What is NodeJS
Node is an asynchronous event driven framework built on Chromes JavaScript ending and designed for creating scalable network applications
What makes node different than developing with more traditional server side languages?
Difference between nodejs and PHP is this,
NodeJs is best used for I/O bound applications but it is not so good for CPU heavy applications. Some examples of good uses of NodeJS are Data-Intensive Real Time (DIRT) applications, singlepage applications, JSON API's, and data streaming applications
The main idea behind NodeJs is to use non-blocking, event-driven I/O to remain lightweight and efficient in the face of DIRT apps that run across distributed devices. It is not the end all be all of web platforms, but rather a platform that fulfills a particular need. It really shines when building in building fast, scalable network applications because it is capable of handling a huge number of simultaneous connections with high throughput.
Node works by only using one thread and using non-blocking I/O calls allows it to support tens of thousands of concurrent connections.
The Node Package Manager is pretty awesome because it allows for installing application dependencies locally not globally, it can handle multiple versions of the same module at the same time, and many other goodies.
To install NodeJs, you need a C++ compiler. You would probably be using gitBash. There are several commands you need to do. First you install Node Version Manager (NVM) Once you install that, you should have access to node and npm.
Node uses the CommonJs interface for modules. You can also load other dependencies using the "require" keyword.
An example of requiring native modules would be:
var http = require('http'); var dns = require('dns');One thing that is nice about node modules is that they are not automatically set as global variables. When creating your own modules, there are two approaches
Node passes functions with a Continuation-passing style (CPS) What this is is that control is passed explicitly in the for of continuation.
What is the concept of non blocking IO?
Non-blocking I/O is, in essence, simultaneous processing. More specifically, when a web request comes in to the nodejs webserver, and the request is accepted, the webserver will send it off to a listener object and remain ready to accept any other requests.
All of this happens in a queue and is asynchronous in how it works. What this means is that they are happening in a line.


The Spry Debugger feature allows users to debug Spry code in all browsers. Because of varying support for debuggers on different browsers, we have worked on our own JavaScript debugger that is independent of the browser. The Spry Debugger is under development and we know that are some bugs and the interface can be improved, but as it stands, it may be a helpful tool for getting insight into your page.
To use the debugger on your page, you need to get two files: 'SpryDebug.js' and 'SpryDebug.css' and include them in the head of the page. Once these files have been added to the page, and you load the page in browser, the Spry Debugger window will be displayed. The Spry Debugger window will appear over all elements from your page. If you want to change the window position, drag and drop it anywhere on the page using the blue bar at the top.
Using the Debugger
The Spry Debugger allows you to inspect the HTML elements from page, giving a snapshot of all current element properties.
A way to inspect the HTML elements is to use the mouse to simply cllck on them. This behavior is enabled by:
After the element is selected, the mouse introspection stops. To make a new introspection, repeat these steps again.
The Spry Debugger window will list all the properties for the HTML element. All the variables names are listed in the left column in the Spry Debugger window . In the right column are listed their corresponding values. The last row from the bottom contains all the available javascript functions for the given html element.
The label in red color displays the list of css properties with their values at runtime. The blue link like values represents Java Script objects. Their details can be shown/hidden by clicking on the link.
Real Time Debugging
The Spry Debugger window also provides a line console for real time debugging. For example, the debugger line console from the Spry Debugger window can be used to inspect current values of JavaScript variables. You can type the variable name and then hit enter to get all the information about it. There is also basic code completion for the javascript variables on the page. For example, if you type: "document." into the debugger line console, and then press "Tab" key, all related variables and functions are suggested.
You can debug the code in real time by calling the 'debug.log' JavaScript function directly in the page. This function accepts as parameters, one to many comma separated strings or variables . Each argument will be listed on the Spry Debugger window in detail.
The debug.log() call can be used to trace the code execution using simple strings as parameter.
When page loads, the Spry Debugger window is displayed. No variable/property are listed by default.
You can also use the debugger console line to introspect your page. Type the variable name into the debugger console line and hit enter to get the information about the element.
The Spry Debugger window will list all the properties for the html element.
Click the image to get its properties.
Copyright © 2007. Adobe Systems Incorporated.
All rights reserved.


GREMLINS (1984) Reviewed By David Wilcock (C)1998 David Wilcock
Starring Zach Galligan, Phoebe Cates, Hoyt Axton, Scott Brady and Polly Holliday
Directed By Joe Dante
This Steven Spielberg produced film became another hit for him, even if he didn't direct it. The film opens with Ran Peltzer (Axton) walking around in Chinatown. He walks into an odd shop, run by a very old chinese man (Keye Luke) An odd creature called Gizmo, who is a mowlgi. Ran buys the pet, three rules are told to him (no water on Gizmo, no bright light, and don't feed him after midnight, classic fairy tale stuff) and Ran gives Gizmo to his son, Billy (Galligan) Of course, the rules are broken, and a group of evil creatures start terrorising the quiet town of Kingston Falls (a very Spielberg place), where Billy lives.
The problem with the film, though, is that Gremlins don't really get into swing until one hour into the movie, when the Gremlins drive a snow plough through a house. It's non stop action from there on. But before that, the story has to be set up, and Chris Columbus (Home Alone, Mrs Doubtfire) script has to keep the audiences attention. Sadly, his script does start to lag, but thankfully, the performances and direction don't. Galligan, Cates (who plays Billy girlfriend), Judge Reinhold (Ruthless People, Beverly Hills Cop) and Dick Miller (Twilight Zone The Movie) are all good,and push the film along. Polly Holliday is reasonable funny in the role of Mrs Beagle, even if her role is hopelessly underwritten. Joe Dante directs well, making sure he can get the best out of the performances.
But the best performances come from Gizmo, voiced by Howie Mandel, and the Gremlins. Gizmo is sickingly cute, and has got real character. The Gremlins, designed by Chris Walas (who did makeup effects for The Fly) are sickingly sick, and are really funny. Here, Joe Dante really shows what he's good at directing, which is manic comedy/horor. There are some great deaths, some silly scenes, and some groan worthy gags, but the film really gets going when the Gremlins finally start to cause chaos. Here, thankfully, any hope of a script disappears, and Columbus just gets on with the mischief.
Stick with the film, then, and it's ultimately rewarding. With some good music by Jerry Goldsmith (Total Recall, Star Trek: The Motion Picture) an excellent supporting cast (Dick Miller is very good) and some good (although nasty) laughs, the last 50 minutes of Gremlins is some of the best black comedy you are ever going to see. If only a stronger scriptwriter was hired, then maybe the first hour would be excellent also. Gremlins 2 is better than this, because it didn't have to explain much back story, and it was more enjoyable generally. Gremlins, then, although flawed, is still recommended.
OVERALL RATING=*** out of *****
REVIEW BY DAVID WILCOCK (C)1998
DAVID WILCOCK<EMAIL_ADDRESS>Visit the Wilcock Movie Page! http://wilcockmovie.home.ml.org -OR- http://www.geocities.com/hollywood/9061
The review above was posted to the
rec.arts.movies.reviews newsgroup (de.rec.film.kritiken for German reviews).
The Internet Movie Database accepts no responsibility for the contents of the
review and has no editorial control. Unless stated otherwise, the copyright
belongs to the author.
Please direct comments/criticisms of the review to relevant newsgroups.
Broken URLs inthe reviews are the responsibility of the author.
The formatting of the review is likely to differ from the original due
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Related links: index of all rec.arts.movies.reviews reviews


Dutch Great Van Basten Left Red-Faced After Nazi Quip
by SW EditorFormer Dutch football great Marco van Basten apologised Saturday after he was heard using a Nazi greeting to ridicule a Dutch television journalist’s German during an interview.
Van Basten, 55, who is regarded as one of the game’s best ever strikers, made the comment on Fox Sports pay-to-view channel after an interview ahead of the Eredivisie clash between Ajax and Heracles.
His words could be heard in the studio moments after TV presenter Hans Kraay’s interview in German with Heracles’ German manager Frank Wormuth.
“Not too pretty, sieg heil, pfannkuchen (pancake),” Van Basten said, using the Nazi German greeting during World War II.
His words unleased a Twitter storm and during half-time in the match the former Ajax and Ac Milan forward made his excuses for what he termed an “ill-placed joke”.
“It was not my intention at all to shock people. I only wanted to ‘explain’ Hans’ German,” a contrite Van Basten said.
But Van Basten’s misplaced comment left many fuming, not only because of what he said but also about its timing.
Football clubs in the Netherlands are taking active measures to fight racism following an incident last weekend when racist chants caused a second division match to be halted.
The referee briefly suspended Sunday’s game between Excelsior Rotterdam and Den Bosch and Excelsior winger Ahmad Mendes Moreira walked off the pitch.Van basten
Moreira said he heard monkey noises and songs about “Black Pete”, a traditional Dutch Christmas-time character that appears in blackface and attracts accusations of racist stereotyping, Dutch media reported.
Fox Sports also apologised for Van Basten’s comments, the daily Algemeen Dagblad reported.
“His comments were inappropriate. Not only for today, but for every day,” a spokesman told the paper.
Ajax beat Heracles 4-1 after goals among others by Quincy Promes and Zakaria Labyad.


