| Package | Description |
|---|---|
| org.apache.hadoop.io |
Generic i/o code for use when reading and writing data to the network,
to databases, and to files.
|
| org.apache.hadoop.mapred | |
| org.apache.hadoop.mapred.join | |
| org.apache.hadoop.mapred.lib.aggregate | |
| org.apache.hadoop.mapreduce | |
| org.apache.hadoop.mapreduce.lib.aggregate | |
| org.apache.hadoop.mapreduce.lib.join | |
| org.apache.hadoop.mapreduce.lib.output | |
| org.apache.hadoop.record |
(DEPRECATED) Hadoop record I/O contains classes and a record description language
translator for simplifying serialization and deserialization of records in a
language-neutral manner.
|
| Modifier and Type | Class and Description |
|---|---|
class |
SortedMapWritable<K extends WritableComparable<? super K>>
A Writable SortedMap.
|
| Modifier and Type | Class and Description |
|---|---|
class |
BooleanWritable
A WritableComparable for booleans.
|
class |
BytesWritable
A byte sequence that is usable as a key or value.
|
class |
ByteWritable
A WritableComparable for a single byte.
|
class |
DoubleWritable
Writable for Double values.
|
class |
FloatWritable
A WritableComparable for floats.
|
class |
IntWritable
A WritableComparable for ints.
|
class |
LongWritable
A WritableComparable for longs.
|
class |
MD5Hash
A Writable for MD5 hash values.
|
class |
NullWritable
Singleton Writable with no data.
|
class |
ShortWritable
A WritableComparable for shorts.
|
class |
Text
This class stores text using standard UTF8 encoding.
|
class |
VIntWritable
A WritableComparable for integer values stored in variable-length format.
|
class |
VLongWritable
A WritableComparable for longs in a variable-length format.
|
| Modifier and Type | Method and Description |
|---|---|
WritableComparable |
WritableComparator.newKey()
Construct a new
WritableComparable instance. |
| Modifier and Type | Method and Description |
|---|---|
Class<? extends WritableComparable> |
WritableComparator.getKeyClass()
Returns the WritableComparable implementation class.
|
| Modifier and Type | Method and Description |
|---|---|
int |
WritableComparator.compare(WritableComparable a,
WritableComparable b)
Compare two WritableComparables.
|
int |
WritableComparator.compare(WritableComparable a,
WritableComparable b)
Compare two WritableComparables.
|
| Modifier and Type | Method and Description |
|---|---|
static WritableComparator |
WritableComparator.get(Class<? extends WritableComparable> c)
For backwards compatibility.
|
static WritableComparator |
WritableComparator.get(Class<? extends WritableComparable> c,
Configuration conf)
Get a comparator for a
WritableComparable implementation. |
| Constructor and Description |
|---|
WritableComparator(Class<? extends WritableComparable> keyClass)
Construct for a
WritableComparable implementation. |
WritableComparator(Class<? extends WritableComparable> keyClass,
boolean createInstances) |
WritableComparator(Class<? extends WritableComparable> keyClass,
Configuration conf,
boolean createInstances) |
| Modifier and Type | Method and Description |
|---|---|
static <K extends WritableComparable,V extends Writable> |
MapFileOutputFormat.getEntry(org.apache.hadoop.io.MapFile.Reader[] readers,
Partitioner<K,V> partitioner,
K key,
V value)
Get an entry from output generated by this class.
|
| Modifier and Type | Method and Description |
|---|---|
RecordWriter<WritableComparable,Writable> |
MapFileOutputFormat.getRecordWriter(FileSystem ignored,
JobConf job,
String name,
Progressable progress) |
static Class<? extends WritableComparable> |
SequenceFileAsBinaryOutputFormat.getSequenceFileOutputKeyClass(JobConf conf)
Get the key class for the
SequenceFile |
| Modifier and Type | Interface and Description |
|---|---|
interface |
ComposableInputFormat<K extends WritableComparable,V extends Writable>
Refinement of InputFormat requiring implementors to provide
ComposableRecordReader instead of RecordReader.
|
interface |
ComposableRecordReader<K extends WritableComparable,V extends Writable>
Additional operations required of a RecordReader to participate in a join.
|
class |
CompositeInputFormat<K extends WritableComparable>
An InputFormat capable of performing joins over a set of data sources sorted
and partitioned the same way.
|
class |
CompositeRecordReader<K extends WritableComparable,V extends Writable,X extends Writable>
A RecordReader that can effect joins of RecordReaders sharing a common key
type and partitioning.
|
class |
InnerJoinRecordReader<K extends WritableComparable>
Full inner join.
|
class |
JoinRecordReader<K extends WritableComparable>
Base class for Composite joins returning Tuples of arbitrary Writables.
|
class |
MultiFilterRecordReader<K extends WritableComparable,V extends Writable>
Base class for Composite join returning values derived from multiple
sources, but generally not tuples.
|
class |
OuterJoinRecordReader<K extends WritableComparable>
Full outer join.
|
class |
OverrideRecordReader<K extends WritableComparable,V extends Writable>
Prefer the "rightmost" data source for this key.
|
class |
WrappedRecordReader<K extends WritableComparable,U extends Writable>
Proxy class for a RecordReader participating in the join framework.
|
| Modifier and Type | Class and Description |
|---|---|
class |
ValueAggregatorCombiner<K1 extends WritableComparable,V1 extends Writable>
This class implements the generic combiner of Aggregate.
|
class |
ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable>
This abstract class implements some common functionalities of the
the generic mapper, reducer and combiner classes of Aggregate.
|
class |
ValueAggregatorMapper<K1 extends WritableComparable,V1 extends Writable>
This class implements the generic mapper of Aggregate.
|
class |
ValueAggregatorReducer<K1 extends WritableComparable,V1 extends Writable>
This class implements the generic reducer of Aggregate.
|
| Modifier and Type | Class and Description |
|---|---|
class |
ID
A general identifier, which internally stores the id
as an integer.
|
class |
JobID
JobID represents the immutable and unique identifier for
the job.
|
class |
TaskAttemptID
TaskAttemptID represents the immutable and unique identifier for
a task attempt.
|
class |
TaskID
TaskID represents the immutable and unique identifier for
a Map or Reduce Task.
|
| Modifier and Type | Class and Description |
|---|---|
class |
ValueAggregatorCombiner<K1 extends WritableComparable<?>,V1 extends Writable>
This class implements the generic combiner of Aggregate.
|
class |
ValueAggregatorJobBase<K1 extends WritableComparable<?>,V1 extends Writable>
This abstract class implements some common functionalities of the
the generic mapper, reducer and combiner classes of Aggregate.
|
class |
ValueAggregatorMapper<K1 extends WritableComparable<?>,V1 extends Writable>
This class implements the generic mapper of Aggregate.
|
class |
ValueAggregatorReducer<K1 extends WritableComparable<?>,V1 extends Writable>
This class implements the generic reducer of Aggregate.
|
| Modifier and Type | Class and Description |
|---|---|
class |
ComposableInputFormat<K extends WritableComparable<?>,V extends Writable>
Refinement of InputFormat requiring implementors to provide
ComposableRecordReader instead of RecordReader.
|
class |
ComposableRecordReader<K extends WritableComparable<?>,V extends Writable>
Additional operations required of a RecordReader to participate in a join.
|
class |
CompositeInputFormat<K extends WritableComparable>
An InputFormat capable of performing joins over a set of data sources sorted
and partitioned the same way.
|
class |
CompositeRecordReader<K extends WritableComparable<?>,V extends Writable,X extends Writable>
A RecordReader that can effect joins of RecordReaders sharing a common key
type and partitioning.
|
class |
InnerJoinRecordReader<K extends WritableComparable<?>>
Full inner join.
|
class |
JoinRecordReader<K extends WritableComparable<?>>
Base class for Composite joins returning Tuples of arbitrary Writables.
|
class |
MultiFilterRecordReader<K extends WritableComparable<?>,V extends Writable>
Base class for Composite join returning values derived from multiple
sources, but generally not tuples.
|
class |
OuterJoinRecordReader<K extends WritableComparable<?>>
Full outer join.
|
class |
OverrideRecordReader<K extends WritableComparable<?>,V extends Writable>
Prefer the "rightmost" data source for this key.
|
class |
WrappedRecordReader<K extends WritableComparable<?>,U extends Writable>
Proxy class for a RecordReader participating in the join framework.
|
| Modifier and Type | Field and Description |
|---|---|
protected K |
CompositeRecordReader.key |
| Modifier and Type | Field and Description |
|---|---|
protected Class<? extends WritableComparable> |
CompositeRecordReader.keyclass |
| Modifier and Type | Method and Description |
|---|---|
static <K extends WritableComparable<?>,V extends Writable> |
MapFileOutputFormat.getEntry(org.apache.hadoop.io.MapFile.Reader[] readers,
Partitioner<K,V> partitioner,
K key,
V value)
Get an entry from output generated by this class.
|
| Modifier and Type | Method and Description |
|---|---|
RecordWriter<WritableComparable<?>,Writable> |
MapFileOutputFormat.getRecordWriter(TaskAttemptContext context) |
static Class<? extends WritableComparable> |
SequenceFileAsBinaryOutputFormat.getSequenceFileOutputKeyClass(JobContext job)
Get the key class for the
SequenceFile |
| Modifier and Type | Class and Description |
|---|---|
class |
Record
Deprecated.
Replaced by Avro.
|
| Constructor and Description |
|---|
RecordComparator(Class<? extends WritableComparable> recordClass)
Deprecated.
Construct a raw
Record comparison implementation. |
Copyright © 2018 Apache Software Foundation. All rights reserved.


