incrementally iterate the keys space
since: 2.8.0
SORT key [BY pattern] [LIMIT offset count] [GET pattern [GET pattern ...]] [ASC|DESC] [ALPHA] [STORE destination]
summary: Sort the elements in a list, set or sorted set
since: 1.0.0
TTL key
summary: Get the time to live for a key
since: 1.0.0
TYPE key
summary: Determine the type stored at key
since: 1.0.0
WAIT numslaves timeout
summary: Wait for the synchronous replication of all the write commands sent in the context of the current connection
since: 3.0.0
PFSELFTEST arg
summary: Help not available
since: not known
HOST: arg ...options...
summary: Help not available
since: not known
GEORADIUSBYMEMBER_RO key arg arg arg arg ...options...
summary: Help not available
since: not known
REPLCONF arg ...options...
summary: Help not available
since: not known
ASKING arg
summary: Help not available
since: not known
PSYNC arg arg arg
summary: Help not available
since: not known
RESTORE-ASKING key arg arg arg ...options...
summary: Help not available
since: not known
LATENCY arg arg ...options...
summary: Help not available
since: not known
GEORADIUS_RO key arg arg arg arg arg ...options...
summary: Help not available
since: not known
TOUCH key arg ...options...
summary: Help not available
since: not known
POST arg ...options...
summary: Help not available
since: not known
SUBSTR key arg arg arg
summary: Help not available
since: not known
PFDEBUG arg arg arg ...options...
summary: Help not available
since: not known
<IP_ADDRESS>. generic类型¶
<IP_ADDRESS>:6379> help @hash
HDEL key field [field ...]
summary: Delete one or more hash fields
since: 2.0.0
HEXISTS key field
summary: Determine if a hash field exists
since: 2.0.0
HGET key field
summary: Get the value of a hash field
since: 2.0.0
HGETALL key
summary: Get all the fields and values in a hash
since: 2.0.0
HINCRBY key field increment
summary: Increment the integer value of a hash field by the given number
since: 2.0.0
HINCRBYFLOAT key field increment
summary: Increment the float value of a hash field by the given amount
since: 2.6.0
HKEYS key
summary: Get all the fields in a hash
since: 2.0.0
HLEN key
summary: Get the number of fields in a hash
since: 2.0.0
HMGET key field [field ...]
summary: Get the values of all the given hash fields
since: 2.0.0
HMSET key field value [field value ...]
summary: Set multiple hash fields to multiple values
since: 2.0.0
HSCAN key cursor [MATCH pattern] [COUNT count]
summary: Incrementally iterate hash fields and associated values
since: 2.8.0
HSET key field value
summary: Set the string value of a hash field
since: 2.0.0
HSETNX key field value
summary: Set the value of a hash field, only if the field does not exist
since: 2.0.0
HSTRLEN key field
summary: Get the length of the value of a hash field
since: 3.2.0
HVALS key
summary: Get all the values in a hash
since: 2.0.0
<IP_ADDRESS>. sorted_set类型¶
<IP_ADDRESS>:6379> help @sorted_set
ZADD key [NX|XX] [CH] [INCR] score member [score member ...]
summary: Add one or more members to a sorted set, or update its score if it already exists
since: 1.2.0
ZCARD key
summary: Get the number of members in a sorted set
since: 1.2.0
ZCOUNT key min max
summary: Count the members in a sorted set with scores within the given values
since: 2.0.0
ZINCRBY key increment member
summary: Increment the score of a member in a sorted set
since: 1.2.0
ZINTERSTORE destination numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX]
summary: Intersect multiple sorted sets and store the resulting sorted set in a new key
since: 2.0.0
ZLEXCOUNT key min max
summary: Count the number of members in a sorted set between a given lexicographical range
since: 2.8.9
ZRANGE key start stop [WITHSCORES]
summary: Return a range of members in a sorted set, by index
since: 1.2.0
ZRANGEBYLEX key min max [LIMIT offset count]
summary: Return a range of members in a sorted set, by lexicographical range
since: 2.8.9
ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count]
summary: Return a range of members in a sorted set, by score
since: 1.0.5
ZRANK key member
summary: Determine the index of a member in a sorted set
since: 2.0.0
ZREM key member [member ...]