|
Spring Social | ||||||||
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java.lang.Object org.springframework.social.connect.web.ConnectSupport
public class ConnectSupport
Provides common connect support and utilities for Java web/servlet environments.
Used by ConnectController
and ProviderSignInController
.
| Constructor Summary | |
|---|---|
ConnectSupport()
|
| Method Summary | |
|---|---|
java.lang.String |
buildOAuthUrl(ConnectionFactory<?> connectionFactory,
org.springframework.web.context.request.NativeWebRequest request)
Builds the provider URL to redirect the user to for connection authorization. |
java.lang.String |
buildOAuthUrl(ConnectionFactory<?> connectionFactory,
org.springframework.web.context.request.NativeWebRequest request,
org.springframework.util.MultiValueMap<java.lang.String,java.lang.String> additionalParameters)
Builds the provider URL to redirect the user to for connection authorization. |
protected java.lang.String |
callbackUrl(org.springframework.web.context.request.NativeWebRequest request)
|
Connection<?> |
completeConnection(OAuth1ConnectionFactory<?> connectionFactory,
org.springframework.web.context.request.NativeWebRequest request)
Complete the connection to the OAuth1 provider. |
Connection<?> |
completeConnection(OAuth2ConnectionFactory<?> connectionFactory,
org.springframework.web.context.request.NativeWebRequest request)
Complete the connection to the OAuth2 provider. |
void |
setApplicationUrl(java.lang.String applicationUrl)
Configures the base secure URL for the application this controller is being used in e.g. |
void |
setCallbackUrl(java.lang.String callbackUrl)
Configures a specific callback URL that is to be used instead of calculating one based on the application URL or current request URL. |
void |
setUseAuthenticateUrl(boolean useAuthenticateUrl)
Flag indicating if this instance will support OAuth-based authentication instead of the traditional user authorization. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public ConnectSupport()
| Method Detail |
|---|
public void setUseAuthenticateUrl(boolean useAuthenticateUrl)
oauthUrl
return this authenticate URL.
useAuthenticateUrl
- whether to use the authenticat url or notOAuth1Operations.buildAuthenticateUrl(String, OAuth1Parameters)
,
OAuth2Operations.buildAuthenticateUrl(GrantType, OAuth2Parameters)
public void setApplicationUrl(java.lang.String applicationUrl)
https://myapp.com
. Defaults to null.
If specified, will be used to generate OAuth callback URLs.
If not specified, OAuth callback URLs are generated from HttpServletRequests
.
You may wish to set this property if requests into your application flow through a proxy to your application server.
In this case, the HttpServletRequest URI may contain a scheme, host, and/or port value that points to an internal server not appropriate for an external callback URL.
If you have this problem, you can set this property to the base external URL for your application and it will be used to construct the callback URL instead.
applicationUrl
- the application URL valuepublic void setCallbackUrl(java.lang.String callbackUrl)
callbackUrl
- the callback URL to send to providers during authorization. Default is null.public java.lang.String buildOAuthUrl(ConnectionFactory<?> connectionFactory, org.springframework.web.context.request.NativeWebRequest request)
connectionFactory
- the service provider's connection factory e.g. FacebookConnectionFactoryrequest
- the current web request
java.lang.IllegalArgumentException
- if the connection factory is not OAuth1 based.public java.lang.String buildOAuthUrl(ConnectionFactory<?> connectionFactory, org.springframework.web.context.request.NativeWebRequest request, org.springframework.util.MultiValueMap<java.lang.String,java.lang.String> additionalParameters)
connectionFactory
- the service provider's connection factory e.g. FacebookConnectionFactoryrequest
- the current web requestadditionalParameters
- parameters to add to the authorization URL.
java.lang.IllegalArgumentException
- if the connection factory is not OAuth1 based.public Connection<?> completeConnection(OAuth1ConnectionFactory<?> connectionFactory, org.springframework.web.context.request.NativeWebRequest request)
connectionFactory
- the service provider's connection factory e.g. FacebookConnectionFactoryrequest
- the current web request
public Connection<?> completeConnection(OAuth2ConnectionFactory<?> connectionFactory, org.springframework.web.context.request.NativeWebRequest request)
connectionFactory
- the service provider's connection factory e.g. FacebookConnectionFactoryrequest
- the current web request
protected java.lang.String callbackUrl(org.springframework.web.context.request.NativeWebRequest request)
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{% include "header.html" %} {% block body %}
Respond to the most pressing @'s and Tweets with reassuring receipts of action in your community.


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Last weekend I tried 2-CT-2 for the first time. I was staying at a friend's place in the woods with about 20 others. After drinking about 12 beers over the course of a few hours, one of my friends offered to share a hallucinagenic pill with me.
I asked him if it was mescaline, since he'd recently tried some, and he told me that it was 2-CT-2. Neither of us had taken it before, but felt comfortable about it since we'd both eaten shrooms and acid many times before. We opened the 20 mg pill and made two lines.
After blowing the powder, both of us started experiencing effects within minutes. We had seperated very soon due to differing interests. If we had realized that the effects would come so fast, we'd have stayed together that first while.
It was dark out, and I was tripping pretty hard after 5-10 minutes. Having no sign of my tripping partner, and being surrounded by many drunk belligerents that did not know what I'd done, I retreated to my a girlfriend's car to relax for a while. At this point I was experiencing visual effects much stronger than any acid I'd ever taken, and I was actually worried for my health.
My girlfriend came to the car soon, finding me there to her surprise. I informed her of the situation, and she helped comfort me a little. I exited the car so she could move it down by the newly-lit bonfire, and proceeded to vomit all the beer and food I'd consumed.
My uneasy feelings persisted, and so I returned to the car and laid for about 40 minutes with my girlfriend. I felt cold and needed several blankets. I was feeling much more comfortable as time went on, although I felt mentally unable to hang out with all the people who were simply drinking. The visual effects were astounding. I saw tracers, morphing objects, general changes in hues, and I even saw it quickly light up outside many times as if there was lightning or a strobe light. I also had physical feelings similar to ecstacy and acid body highs.
At this point, my tripping friend appeared. He stayed in the car for a while, informing me that he'd vomited soon after taking the stuff. He had laid in the grass away from everyone for the last 40 minutes, also unable to be social.
Ten minutes later we became comfortable enough to head out to the bonfire with all the others, and had a great night from then on. I played guitar for hours, with all the drunk kids singing along. I kept tripping for the next 2 hours, and the effects slowly tapered off for hours afterward.
Besides the uncomfortable feelings the I experienced at the start, I enjoyed the experience. If I had known more about what I'd taken or had taken it before, I would've fared much better. I was not mentally prepared for such strong effects to take hold so quick, and I was not familiar with the drug.
For people who are trying this for the first time, it may be better to take orally. If you insufflate it, know that it will hit hard and fast. I have taken acid about 20 times and shroomed about 7 times, and nothing has compared to 2-CT-2. I would try it again, eating maybe 20-30 mg or blowing 10 mg like I did, but no more than that. The effects from 10 mg insufflated was strong enough for my tastes.
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.


|
MyoBridge Library
1.0
A high-level Arduino library to work with MyoBridge Firmware for the HM-11 SoC.
|
Header declaring the MyoBridge class with all necessary constants and types. More...
Go to the source code of this file.
Classes | |
| class | MyoBridge |
Macros | |
| #define | RX_BUFFER_SIZE 128 |
| #define | PACKET_BUFFER_SIZE 32 |
| Size of the packet buffer. 23 BLE mesage bytes plus some serial overhead. More... | |
| #define | RESULT_BUFFER_SIZE 32 |
| Size of the result buffer. 23 BLE mesage bytes plus some serial overhead. More... | |
Typedefs | |
| typedef myohw_imu_data_t | MyoIMUData |
| typedef myohw_classifier_event_t | MyoPoseData |
Enumerations | |
| enum | MyoBridgeSignal { SUCCESS = 0, ERR_RX_BUFFER_OVERFLOW = 1, ERR_INVALID_PACKET = 2, ERR_NO_PACKET = 3 } |
| Possible function returns. More... | |
| enum | MyoPose { MYO_POSE_REST = myohw_pose_rest, MYO_POSE_FIST = myohw_pose_fist, MYO_POSE_WAVE_IN = myohw_pose_wave_in, MYO_POSE_WAVE_OUT = myohw_pose_wave_out, MYO_POSE_FINGERS_SPREAD = myohw_pose_fingers_spread, MYO_POSE_DOUBLE_TAP = myohw_pose_double_tap, MYO_POSE_UNKNOWN = myohw_pose_unknown } |
| Supported poses. More... | |
| enum | MyoIMUMode { IMU_MODE_NONE = myohw_imu_mode_none, IMU_MODE_SEND_DATA = myohw_imu_mode_send_data, IMU_MODE_SEND_EVENTS = myohw_imu_mode_send_events, IMU_MODE_SEND_ALL = myohw_imu_mode_send_all, IMU_MODE_SEND_RAW = myohw_imu_mode_send_raw } |
| Supported IMU modes. More... | |
| enum | MyoEMGMode { EMG_MODE_NONE = myohw_emg_mode_none, EMG_MODE_SEND = myohw_emg_mode_send_emg, EMG_MODE_RAW = myohw_emg_mode_send_emg_raw } |
| Supported EMG modes. More... | |
| enum | MyoIMUMotion { IMU_MOTION_TAP = myohw_motion_event_tap } |
| Supported IMU motion events. More... | |
| enum | MyoConnectionStatus { CONN_STATUS_UNKNOWN = MYB_STATUS_UNKNOWN, CONN_STATUS_INIT = MYB_STATUS_INIT, CONN_STATUS_SCANNING = MYB_STATUS_SCANNING, CONN_STATUS_CONNECTING = MYB_STATUS_CONNECTING, CONN_STATUS_DISCOVERING = MYB_STATUS_DISCOVERING, CONN_STATUS_BRIDGE_SETUP = MYB_STATUS_DISCOVERING + 1, CONN_STATUS_READY = MYB_STATUS_DISCOVERING + 2, CONN_STATUS_LOST = MYB_STATUS_DISCOVERING + 3 } |
| Connection States. More... | |
Header declaring the MyoBridge class with all necessary constants and types.
This project is developed for research and educational purposes at Victoria University of Wellington, School of Engineering and Computer Science.
| #define PACKET_BUFFER_SIZE 32 |
Size of the packet buffer. 23 BLE mesage bytes plus some serial overhead.
| #define RESULT_BUFFER_SIZE 32 |
Size of the result buffer. 23 BLE mesage bytes plus some serial overhead.
| #define RX_BUFFER_SIZE 128 |
| typedef myohw_imu_data_t MyoIMUData |
| typedef myohw_classifier_event_t MyoPoseData |
| enum MyoBridgeSignal |
| enum MyoConnectionStatus |
Connection States.
| Enumerator | |
|---|---|
| CONN_STATUS_UNKNOWN |
Status of the Bluetooth module is unknown. |
| CONN_STATUS_INIT |
The Bluetooth module is initializing. |
| CONN_STATUS_SCANNING |
The Bluetooth module is scanning for the Myo. |
| CONN_STATUS_CONNECTING |
The Bluetooth module is connecting to the Myo. |
| CONN_STATUS_DISCOVERING |
The Bluetooth module is discovering the Myo's Bluetooth LE profile. |
| CONN_STATUS_BRIDGE_SETUP |
MyoBridge sets up connection parameters and retrieves information. |
| CONN_STATUS_READY |
MyoBridge is ready to use! |
| CONN_STATUS_LOST |
MyoBridge lost the connection. You can't use this connection any more, unless you call begin() again. |
| enum MyoEMGMode |
| enum MyoIMUMode |
Supported IMU modes.
| enum MyoIMUMotion |
| enum MyoPose |


This XHTML Basic 1.0 document is being sent with a Content-Type of text/html.
You can try loading this page with these MIME content types:
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tag above. HTML 2.0 compatible browsers will not render this tag as body text.
The registered content type for XHTML is application/xhtml+xml. The +xml suffix is standard for XML based media types by RFC 3023: XML Media Types.