Main Page
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io.cpp
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Technical Leader:
Sept, 2016 - actually
In charge of directing and providing web development services and implementations of cloud-based architectures for e-commerce:
Tools use:
Sept, 2016 - Dic 2018
Web developer. Development and deployment of applications for internal operations: list of prospects, customers, suppliers, operations, purchase orders and quotes. Connection to APIS of electronic invoicing.
Sept, 2013 - Jun, 2016
Web developer. Digital editor. Programming in HTML, CSS, Javascript, PHP MySQL and Drupal 6~7.
Jan, 2012 - Jun, 2013


Find out if and when you'll be able to use the most hyped email client since Gmail.
At this rate you'll be using Mailbox . Before you: After you:


Created by Kevin Denver
A code kata is an exercise in programming which helps a programmer hone their skills through practice and repetition. The term was probably first coined by Dave Thomas, co-author of the book The Pragmatic Programmer, in a bow to the Japanese concept of kata in the martial arts.
Whether or not you'll be able to implement a solution to the problem in the given time is not that important. We'll repeat the exercise in the coming weeks and you'll hopefully see that your solution becomes better and better as time goes on.
Pair programming is a programming discipline in which two programmers work as a pair together on one workstation. One, the driver, writes code while the other, the navigator, reviews each line of code as it is typed in. The two programmers switch roles frequently.
While reviewing, the observer also considers the strategic direction of the work, coming up with ideas for improvements and likely future problems to address. This frees the driver to focus all of his or her attention on the tactical aspects of completing the current task, using the observer as a safety net and guide.


| Disk | Saves your game. | |
| Energy | Collect these to level-up your weapon. | |
| Life | Restores your health. | |
| Missile | Restores your missile ammunition. | |
| Server | Fully restores your health and ammunition. | |
| Life Capsule | Increases your maximum health. | |
| Treasure Chest | All kinds of goodies lurk inside. |
| Map System | Displays a map of the current stage. | |
| Silver Locket | Someone's pendant. | |
| Arthur's Key | A key to open a door somewhere. |


@* * Copyright (c) 2018, Salesforce.com, Inc. * All rights reserved. * SPDX-License-Identifier: BSD-3-Clause * For full license text, see the LICENSE.txt file in the repo root or https://opensource.org/licenses/BSD-3-Clause *@ @(metadata: models.Metadata)


Gets an Argument based on its name (argument name).
the name of the argument, must not be {@code null}
the Argument, {@code null} if not found.
Gets an Argument based on its index.
the index, must be positive or zero.
the Argument, {@code null} if not found.
Gets the list of defined arguments.
the list of argument, empty if none.
the CLI description.
the CLI name.
Gets the list of options.
the list of options, empty if none.
the CLI priority.
the CLI summary.
Parses the user command line interface and create a new CommandLine containing extracting values.
the arguments
the creates command line
Parses the user command line interface and create a new CommandLine containing extracting values.
the arguments
enable / disable parsing validation
the creates command line
Generated using TypeDoc
Interface defining a command-line interface (in other words a command such as 'run', 'ls'...). This interface is polyglot to ease reuse such as in Vert.x Shell.
A command line interface has a name, and defines a set of options and arguments. Options are key-value pair such as {@code -foo=bar} or {@code -flag}. The supported formats depend on the used parser. Arguments are unlike options raw values. Options are defined using Option, while argument are defined using Argument. Command line interfaces also define a summary and a description. These attributes are used in the usage generation . To disable the help generation, set the {@code hidden} attribute to {@code true}. Command Line Interface object does not contains "value", it's a model. It must be evaluated by a parser that returns a CommandLine object containing the argument and option values.Clement Escoffier<EMAIL_ADDRESS>Argument
Option


J.C.Bose University Ymca Faridabad
(A Haryana State Government University)
(Established by Harayana State Legislative Act No. 21 of 2009 & Recognised by UGC act 1956)
Accredited "A" Grade by NAAC
Facilities in Hostel:
1) Reading room, common room, Guest room, Waiting lounge, gymnasium
2) Badminton court and basket ball ground along with open spaces attached to each wing
3) Shift canteen and tuc shop
4) Induction cooktops, gysers,RO water purifiers,CCTV cameras.
5) Wi-Fi
6) Sports and Recreation facility
7) First Aid and Ambulance
6) Separate wardens for each wing,lady guards,resident attendant
| S.No | Name of Hostel | Name of Warden | Contact No. |
|---|---|---|---|
| 1 | Kalpana Chawla Hal | Dr.Sonia |<PHONE_NUMBER> |
| 2 | Mother Teresa Hall | Dr.Shejla Jain |<PHONE_NUMBER> |
| 3 | Sarojini Hall | Amrita Arora |<PHONE_NUMBER> |
| 4 | Kasturba Hall | Mrs. Sadhna |<PHONE_NUMBER> |


Deleting News Feeds
How to delete one or more news feeds from the News Feeds (RSS) module.
- Select Edit > Edit Newsfeeds from the module actions menu..
- Click the Edit button beside the feed to be deleted.
- Click the Delete button at the base of the page. This displays the message "Do you really want to delete the selected RSS feed?"
-
Click the OK button to confirm.
- Repeat Steps 2-4 to delete additional feeds.
- Click the Return button to return to the page.


ENGG
1000
PSYC
2252
MATH
1221
EDUC
1205
Your Library Items
Architecture in Rome
loan -
Due by 12/12/2014
Your Library Items
Architecture in Rome
loan -
Due by 12/12/2014
Page 2
Page 3
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Mascherano set for Estudiantes move
by BeSoccerJavier Mascherano will play his club football in Argentina for the first time in 14 years after agreeing to join Estudiantes.
Former Barcelona and Argentina star Javier Mascherano has agreed to join Primera Division side Estudiantes.
The 35-year-old left Barcelona at the end of the 2017-18 season to sign a deal with Chinese Super League outfit Hebei China Fortune. He has made 53 appearances for the club over the past two seasons but will now make a return to Argentina 14 years after leaving River Plate for Brazilian side Corinthians.
Estudiantes announced the deal on social media alongside a video of president and former Seleccion team-mate Juan Sebastian Veron dining with Mascherano.
Featured links
- Mourinho replaces Pochettino at Tottenham
- The latest football transfers news and rumours
- Wales, golf, Madrid... in that order
- Luis Enrique returns to Spain national team
"We have travelled 19,000km to welcome Javier to the Pincha family," the club wrote on Twitter. "Estudiantes is your home, Mascherano."
Mascherano retired from international duty after the 2018 World Cup, having amassed a national record 147 caps. Estudiantes are seventh in the Primera Division after picking up 22 points from their opening 13 games.


