This example demonstrates the following aspects of the JMX support available with Spring Integration:

1. JMX Attribute Polling Channel
2. JMX Operation Invoking Channel Adapter

StopWatch is a Managed Bean. It is bootstraped and deployed using annotation support (@Component, @ManagedResource) and component scanning functionality provided by Spring JMX. Internally StopWatch simply runs a task that increments the value of its seconds attribute by 1 every second.

The JMX Attribute Polling Channel Adapter simply polls a managed attribute seconds of the StopWatch MBean identified by the name:

org.springframework.integration.samples.jmx:type=StopWatch,name=stopWatch

It sends its value to a seconds channel. The interesting part is that the seconds channel is a publish-subscribe-channel and has two subscribers:

• Stdout Channel Adapter which prints the value of the polled attribute to the console
• Filter which essentially waits till the payload value is 10

Once the payload value is 10, the filter sends the Message to a reset channel, which is represented as JMX Operation Invoking Channel Adapter. That adapter simply invokes the reset operation on the same StopWatch MBean resetting the seconds attribute value back to 1 and the process repeats.

To run the JMX Adapter sample simply execute JmxAdapterDemoTest. You will see output similar to this, which will loop for ~20 seconds:

1
2
3
4
5
6
7
8
9
10
1
2
3
. . .