ESB CEP support for multiple event streams
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Key: JBESB-3396
URL:
https://jira.jboss.org/browse/JBESB-3396
Project: JBoss ESB
Issue Type: Feature Request
Security Level: Public (Everyone can see)
Components: Configuration, Content Based Routing, Documentation, Examples
Affects Versions: 4.9
Reporter: David Ward
Assignee: David Ward
Fix For: 4.9 CP1
CEP applications often are designed to correlate messages from multiple event streams. A
common example (used often the Drools CEP presentations and documentation) is a Online
Trading System, which has a "Home Broker Stream" and a "Stock Trader
Stream".
An Enterprise Service Bus such as JBoss ESB can provide a good architecture to support
this type of CEP application. The developer could create three ESB Serivces. The first
would create the Drool stateful knowledge session (and somehow publish this object to make
it available for the other services), insert static facts, and call fireUntilHalt. The
second service would represent the Home Broker Stream. It would receive trade requests
from the Home Broker (say via a SOAP message), transform the XML into Java BuyOrderEvent
objects, and insert these events into the stateful knowledge session via the Home Broker
Stream entry point. The third service would be similar to the second service, except that
it would handle messages from the Stock Trader, which for the sake of this example, come
in as XML via a JMS transport, get transformed into Java BuyAckEvent objects and inserted
into the session via the Stock Trader Stream entry point.
The rationale for having multiple services is to be able to handle different protocols and
perform different transformations.
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