Class SaslAuthenticator
- java.lang.Object
-
- org.apache.qpid.protonj2.engine.sasl.client.SaslAuthenticator
-
- All Implemented Interfaces:
SaslClientListener
public class SaslAuthenticator extends java.lang.Object implements SaslClientListener
Handles SASL traffic from the proton engine and drives the authentication process
-
-
Constructor Summary
Constructors Constructor Description SaslAuthenticator(SaslCredentialsProvider credentials)
Creates a new SASL Authenticator initialized with the given credentials provider instance.SaslAuthenticator(SaslMechanismSelector selector, SaslCredentialsProvider credentials)
Creates a new client SASL Authenticator with the givenMechanism
and client credentials provider instances.
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
handleSaslChallenge(SaslClientContext context, ProtonBuffer challenge)
Called when a SASL challenge frame has arrived and its effect applied, indicating the challenge sent by the 'server' peer.void
handleSaslMechanisms(SaslClientContext context, Symbol[] mechanisms)
Called when a SASL mechanisms frame has arrived and its effect applied, indicating the offered mechanisms sent by the 'server' peer.void
handleSaslOutcome(SaslClientContext context, SaslOutcome outcome, ProtonBuffer additional)
Called when a SASL outcome frame has arrived and its effect applied, indicating the outcome and any success additional data sent by the 'server' peer.SaslAuthenticator
saslComplete(EventHandler<SaslOutcome> saslCompleteEventHandler)
Sets a completion handler that will be notified once the SASL exchange has completed.-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
-
Methods inherited from interface org.apache.qpid.protonj2.engine.sasl.SaslClientListener
initialize
-
-
-
-
Constructor Detail
-
SaslAuthenticator
public SaslAuthenticator(SaslCredentialsProvider credentials)
Creates a new SASL Authenticator initialized with the given credentials provider instance. Because noMechanism
selector is given the full set of supported SASL mechanisms will be chosen from when attempting to match one to the server offered SASL mechanisms.- Parameters:
credentials
- The credentials that will be used when the SASL negotiation is in progress.
-
SaslAuthenticator
public SaslAuthenticator(SaslMechanismSelector selector, SaslCredentialsProvider credentials)
Creates a new client SASL Authenticator with the givenMechanism
and client credentials provider instances. The configuredMechanism
selector is used when attempting to match a SASLMechanism
with the server offered set of supported SASL mechanisms.- Parameters:
selector
- TheSaslMechanismSelector
that will be called upon to choose a server supported mechanism.credentials
- The credentials that will be used when the SASL negotiation is in progress.
-
-
Method Detail
-
saslComplete
public SaslAuthenticator saslComplete(EventHandler<SaslOutcome> saslCompleteEventHandler)
Sets a completion handler that will be notified once the SASL exchange has completed. The notification includes theSaslOutcome
value which indicates if authentication succeeded or failed.- Parameters:
saslCompleteEventHandler
- TheEventHandler
that will receive notification when SASL authentication has completed.- Returns:
- this
SaslAuthenticator
instance.
-
handleSaslMechanisms
public void handleSaslMechanisms(SaslClientContext context, Symbol[] mechanisms)
Description copied from interface:SaslClientListener
Called when a SASL mechanisms frame has arrived and its effect applied, indicating the offered mechanisms sent by the 'server' peer. The client should respond to the mechanisms event by selecting one from the offered list and calling theSaslClientContext.sendChosenMechanism(Symbol, String, ProtonBuffer)
method immediately or later using the same thread that triggered this event.In the event that the client implementation cannot proceed with SASL authentication it should call the
SaslClientContext.saslFailure(javax.security.sasl.SaslException)
to fail the SASL negotiation and signal theEngine
that it should transition to a failed state.- Specified by:
handleSaslMechanisms
in interfaceSaslClientListener
- Parameters:
context
- theSaslClientContext
that is to handle the mechanism selectionmechanisms
- the mechanisms that the remote supports.- See Also:
SaslClientContext.sendChosenMechanism(Symbol, String, ProtonBuffer)
,SaslClientContext.saslFailure(javax.security.sasl.SaslException)
-
handleSaslChallenge
public void handleSaslChallenge(SaslClientContext context, ProtonBuffer challenge)
Description copied from interface:SaslClientListener
Called when a SASL challenge frame has arrived and its effect applied, indicating the challenge sent by the 'server' peer. The client should respond to the mechanisms event by selecting one from the offered list and calling theSaslClientContext.sendResponse(ProtonBuffer)
method immediately or later using the same thread that triggered this event.In the event that the client implementation cannot proceed with SASL authentication it should call the
SaslClientContext.saslFailure(javax.security.sasl.SaslException)
to fail the SASL negotiation and signal theEngine
that it should transition to a failed state.- Specified by:
handleSaslChallenge
in interfaceSaslClientListener
- Parameters:
context
- theSaslClientContext
that is to handle the SASL challenge.challenge
- the challenge bytes sent from the SASL server.- See Also:
SaslClientContext.sendResponse(ProtonBuffer)
,SaslClientContext.saslFailure(javax.security.sasl.SaslException)
-
handleSaslOutcome
public void handleSaslOutcome(SaslClientContext context, SaslOutcome outcome, ProtonBuffer additional)
Description copied from interface:SaslClientListener
Called when a SASL outcome frame has arrived and its effect applied, indicating the outcome and any success additional data sent by the 'server' peer. The client can consider the SASL negotiations complete following this event. The client should respond appropriately to the outcome whose state can indicate that negotiations have failed and the server has not authenticated the client.In the event that the client implementation cannot proceed with SASL authentication it should call the
SaslClientContext.saslFailure(javax.security.sasl.SaslException)
to fail the SASL negotiation and signal theEngine
that it should transition to a failed state.- Specified by:
handleSaslOutcome
in interfaceSaslClientListener
- Parameters:
context
- theSaslClientContext
that is to handle the resulting SASL outcome.outcome
- the outcome that was supplied by the SASL "server".additional
- the additional data sent from the server, or null if none.- See Also:
SaslClientContext.saslFailure(javax.security.sasl.SaslException)
-
-


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Found 'eof' further down, but not on a separate line.
Close matches include '-eof' (!= 'eof').
cat <<-eof
Hello World
-eof
cat <<- eof
Hello World
eof
Your here document isn't properly terminated.
There is a line containing the terminator you've chosen, but it's not by itself on a separate line.
In the example code, the script uses <<-eof
, which is the operator <<-
followed by eof
. The script therefore looks for eof
and skips right past the intended terminator because it starts with a dash.
You will get some companion SC1042 errors mentioning lines that contain the string as a substring, though they all point to the start of the here document and not the relevant line:
In foo line 4:
Hello
^-- SC1041: Found 'eof' further down, but not on a separate line.
^-- SC1042: Close matches include '-eof' (!= 'eof').
Look at your here document and see which line was supposed to terminate it. Then ensure it matches the token exactly, and that it's on its own line with no text before or after.
Under Windows the error might occur due to the standard CRLF line-ending, which is Windows-specific. Try to change the line ending into LF.
None.
Note that SC1041 and SC1042 swapped numbers after v0.4.6 to improve the display order. This rare instance of number reuse was justified by them always occuring together on the same line.


Vardy, Maddison pull Leicester further clear of Arsenal
Leicester - Leicester opened up a nine-point lead over Arsenal in the battle for Champions League qualification and moved second in the Premier League with a 2-0 win over the Gunners on Saturday.
Jamie Vardy and James Maddison were the architects of another fine victory for the Foxes as the English duo struck in the space of seven second-half minutes.
Arsenal are now eight points adrift of the top four and will fall even further behind should Manchester City avoid defeat away to league leaders Liverpool on Sunday.
In the face of mounting speculation over his future, Emery surprisingly maintained Mesut Ozil alongside the front two of new captain Pierre-Emerick Aubameyang and Alexandre Lacazette.
That bold strategy nearly paid off when Lacazette fired the first big chance of the match inches wide after Aubameyang had burrowed his way into the area.
Thereafter, it was Leicester who had all the better chances to break the deadlock.
Vardy failed to connect with Ayoze Perez's dangerous cross before Maddison curled a free-kick inches wide.
Wilfred Ndidi was next to miss a glorious chance when he smashed off the crossbar with the goal gaping from Ricardo Pereira's cutback four minutes into the second half.
Arsenal were the first to put the ball in the net when Aubameyang supplied a characteristically clinical finish but was rightly flagged offside.
Vardy has an excellent record against Arsenal and when his chance came, the Premier League's top scorer was ruthless with a low finish past Bernd Leno from Youri Tielemans's pass.
The former England striker then turned provider as he laid the ball back into the path of Maddison to drill a low shot in from outside the box.
Arsenal offered precious little after going behind and have now won just two of their last 10 league games.