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m =
answer
elastic potential energy and kinetic energy
answer
The kinetic energy and velocity are highest when the spring energy is lowest, at the point of equilibrium. (The dotted line)
answer
The total energy is always the same for the same mass and spring constant.
With an actual spring system the energy would eventually change forms into thermal energy, but this simulation doesn't include heat loss.
Conservation of Energy
Energy is conserved. This means it can't be reduced or increased, but as systems change, the energy changes form. Since total energy is always the same value, we can build an equation that sets the total energy at one time equal to the total energy at any other time.
$$K_i + U_i = K_f + U_f$$
\( K \) = kinetic energy [J]\( U \) = potential energy [J]
This equation is bare bones right now. We need to change it for each situation. We should only include energy types that are changed. For now we can calculate three types of energy.
For now we will assume no thermal energy loss, but we will explore it in the next section, thermodynamics.
solution
This equation only needs to include kinetic and gravitational potential energy.
$$K_i + U_i = K_f + U_f$$Initial kinetic energy is zero because the ball starts at rest. Choosing the final height to be zero will set the final gravitational potential energy to zero.
$$U_g = K$$ $$mgh = \frac{1}{2}mv^2$$ $$gh = \frac{1}{2}v^2$$ $$\boxed{v^2 = 2gh}$$This energy equation happens to be the same as one of the equations of motion.
$$v^2 = u^2 + 2a\Delta x$$solution
The velocity is at rest initially. This means that the initial kinetic energy will be zero as well.
We can decided to make height zero at the bottom of the table. This means there is no final gravitational potential energy.
How fast is the ball going just before it hits the ground?
solution
$$K_i + U_i = K_f + U_f$$ $$0+U_g = K+0$$ $$mgh = \tfrac{1}{2}mv^{2}$$ $$gh = \tfrac{1}{2}v^{2}$$ $$(9.8 \, \mathrm{\tfrac{m}{s^2}})(0.80\,\mathrm{m}) = \tfrac{1}{2}v^{2}$$ $$15.68\, \mathrm{\tfrac{m^2}{s^2}} = v^{2}$$ $$\pm 3.959\, \mathrm{ \tfrac{m}{s} } = v$$solution
$$K = U_g$$ $$\tfrac{1}{2}mv^{2} = mgh$$ $$\tfrac{1}{2}v^{2} = gh$$ $$\tfrac{1}{2}(10)^{2} = 9.8h$$ $$50 = 9.8h$$ $$5.10 \, \mathrm{m} = h$$solution
Each path starts with the same gravitational potential energy. This energy is converted to the same kinetic energy. So, they will all have the same velocity.
solution
$$U_{g} + K_{i} = K_{f}$$ $$mgh + \tfrac{1}{2}mu^{2} = \tfrac{1}{2}mv^{2}$$ $$gh + \tfrac{1}{2}u^{2} = \tfrac{1}{2}v^{2}$$ $$(9.8)(30) + \frac{1}{2}(10)^{2} = \frac{1}{2}v^{2}$$ $$294 + 50 = \tfrac{1}{2}v^{2}$$ $$344 = \tfrac{1}{2}v^{2}$$ $$\pm 26.2 \mathrm{\tfrac{m}{s}} = v$$solution
$$413\,\mathrm{ft} \left(\frac{0.3048 \,\mathrm{m}}{1 \,\mathrm{ft}} \right) = 126 \,\mathrm{m}$$$$U_{g} = K$$ $$mgh = \tfrac{1}{2}mv^{2}$$ $$gh = \tfrac{1}{2}v^{2}$$ $$(9.8)(126) = \tfrac{1}{2}v^{2}$$ $$1230 = \tfrac{1}{2}v^{2}$$ $$\pm 49.6 \, \mathrm{\tfrac{m}{s}} = v$$
solution
Conservation of energy for gravitational and kinetic energy is independent of mass.
$$\text{point A}$$ $$E_A = mgh$$ $$\frac{E_A}{m} = gh$$ $$\frac{E_A}{m} = (9.8)(100)$$ $$\frac{E_A}{m} = 980 \, \mathrm{\tfrac{J}{kg}}$$Now we can set the energy at point A equal to the energy at points B,C,D.
$$\text{point B}$$ $$E_A = E_B$$ $$980 = gh + \tfrac{1}{2}v^2$$ $$980 = (9.8)(8) + \tfrac{1}{2}v^2$$ $$980 - 78.4 = \tfrac{1}{2}v^2$$ $$1803.2 = v^2$$ $$v = 42.5 \, \mathrm{\tfrac{m}{s}}$$Example: A ball on a 1.0 meter long string is let go at a 30° angle. Calculate the velocity at 45° and 90° as it swings back and forth.
convert angles into heights
$$h = (1.0)sin(30) = 0.5 \,\mathrm{m}$$ $$h = (1.0)sin(90) = 1\,\mathrm{m}$$ $$h = (1.0)sin(45) = 0.71\,\mathrm{m}$$solution 90°
$$K_i + U_i = K_f + U_f$$ $$U_{gi} = K +U_{gf}$$ $$mgh_i = \tfrac{1}{2}mv^2 + mgh_f$$ $$gh_i = \tfrac{1}{2}v^2 + gh_f$$ $$(9.8)(-0.5) = \tfrac{1}{2}v^2 + (9.8)(-1)$$ $$(9.8)(0.5) = \tfrac{1}{2}v^2$$ $$3.13 \, \tfrac{m}{s} = v $$solution 45°
$$K_i + U_i = K_f + U_f$$ $$U_{gi} = K +U_{gf}$$ $$mgh_i = \tfrac{1}{2}mv^2 + mgh_f$$ $$gh_i = \tfrac{1}{2}v^2 + gh_f$$ $$(9.8)(-0.5) = \tfrac{1}{2}v^2 + (9.8)(-0.71)$$ $$(9.8)(0.21) = \tfrac{1}{2}v^2$$ $$2.03 \, \tfrac{m}{s} = v $$How fast should the ball be moving right after it leaves the spring?
solution
If we define h to be zero at the spring equilibrium, then h=x.
$$U_s + U_g = K$$ $$\tfrac{1}{2}kx^{2} + mgh= \tfrac{1}{2}mv^{2}$$ $$\tfrac{1}{2}kx^{2} + mg {\color{#f05}x}= \tfrac{1}{2}mv^{2}$$ $$\tfrac{1}{2}(200)(-0.15)^{2} + (0.2)(9.8)(-0.15)= \tfrac{1}{2}(0.2)v^{2}$$ $$1.956 = 0.1v^{2}$$ $$4.42 \, \mathrm{\tfrac{m}{s}} = v$$How high will the ball go?
solution
$$K = U_g$$ $$\tfrac{1}{2}mv^{2} = mgh$$We know from the previous question that the total energy is 1.956 J.
$$1.956 = (0.20)(9.8)h$$ $$1.956 = 1.96h$$ $$1.00 \, \mathrm{m} = h$$m = kg
Example: How fast is the mass moving at the spring equilibrium (x = 0).
Use the default values.
solution
We will define h = 0 at x = 0. This makes x = h.
$$\tfrac{1}{2}mv^2 + mgh + \tfrac{1}{2}kx^2$$ $$\tfrac{1}{2}mv^2 + mg{\color{#f05}x} + \tfrac{1}{2}kx^2$$The initial energy will be when the spring and height are at equilibrium (x = 0). The final energy will be at the lowest point, when the spring is at rest (v = 0).
$$v_i = \, ? \quad x_i =0 \quad \quad \quad \quad v_f = 0 \quad x_f = -150$$ $$\tfrac{1}{2}mv^2 + mgx + \tfrac{1}{2}kx^2 = \tfrac{1}{2}mv^2 + mgx + \tfrac{1}{2}kx^2$$ $$\tfrac{1}{2}mv^2 = mgx + \tfrac{1}{2}kx^2$$ $$\tfrac{1}{2}(13)v^2 = (13)(9.8)(-150) + \tfrac{1}{2}(10)(-150)^2$$ $$6.5v^2 = -19110 + 112500$$ $$6.5v^2 = 93390$$ $$v = \pm 119.9 \tfrac{m}{s}$$Example: When the dampening is turned on, the spring system slowly settles on a single position. Write an equation to predict that position in terms of the mass and spring constant.
hint
To build the equation, solve Newton's second law for an acceleration of zero.
solution
Is this equation correct? Test it out with the simulation.
Investigation: What is the value of the spring constant?
Use Newton's second law to find the solution.
solution
We need to solve a Newton's second law equation. Add a known mass to the hook and click stop to get the velocity and acceleration to zero.
$$\sum F = ma$$ $$F_s-F_g = ma$$ $$kx-mg = 0$$ $$kx=mg$$ $$k=\frac{mg}{x}$$We can read mass and gravity directly from the simulation. We can measure the displacement with the ruler. This is easier if you check the displacement box in the top right.
$$m=0.100 \,\mathrm{kg} \quad g=9.8\,\mathrm{\tfrac{m}{s^2}} \quad x=0.17\,\mathrm{m} $$ $$k=\frac{(0.100)(9.8)}{0.17}$$ $$k=5.8 \, \mathrm{\tfrac{kg}{s^2}}$$Investigation: What is the value of the spring constant?
Use conservation of energy to find the solution.
solution
Conservation of energy requires two different moments in time. This simulation makes velocity impossible to measure, so we must choose two moments where v=0.
Point one will be at spring equilibrium. Place the 100 kg mass on the hook and let it get exactly at the point of spring equilibrium. This is easier if you check the displacement box in the top right.
Point two will be at the bottom of the springs drop. Make sure dampening is off so we don't lose energy to heat.
$$K_i + U_{gi} + U_{si} = K_f + U_{gf} + U_{sf}$$The velocity is zero at both moments. If we define height to be zero at the spring equilibrium, then both potential energies are zero at the start.
$$0 = U_g + U_s$$ $$0 = mgx + \tfrac{1}{2}kx^2$$ $$0 = mg + \tfrac{1}{2}kx$$ $$-\tfrac{1}{2}kx = mg$$ $$k=\frac{-2mg}{x}$$We can read mass and gravity directly from the simulation. We can measure the displacement with the ruler. This is easier if you check the displacement box in the top right. Also slow motion and pause help.
$$m=0.100 \,\mathrm{kg} \quad g=9.8\,\mathrm{\tfrac{m}{s^2}} \quad x=-0.34\,\mathrm{m} $$ $$k=\frac{-2(0.100)(9.8)}{-0.34}$$ $$k=5.8 \, \mathrm{\tfrac{kg}{s^2}}$$Investigation: Calculate the mass of the red and blue weights.
solution
We can just reuse our method for getting the spring constant, but for mass.
$$k=\frac{mg}{x}$$ $$m=\frac{kx}{g}$$Place each mass on the hook with dampening on high, and measure how much it displaces the spring.


