Flex Data Services(FDS): FMS

FDS enables you to access and synchronize data across one or more applications built with Flex framework. FDS itself is a server-side java app designed to work with most Java app servers. FDS consists of four parts:

• Flex Message Service (FMS)
  
• Flex Data Management Service (FDMS)
  
• Flex Proxy Service (FPS)
  
• Remoting Service
  

FMS helps to build apps that support real-time chat and collaboration. Idea is to update app whenever server side data changes. In this article let us see how we can use FMS Java API (MessageBroker, AsyncMessage) to receive message in Flex.

1. Take the FDS blank application as your starting point

2. Open WEB-INF/flex/messaging-config.xml and add this destination node below default-adapter node:Destination Node Code

3. Define message consumer in MXML

<mx:Consumer id="consumer" destination="feed" message="messageHandler(event.message)"/>

4. Subscribe/Unsubscribe to message at desired part of the flex code as:

consumer.subscribe();
consumer.unsubscribe();

5. Whenever there is a message generated at the backend, now your flex application will hear it. A very simple sample java file that generates message will look like this:

Sample Java Message Generator