{% extends "organizing_hub_groups.html" %}
{% load static pages_tags wagtailcore_tags %}
{% block content %}
{{ block.super }}
{% if featured_groups %}
Our Revolution is made up of local groups from all around the world.
Browse Featured Groups or search all groups on the map to get
involved in your area today.
Local Groups
Featured Groups
Our Revolution is made up of local groups from all around the world. Search for a group to get involved in your area today.
State Organizing Committee
or State Chapter
Campus Group


Convert the user language name to it's 2 character long language code.
app.Language2Code(
name ) →
string
If no argument is passed, the current language code is returned.
Example - Show Language Code
function OnStart()
{
var lang_code = app.Language2Code();
app.Alert( lang_code, "Language Code:" );
}


Can you say no to...
A chance to collaborate and create something wonderful!

Hack Camp 1.0
1-2 Feb 2020
Integrated Startup Complex Kalamassery
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sign me up!
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Deployed page
A travel App designed for the user looking for a 5 day getaway. Uses multiple API's and stores user input for premium function.
Employee feedback application we built as a group project using JS, Jquery, mySql, Auth0, and Express.
5 day weather forecast for US based cities based on user search request. Makes call to weather API and stores recent user searches.


Company profile - Canadian Company Capabilities
Third-Party Information Liability Disclaimer
Some of the information on this Web page has been provided by external sources. The Government of Canada is not responsible for the accuracy, reliability or currency of the information supplied by external sources. Users wishing to rely upon this information should consult directly with the source of the information. Content provided by external sources is not subject to official languages, privacy and accessibility requirements.
NC Products (1978) Ltd.
Legal Name:
NC Products (1978) Ltd.
Operating Name:
NC Machine & Tool Co.
Mailing Address:
234 Hutchings StWINNIPEG, Manitoba
R2X 2Y2
Location Address:
234 Hutchings StWINNIPEG, Manitoba
R2X 2Y2
Tel.:<PHONE_NUMBER>
Fax:<PHONE_NUMBER>
Company Profile
NC Machine & Tool Company in Winnipeg
With passion and pride, our certified, highly-skilled journeymen deliver superior workmanship every time.
Since 1977, family-owned NC Machine & Tool Company and Heli Arc Welding have been serving our customers worldwide with precise workmanship, quick turnaround times and unsurpassed customer service.
Dan Roche started in a small shop on Elgin Avenue and along with his son, Chris, he has grown the company to the present 19,000 square-foot shop on Hutchings Street.
Our robust range of services includes:
CNC machining and turning
CNC cylindrical grinding
Conventional machine shop services
Prototyping and tool making
Gear and spline cutting
Fabrication
Precision parts development and manufacturing
Design and manufacturing of specialized equipment: jigs, tools and fixtures
CWB certified welding
Versatility & Strength
These attributes come from the talent and experience of our people. Even after 35 years of machining and fabricating, we are continually upgrading both our equipment and our team, which consists of:
-Government Certified Machinists/Tool and Die Makers
-CNC Programmers/Set up and Operators
-In-House Designers and Drafters
-In-House Quality Control Specialists
Specialties
Precision Machine Work
Manufacturing OEM Parts
Canadian Welding Bureau (CWB)
Machine Shop & Manufacturing Near the Heart of Winnipeg
With passion and pride, our certified, highly-skilled journeymen deliver superior workmanship every time.
Industries Served
Our diverse team can meet the needs of any industry:
● OEM Parts (Specialize in Manufacturing)
● Aerospace
● Food Equipment
● Medical Equipment
● Mining Equipment
● Transportation
● Automotive Agricultural
CNC Machining & Turning
Whether your design is simple or complex and whether you require a prototype or a full production run, NC Machine & Tool is eager to meet your needs. Our modern, state-of-the-art facility and experienced team allow us to consistently produce precise, quality machine shop parts in a timely manner.
We can easily meet the most rigid commercial and industrial specifications, and neither the largest nor the smallest production run is a problem for us. Our expertise also allows for a virtually non-existent learning curve when working with new or unfamiliar industries.
Welding Services
Heli Arc Welding, a division of NC Machine & Tool, is a full-service CWB certified welding shop that includes MIG, TIG, stick and gas welding. We can handle any and all of your welding needs.
Commitment
We care about our clients and we also care about our community, which is why we are a major sponsor of Manitoba’s Breast Cancer Pledge Ride, and a supporter of local high school and community college programs and apprenticeships, as well as Manitoba Apprentice Machinist/Tool and Die Maker programs.
Full profile
Full profile
Contact information
Company description
Product / Service / Licensing
● Aerospace
● Food Equipment
● Medical Equipment
● Mining Equipment
● Transportation
● Automotive Agricultural
We can easily meet the most rigid commercial and industrial specifications, and neither the largest nor the smallest production run is a problem for us. Our expertise also allows for a virtually non-existent learning curve when working with new or unfamiliar industries
Technology profile
We use only state-of-the-art machinery and equipment. Our inventory includes:
CNC Milling Machines
- (2) OKK + 4th Axis 51x26x26
- VMC Modern 51x26x21
- Bridge Port 40x30x19
- Modern KR 40x16x16
CNC Lathes
- Mori Sieki + Bar Feed 2-5/8" Bore 16x48
- (2) Modern BNC 2680 6" Bore 26x80
- Modern BNC 2060 4-1/8" Bore 20x60
Manual Milling Machines
- Modern Universal 36x15x16
- Modern Bed Mill 63x26x24
- (2) Modern Knee Mills 30x16x16
- (2) Varnamo Universal 30x16x10
Manual Lathes
- (2) DoAll 16x60
- (2) Summit 20x80
- TOS SN-50C 20x80
- Hardinge DSN59 8x10
Grinders
- Supertech Cylindrical CNC 10x20
- Supertech Cylindrical NC 12x36
- Proth Surface Grinder
Gear and Spline Cutting
- Havlik Vertical Slotter 40x12
- Vertical Gear Hob 24x21
- (2) Barber Colman Hobs 16x36
- Colonial Pull Broach 60"x15 Ton
Drills
- (2) Gear Head Arborga Drill Press
- Kovosit - Large Radial Drill
Saws
- DoAll Auto Feed Saw 12 inch
- Modern 10" Horizontal Saw
- Startrite 20" Band Saw
- Kalamazoo 20" Auto Feed Band
Welding
- (2) Miller 350 Syncrowave TIG
- (2) Miller 251 Millermatic MIG
- Air Crafter Rotary Weld Table
Specialty Equipment
- Electro Arc Metal Disintegrator
- EC9 Bench Top Marking System
- 50 Ton Press
- 1"x1/8 Production Tube Bender
Market profile
Alliances:
Strategic alliances:
Joint manufacturing AlliancesThird-Party Information Liability Disclaimer
Some of the information on this Web page has been provided by external sources. The Government of Canada is not responsible for the accuracy, reliability or currency of the information supplied by external sources. Users wishing to rely upon this information should consult directly with the source of the information. Content provided by external sources is not subject to official languages, privacy and accessibility requirements.
Contacts
Contact information
Description
Company description
Products, services and licensing
Product / Service / Licensing
● Aerospace
● Food Equipment
● Medical Equipment
● Mining Equipment
● Transportation
● Automotive Agricultural
We can easily meet the most rigid commercial and industrial specifications, and neither the largest nor the smallest production run is a problem for us. Our expertise also allows for a virtually non-existent learning curve when working with new or unfamiliar industries
Technology
Technology profile
We use only state-of-the-art machinery and equipment. Our inventory includes:
CNC Milling Machines
- (2) OKK + 4th Axis 51x26x26
- VMC Modern 51x26x21
- Bridge Port 40x30x19
- Modern KR 40x16x16
CNC Lathes
- Mori Sieki + Bar Feed 2-5/8" Bore 16x48
- (2) Modern BNC 2680 6" Bore 26x80
- Modern BNC 2060 4-1/8" Bore 20x60
Manual Milling Machines
- Modern Universal 36x15x16
- Modern Bed Mill 63x26x24
- (2) Modern Knee Mills 30x16x16
- (2) Varnamo Universal 30x16x10
Manual Lathes
- (2) DoAll 16x60
- (2) Summit 20x80
- TOS SN-50C 20x80
- Hardinge DSN59 8x10
Grinders
- Supertech Cylindrical CNC 10x20
- Supertech Cylindrical NC 12x36
- Proth Surface Grinder
Gear and Spline Cutting
- Havlik Vertical Slotter 40x12
- Vertical Gear Hob 24x21
- (2) Barber Colman Hobs 16x36
- Colonial Pull Broach 60"x15 Ton
Drills
- (2) Gear Head Arborga Drill Press
- Kovosit - Large Radial Drill
Saws
- DoAll Auto Feed Saw 12 inch
- Modern 10" Horizontal Saw
- Startrite 20" Band Saw
- Kalamazoo 20" Auto Feed Band
Welding
- (2) Miller 350 Syncrowave TIG
- (2) Miller 251 Millermatic MIG
- Air Crafter Rotary Weld Table
Specialty Equipment
- Electro Arc Metal Disintegrator
- EC9 Bench Top Marking System
- 50 Ton Press
- 1"x1/8 Production Tube Bender