News
Talks and Appearances
2013-09-02 (2 SEP)
2013-10-03 (3 OCT)
Information technology standardisation - theory and practice
by Olle Olsson
course "Law and ICT"
Stockholm, Sweden
2013-10-10 (10 OCT)
2013-10-16 (16 OCT)
Standards for Web Applications on Mobile
by Dominique Hazaël-Massieux
Venice, Italy
Events
-
2013-08-27 (27 AUG) – 2013-08-29 (29 AUG)
System Applications Working Group Meeting
Toronto, Canada
Mozilla
-
2013-09-10 (10 SEP) – 2013-09-11 (11 SEP)
-
2013-09-16 (16 SEP) – 2013-09-17 (17 SEP)
Publishing and the Open Web Platform
Paris, France
Hosted by the Institut de Recherche et d'Innovation (IRI)
-
2013-09-19 (19 SEP) – 2013-09-20 (20 SEP)
Berlin, Germany
-
2013-09-26 (26 SEP) – 2013-09-27 (27 SEP)
Aspects of Semantic Technologies
Berlin, Germany
-
2013-10-01 ( 1 OCT) – 2013-10-02 ( 2 OCT)
Lyon, France
-
2013-10-02 ( 2 OCT) – 2013-10-03 ( 3 OCT)


{% extends "base_map/base.html" %} {% block content %}
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Adding tagging support
As our blog will contain more posts, it will become more and more difficult to retrieve them. To help classify posts by subject we will add tagging support.
The Tag model object
We will add one more object to the blog model definition. The Tag
class itself is indeed very simple:
package models;
import java.util.*;
import javax.persistence.*;
import play.db.jpa.*;
@Entity
public class Tag extends Model implements Comparable<Tag> {
public String name;
private Tag(String name) {
this.name = name;
}
public String toString() {
return name;
}
public int compareTo(Tag otherTag) {
return name.compareTo(otherTag.name);
}
}
Because we want something like lazy tag creation we will always get them using the findOrCreateByName(String name)
factory method. Let’s add it to the Tag
class:
public static Tag findOrCreateByName(String name) {
Tag tag = Tag.find("byName", name).first();
if(tag == null) {
tag = new Tag(name);
}
return tag;
}
Tagging posts
Now it is time to link the new Tag
model with the Post
model. Let’s add the correct relationship to the Post
class:
…
@ManyToMany(cascade=CascadeType.PERSIST)
public Set<Tag> tags;
public Post(User author, String title, String content) {
this.comments = new ArrayList<Comment>();
this.tags = new TreeSet<Tag>();
this.author = author;
this.title = title;
this.content = content;
this.postedAt = new Date();
}
…
Note that we use a TreeSet
here in order to keep the tag list in a predictable order (alphabetical order in fact, because of our previous compareTo
implementation).
We will keep this relationship unidirectional.
We will also add a bunch of helper methods to make tag management simpler. The first one tags a Post
:
…
public Post tagItWith(String name) {
tags.add(Tag.findOrCreateByName(name));
return this;
}
…
The next one retrieves all posts with a specific tag:
…
public static List<Post> findTaggedWith(String tag) {
return Post.find(
"select distinct p from Post p join p.tags as t where t.name = ?", tag
).fetch();
}
…
It is time to write a new test case to test this stuff. Restart the server in test
mode by typing:
$ play test
Now add a new @Test
to the BasicTest
class:
@Test
public void testTags() {
// Create a new user and save it
User bob = new<EMAIL_ADDRESS>"secret", "Bob").save();
// Create a new post
Post bobPost = new Post(bob, "My first post", "Hello world").save();
Post anotherBobPost = new Post(bob, "Hop", "Hello world").save();
// Well
assertEquals(0, Post.findTaggedWith("Red").size());
// Tag it now
bobPost.tagItWith("Red").tagItWith("Blue").save();
anotherBobPost.tagItWith("Red").tagItWith("Green").save();
// Check
assertEquals(2, Post.findTaggedWith("Red").size());
assertEquals(1, Post.findTaggedWith("Blue").size());
assertEquals(1, Post.findTaggedWith("Green").size());
}
Make sure that it works.
A little more difficult now
Well, we won’t use it in our blog right now, but what if we wanted to retrieve posts tagged with several tags? It’s more difficult than it seems.
I give you the needed JPQL query because you will likely use it in several web projects:
…
public static List<Post> findTaggedWith(String... tags) {
return Post.find(
"select distinct p from Post p join p.tags as t where t.name in (:tags) group by p.id, p.author, p.title, p.content,p.postedAt having count(t.id) = :size"
).bind("tags", tags).bind("size", tags.length).fetch();
}
…
The tricky part is that we have to use a having count
statement to filter only posts that have exactly all tags from the joined view.
Note that we cannot use the Post.find("…", tags, tags.count)
signature here, because tags
is already a vararg.
You can test it by adding more checks to the previous test:
…
assertEquals(1, Post.findTaggedWith("Red", "Blue").size());
assertEquals(1, Post.findTaggedWith("Red", "Green").size());
assertEquals(0, Post.findTaggedWith("Red", "Green", "Blue").size());
assertEquals(0, Post.findTaggedWith("Green", "Blue").size());
…
The tag cloud
Where we have tags, we need a tag cloud. Let’s add a method to the Tag
class to generate the tag cloud:
public static List<Map> getCloud() {
List<Map> result = Tag.find(
"select new map(t.name as tag, count(p.id) as pound) from Post p join p.tags as t group by t.name order by t.name"
).fetch();
return result;
}
Here we use a handy Hibernate feature that allows us to return a custom object from a JPA query. This results in a List
containing a Map
for each tag with two keys: tag
for the tag name and pound
for the tag count.
Let’s test it by adding one more check to our tags test:
…
List<Map> cloud = Tag.getCloud();
assertEquals(
"[{tag=Blue, pound=1}, {tag=Green, pound=1}, {tag=Red, pound=2}]",
cloud.toString()
);
Adding tags to the Blog UI
We can now use the new tagging stuff to add one more way to browse the blog. As always, to work efficiently we need to add a bunch of test tags to our initial data set.
Modify the /yabe/conf/initial-data.yml
file to add some tags to the tests posts. For example:
…
Tag(play):
name: Play
Tag(architecture):
name: Architecture
Tag(test):
name: Test
Tag(mvc):
name: MVC
…
And then add them to the post’s declaration:
…
Post(jeffPost):
title: The MVC application
postedAt: 2009-06-06
author: jeff
tags:
- play
- architecture
- mvc
content: >
A Play
…
Add the Tags
declaration at the top of the YAML file, because they need to be created before any Post
references them.
You need to restart your application to force loading of the new initial data set. Note how Play even tells you about problems in YAML files:
Then modify the #{display /}
tag to show the tag set on the full post view. Edit the /yabe/app/views/tags/display.html
file:
…
#{if _as != 'full'}