summary: Remove one or more members from a sorted set
since: 1.2.0
ZREMRANGEBYLEX key min max
summary: Remove all members in a sorted set between the given lexicographical range
since: 2.8.9
ZREMRANGEBYRANK key start stop
summary: Remove all members in a sorted set within the given indexes
since: 2.0.0
ZREMRANGEBYSCORE key min max
summary: Remove all members in a sorted set within the given scores
since: 1.2.0
ZREVRANGE key start stop [WITHSCORES]
summary: Return a range of members in a sorted set, by index, with scores ordered from high to low
since: 1.2.0
ZREVRANGEBYLEX key max min [LIMIT offset count]
summary: Return a range of members in a sorted set, by lexicographical range, ordered from higher to lower strings.
since: 2.8.9
ZREVRANGEBYSCORE key max min [WITHSCORES] [LIMIT offset count]
summary: Return a range of members in a sorted set, by score, with scores ordered from high to low
since: 2.2.0
ZREVRANK key member
summary: Determine the index of a member in a sorted set, with scores ordered from high to low
since: 2.0.0
ZSCAN key cursor [MATCH pattern] [COUNT count]
summary: Incrementally iterate sorted sets elements and associated scores
since: 2.8.0
ZSCORE key member
summary: Get the score associated with the given member in a sorted set
since: 1.2.0
ZUNIONSTORE destination numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX]
summary: Add multiple sorted sets and store the resulting sorted set in a new key
since: 2.0.0
<IP_ADDRESS>. set类型¶
<IP_ADDRESS>:6379> help @set
SADD key member [member ...]
summary: Add one or more members to a set
since: 1.0.0
SCARD key
summary: Get the number of members in a set
since: 1.0.0
SDIFF key [key ...]
summary: Subtract multiple sets
since: 1.0.0
SDIFFSTORE destination key [key ...]
summary: Subtract multiple sets and store the resulting set in a key
since: 1.0.0
SINTER key [key ...]
summary: Intersect multiple sets
since: 1.0.0
SINTERSTORE destination key [key ...]
summary: Intersect multiple sets and store the resulting set in a key
since: 1.0.0
SISMEMBER key member
summary: Determine if a given value is a member of a set
since: 1.0.0
SMEMBERS key
summary: Get all the members in a set
since: 1.0.0
SMOVE source destination member
summary: Move a member from one set to another
since: 1.0.0
SPOP key [count]
summary: Remove and return one or multiple random members from a set
since: 1.0.0
SRANDMEMBER key [count]
summary: Get one or multiple random members from a set
since: 1.0.0
SREM key member [member ...]
summary: Remove one or more members from a set
since: 1.0.0
SSCAN key cursor [MATCH pattern] [COUNT count]
summary: Incrementally iterate Set elements
since: 2.8.0
SUNION key [key ...]
summary: Add multiple sets
since: 1.0.0
SUNIONSTORE destination key [key ...]
summary: Add multiple sets and store the resulting set in a key
since: 1.0.0
<IP_ADDRESS>. pubsub类型¶
<IP_ADDRESS>:6379> help @pubsub
PSUBSCRIBE pattern [pattern ...]
summary: Listen for messages published to channels matching the given patterns
since: 2.0.0
PUBLISH channel message
summary: Post a message to a channel
since: 2.0.0
PUBSUB subcommand [argument [argument ...]]
summary: Inspect the state of the Pub/Sub subsystem
since: 2.8.0
PUNSUBSCRIBE [pattern [pattern ...]]
summary: Stop listening for messages posted to channels matching the given patterns
since: 2.0.0
SUBSCRIBE channel [channel ...]
summary: Listen for messages published to the given channels
since: 2.0.0
UNSUBSCRIBE [channel [channel ...]]
summary: Stop listening for messages posted to the given channels
since: 2.0.0


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Detailed Description
Note: This API is part of the nano layer
The nano layer supplies a set of memory management functions. pico]OS functions are thread save, thus pico]OS can replace the memory allocation functions of a runtime library that was not designed for a multitasking environment.