FREQUENTLY ASKED QUESTIONS:
How to schedule my pickup?
You can download the android app here {ANDRIOD APP LINK HERE}. After the installation you can open the app and tap on schedule a pickup. Select the time and date of the pickup and confirm it. Our service executive will attend you in the time slot selected.
What is the process after scheduling a pickup?
You don't have to do a thing after you schedule a pickup. Our service executive will visit you, sort your clothes and count them in your presence and the same would be reflected in the order. You need not juggle with the numbers and sorting. And also if you have any special instructions/concerns regarding any clothes our executive will record them while you relax. Our executive will also click pictures of your clothes for reference with your permission. In case of any doubts and concerns from your side, our executives are qualified enough to suggest you different alternatives and specific services to address your concerns.
How fast can I have my clothes back?
We at WashApp continuously strive to return your clothes to you in best conditions within the shortest possible time. The turnaround time also depends on the type of service you choose. Presently, for basic services like wash iron, wash fold, we assure you that your clothes will adore your wardrobe within 24 hours from the scheduled pickup. It may take a little longer for premium services like dry-cleaning. As the age old saying goes ‘Sabr Ka Phal Meetha Hotha Hai’- The fruit of patience is sweet, we assure you that these services justify the longer turnaround time and will bring you happiness on the ‘value for money’ front too. The specific turnaround time for each service will be mentioned alongside the service offered and our service executive will inform you of the delivery date and time and also you can keep yourself updated by checking the status of your order in our WashApp.
What is the Minimum Order Quantity/Amount?
WashApp is launched to solve the problem of laundry for everyone. Every customer is equally important to us. But, due to the present constraints free pickup and delivery are offered on an order which is worth more than ₹150. As your love for us increases, so will our ability to serve you. We look forward to a day to remove the minimum order requirement for availing free pickup and delivery.
What if I miss my pickup/delivery?
WashApp aims at solving the problem of laundry to create more time for you and your family and friends. We understand the human intuition to make instant plans. We at WashApp wouldn't like our customer to feel the pickup/delivery as an obligation or an impediment to their plans. Live free. Just update us through our app or by contacting our support team. We will be happy to reschedule the appointment according to your convenience.
What if i want to reschedule my pickup/delivery?
How do I pay?
Payment shouldn't be a problem as we offer Cash on Delivery along with other options to pay the amount online through various e-wallets.
How do I contact support?
We are sorry that you had to contact support. You can place an email to our support by clicking here. Or you can call us 24/7 at +91-858-881-0354
Is stain removal guaranteed?
We at WashApp don't believe stains to be good. Stains spoil the look and feel of your clothing. We are very positive about the success of our process in removing stains. But, stain removal also depends on the nature and location of the stain on your fabric. We believe that stain removal must not be attained at the cost of the quality of the fabric. So, we employ processes which don’t spoil the fabric and tries to remove the stain at the same time. The specific processes and success rate can be discussed with our service executive.
Will stain removal delay my order?
Heavily soiled clothes require special attention and may take more time than the normal ones. Stain removal process may delay your order. The tentative delivery time will be mentioned to you by the service executive at the time of the pickup. We will be notifying you about any further delay in your order along with the reason.