| ${_post.comments.size() ?: 'no'}
comment${_post.comments.size().pluralize()}
#{if _post.comments}
, latest by ${_post.comments[0].author}
#{/if}

#{/if}
#{elseif _post.tags}

- Tagged
#{list items:_post.tags, as:'tag'}
${tag}${tag_isLast ? '' : ', '}
#{/list}

#{/elseif}
…
The new ‘tagged with’ page
Now we can add a new way to list blog posts by tags. In the #{display /}
tag, above, we left the link blank; we will now replace it by a link to the new listTagged
action:
…
- Tagged
#{list items:_post.tags, as:'tag'}
${tag}${tag_isLast ? '' : ', '}
#{/list}
…
Create the action method on the Application
controller:
…
public static void listTagged(String tag) {
List<Post> posts = Post.findTaggedWith(tag);
render(tag, posts);
}
…
As always we create a specific route to keep the URI clean:
GET /posts/{tag} Application.listTagged
We have a problem because we have an existing route that conflicts with this new one. These two routes will match the same URI:
GET /posts/{id} Application.show
GET /posts/{tag} Application.listTagged
However, because we’ll assume that an id
is numeric and a tag
is not, we can easily solve the situation using a regular expression to restrict the first route:
GET /posts/{<[0-9]+>id} Application.show
GET /posts/{tag} Application.listTagged
Finally, we just have to create the /yabe/app/views/Application/listTagged.html
template that will be used by the new listTagged
action:
#{extends 'main.html' /}
#{set title:'Posts tagged with ' + tag /}
*{********* Title ********* }*
#{if posts.size() > 1}

There are ${posts.size()} posts tagged '${tag}'

#{/if}
#{elseif posts}

There is 1 post tagged '${tag}'

#{/elseif}
#{else}

No post tagged '${tag}'

#{/else}
*{********* Posts list *********}*

#{list items:posts, as:'post'}
#{display post:post, as:'teaser' /}
#{/list}

-p(note). Next: A basic admin area using CRUD.


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Senior Software Engineer
- Spearheaded cross-functional engineering efforts and collaborated with stakeholders across different regions to integrate their rule-based engine into our platform, resulting in positive business metrics in three targeted markets
- Contributed to the overall cost reduction of $51,000/month (64% cost reduction). Led the engineering efforts for Redis to AWS migration and implementing log cost reduction measures
- Proactively created comprehensive metrics dashboards for Redis migration, enabling the team to efficiently handle on-call duties
- Collaborated and investigated various issues with multiple stakeholders across regions, figuring out the root cause of the problem and collaborating with the owner to address the problems with the right tradeoff
- Guided team members on the best practices of Terraform, prepared comprehensive documentation on the structure and rationale behind the Terraform code
- Swiftly diagnosed and resolved critical production issues, ensuring adherence to SLO and minimizing customer impact


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Welcome To
Wade Wilson World
Build Climber and Train Stopper
You might saw me jumping, climbing buildings, and stopping trains. But nobody pays me a dime for that work. That's why I am learning and mastering web development. I will not stop until I become the Web Development Hero.
Hire Me


First some background about myself:
I've regularly used a wide variety of drugs while in high school and college, but I have the most experience with marijuana, MDMA, LSD, and psilocybin mushrooms. I don't want to use psychedelics anymore, and I haven't for well over a year. The only drug I truly enjoy and still use when I can get it is marijuana. When I began using Adderall a month ago, it was the only drug in my system, and still is. My experience with stimulants was limited to caffeine, methylphenidate, and cocaine. Significantly, I'd never used methamphetamine. Dextroamphetamine, therefore, was completely new to me.
Dosage:
Varies according to mood and the circumstances of the day. Anywhere from 10-70mg orally; 50mg is the most common. I make sure I take a day off every few days.
The Report:
Instead of writing about what this drug feels like, I want to talk about how I avoid the unpleasant come-down. The biggest problem with using Adderall (or any other stimulant) is the long and gradual 'come-down' following the initial few hours of feeling wonderful. From my own experience I've come up with a list of things to do to reduce or eliminate the unpleasant come-down every time, thus making the entire experience of using amphetamines much more rewarding. This list seemed like a silly idea to me at first, but I decided to write it anyway because these things actually work very well! Maybe somebody out there will find it helpful.
1. I take the pills before noon. Adderall lasts an incredibly long time, and there's nothing worse than not being able to get to sleep after using it.
2. I eat food and drink water. This is really, really helpful! Of course amphetamine eliminates your appetite, so I don't feel hungry.  You don't need much; I find that a couple of bananas does the trick. It's amazing how much of the come-down is eliminated just by having some food in my body.
3. I don't do unpleasant things. If I relax and have a good time while the drug wears off, I won't notice the down at all.  I don't use the drug when I know I'm going to have to do something unpleasant later in the day.
4. I use other drugs. Alcohol, marijuana, and benzodiazepines all come in very handy when I'm trying to beat the come-down.
5. I use the drug in one big dose. Lots of little doses seem to make the down much worse.
Doing these things has made Adderall much more enjoyable for me.  Eating a little food seems to be the best way to beat the down in general.
Experience Reports are the writings and opinions of the individual authors who submit them.
Some of the activities described are dangerous and/or illegal and none are recommended by Erowid.


