Flash® Builder™ 4 and Flex® 4 Bible

Chapter 27. Using the Message Service with BlazeDS

IN THIS CHAPTER

• Understanding the Message Service

• Configuring messaging on the server

• Using adapters, channels, and destinations

• Creating Flex messaging applications

• Using producers and consumers

• Sending and receiving simple messages

• Working with complex messages

• Filtering messages on the server

• Debugging message traffic

When Flex Data Services 2 was first released, one of its most compellingnew features was known as the Flex Message Service. This service enabled developers to create applications in whichdata and information could be shared instantly between multiple connected client applications without having to program with low-level socket-style application programming interfaces (APIs).

When Flex Data Services was renamed LiveCycle Data Services, this serverbasedfunction became known simply as the Message Service (or, when referred to in the context of BlazeDS, the BlazeDS Message Service). Using this service, Flex client applications send messages to a destination on the server. The server then distributes the messages to other connected clients over a supported communication protocol.

LiveCycle Data Services (referred to here simply as LCDS) supports the Real Time Messaging Protocol (RTMP), a protocol that implements true server-push capability. When LCDS Message Service destinations use an RTMP channel, data is pushed from the server to connected clients instantly (or as close as possible, given available network and server resources). ...