Persisting theme using SharedPreferences (Android, iOS, and Web)
Posted on December 30, 2019 in Flutter
Background
In this previous article, we saw how to implement theme switching using Provider. In this article, we'll see how to persist the selected theme using SharedPreferences Flutter plugin. iOS platform uses NSUserDefaults
and Android platform uses SharedPreferences
implementations to store simple data to disk asynchronously.
The difference between persisting data using SharedPreferences plugin vs local database is that SharedPreferences plugin can not guarantee that writes will be persisted to disk after app restarts. However, saving data to local database is more reliable.
Checkout related articles:
Target Audience: Beginner
Recipe: Persisting selected theme using SharedPreferences plugin.
Focus Widget: SharedPreferences plugin
Goal: Persisting chosen theme in disk. Implement a simple UI with an image, text and a button to switch themes. Page's default theme is light. Clicking on "Switch Theme" button will apply dark theme to page, and vice versa. Switching theme will save selected theme using SharedPreferences plugin for Android, iOS and FlutterWeb. Flutter Web is supported since version: 0.5.6.
Light Theme:
Dark Theme:
Checkout the companion video tutorial:
Note: In this article, I'll only focus on persisting data using SharedPreferences plugin. Please refer to previous article for app architecture and other details.
Step #1. pubspec.yaml
Add package dependencies in pubspec.yaml
:
dependencies:
flutter:
sdk: flutter
#SharedPreferences plugin for Android, iOS and Web
shared_preferences: ^0.5.6
Step #2. App's entry point
This code recipe is a part of the code recipes app as shown below:
There are two ways to run this code recipe:
- StandAlone: Use following code snippet at the top of the themes_db.dart to run it independently.
void main() => runApp(ChangeNotifierProvider<ThemesNotifierSharedPrefs>(
child: ThemesSharedPrefsCaching(),
builder: (BuildContext context) {
return ThemesNotifierSharedPrefs();
}));
- Code Recipe App: Use following code in
router.dart
to run this code recipe as part of the code recipe app.
case THEMES_DEMO_SHAREDPREFS:
return MaterialPageRoute(builder: (context) {
return ChangeNotifierProvider<ThemesNotifierSharedPrefs>(
child: ThemesSharedPrefsCaching(),
builder: (BuildContext context) {
return ThemesNotifierSharedPrefs();
},
);
});
break;
Step #3. Loading theme from SharedPreferences
Stateful widget ThemesSharedPrefsCaching
loads active theme using Provider.of<ThemesNotifierSharedPrefs>(context)
.loadActiveThemeData(context);
themes_sharedPrefs.dart:
class _ThemesSharedPrefsCachingState extends State<ThemesSharedPrefsCaching> {
@override
Widget build(BuildContext context) {
Provider.of<ThemesNotifierSharedPrefs>(context)
.loadActiveThemeData(context);
return MaterialApp(
theme: Provider.of<ThemesNotifierSharedPrefs>(context).currentThemeData,
home: Scaffold(
appBar: AppBar(
title: Text("Theme Caching (SharedPreference)"),
),
body: body(),
));
}
...
}
themes_notifier_sp.dart:
Fetching theme_id
from database, loading and notifying currentTheme:
class ThemesNotifierSharedPrefs with ChangeNotifier {
...
Future<void> activateTheme(MyThemes theme) async {
var sharedPrefs = await SharedPreferences.getInstance();
await sharedPrefs.setInt('theme_id', theme.index);
}
void loadActiveThemeData(BuildContext context) async {
var sharedPrefs = await SharedPreferences.getInstance();
int themeId = sharedPrefs.getInt('theme_id') ?? MyThemes.light.index;
currentTheme = MyThemes.values[themeId];
}
set currentTheme(MyThemes theme) {
if (theme != null) {
_currentTheme = theme;
_currentThemeData = themeData[_currentTheme.index];
notifyListeners();
}
}
}
Step #4. Switching and Saving theme to database
Switching theme toggles previously selected theme. We don't need to explicitly remove old theme since sharedPrefs key theme_id
is updated to new value. Newly updated currentTheme
overwrites the theme_id
using api activateTheme(...)
.
class ThemesNotifierSharedPrefs with ChangeNotifier {
...
void switchTheme(BuildContext context) async {
currentTheme == MyThemes.light
? currentTheme = MyThemes.dark
: currentTheme = MyThemes.light;
activateTheme(currentTheme);
}
...
}
All Done !
Source Code
References:
- SharedPreferences plugin
- Cross-platform ToDo App template
- Previous article: Implement Flutter themes using Provider
- Related article: Persisting theme in LocalDatabase (Moor plugin)
Happy cooking with Flutter :)
Liked the article ? Couldn't find a topic of your interest ? Please leave comments or email me about topics you would like me to write ! BTW I love cupcakes and coffee both :)
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- 一、作業系統
- 二、Linux 程式設計
一、作業系統
(一) Semaphore
- Synchronization tool that does not require busy waiting.
- Semaphore S – integer variable
- Two standard operations modify S:
wait()
andsignal()
- Less complicated
- Can only be accessed via two indivisible (atomic) operations
wait(S)
while (S <= 0)
; //busy wait
S--;
}
signal(S) {
S++;
}
1. Usage
- Counting semaphore – integer value can range over an unrestricted domain
- Binary semaphore – integer value can range only between 0 and 1
- Then a
mutex lock
- Then a
- Can implement a counting semaphore S as a binary semaphore
- Can solve various synchronization problems
- Consider P1 and P2 that require S1 to happen before S2
P1:
S1;
signal(synch);
P2:
wait(synch);
S2;
2. Implementation
(1) Busy waiting
-
Must guarantee that no two processes can execute
wait()
andsignal()
on the same semaphore at the same time - Thus, implementation becomes the critical section problem where the wait and signal code are placed in the critical section
- Could now have busy waiting in critical section implementation
- But implementation code is short
- Little busy waiting if critical section rarely occupied
- Note that applications may spend lots of time in critical sections and therefore this is not a good solution
(2) with no Busy waiting
- With each semaphore there is an associated waiting queue
- Each entry in a waiting queue has two data items:
- value (of type integer)
- pointer to next record in the list
- Two operations:
block
– place the process invoking the operation on the appropriate waiting queuewakeup
– remove one of processes in the waiting queue and place it in the ready queue
typedef struct{
int value;
struct process *list;
} semaphore;
wait(semaphore *S) {
S->value--;
if (S->value < 0) {
// add this process to S->list;
block();
}
}
signal(semaphore *S) {
S->value++;
if (S->value <= 0) {
// remove a process P from S->list;
wakeup(P);
}
}
(二) Deadlock and Starvation
- Deadlock – two or more processes are waiting indefinitely for an event that can be caused by only one of the waiting processes
-
Let S and Q be two semaphores initialized to 1
- Starvation – indefinite blocking
- A process may never be removed from the semaphore queue in which it is suspended
- Priority Inversion
- Scheduling problem when lower-priority process holds a lock needed by higher-priority process
- Solved via priority-inheritance protocol
(三) Classical Problems of Synchronization
1. Bounded-Buffer Problem
- n buffers, each can hold one item
- Semaphore
mutex
initialized to the value 1 - Semaphore
full
initialized to the value 0 - Semaphore
empty
initialized to the value n
- Semaphore
(1) The structure of the producer process
do {
...
/* produce an item in next_produced */
...
wait(empty);
wait(mutex);
...
/* add next produced to the buffer */
...
signal(mutex);
signal(full);
} while (true);
(2) The structure of the consumer process
do {
wait(full);
wait(mutex);
...
/* remove an item from buffer to next_consumed */
...
signal(mutex);
signal(empty);
...
/* consume the item in next consumed */
...
} while (true);
2. Readers-Writers Problem
- A data set is shared among a number of concurrent processes
- Readers - only read the data set; they do not perform any updates
- Writers - can both read and write
- Problem - allow multiple readers to read at the same time
- Several variations of how readers and writers are treated – all involve priorities
- Shared Data
- Data set
- Semaphore
rw_mutex
initialized to 1 - Semaphore
mutex
initialized to 1 - Integer
read_count
initialized to 0
(1) The structure of a writer process
do {
wait(rw_mutex);
...
/* writing is performed */
...
signal(rw_mutex);
} while (true);
(2) The structure of a reader process
do {
wait(mutex);
read_count++;
if (read_count == 1) // only for the first reader entering
wait(rw_mutex);
signal(mutex); // if the first reader wait for rw_mutex, other readers will be blocked on wait(mutex)
...
/* reading is performed */
...
wait(mutex);
read_count--;
if (read_count == 0) // only for the last reader leaving
signal(rw_mutex);
signal(mutex);
} while (true)
(3) Problem
- First variation – no reader kept waiting unless writer has permission to use shared object
- Second variation – once writer is ready, it performs write asap
- Both may have starvation leading to even more variations
- Problem is solved on some systems by kernel providing
reader-writer locks
3. Dining-Philosophers Problem
- Philosophers spend their lives thinking and eating
- Don’t interact with their neighbors, occasionally try to pick up 2 chopsticks (one at a time) to eat from bowl
- Need both to eat, then release both when done
(1) In the case of 5 philosophers
- Shared data
- Bowl of rice (data set)
- Semaphore chopstick [5] initialized to 1
- The structure of Philosopher i:
do {
wait ( chopstick[i] );
wait ( chopStick[ (i+1) % 5] );
// eat
signal ( chopstick[i] );
signal (chopstick[ (i+1) % 5] );
// think
} while (TRUE);
- Incorrect use of semaphore operations:
- signal (mutex) …. wait (mutex)
- wait (mutex) … wait (mutex)
- Omitting of wait (mutex) or signal (mutex) (or both)
- Deadlock and starvation
(2) Monitors
- A high-level abstraction that provides a convenient and effective mechanism for process synchronization
- Abstract data type, internal variables only accessible by code within the procedure
- Only one process may be active within the monitor at a time
- But not powerful enough to model some synchronization schemes
Monitors Implementation
1. Using Semaphores
- Variables
semaphore mutex; // (initially = 1)
semaphore next; // (initially = 0)
int next_count = 0;
- Each procedure F will be replaced by
wait(mutex);
...
body of F;
...
if (next_count > 0)
signal(next)
else
signal(mutex);
- Mutual exclusion within a monitor is ensured
2. Condition Variables
- For each condition variable x, we have:
semaphore x_sem; // (initially = 0)
int x_count = 0;
- The operation
x.wait
can be implemented as:
x-count++;
if (next_count > 0)
signal(next);
else
signal(mutex);
wait(x_sem);
x-count--;
Resuming Processes
- If several processes queued on condition x, and x.signal() executed, which should be resumed?
- FCFS frequently not adequate
- conditional-wait construct of the form x.wait(c)
- Where c is priority number
- Process with lowest number (highest priority) is scheduled next
Allocate Single Resource
monitor ResourceAllocator
{
boolean busy;
condition x;
void acquire(int time) {
if (busy)
x.wait(time);
busy = TRUE;
}
void release() {
busy = FALSE;
x.signal();
}
initialization code() {
busy = FALSE;
}
}
(3) Solution
- Each philosopher i invokes the operations
pickup()
andputdown()
in the following sequence:- No deadlock, but starvation is possible.
DiningPhilosophers.pickup(i);
EAT
DiningPhilosophers.putdown(i);
monitor DiningPhilosophers
{
enum { THINKING; HUNGRY, EATING) state [5] ;
condition self [5];
void pickup (int i) {
state[i] = HUNGRY;
test(i);
if (state[i] != EATING) self [i].wait;
}
void putdown (int i) {
state[i] = THINKING;
/* test left and right neighbors */
test((i + 4) % 5);
test((i + 1) % 5);
}
void test (int i) {
if ((state[(i + 4) % 5] != EATING) &&
(state[i] == HUNGRY) &&
(state[(i + 1) % 5] != EATING)) {
state[i] = EATING;
self[i].signal();
}
}
initialization_code() {
for (int i = 0; i < 5; i++)
state[i] = THINKING;
}
}
二、Linux 程式設計
- 課程簡報
(一) mmap
void *mmap(void *addr, size_t len, int port, int flags, int fildes, off_t off);
- PORT_READ
- PORT_WRITE
- PORT_EXEC
- PORT_NONE
- MAP_PRIVATE
- MAP_SHARED
- MAP_FIXED
(二) msync
int msync(void* addr, size_t len, int flags);
- MS_AYSNC (非同步寫入)
- MS_SYNC (同步寫入)
- MS_INVALIDATE (再從檔案讀)
(三) munmap
-
int munmap(void * addr, size_t len);
fprintf.c
#include <stdio.h> #include <stdlib.h> #include <time.h> #define SIZE 100 int main() { FILE *fptr, *fptr2; int i, j; float a, b; srand(time(NULL)); fptr = fopen("ans.txt", "w"); if (!fptr){ printf("open error \n"); exit(1); } else { printf("open success, start writing into file\n"); } for (i = 1; i <= SIZE; i++) { a = ((float)rand() / (float)(RAND_MAX)) * 100; printf("[%3d] = %3.3f\n", i, a); fprintf(fptr, "%3.3f\n", a); } fclose(fptr); /*---------------------------------------------------------- */ fptr2 = fopen("ans.txt", "r"); if(!fptr2) { printf("open error\n"); exit(1); } else { printf("open success, start reading from file\n"); } i = 1; while (fscanf(fptr2, "%6f" ,&b) == 1) printf("[%3d] = %3.3f\n", i++, b); fclose(fptr2); return 0; }
- 執行結果
課堂作業
- 給予一個資料檔，計算其平均值與標準差。
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define SIZE 100
int main() {
FILE *fptr1, *fptr2;
int i;
float a = .0, total = .0, avg = .0;
float sigma = .0, sd = .0;
/* Use fptr1 to calculate total and average */
fptr1 = fopen("ans.txt", "r");
if (!fptr1) {
printf("open error\n");
exit(1);
}
else {
printf("\nopen success, fptr1 starts reading from file\n");
}
i = 1;
while (fscanf(fptr1, "%6f" ,&a) == 1) {
printf("[%3d] = %3.3f\n", i++, a);
total += a;
}
avg = (total / i);
fclose(fptr1);
/* Use fptr2 to calculate standard deviation */
fptr2 = fopen("ans.txt", "r");
if (!fptr2) {
printf("open error\n");
exit(1);
}
else {
printf("\nopen success, fptr2 starts reading from file\n");
}
i = 1;
while (fscanf(fptr2, "%6f" ,&a) == 1) {
sigma += (a - avg) * (a - avg);
i++;
}
sd = sqrt(sigma / i);
fclose(fptr2);
/* Output */
printf("\n\nThe average = %f\n", avg);
printf("The standard deviation = %f\n", sd);
return 0;
}
- 執行結果


Word Problems About Money
|
Let Us Learn
Read the word problem with your teacher.
Carl bought a toy car
for ₱50. He also bought batteries
worth ₱36.
How much did Carl pay in all?
Say again the four steps you learned in solving a word problem.
Step 1.
Know what is asked for.
Step 2.
Know what are given.
Step 3.
Write the number sentence.
Step 4.
Write the complete answer.
Solve the problem above.
Step 1.
What is asked? amount of money paid in all
Step 2.
What are given? ₱50, price of the toy car; ₱36,
price of the batteries
Step 3.
What is the number sentence?
Step 4.
What is the answer? Carl paid ₱86 in all.
Try to solve another problem.
Adam had ₱90. He bought a slice of cake worth ₱45.
How much was left of his money?
Do again the four steps in solving a word problem.
Step 1.
What is asked? amount of money left
Step 2.
What are given? ₱90, amount of Adam’s money;
₱45, price of the slice of cake
Step 3.
What is the number sentence?
Step 4.
What is the answer? Adam had ₱45 left of his money.
Let Us Try
Read and solve each word problem. Follow the four steps
in solving it. Write your answers on the lines. Write the number
sentence in vertical form.
-
Grandfather gave Kiko a ₱1 coin. Father also gave Kiko
a ₱5 coin. How much does Kiko have in all?
Step 3.
What is the number sentence?
Step 4.
What is the answer?
-
John has ₱75 in his coin bank. He put another ₱20 in it.
How much savings does he have in all?
Step 3.
What is the number sentence?
Step 4.
What is the answer?
-
Carol has ₱50. She wants to buy a hamburger that
costs ₱20. How much change will she get?
Step 3.
What is the number sentence?
Step 4.
What is the answer?
-
Ramil had ₱75. He bought a toy train worth ₱60.
How much was left of his money?
Step 3.
What is the number sentence?
Step 4.
What is the answer?
Let Us Practice
Read and solve each word problem. Follow the four steps
in solving it. Write your answers on the lines. Write the number
sentence in vertical form.
-
Mother gave Beth ₱50 on her birthday. Father gave
Beth ₱50 more. How much money does Beth have
in all?
Step 3.
What is the number sentence?
Step 4.
What is the answer?
-
Danny has ₱35 in his coin bank. He wants to put ₱20
more in it. How much savings will he have in all?
Step 3.
What is the number sentence?
Step 4.
What is the answer?
-
Helen has ₱70. If she will give her younger brother ₱20,
how much money will be left with her?
Step 3.
What is the number sentence?
Step 4.
What is the answer?