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This is the top paragraph of text
mainly the div tag I've been working with. Trying to get the bare bones structure of my website going.
All elements are connected to the DOM, and it constructed like a huge tree. elements can have parents, children, and siblings. Think of it like a family tree.
I have been familiar with sublime, and have been using snippets regularly. Currently I have been working on my terminal aliases for all the git commands.


--- layout: default title: Home announcements: Hello, welcome to the page. --- Whats new: {{ page.announcements }} Latest Posts {% include new_posts.html %} About Me
{{ page.announcements }}


Lisa Larsen has written another excellent article revolving around FLVs and FlashComm, this time entitled “Creating a Dynamic Playlist for Progressive Flash Video” about creating… well, look at the title.
technically, because she is not being offered any money from my family to be my friend, i am hoping that being associated with her in turn makes me look smart ( not like my so called “friend”, Punchy)
check out the article here


Interface IMetaClient
Namespace: PKWARE.Smartcrypt.MetaClient
Assembly: MetaClient.dll
Syntax
public interface IMetaClient
Properties
CryptoProvider
The ICryptoProvider that this MetaClient is using.
Declaration
[NotNull]
ICryptoProvider CryptoProvider { get; }
Property Value
| Type | Description |
|---|---|
| ICryptoProvider |
IsolatedMode
In isolated mode no network communication is allowed.
Declaration
bool IsolatedMode { get; set; }
Property Value
| Type | Description |
|---|---|
| Boolean |
Logger
Declaration
[NotNull]
Logger Logger { get; }
Property Value
| Type | Description |
|---|---|
| Logger |
Methods
ApplyContingencyGroup(String)
Data are being encrypted with a custom password. To ensure that the organization still has access to the data encrypt the password for the Contingency Association's RSA public key and store it in the JSON.
Declaration
[NotNull]
EncryptionInfo ApplyContingencyGroup([CanBeNull] string sessionKey = null)
Parameters
| Type | Name | Description |
|---|---|---|
| String | sessionKey | If |
Returns
| Type | Description |
|---|---|
| EncryptionInfo |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | With Category of CategoryUpgrade if the data are newer than understood by this software. With Category of CategoryInternal if the data are in an invalid format. |
askForAsset(String)
Requests the specified asset from the Metadata Server.
Declaration
[Obsolete("Should only be used by internal PKWARE Archive clients")]
void askForAsset(string jsonOrUrn)
Parameters
| Type | Name | Description |
|---|---|---|
| String | jsonOrUrn | Whenever possible, the full asset JSON should be provided. The JSON will include all information to correctly find an asset. If only the URN is provided, the asset may not be found. |
Remarks
If the asset is already held, this is a no-op. If the asset is homed to a different server than the user, the asset will not be fetched, and this is a no-op. If not currently online, the request will be cached and processed in the future.
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | With a Category of CategoryInternal if the json provided is in an unrecognized format. Other variations of the exception may be thrown as well. |
canCreateKey(String)
Declaration
bool canCreateKey(string kind)
Parameters
| Type | Name | Description |
|---|---|---|
| String | kind |
Returns
| Type | Description |
|---|---|
| Boolean |
CanRecoveryBePerformed()
Declaration
bool CanRecoveryBePerformed()
Returns
| Type | Description |
|---|---|
| Boolean |
canUseUnmanagedAccount()
Declaration
bool canUseUnmanagedAccount()
Returns
| Type | Description |
|---|---|
| Boolean |
ChangeEmail(String)
Changes the email address of the current user. Performs network IO to immediately sync the change to the server.
Declaration
void ChangeEmail([NotNull] string value)
Parameters
| Type | Name | Description |
|---|---|---|
| String | value | The new email address to use. |
ChangeName(String)
Changes the name of the current user. Performs network IO to immediately sync the change to the server.
Declaration
void ChangeName([NotNull] string value)
Parameters
| Type | Name | Description |
|---|---|---|
| String | value | The new name to use. |
ChangePassword(String, String)
Changes the password of the current user.
Declaration
void ChangePassword([NotNull] string oldPassword, [NotNull] string newPassword)
Parameters
| Type | Name | Description |
|---|---|---|
| String | oldPassword | The current password of the user. |
| String | newPassword | The new password for the user. |
Remarks
When performing a password change using a managed user, the account is converted to be an unmanaged user. This causes the account password to detach from the Active Directory password. However, the account keeps associations with AD Groups used in Policies, Smartkeys, Assignments, and so forth. Prior to being able to change the password of a managed user, the server must be configured to allow that user to become an unmanaged user. See the SEM Documentation for guidance on how to accomplish this.
changesWereNotSaved()
If unable to save serials, this function must be called. The localDirty flags will be reset to the state before the request to serialize.
Declaration
void changesWereNotSaved()
ChangeUrl(String)
Used exclusively for SMDS identities. Used to indicate the URL of the server hosting the identity. Performs network IO to immediately sync the change to the server.
Declaration
void ChangeUrl([NotNull] string value)
Parameters
| Type | Name | Description |
|---|---|---|
| String | value | The new URL to use. |
CreateAccount(String, String, String)
Does not pay attention to whether or not an account already exists. All metadata will be replaced with new ones. ONLY CALL THIS IF YOU'VE ALREADY FAILED TO LOG IN. Does not sync and does not create keys.
Declaration
void CreateAccount([NotNull] string email, [CanBeNull] string name, [NotNull] string password)
Parameters
| Type | Name | Description |
|---|---|---|
| String | ||
| String | name | Can be |
| String | password |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | If account creation fails. |
See Also
CreateSatelliteServerAccount(String, String, String, String, String)
Create a new satellite server account for a new Smartcrypt Enterprise Manager. The account will be created online unless in isolated mode.
Declaration
void CreateSatelliteServerAccount([NotNull] string email, [NotNull] string name, [NotNull] string url, [NotNull] string password, [CanBeNull] string licenseRequest = null)
Parameters
| Type | Name | Description |
|---|---|---|
| String | Email address of the satellite account. |
|
| String | name | Name of the satellite account. |
| String | url | URL of the satellite account. |
| String | password | Password for the account. |
| String | licenseRequest | Optional JSON string with license request. Will only be used when creating an online account. |
See Also
DecryptV2(String)
Performs V2 decryption using the RSA private key of the logged-in identity.
Declaration
[NotNull]
byte[] DecryptV2([NotNull] string data)
Parameters
| Type | Name | Description |
|---|---|---|
| String | data | The data to decrypt. |
Returns
| Type | Description |
|---|---|
| Byte[] | The decrypted data. |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | With Category of CategoryUpgrade if the data are newer than understood by this software. With Category of CategoryInternal if the data are in an invalid format. |
See Also
DecryptV3(String)
Performs V3 decryption using the AES key of the logged-in identity.
Declaration
[NotNull]
byte[] DecryptV3([NotNull] string data)
Parameters
| Type | Name | Description |
|---|---|---|
| String | data | The data to decrypt. |
Returns
| Type | Description |
|---|---|
| Byte[] | The decrypted data. |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | With Category of CategoryUpgrade if the data are newer than understood by this software. With Category of CategoryInternal if the data are in an invalid format. |
See Also
DeleteAppDatum(String, String)
Declaration
void DeleteAppDatum(string kind, string name)
Parameters
| Type | Name | Description |
|---|---|---|
| String | kind | |
| String | name |
EncryptAccountPassword(String)
Declaration
[NotNull]
string EncryptAccountPassword([NotNull] string accountPassword)
Parameters
| Type | Name | Description |
|---|---|---|
| String | accountPassword |
Returns
| Type | Description |
|---|---|
| String |
GET(String)
Declaration
string GET(string suffix)
Parameters
| Type | Name | Description |
|---|---|---|
| String | suffix |
Returns
| Type | Description |
|---|---|
| String |
GetApplicationStatus(String, String, String)
Returns an ApplicationStatus through which ApplicationCompliance can be reported. A new ApplicationStatus will be created if one does not already exist for the given parameters.
Declaration
[NotNull]
ApplicationStatus GetApplicationStatus([NotNull] string kind, [CanBeNull] string version = null, [NotNull] string referenceUrn = "")
Parameters
| Type | Name | Description |
|---|---|---|
| String | kind | The name of the component for which this entry is being reported. For example,
|
| String | version | An optional string of the version of the component for which this entry is being reported. |
| String | referenceUrn | A unique identifier, used to differentiate statuses when multiple exist for the
same app + |
Returns
| Type | Description |
|---|---|
| ApplicationStatus | An application status object which can be updated with ApplicationCompliance objects. |
Remarks
Application status is useful for reporting to Smartcrypt Enterprise Manager the state of various subsystems of your application. For example, PKWARE's PDE application uses application status to report whether or not all files in a Smartpoint are encrypted according to the policy defined for that smartpoint.
GetArchiveDecryptionPassword(String)
Given asset information as described below, extracts a decryption password. May perform network I/O and will auto-request access if needed.
Declaration
string GetArchiveDecryptionPassword(string jsonOrUrn)
Parameters
| Type | Name | Description |
|---|---|---|
| String | jsonOrUrn | Whenever possible, the full asset JSON should be provided. The JSON will include all information to correctly find an asset. If only the URN is provided, the asset may not be found. |
Returns
| Type | Description |
|---|---|
| String | The password requested in UTF-8. |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | With a Category of CategoryInternal if the json provided is in an unrecognized format, or with CategoryNotFound if the password cannot be found. Other variations of the exception may be thrown as well. |
GetClusterServers()
Declaration
IEnumerable<string> GetClusterServers()
Returns
| Type | Description |
|---|---|
| IEnumerable<String> |
GetEntitlement(String, String)
Declaration
[CanBeNull]
string GetEntitlement([NotNull] string name, [CanBeNull] string defaultValue = null)
Parameters
| Type | Name | Description |
|---|---|---|
| String | name | The name of the entitlement. |
| String | defaultValue |
Returns
| Type | Description |
|---|---|
| String | The value for the entitlement of the given name, or the |
GetManagedAesKey(String)
Declaration
[NotNull]
IManagedAesKey GetManagedAesKey([NotNull] string serialized)
Parameters
| Type | Name | Description |
|---|---|---|
| String | serialized |
Returns
| Type | Description |
|---|---|
| IManagedAesKey |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | With Category of CategoryUpgrade if the serialized content cannot be parsed. Also with other categories for other reasons. |