Function Documentation
| NANOEXT void* POSCALL nosMemAlloc |
( |
UINT_t |
size | ) |
|
Allocate memory from the heap. This function allocates a block of memory from the heap. The function is thread save, thus multiple threads can access the heap without corrupting it.
- Parameters:
-
| size | in bytes of the memory block to allocate. |
- Returns:
- The function returns the pointer to the new memory block on success. NULL is returned when the function failed to allocate a block with the wished size.
- Note:
- NOSCFG_FEATURE_MEMALLOC must be defined to 1 to have this function compiled in.
- See also:
- nosMemRealloc, nosMemFree, NOSCFG_MEM_MANAGER_TYPE
| NANOEXT void POSCALL nosMemCopy |
( |
void * |
dst, |
|
|
void * |
src, |
|
|
UINT_t |
count |
|
) |
| |
Copy a block of memory. This function works like the memcpy function from the C runtime library.
- Parameters:
-
| dst | pointer to the destination memory block |
| src | pointer to the source memory block |
| count | number of bytes to copy |
- Note:
- NOSCFG_FEATURE_MEMCOPY must be defined to 1 to have this function compiled in.
- See also:
- nosMemAlloc, nosMemSet
| NANOEXT void POSCALL nosMemFree |
( |
void * |
p | ) |
|
| NANOEXT void POSCALL* nosMemRealloc |
( |
void * |
memblock, |
|
|
UINT_t |
size |
|
) |
| |
Reallocate a block of memory. Sometimes it is necessary to increase or decrease the size of a memory block on the heap. This function works like the usual realloc(), it is optimized to keep the heap clean and unfragmented.
- Parameters:
-
| memblock | pointer to the memory block on the heap. |
| size | new size of the memory block (larger or smaller) |
- Returns:
- The function returns the pointer to the new memory block on success. NULL is returned when the function failed to change the size of the block.
- Note:
- NOSCFG_FEATURE_MEMALLOC and NOSCFG_FEATURE_REALLOC must be defined to 1 to have this function compiled in.
-
nosMemRealloc reaches the best performance only when NOSCFG_MEM_MANAGE_MODE is set to 1
- See also:
- nosMemAlloc, nosMemFree, NOSCFG_MEM_MANAGER_TYPE
| NANOEXT void POSCALL nosMemSet |
( |
void * |
buf, |
|
|
char |
val, |
|
|
UINT_t |
count |
|
) |
| |
Fill a block of memory with a special character. This function works like the memset function from the C runtime library.
- Parameters:
-
| buf | pointer to the destination memory block |
| val | character to fill into the memory block |
| count | number of bytes to fill into the block |
- Note:
- NOSCFG_FEATURE_MEMSET must be defined to 1 to have this function compiled in.
- See also:
- nosMemAlloc, nosMemCopy


Customize your pizza and place your order.
Pick your toppings ($1 each)
Pepperoni
Sausage
Bacon
Green Peppers
Black Olives
Onions
Pineapple
Canadian Bacon
Anchovies
Pick your size
Small ($10)
Medium ($14)
Large ($18)
Extra Large ($22)
Preview your pizza
Pizzas being made:
Click a pizza to cancel the order.


This led me to suggest that the NULL value is a member of every type, and a NULL check is required on every use of that reference variable, and it may be perhaps a billion dollar mistake. 1 – Tony Hoare
What’s wrong with NULL
Simply put, NULL reference (or NULL pointer) is a special marker and keyword indicating that something has no value.Programs routinely use NULL pointers to represent conditions such as the end of a list of unknown length or the failure to perform some action; this use of NULL pointers can be compared to NULLable types and to the Nothing value in an option type.It is created by Tony Hoare, a famous British computer scientist.
Simply because it was so easy to implement, many computer language designers use NULL reference. Speaking at a software conference in 2009, Tony Hoare apologized for inventing the NULL reference2
So, what problems does NULL reference cause?