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evothings.easyble. EasyBLEDevice
Source: evothings-libraries/
This is the BLE DeviceInfo object obtained from the underlying Cordova plugin.
Methods
- readServices(success, fail[, options])
- writeCharacteristic(serviceUUID, characteristicUUID, value, success, fail)
- writeCharacteristicWithoutResponse(serviceUUID, characteristicUUID, value, success, fail)
- writeDescriptor(serviceUUID, characteristicUUID, descriptorUUID, value, success, fail)
- writeServiceCharacteristic()
- writeServiceCharacteristicWithoutResponse()
- writeServiceDescriptor()
Methods
close()
Close the device. This disconnects from the BLE device.
Example
device.close();
connect(success, fail)
Connect to the device.
Example
device.connect(
function(device)
{
console.log('device connected.');
// Read services here.
},
function(errorCode)
{
console.log('connect error: ' + errorCode);
});
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
success |
|
Called when connected: success(device). |
|
|
fail |
|
Called on error and if a disconnect happens. Format: error(errorMessage) |
disableNotification(serviceUUID, serviceUUID, characteristicUUID, success, fail[, options])
Unsubscribe from characteristic updates to stop notifications.
On Android you can disable automatic write of notify/indicate and write the configuration descriptor yourself, supply an options object as last parameter, see example below.
Example
// Example call:
device.disableNotification(
serviceUUID,
characteristicUUID,
function()
{
console.log('characteristic notification disabled');
},
function(errorCode)
{
console.log('disableNotification error: ' + errorCode);
});
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
serviceUUID |
string |
|
UUID of service that has the given characteristic (previous versions of this library allowed leaving out the service UUID, this is unsafe practice and has been deprecated, always specify the service UUID). |
|
serviceUUID |
|
|
UUID of service that has the given characteristic. |
|
characteristicUUID |
|
|
UUID of characteristic to unsubscribe from. |
|
success |
|
Success callback: success() |
|
|
fail |
|
Error callback: fail(error) |
|
|
options |
Yes |
Optional settings. |
disableServiceNotification()
Deprecated. Use function evothings.easyble.EasyBLEDevice#disableNotification
- Deprecated
enableNotification(serviceUUID, characteristicUUID, success, fail[, options])
Subscribe to value updates of a characteristic. The success function will be called repeatedly whenever there is new data available.
On Android you can disable automatic write of notify/indicate and write the configuration descriptor yourself, supply an options object as last parameter, see example below.
Example
// Example call:
device.enableNotification(
serviceUUID,
characteristicUUID,
function(data)
{
console.log('characteristic data: ' + evothings.ble.fromUtf8(data));
},
function(errorCode)
{
console.log('enableNotification error: ' + errorCode);
});
// Turn off automatic writing of the config descriptor (for special cases):
device.enableNotification(
serviceUUID,
characteristicUUID,
function(data)
{
console.log('characteristic data: ' + evothings.ble.fromUtf8(data));
},
function(errorCode)
{
console.log('enableNotification error: ' + errorCode);
},
{ writeConfigDescriptor: false });
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
serviceUUID |
string |
|
UUID of service that has the given characteristic (previous versions of this library allowed leaving out the service UUID, this is unsafe practice and has been deprecated, always specify the service UUID). |
|
characteristicUUID |
string |
|
UUID of characteristic to subscribe to. |
|
success |
|
Success callback: success(data). |
|
|
fail |
|
Error callback: fail(error). |
|
|
options |
Yes |
Optional settings. |
enableServiceNotification()
Deprecated. Use function evothings.easyble.EasyBLEDevice#enableNotification
- Deprecated
getName()
Get device name. If there is a device name present in advertisement data, this is returned. Otherwise the value of the device.name field is returned. Note that iOS caches the device.name field, but not the name in advertisement data. If you change name of the device, it is more reliable to use the field in advertisement data (this name is set in the device firmware code).
Example
var name = device.getName();
- Returns
-
Name of the device.
hasName(name)
Match device name. First checks the device name present in advertisement data, if not present checks device.name field.
Example
device.hasName('MyBLEDevice');
Parameter
| Name | Type | Optional | Description |
|---|---|---|---|
|
name |
|
|
The name to match. |
- Returns
-
true if device has the given name, false if not.
isConnected()
Check if device is connected.
Example
var connected = device.isConnected();
- Returns
-
true if connected, false if not connected.
readCharacteristic(serviceUUID, characteristicUUID, success, fail)
Read value of characteristic.
Example
device.readCharacteristic(
serviceUUID,
characteristicUUID,
function(data)
{
console.log('characteristic data: ' + evothings.ble.fromUtf8(data));
},
function(errorCode)
{
console.log('readCharacteristic error: ' + errorCode);
});
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
serviceUUID |
string |
|
UUID of service that has the given characteristic (previous versions of this library allowed leaving out the service UUID, this is unsafe practice and has been deprecated, always specify the service UUID). |
|
characteristicUUID |
string |
|
UUID of characteristic to read. |
|
success |
|
Success callback: success(data). |
|
|
fail |
|
Error callback: fail(error). |
readDescriptor(serviceUUID, characteristicUUID, descriptorUUID, success, fail)
Read value of descriptor.
Example
device.readDescriptor(
serviceUUID,
characteristicUUID,
descriptorUUID,
function(data)
{
console.log('descriptor data: ' + evothings.ble.fromUtf8(data));
},
function(errorCode)
{
console.log('readDescriptor error: ' + errorCode);
});
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
serviceUUID |
string |
|
UUID of service that has the given characteristic (previous versions of this library allowed leaving out the service UUID, this is unsafe practice and has been deprecated, always specify the service UUID). |
|
characteristicUUID |
string |
|
UUID of characteristic for descriptor. |
|
descriptorUUID |
string |
|
UUID of descriptor to read. |
|
success |
|
Success callback: success(data). |
|
|
fail |
|
Error callback: fail(error). |
readRSSI(success, fail)
Read devices RSSI. Device must be connected.
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
success |
|
Callback called with RSSI value: success(rssi). |
|
|
fail |
|
Called on error: fail(error). |
readServiceCharacteristic()
Deprecated. Use function evothings.easyble.EasyBLEDevice#readCharacteristic
- Deprecated
readServiceDescriptor()
Deprecated. Use function evothings.easyble.EasyBLEDevice#readDescriptor
- Deprecated
readServices(success, fail[, options])
Read services, characteristics and descriptors for the specified service UUIDs. Services must be read be able to access characteristics and descriptors. Call this function before reading and writing characteristics/descriptors. (This function took an array of service UUIDs as first parameter in previous versions of this library, that is still supported for backwards compatibility but has ben deprecated.)
Example
// Read all services
device.readServices(
function(device)
{
console.log('Services available.');
// Read/write/enable notifications here.
},
function(errorCode)
{
console.log('readServices error: ' + errorCode);
});
// Read specific service
device.readServices(
function(device)
{
console.log('Services available.');
// Read/write/enable notifications here.
},
function(errorCode)
{
console.log('readServices error: ' + errorCode);
},
{ serviceUUIDs: ['19b10000-e8f2-537e-4f6c-d104768a1214'] });
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
success |
|
Called when services are read: success(device) |
|
|
fail |
|
error callback: error(errorMessage) |
|
|
options |
Yes |
Optional object with setting that allow specification of which services to read. If left out, all services and related characteristics and descriptors are read (this can be time-consuming compared to reading selected services). |
writeCharacteristic(serviceUUID, characteristicUUID, value, success, fail)
Write value of characteristic.
Example
device.writeCharacteristic(
serviceUUID,
characteristicUUID,
new Uint8Array([1]), // Write byte with value 1.
function()
{
console.log('characteristic written.');
},
function(errorCode)
{
console.log('writeCharacteristic error: ' + errorCode);
});
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
serviceUUID |
string |
|
UUID of service that has the given characteristic (previous versions of this library allowed leaving out the service UUID, this is unsafe practice and has been deprecated, always specify the service UUID). |
|
characteristicUUID |
string |
|
UUID of characteristic to write to. |
|
value |
ArrayBufferView |
|
Value to write. |
|
success |
|
Success callback: success(). |
|
|
fail |
|
Error callback: fail(error). |
writeCharacteristicWithoutResponse(serviceUUID, characteristicUUID, value, success, fail)
Write value of a characteristic for a specific service without response. This faster but not as fail safe as writing with response. Asks the remote device to NOT send a confirmation message. Experimental, implemented on Android.
Example
device.writeCharacteristicWithoutResponse(
serviceUUID,
characteristicUUID,
new Uint8Array([1]), // Write byte with value 1.
function()
{
console.log('data sent.');
},
function(errorCode)
{
console.log('writeCharacteristicWithoutResponse error: ' + errorCode);
});
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
serviceUUID |
string |
|
UUID of service that has the characteristic. |
|
characteristicUUID |
string |
|
UUID of characteristic to write to. |
|
value |
ArrayBufferView |
|
Value to write. |
|
success |
|
Success callback: success(). |
|
|
fail |
|
Error callback: fail(error). |
writeDescriptor(serviceUUID, characteristicUUID, descriptorUUID, value, success, fail)
Write value of descriptor.
Example
device.writeDescriptor(
serviceUUID,
characteristicUUID,
descriptorUUID,
new Uint8Array([1]), // Write byte with value 1.
function()
{
console.log('descriptor written.');
},
function(errorCode)
{
console.log('writeDescriptor error: ' + errorCode);
});
Parameters
| Name | Type | Optional | Description |
|---|---|---|---|
|
serviceUUID |
string |
|
UUID of service that has the given characteristic (previous versions of this library allowed leaving out the service UUID, this is unsafe practice and has been deprecated, always specify the service UUID). |
|
characteristicUUID |
string |
|
UUID of characteristic for descriptor. |
|
descriptorUUID |
string |
|
UUID of descriptor to write to. |
|
value |
ArrayBufferView |
|
Value to write. |
|
success |
|
Success callback: success(). |
|
|
fail |
|
Error callback: fail(error). |
writeServiceCharacteristic()
Deprecated. Use function evothings.easyble.EasyBLEDevice#writeCharacteristic
- Deprecated
writeServiceCharacteristicWithoutResponse()
Deprecated. Use function evothings.easyble.EasyBLEDevice#writeCharacteristicWithoutResponse
- Deprecated
writeServiceDescriptor()
Deprecated. Use function evothings.easyble.EasyBLEDevice#writeDescriptor
- Deprecated