GetManagedAesKeys()
Declaration
IEnumerable<ISingleAssetManager> GetManagedAesKeys()
Returns
| Type | Description |
|---|---|
| IEnumerable<ISingleAssetManager> | All managed keys. Each can be used for various purposes. Perform filtering before use. |
GetNotifications()
Declaration
ISet<Notification> GetNotifications()
Returns
| Type | Description |
|---|---|
| ISet<Notification> |
getPrefix()
Declaration
string getPrefix()
Returns
| Type | Description |
|---|---|
| String |
GetPublicKey()
Returns the public key of the current user.
Declaration
[CanBeNull]
string GetPublicKey()
Returns
| Type | Description |
|---|---|
| String | The public key of the current user. Will be |
GetSyncInterval()
Declaration
TimeSpan GetSyncInterval()
Returns
| Type | Description |
|---|---|
| TimeSpan |
getUserEmail()
Gets the email address of the current user.
Declaration
[CanBeNull]
string getUserEmail()
Returns
| Type | Description |
|---|---|
| String | The email address of the current user. Will be |
getUserETag()
Declaration
int getUserETag()
Returns
| Type | Description |
|---|---|
| Int32 |
getUserId()
Declaration
long getUserId()
Returns
| Type | Description |
|---|---|
| Int64 |
getUserName()
Gets the name of the current user.
Declaration
[CanBeNull]
string getUserName()
Returns
| Type | Description |
|---|---|
| String | The name of the current user. Will be |
getUserURN()
Declaration
string getUserURN()
Returns
| Type | Description |
|---|---|
| String |
getXPIDs()
Declaration
IList<KnownUser> getXPIDs()
Returns
| Type | Description |
|---|---|
| IList<KnownUser> | All Smartcrypt users known to the user, excluding the representation of the current user. |
isAccountAllowed()
Declaration
bool isAccountAllowed()
Returns
| Type | Description |
|---|---|
| Boolean |
IsAccountManaged(String)
Query server and find out if this email is a managed account.
Declaration
bool IsAccountManaged([NotNull] string email)
Parameters
| Type | Name | Description |
|---|---|---|
| String |
Returns
| Type | Description |
|---|---|
| Boolean |
|
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | Primarily for network reasons, but could be others as well. Best to display to the user. With CategoryMigrationRequired if needing to migrate. |
isAuthenticated()
Declaration
bool isAuthenticated()
Returns
| Type | Description |
|---|---|
| Boolean |
isDeviceAllowed()
Declaration
bool isDeviceAllowed()
Returns
| Type | Description |
|---|---|
| Boolean |
isLicensed()
Will perform a network call.
Declaration
bool isLicensed()
Returns
| Type | Description |
|---|---|
| Boolean |
|
Exceptions
| Type | Condition |
|---|---|
| MetaClientException |
isLoggedIn()
Declaration
bool isLoggedIn()
Returns
| Type | Description |
|---|---|
| Boolean |
isManagedAccount()
Declaration
bool isManagedAccount()
Returns
| Type | Description |
|---|---|
| Boolean |
isOfflineAccessExpired()
Declaration
bool isOfflineAccessExpired()
Returns
| Type | Description |
|---|---|
| Boolean |
isRegistered()
Declaration
bool isRegistered()
Returns
| Type | Description |
|---|---|
| Boolean |
isSatellite()
Indicates whether or not this instance of MetaClient is communicating with a satellite MDS.
Declaration
bool isSatellite()
Returns
| Type | Description |
|---|---|
| Boolean |
|
Remarks
Prior to a call to PKWARE.Smartcrypt.MetaClient.MetaState.CheckDomain(System.String), which happens during typical login flows or a restore from serialized state, this function is not guaranteed to be accurate.
Login(String, String, String)
Attempts to log in the specified user.
Declaration
void Login([NotNull] string email, [NotNull] string password, [CanBeNull] string oldPassword = null)
Parameters
| Type | Name | Description |
|---|---|---|
| String | The email address of the user. Must include the domain. Ex. |
|
| String | password | The current password of the user. |
| String | oldPassword | The previous password of the user. This is not required, but is available for use by application that do not synchronize the SID and do not run in isolated mode. |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException |
LoginImplicitAccount()
Performs a login using a system user. On Windows, the Windows user account owning this process is used. On
Mac and Linux, the Kerberos user setup via kinit
or a similar utility is used.
Declaration
void LoginImplicitAccount()
Remarks
When this login method is used, Login(String, String, String) and LoginManagedAccount(String, String) must not be used. Additionally, a custom server URL must be provided using Server.
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | For all sorts of reasons. |
See Also
LoginManagedAccount(String, String)
Declaration
void LoginManagedAccount([NotNull] string emailWithHost, [NotNull] string accountPassword)
Parameters
| Type | Name | Description |
|---|---|---|
| String | emailWithHost | |
| String | accountPassword |
LoginManagedAccountEncPass(String, String)
Declaration
void LoginManagedAccountEncPass([NotNull] string emailWithHost, [NotNull] string encryptedAccountPassword)
Parameters
| Type | Name | Description |
|---|---|---|
| String | emailWithHost | |
| String | encryptedAccountPassword | The account password after going through EncryptAccountPassword(String). |
Logout()
Enables this instance to be used with another user. Information about the server(s) this instance was communicating with is retained.
Declaration
void Logout()
lookupUsers(IList<String>)
Asks the server for user information for the provided email addresses. Duplicates are collapsed.
Declaration
IList<KnownUser> lookupUsers(IList<string> emails)
Parameters
| Type | Name | Description |
|---|---|---|
| IList<String> | emails |
Returns
| Type | Description |
|---|---|
| IList<KnownUser> |
migrate(String, String, String, Boolean)
Declaration
void migrate(string email, string password, string accountPassword, bool mfaExpected)
Parameters
| Type | Name | Description |
|---|---|---|
| String | ||
| String | password | |
| String | accountPassword | |
| Boolean | mfaExpected |
POST(String, String)
Declaration
string POST(string suffix, string text)
Parameters
| Type | Name | Description |
|---|---|---|
| String | suffix | |
| String | text |
Returns
| Type | Description |
|---|---|
| String |
ProcessIsolatedUpdate(String)
Declaration
void ProcessIsolatedUpdate([NotNull] string blob)
Parameters
| Type | Name | Description |
|---|---|---|
| String | blob |
RecoverPassword(String, Boolean, String)
The final step of the password recovery process for unmanaged users.
Declaration
[NotNull]
string RecoverPassword([NotNull] string recoveryToken, bool mfaExpected, [CanBeNull] string recoveryCipher = null)
Parameters
| Type | Name | Description |
|---|---|---|
| String | recoveryToken | The recovery token sent to the user via email after initiating password recovery via RequestRecoveryEmail(String). |
| Boolean | mfaExpected | |
| String | recoveryCipher | The encrypted password. If empty, the value stored by MetaClient will be used. |
Returns
| Type | Description |
|---|---|
| String | The recovered password. |
Remarks
Only unmanaged users can recover their password. Managed users should be directed to their system administrator.
Exceptions
| Type | Condition |
|---|---|
| MetaClientException |
See Also
RequestAccess(String)
Declaration
void RequestAccess(string serialized)
Parameters
| Type | Name | Description |
|---|---|---|
| String | serialized |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | With Category of CategoryUpgrade if the serialized content cannot be parsed. May also happen as a results of network problems and other reasons. |
requestEmailVerification()
Declaration
void requestEmailVerification()
RequestRecoveryEmail(String)
Declaration
void RequestRecoveryEmail([NotNull] string email)
Parameters
| Type | Name | Description |
|---|---|---|
| String | If empty, the value from the PKWARE.Smartcrypt.MetaClient.PID will be used. |
RespondToNotification(String, String)
Declaration
void RespondToNotification([NotNull] string urn, [NotNull] string action)
Parameters
| Type | Name | Description |
|---|---|---|
| String | urn | |
| String | action |
RestoreAll(IDictionary<String, String>)
Declaration
void RestoreAll([NotNull] IDictionary<string, string> serials)
Parameters
| Type | Name | Description |
|---|---|---|
| IDictionary<String, String> | serials |
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | If the data being restored are invalid. Invalid means that there are a different number than expected or that any are different from when we last saw them. |
SaveAppData(String, String, String)
Declaration
void SaveAppData(string kind, string name, string value)
Parameters
| Type | Name | Description |
|---|---|---|
| String | kind | |
| String | name | |
| String | value |
SerializeAll(Boolean)
It is assumed that all data after this call are successfully transformed. If that is not the case, you must call changesWereNotSaved().
Declaration
[NotNull]
IDictionary<string, string> SerializeAll(bool incremental = true)
Parameters
| Type | Name | Description |
|---|---|---|
| Boolean | incremental | If |
Returns
| Type | Description |
|---|---|
| IDictionary<String, String> | The serials to save/delete. Deletion is indicated by a map value of |
SetServer(String)
Sets the new server to communicate with. This does not involve any network IO. Clears the MDS public key.
Declaration
void SetServer([NotNull] string url)
Parameters
| Type | Name | Description |
|---|---|---|
| String | url | The URL of the server. |
SetStat(String, String, Int64)
Declaration
void SetStat(string kind, string qualifier, long value)
Parameters
| Type | Name | Description |
|---|---|---|
| String | kind | |
| String | qualifier | |
| Int64 | value |
shouldPersistCredentials()
Declaration
bool shouldPersistCredentials()
Returns
| Type | Description |
|---|---|
| Boolean |
Sign(String)
Performs an RSA signature of the content, using the RSA private key of the logged-in identity.
Declaration
[NotNull]
string Sign([NotNull] string data)
Parameters
| Type | Name | Description |
|---|---|---|
| String | data | The data to sign. |
Returns
| Type | Description |
|---|---|
| String | The signature with the |
See Also
SwitchToCentral(String)
Declaration
void SwitchToCentral([NotNull] string prefix)
Parameters
| Type | Name | Description |
|---|---|---|
| String | prefix | The base URL of the central server. For example, {@code https://vcs.pkware.com/mds}. |
switchToDomain(String)
May overwrite any previous information passed to SwitchToCentral(String). Performs network IO.
Declaration
bool switchToDomain(string domainOrEmail)
Parameters
| Type | Name | Description |
|---|---|---|
| String | domainOrEmail | Domain name registered with CMDS or the email address of the current user, from which the domain will be deduced. |
Returns
| Type | Description |
|---|---|
| Boolean |
|
Exceptions
| Type | Condition |
|---|---|
| MetaClientException | Primarily for network reasons, but could be others as well. Best to display to the user. |
sync()
Declaration
void sync()
WrapSessionKeyWithSmartkey(String, String)
Wraps the session key for secure storage and future retrieval. Expands the existing session key to 256 bits and wraps it for secure storage and future retrieval.
Declaration
[NotNull]
EncryptionInfo WrapSessionKeyWithSmartkey([NotNull] string smartkeyUrn, [CanBeNull] string sessionKey = null)
Parameters
| Type | Name | Description |
|---|---|---|
| String | smartkeyUrn | Of a locally held key. |
| String | sessionKey | If |
Returns
| Type | Description |
|---|---|
| EncryptionInfo | The session key and json document allowing key retrieval. |