- In these languges, etc Java, NULL is above type checks. It slips through them silently, waiting for runtime, to finally burst free in a shower of errors.
1
2
String s = null;
s.toUppercase(); // compile check success, but crashes at runtime.
- Null make Ambiguous API.
1
2
3
4
5
6
7
8
// name => phone number
Map<String, String> store = new HashMap<>();
store.put("adam", "911");
store.put("Bill", null)
store.get("Adam"); // 911 represent Adam's phone number is 911
store.get("Bill"); // null represent Bill don't have a phone number
store.get("Cathy");// null represent ?
- NULL is difficult to debug.We do not need say more about it.
…3
NullPointerException in Java
NullPointerException
NullPointerException
is an unchecked exception and extendsRuntimeException
. Anull
value can be assigned to an object reference in Java.
NullPointerException
is thrown when program attempts to use an object reference that has the null value.
These can be:
- Invoking a method from a
null
object. - Accessing or modifying a
null
object’s field. - Taking the length of
null
, as if it were an array. - Accessing or modifying the slots of
null
object, as if it were an array. - Throwing
null
, as if it were a Throwable value. - When you try to synchronize over a
null
object.
Example:
1
2
3
4
5
6
7
// define a String of value null
String a = null
// a is null, does hava a equals method
if (a.equals("OK")) {
...
}
Output:
Exception in thread "main" java.lang.NullPointerException
at Example.main(Example.java:4)
How to avoid NPE
Since Java was created, programmers spent a lot of precious time handling NPE(NullPointerException), which is not some difficult problem.So, let’s look at specific ways to solve these problems.
Check method arguments
1
2
3
void doSomething(String s) {
... // some operations
}
Look at the method doSomething()
.
Suppose s
is a null reference, these operations invoke the member methods of argument s
,
it will throws a NPE.
To avoid this NPE, we can modify the code as below.
1
2
3
4
5
6
void doSomething(String s) {
if (s == null) {
return;
}
... // some operations
}
@NotNull
But if we check arguments in each of methods, we may repeat the check operations in different place.So, how do we remind the caller that some arguments can not be null?
Java provides a annotation @NotNull
, let us look at how to use it properly.
1
2
3
void doSomething(@NotNull String s) {
... // some operations
}
As the annotation @NotNull
annotated the argument s
, developers would pay attention to the variable to the method whether is null.
Objects
Java 7 provides util type Objects
in java.util
package to help developers process on objects.These utilities include null-safe or null-tolerant methods for computing the hash code of an object, returning a string for an object, and comparing two objects.
1
2
3
4
String a = null;
String b = "YES";
a.equals(b); // NullPointerException
1
2
3
4
int[] a = null;
int[] b = new int[] {1, 2, 3, 4, 5};
a.equals(b); // NullPointerException
1
2
3
4
String a = null;
String b = "YES";
Objects.equals(a, b); // false
1
2
3
4
int[] a = null;
int[] b = new int[] {1, 2, 3, 4, 5};
a.equals(b); // NullPointerException
Optional
Java 8 has introduced a new class Optional
in java.util
package.It can help in writing a neat code without using too many null checks.
Static Method Summary
| Modifier and Type | Method and Description |
|---|---|
| static |
empty() Returns an empty Optional instance. |
| static |
of(T value) Returns an Optional with the specified present non-null value. |
| static |
ofNullable(T value) Returns an Optional describing the specified value, if non-null, otherwise returns an empty Optional. |
We can create a Optional
instance by invoking methods in the table above.
ofNullable()
method can accept a null reference.