I guess your question is how you upload a platoon emblem, right? If not, please try to clarify the question a bit more. :-)
Just in case it is, below you'll find a short tutorial.
(it isn't that hard, though)
1. Go to the platoon page;
2. Hover over the emblem and press "Edit emblem" (see image 1);
3. At the right side there should be a button "CHOOSE A FILE", press it. (see image 2);
4. Choose your file.
I guess your question is how you upload a platoon emblem, right? If not, please try to clarify the question a bit more. :-)
Just in case it is, below you'll find a short tutorial.
(it isn't that hard, though)
1. Go to the platoon page;
2. Hover over the emblem and press "Edit emblem" (see image 1);
3. At the right side there should be a button "CHOOSE A FILE", press it. (see image 2);
4. Choose your file.
Hi,
I use Better BBlog 3.5.3. in Firefox (and Chrome as well) and there's somethin' wrong.
1. I check the "Platoon Image Upload" checkbox but after page refresh the checkbox becomes unchecked again.
2. There are no LOAD FILE (or whatever) button under SAVE IMAGE thus I cannot upload my own platoon emblems.


About me
My name is rowaid al sayyed obeid my birthday date is 20/2 so remember to give me a gift.
Education and working experience
- I got a bachelors degree as a Mechatronics engineer from university of jordan
- i worked as a trainer for robotics and microcontrollers courses.
I like programming so now i am taking a Full Stuck developer course at LTUC.And now i am in the 201 level.
I learned many things in these courses like HTML,CSS, Javascript, Github and Git. iam excited to go to 301 and 401 courses.
Top ten Movies
- interstellar
- inception
- Jumanji
- The hobbit
- Lord of the rings
- Mad Max: Fury Road
- Avengers: Endgame
- Coco
- Zootopia
- UP


If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Logic in Ruby Ruby provides the standard logic operators of ‘and’, ‘or’, and ‘not’ through the logical operators ‘and’, ‘or’, and ‘not’ (or if you prefer C-style, ‘&&‘, ‘||’, and ‘!’), respectively. The logical operator ‘and’ is true if, and only if, both relational (comparison) operators are true.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Comparisons in Ruby As discussed in Part 7 of this primer, Ruby provides the standard boolean values of ‘true’ and ‘false, and the standard relational (comparison) operations of is equal to, is not equal to, is greater than, is less than, is greater than or equal to, is less than or equal to through the relational operators ‘==’, ‘!=’, ‘>’, ‘<‘, ‘>=’, and ‘<=‘, respectively.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Arithmetic in Ruby As discussed in Part 6 of this primer, Ruby provides the standard arithmetic operations of addition, subtraction, multiplication, division, remainder (modulo), and exponention through the binary operators ‘+’, ‘-’, ‘*’, ‘/’, ‘%’, ‘**’, respectively.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Terms Hash: A hash is an associative collection of unique keys and their values. Ruby documentation Hashes in Ruby Ruby allows us to create dictionary-like objects, called hashes, which are associative collections of unique key-value pairs.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Terms Variable: A variable is a symbolic name associated with some value, whether known or unknown. Wikipedia article) Constant: A constant is a symbolic name associated with some known value, that is not intended to change.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Terms Array: An array is an ordered, indexed collection of objects. Ruby documentation Arrays in Ruby Ruby allows us to create ordered (but not necessarily sequenced) collections of objects, called arrays. An array contains some number of elements (objects) which are indexed using integers.
In this exercise, you will create a Ruby script to detect the minimum and maximum values from a collection of randomly generated numbers. Specification File Name: random-min-max.rb Input: Several numbers representing the minimum possible randomly generated number, the maximum possible randomly generated number, and the number of random numbers to generate. Output: Several strings containing various prompts, the results of the minimum and maximum detected values from the randomly generated numbers, and all of the randomly generated numbers for verification purposes.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Terms Numeric: A Ruby class representing a numeric data type. Ruby documentation Integer: A Ruby class representing whole number data types. Ruby documentation Float: A Ruby class representing floating point number data types. Ruby documentation Binary: A base-2 number system.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Terms Boolean: A boolean is a data type intended to represent logical truth values. Wikipedia article Comparison: A comparison is an operation that is used to test the inequality of values. Wikipedia article) Booleans in Ruby Ruby provides three boolean literals that we can use when making comparisons or in conditional expressions: true, false, and nil.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Terms Range: A range is a sequenced interval of data. Ruby documentation Ranges in Ruby Ruby allows us to create sequenced intervals of data (e.g. the integers 1 through 10) as a range object. We can create a range of any type of object in Ruby, as well as create our own custom ranges.
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Terms Data Type: A data type is a classification identifying a type of data. Wikipedia article Literal: A literal creates objects in Ruby. Ruby documentation Class: A class is a template for creating objects, and for providing initial values for state (member variables, or properties) and implementations of behavior (member fuctions, or methods).
If you have not yet set up your development environment, please refer to Part 1 of this primer. If you are unfamiliar with using the Ruby Interactive Shell, please refer to Part 3 of this primer. Terms Method: A method is a member function (collection of code statements or expressions) associated with an object, and which has access to its data and its member variables. Method Signature: A method signature is a specification for how to use a method and is given in the format method_name([arguments]) -> return_value, where [arguments] is a potentially empty array (collection) of objects to be given as parameters for the method.
In this exercise, you will create a Ruby script for a simple command line calculator. Specification File Name: simple-calculator.rb Input: Several strings containing your name, the user’s name, integers, and floats. Output: Several strings containing various prompts and the results of various arithmetic calculations. Methods Used: puts, print, gets, to_i, to_f, to_s (for floats) Sample Output Welcome to the Simple Calculator by Disciples of Code Please enter your name: Clark Kent Hello, Clark Kent Let's try some addition!
If you have not yet set up your development environment, please refer to Part 1 of this primer. Scripts? While using the Ruby Interactive Shell (IRB) to evaluate your Ruby code can be very useful for learning, debugging, and executing short statements or expressions, to create larger (and persistent) Ruby programs, you will need to store all of your Ruby code in scripts. A script is simply a plain-text file that contains your code.
If you have not yet set up your development environment, please refer to Part 1 of this primer. Using IRB The Ruby Interactive Shell, or IRB, provides a command line with which we can immediately evaluate a Ruby statement or expression. To load IRB, open a Terminal window (OS X or Linux) or a Command Prompt (Windows), and execute the following command. ``` bash Loading IRB $ irb You should now be inside IRB, and should have a command prompt similar to the following.
The first step to learning Ruby (or any programming language) is to set up your development environment, so let’s dive right in. The simplest method is to use a free, online development environment, such as those provided by Koding.com. If you have already signed up for a GitHub account (which is highly recommended for source control and for sharing your code), you can sign up for Koding.com using your GitHub account credentials.
Post by Disciples of Code.
I say ‘code’, you say ‘program’. He says ‘script’, she says ‘app’. Does it matter? Putting aside the many technical definitions and nuances, in practice these terms are nearly synonymous — at least to a general audience. What we’re really talking about is machine language, or a way of communicating with machines (e.g., computers) by combining a set of symbols, words, and statements according to certain predefined rules. Communication is more than just words, communication is architecture, because of course it is quite obvious that a house which would be built without that will, that desire to communicate, would not look the way your house looks today.
You can launch your favorite web browser and do an Internet search, and find any number of individuals and organizations offering reason after reason that learning to code is important. You can most likely find an equal number offering an opposing opinion. Of course, like with nearly all subjects of grand relevance, what this really means is that the ‘Why’ to the importance of coding, is up to you. And with any endeavor, the end result and polished nature of the output is nowhere near as significant as the attitude and approach of the individual undertaking the task.
So you are ready to begin your journey and learn to code, but you don’t know where to begin. Of course, information is free, for those willing to find it, but not all information is as valuable or worthwhile when you are just starting out. At this point, you can’t tell bad code from good. You have no idea whether you should start out by thumbing through some massive tome of seemingly arcane jargon in an attempt to glean some tidbit of understanding, or simply fire up your trusty Internet search engine and dive in head-first.
Thank you for checking out Disciples of Code. Much more content coming soon. Stay tuned!


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The vSphere API supports Microsoft Active Directory management of authentication for ESX hosts. To integrate an ESX host into an Active Directory environment, you use an Active Directory account that has the authority to add a computer to a domain. The ESX Server locates the Active Directory domain controller. When you add a host to a domain, you only need to specify the domain and the account user name and password.
There are two approaches that you can use to add an ESX host to or remove a host from an Active Directory domain.
To take advantage of ESX host membership in an Active Directory domain, grant permissions on the ESX host to Active Directory users and groups who should have direct access to management of the ESX host. Use the UserDirectory.RetrieveUserGroups method to obtain information about Active Directory users and groups. After retrieving the Active Directory data, you can use the AuthorizationManager.SetEntityPermissions method to set the principal property to the appropriate user or group.
By default, the ESX host assigns the Administrator role to the "ESX Admins" group. If the group does not exist when the host joins the domain, the host will not assign the role. In this case, you must create the "ESX Admins" group in the Active Directory. The host will periodically check the domain controller for the group and will assign the role when the group exists.
Properties
| Name | Type | Description |
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| info | HostAuthenticationManagerInfo |
Information about Active Directory membership.
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| supportedStore | ManagedObjectReference[]
to a HostAuthenticationStore[] |
An array that can contain managed object references to local and
Active Directory authentication managed objects.
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Methods
| Methods defined in this Managed Object |
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