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+ + + + + + + + + + + + + + +

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ActiveMQ + title="The most popular and powerful open source Message Broker">ActiveMQ ASF -

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+ href="http://www.apache.org/" title="The Apache Software Foundation">ASF +

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Chat Example

@@ -111,109 +104,109 @@

Welcome to the Ajax chat example

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+ + +

- This Chat example creates an ActiveMQ broker using the configuration - information found in the web.xml file. There isn't much there. - Just a name-value parameter named org.apache.activemq.brokerURL - is assigned a value of vm://localhost?broker.persistent=false. - This is enough however to lazy-initialize the broker when it is needed. + This Chat example creates an ActiveMQ broker using the configuration + information found in the web.xml file. There isn't much there. + Just a name-value parameter named org.apache.activemq.brokerURL + is assigned a value of vm://localhost?broker.persistent=false. + This is enough however to lazy-initialize the broker when it is needed.

- The client leverages a javascript library amq.js to perform all - of the JMS-related client side code. This involves establishing a - communication pipeline to the JMS server. This pipeline uses a long-poll - connection to the server. All JMS communication will be received down this - pipe, and when the JMS server has no traffic to send, this pipeline will - patiently wait until there is new traffic or until it times out. If a - timeout does occur, the connection will reconnect to the server for another - round. (Of course you will want/need to use a server that supports - continuations in order for this to scale beyond a few hundred clients.) + The client leverages a javascript library amq.js to perform all + of the JMS-related client side code. This involves establishing a + communication pipeline to the JMS server. This pipeline uses a long-poll + connection to the server. All JMS communication will be received down this + pipe, and when the JMS server has no traffic to send, this pipeline will + patiently wait until there is new traffic or until it times out. If a + timeout does occur, the connection will reconnect to the server for another + round. (Of course you will want/need to use a server that supports + continuations in order for this to scale beyond a few hundred clients.)

- The chat.js file contains the script to respond to the UI - interactions. It also talks to the amq.js file to send messages - and provides a message handler that will respond to incoming JMS messages. + The chat.js file contains the script to respond to the UI + interactions. It also talks to the amq.js file to send messages + and provides a message handler that will respond to incoming JMS messages.

- There is no server-side state in this application. The client sets up a JMS - Topic on the server and attaches itself as a listener to this topic. From - that point, all messages that are sent to the topic are received by each - listener. Even the list of members in the chat room are the result of - clients replying to a ping request. + There is no server-side state in this application. The client sets up a JMS + Topic on the server and attaches itself as a listener to this topic. From + that point, all messages that are sent to the topic are received by each + listener. Even the list of members in the chat room are the result of + clients replying to a ping request.

- Please note that amq.js has been refactored to allow AJAX calls - to be made using any javascript library. Example adapter classes for jQuery - and Prototype have been provided. + Please note that amq.js has been refactored to allow AJAX calls + to be made using any javascript library. Example adapter classes for jQuery + and Prototype have been provided.

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Graphic Design By Hiram

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Chat Example

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ActiveMQ Web Demos

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