Instance Method Summary
| Modifier and Type | Method and Description |
|---|---|
| boolean | equals(Object obj) Indicates whether some other object is “equal to” this Optional. |
| Optional<T> | filter(Predicate<? super T> predicate) If a value is present, and the value matches the given predicate, return an Optional describing the value, otherwise return an empty Optional. |
| <U> Optional <U> | flatMap(Function<? super T, Optional<U>> mapper) If a value is present, apply the provided Optional-bearing mapping function to it, return that result, otherwise return an empty Optional. |
| T | get() If a value is present in this Optional, returns the value, otherwise throws NoSuchElementException. |
| int | hashCode() Returns the hash code value of the present value, if any, or 0 (zero) if no value is present. |
| void | ifPresent(Consumer<? super T> consumer) If a value is present, invoke the specified consumer with the value, otherwise do nothing. |
| boolean | isPresent() Return true if there is a value present, otherwise false. |
| <U> Optional <U> | map(Function<? super T, ? extends U> mapper) If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. |
| T | orElse(T other) Return the value if present, otherwise return other. |
| T | orElseGet(Supplier<? extends T> other) Return the value if present, otherwise invoke other and return the result of that invocation. |
| <X extends Throwable> T | orElseThrow(Supplier<? extends X> exceptionSupplier) Return the contained value, if present, otherwise throw an exception to be created by the provided supplier. |
But if you have to write code like this,
1
2
3
4
5
6
7
8
9
10
11
String getUsername(Long id) {
if (Objects.isNull(id)) {
return null;
}
User user = userDao.get(id);
if (Objects.isNull(user)) {
return null;
}
String name = user.getName();
return name;
}
1
2
3
4
5
6
String getUsername(Long id) {
return Optional.ofNullable(id)
.map(id -> userDao.get(id))
.map(User::getName)
.orElse(null);
}
Suppose there is a 1-to-many relationship between Campaign and Order. If we use traditional method, check whether variables is null, to implement the feature as below;
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
List<Order> findOrdersByCampaignId (Long id) {
if (Objects.isNull(id)) {
return Collections.emptyList();
}
List<CampaignOrderRel> rels =
campaignOrderRelDao.findByCampaignId(id);
if (Objects.isNull(rels) || rels.isEmpty()) {
return Collections.emptyList();
}
List<Long> orderIds = rels.stream()
.map(CampaignOrderRel::getOrder)
.map(Order::getId)
.collect(Collectors.toList());
if (Objects.isNull(orderIds)) || orderIds.isEmpty()) {
return Collections.emptyList();
}
return orderDao.findByIds(orderIds);
}
But if we use Optional
,
1
2
3
4
5
6
7
8
9
10
11
List<Order> findOrdersByCampaignId (Long id) {
return Optional.ofNullable(id)
.map(campaignOrderRelDao::findByCampaignId)
.filter(rels -> !rels.isEmpty())
.map(rels -> rels.stream()
.map(CampaignOrderRel::getOrder)
.map(Order::getId)
.collect(Collectors.toList()))
.map(orderDao::findByIds)
.orElseGet(Collections::emptyList);
}
By using Optional, we can specify alternate values to return or alternate code to run. This makes the code more readable because the facts which were hidden are now visible to the developer.
Helpful NullPointerExceptions
While chained statements are nice to look at in the code, they are not NPE friendly. A single statement spread over several lines will give you the line number of the first line in the stack trace regardless of where it occurs.4
These kind of chained statement will print only “NullPointerException occurred in line number xyz”. It really is hard to debug such code.
We’ll take a look at how JDK 14 and later version, through JEP 358, will solve this issue.
Most importantly, the detailed exception message is switched off by default in JDK 14, on by default in the later version. To enable it, we need to use the command-line option:
When we enable the feature, the exception message prints the local variable name:
Exception in thread "main" java.lang.NullPointerException: Cannot invoke "String.toUpperCase()" because the return value of "java.util.Map.get(Object)" is null
at com.jsprx.jdk15.HelpfulNullPointerException.main(HelpfulNullPointerException.java:12)


Infection control in five acute hospitals being affected by overcrowding
by By Digital Desk staffInfection control and prevention in five acute hospitals is being affected by overcrowding.
A new report from Hiqa shows the issue is also being impacted by old and unsuitable infrastructure.
Five hospital inspections were carried out between April and June.
Of the five, maintenance and infrastructural deficits in three hospitals had not been addressed since the last inspection.
