#jsr356

[abhishek1987-blog]

Accessing HTTP Session in WebSocket endpoint

Accessing HTTP Session in WebSocket endpoint

It’s possible to obtain a reference to the HttpSession within a WebSocket application using a custom implementation of ServerEndpointConfig.Configurator

Here is an example application on Github

Steps…

Override the modifyHandshakeRequest method

call the getHttpSession method on the HandshakeRequest object which is passed into the method by the WebSocket runtime

store it– one possible option is to…

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[abhishek1987-blog]

Handling 'state' in Java WebSocket applications

Handling ‘state’ in Java WebSocket applications

By and large, there are two kinds of states in a WebSocket application

User/client specific: related to a connected user/Session e.g. user ID, list of subscriptions, last message received etc.

Global: state which is relevant across your application and something which all connected users/Sessions might be able to use

User specific state

This can be handled using getUserProperties method on the S…

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[abhishek1987-blog]

Github: WebSocket applications...

Github: WebSocket applications…

I recently pushed a couple of WebSocket samples to Github. Both are based around the notion of a chat service – a canonical WebSocket example! These were originally meant to serve as additional material to the Java WebSocket API Handbook in order for readers to understand API usage in practical and also get hands-on  by tinkering with the code

websocket-chat: Basic chat application

websocket-chat…

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[abhishek1987-blog]

Using Asynchronous timeouts in the Java WebSocket API

Using Asynchronous timeouts in the Java WebSocket API

Sending messages in an asynchronous manner avoid blocking the sending thread. This is a great where your solution needs to scale in order to support a large number of clients.

But there is a limit on how long can we wait for the asynchronous process to complete

The Java WebSocket API gives you a few options in this regard

Async Timeout support

first and foremost, there is a notion of a timeoutand…

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[abhishek1987-blog]

Configuring WebSocket server endpoints

Configuring WebSocket server endpoints

WebSocket Server endpoint configuration

Before we dive into the details, here is a quick snapshot of the related interfaces

Class/Interface Description ServerEndpointConfig A derivative of EndpointConfig interface which is specific for configuration related to server side WebSocket endpoints ServerEndpointConfig.ConfiguratorAn interface whose custom implementation allows sharing of…

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[abhishek1987-blog]

Deploying WebSocket annotated & programmatic server endpoints together

Deploying WebSocket annotated & programmatic server endpoints together

One of my previous blog post discussed Programmatic WebSocket endpoints and their deployment methodology using the javax.server.ServerApplicationConfig class.

When annotated and programmatic endpoints co-exist…

you have to make use of the a custom implementation of ServerApplicationConfig and explicitly return set of all annotated endpoints from the getAnnotatedEndpointClasses method

Please note…

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[abhishek1987-blog]

Just a follow up on WebSocket API issue with Tyrus (on GlassFish)

Follow up on the WebSocket API issue with Tyrus (on GlassFish). I initially reported this under Glassfish 4 – details. This has been appropriately filed under TYRUS – link and should hopefully be resolved soon.

Thanks to Pavel Bucek !

Cheers!

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[abhishek1987-blog]

Websocket API issues during XML payload transmission via getSendWriter() handle

Facing weird issues with the WebSocket API

Use Case: Trying to send a XML payload back to the remote client using the java.io.Writer handle provided by the getSendWriter() method in RemoteEndpoint.Basic interface

Code snippet below

  SampleModel is just a POJO (the complete code has been omitted)

  Scenario 1 - GlassFish 4.0

Tested the WS endpoint behavior via simple JavaScript – just printing…

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