Isntit
Isntit is a simple javascript data validation library. It is inspired by ansman's validate.js.
Example
<script src="dist/isntit.min.js" type="text/javascript"></script>
var options = {
capitalize: true, // capitalize error messages
devtools: config.env !== 'production', // activate devtools (! disabled in production files)
fullMessages: true, // prepend messages with the field name
config: { // override config
silent: false // prevent warnings even with devtools
}
};
var rules = {
email: {
required: true,
email: {
message: "^'%{value}' is not a valid %{label} ex<EMAIL_ADDRESS>},
label: 'email address'
},
user.firstname: {
required: true,
length: {
min: 3
},
label: 'firstname'
},
user.age: {
required: false, // Isntit warns about and skip a rule with false
length: {
min: 3
}
}
};
var I = new Isntit(rules, options);
var results = I.validate({
email<EMAIL_ADDRESS>"user.firstname": "stoempsaucisse"
});
Installation
Standalone
Simply grab isntit.js (for development) or isntit.min.js (for production) and serve it.
NPM (TODO)
npm install isntit
Features
- devtools: get usefull warnings during runtime (only enabled in development files)
- extendable: register your own data checker
- use steps to prioritize some checkers upon others (if a step fails, checkers in following steps are not called)
- helpers:
Isntit.printf(string: string, replacements: Array<any>)
orIsntit.isEmpty(value: any)
Documentation
Isntit uses JSDoc to automaticaly generate its documentation.
Unit testing
Actually only validation, string helpers and type checking are covered. Sinon.js, Should.js and should-sinon (Sinon.js bindings for Should.js) are needed to run the tests.
npm i should sinon should-sinon --save-dev
Many thanks to:
- ansman for his inspiring validate.js.
- Evan You aka. yyx990803 for his awesome vuejs and inspiration in coding style and utilities.
- Jan Goyvaerts for his email regular expression


--- layout: post title: Ruby | WTF "hello world" categories: [humor, tumblr, ruby] --- Ruby | WTF "hello world"
wonderful Ruby “Hello World” H.e.l.l.o. in almost symmetrical code.
WTF??