Those hospitals were Croom in Limerick, Nenagh Hospital and Sligo University Hospital.
It says Croom and Nenagh also had no one designated as the lead or coordinator for decontamination.
However Hiqa does say all five hospitals have leadership, governance and management arrangements for infection prevention and controls were in place.


Welcome to the the final chapter of the "Implementing a language with LLVM" tutorial.  :)
It is interesting to see how far we've come, and how little code it has taken. We built the entire lexer, parser, AST, code generator, and an interactive run-loop (with a JIT!) by-hand in under 540 lines of (non-comment/non-blank) code.
Our little language supports a couple of interesting features: it supports user defined binary and unary operators, it uses JIT compilation for immediate evaluation, and it supports a few control flow constructs with SSA construction.
Part of the idea of this tutorial was to show you how easy and fun it can be to define, build, and play with languages. Building a compiler need not be a scary or mystical process! Now that you've seen some of the basics, I strongly encourage you to take the code and hack on it.  Building a language like everyone else always has, is much less fun than trying something a little crazy or off the wall and seeing how it turns out. If you get stuck or want to talk about it, feel free to email the llvmdev mailing list: it has lots of people who are interested in languages and are often willing to help out.
Before we end this tutorial, I want to talk about some "tips and tricks" for generating LLVM IR. These are some of the more subtle things that may not be obvious, but are very useful if you want to take advantage of LLVM's capabilities.
We have a couple common questions about code in the LLVM IR form - let's just get these out of the way right now, shall we?
Kaleidoscope is an example of a "portable language": any program written in Kaleidoscope will work the same way on any target that it runs on. Many other languages have this property, e.g. LISP, Java, Haskell, Javascript, Python, etc. (note that while these languages are portable, not all their libraries are).
One nice aspect of LLVM is that it is often capable of preserving target independence in the IR: you can take the LLVM IR for a Kaleidoscope-compiled program and run it on any target that LLVM supports, even emitting C code and compiling that on targets that LLVM doesn't support natively. You can trivially tell that the Kaleidoscope compiler generates target-independent code because it never queries for any target-specific information when generating code.
The fact that LLVM provides a compact, target-independent, representation for code gets a lot of people excited. Unfortunately, these people are usually thinking about C or a language from the C family when they are asking questions about language portability. I say "unfortunately", because there is really no way to make (fully general) C code portable, other than shipping the source code around (and of course, C source code is not actually portable in general either - ever port a really old application from 32- to 64-bits?).
The problem with C (again, in its full generality) is that it is heavily laden with target specific assumptions. As one simple example, the preprocessor often destructively removes target-independence from the code when it processes the input text:
#ifdef __i386__ int X = 1; #else int X = 42; #endif
While it is possible to engineer more and more complex solutions to problems like this, it cannot be solved in full generality in a way that is better than shipping the actual source code.
That said, there are interesting subsets of C that can be made portable. If you are willing to fix primitive types to a fixed size (say int = 32-bits, and long = 64-bits), don't care about ABI compatibility with existing binaries, and are willing to give up some other minor features, you can have portable code. This can make sense for specialized domains such as an in-kernel language.
Many of the languages above are also "safe" languages: it is impossible for a program written in Java to corrupt its address space and crash the process (assuming the JVM has no bugs). Safety is an interesting property that requires a combination of language design, runtime support, and often operating system support.
It is certainly possible to implement a safe language in LLVM, but LLVM IR does not itself guarantee safety. The LLVM IR allows unsafe pointer casts, use after free bugs, buffer over-runs, and a variety of other problems. Safety needs to be implemented as a layer on top of LLVM and, conveniently, several groups have investigated this. Ask on the llvmdev mailing list if you are interested in more details.
One thing about LLVM that turns off many people is that it does not solve all the world's problems in one system (sorry 'world hunger', someone else will have to solve you some other day). One specific complaint is that people perceive LLVM as being incapable of performing high-level language-specific optimization: LLVM "loses too much information".
Unfortunately, this is really not the place to give you a full and unified version of "Chris Lattner's theory of compiler design". Instead, I'll make a few observations:
First, you're right that LLVM does lose information. For example, as of this writing, there is no way to distinguish in the LLVM IR whether an SSA-value came from a C "int" or a C "long" on an ILP32 machine (other than debug info). Both get compiled down to an 'i32' value and the information about what it came from is lost. The more general issue here, is that the LLVM type system uses "structural equivalence" instead of "name equivalence". Another place this surprises people is if you have two types in a high-level language that have the same structure (e.g. two different structs that have a single int field): these types will compile down into a single LLVM type and it will be impossible to tell what it came from.
Second, while LLVM does lose information, LLVM is not a fixed target: we continue to enhance and improve it in many different ways. In addition to adding new features (LLVM did not always support exceptions or debug info), we also extend the IR to capture important information for optimization (e.g. whether an argument is sign or zero extended, information about pointers aliasing, etc). Many of the enhancements are user-driven: people want LLVM to include some specific feature, so they go ahead and extend it.
Third, it is possible and easy to add language-specific optimizations, and you have a number of choices in how to do it. As one trivial example, it is easy to add language-specific optimization passes that "know" things about code compiled for a language. In the case of the C family, there is an optimization pass that "knows" about the standard C library functions. If you call "exit(0)" in main(), it knows that it is safe to optimize that into "return 0;" because C specifies what the 'exit' function does.
In addition to simple library knowledge, it is possible to embed a variety of other language-specific information into the LLVM IR. If you have a specific need and run into a wall, please bring the topic up on the llvmdev list. At the very worst, you can always treat LLVM as if it were a "dumb code generator" and implement the high-level optimizations you desire in your front-end, on the language-specific AST.
There is a variety of useful tips and tricks that you come to know after working on/with LLVM that aren't obvious at first glance. Instead of letting everyone rediscover them, this section talks about some of these issues.
One interesting thing that comes up, if you are trying to keep the code generated by your compiler "target independent", is that you often need to know the size of some LLVM type or the offset of some field in an llvm structure. For example, you might need to pass the size of a type into a function that allocates memory.
Unfortunately, this can vary widely across targets: for example the width of a pointer is trivially target-specific. However, there is a clever way to use the getelementptr instruction that allows you to compute this in a portable way.
Some languages want to explicitly manage their stack frames, often so that they are garbage collected or to allow easy implementation of closures. There are often better ways to implement these features than explicit stack frames, but LLVM does support them, if you want. It requires your front-end to convert the code into Continuation Passing Style and the use of tail calls (which LLVM also supports).


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Issue 6523
: JSD2: Show Stack Trace With Errors
Steps to reproduce
Open Firebug
Enable the Console and Script panel
Check
Show Stack Trace with Errors
option
Click the test button
Execute
There should be one error log in the Console panel:
Error: b
Expand it and check the stack trace. It should be:
b(age=12, name="test") d(age=12, name="test") onExecuteTest2() onExecuteTest/frame.onload()


- Returns
- array
◆ getProcessorId()
Gets the ID of the processor.
- Returns
- string
◆ getSubscriberId()
Gets the subscriber ID.
- Returns
- string
◆ getTransactionId()
Gets the transaction ID.
- Returns
- string
◆ getUpgradeRecordId()
Gets the ID of the upgrade record changed.
- Returns
- integer
◆ initCallbackHandling()
| initCallbackHandling |
( |
Zend_Controller_Request_Http |
$request | ) |
|
Initializes handling for processing a request callback.
- Parameters
-
| Zend_Controller_Request_Http | $request | |
◆ log()
| log |
( |
|
$type, |
|
|
|
$message, |
|
|
array |
$extra |
|
) |
| |
Logs the request.
- Parameters
-
| string | $type | Log type (info, payment, cancel, error) |
| string | $message | Log message |
| array | $extra | Extra details to log (not including output from getLogDetails) |
◆ processTransaction()
Once all conditions are validated, process the transaction.
- Returns
- array [0] => log type (payment, cancel, info), [1] => log message
◆ validatePreConditions()
| validatePreConditions |
( |
& |
$errorString | ) |
|
Validates pre-conditions on the callback. These represent things that likely wouldn't get fixed (and generally shouldn't happen), so retries are not necessary.
- Parameters
-
- Returns
- boolean
◆ validateRequest()
| validateRequest |
( |
& |
$errorString | ) |
|
Validates the callback request is valid. If failure happens, the response should tell the processor to retry.
- Parameters
-
| string | $errorString | Output error string |
- Returns
- boolean
The documentation for this class was generated from the following file:
- C:/Users/Michel/Desktop/test/xf/library/XenForo/UserUpgradeProcessor/PayPal.php


Get useful suggestions on your Hadoop clusters' data distribution.
Click on the below buttons for more suggestions and useful URLs.
| Total Capacity | |
| Diskspace Consumed on Cluster | |
| Diskspace Consumed Percentage on Cluster | |
| Diskspace Consumed in Last 24H | |
| Diskspace Consumed Percent Growth in Last 24H | |
| Number of Files on Cluster | |
| Total Files Percentage on Cluster | |
| Average Diskspace Consumed per File on Cluster | |
| Number of Directories on Cluster | |
| Total Directories Percentage on Cluster | |
| Average Diskspace Consumed per Directory on Cluster | |
| Last Delegation Token Issue Date on Cluster | |
[Explain] |
|---|
| Number of Empty Files | |
| Empty File Percentage on Cluster | |
| Number of Empty Files Created in Last 24H | |
| Empty File Percent Growth in Last 24H | |
| Number of Empty Files Last Accessed in Over 1YR | |
| Empty File Last Accessed in Over 1YR Percent Growth | |
| Memory Used by Empty Files | |
| Memory Used by Empty Files in Last 24H | |
[Explain] |
|---|
| Number of Empty Directories | |
| Empty Directories Percentage on Cluster | |
| Number of Empty Directories Created in Last 24H | |
| Empty Directories Percent Growth in Last 24H | |
| Number of Empty Directories over 1YR Old | |
| Empty Directories over 1YR Old Percent Growth | |
| Memory Used by Empty Directories | |
| Memory Used by Empty Directories in Last 24H | |
[Explain] |
|---|
| Number of Tiny Files | |
| Tiny Files Percentage on Cluster | |
| Number of Tiny Files Created in Last 24H | |
| Tiny Files Percent Growth in Last 24H | |
| Number of Tiny Files Last Accessed in Over 1YR | |
| Tiny Files Last Accessed in Over 1YR Percent Growth | |
| Memory Used by Tiny Files | |
| Memory Used by Tiny Files in Last 24H | |
| Diskspace Used by Tiny Files | |
| Diskspace Used by Tiny Files in Last 24H | |
[Explain] |
|---|
| Number of Small Files | |
| Small Files Percentage on Cluster | |
| Number of Small Files Created in Last 24H | |
| Small Files Percent Growth in Last 24H | |
| Number of Small Files Last Accessed in Over 1YR | |
| Small Files Last Accessed in Over 1YR Percent Growth | |
| Memory Used by Small Files | |
| Memory Used by Small Files in Last 24H | |
| Diskspace Used by Small Files | |
| Diskspace Used by Small Files in Last 24H | |
[Explain] |
|---|
| Number of Medium Files | |
| Medium Files Percentage on Cluster | |
[Explain] |
|---|
| Number of Large Files | |
| Large Files Percentage on Cluster | |
[Explain] |
|---|
| Number of Files Older than 1 Yr | |
| Files Older than 1 Yr Percentage on Cluster | |
| Number of Files Older than 2 Yrs | |
| Files Older than 2 Yrs Percentage on Cluster | |
| Diskspace Used by Files Older than 1 Yr | |
| Diskspace Used by Files Older than 2 Yrs | |
[Explain] |
|---|
| Directories with Diskspace Quotas | |
| Directories over 85% Used Diskspace Quota | |
| Directories with Namespace Quotas | |
| Directories over 85% Used Namespace Quota | |
[Explain] |
|---|


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