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Merge pull request #30 from ghillert/INTSAMPLES-42

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INTSAMPLES-42 - Convert all ReadMe files to MarkDown
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Gary Russell
2012-01-18 07:57:28 -08:00
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basic/jmx/README.md Normal file
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JMX Sample
==========
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:
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basic/jmx/readme.txt
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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.
JMX Attribute Polling Channel Adapter simply polls a managed attribute 'Seconds' of the StopWatch MBean identified by the 'org.springframework.integration.samples.jmx:type=StopWatch,name=stopWatch' name and sends its value to a 'seconds' channel.
The interesting this is that '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 payload value is 10;
Once the payload value is 10 filter sends the Message to a 'reset' channel which is represented as JMX Operation Invoking Channel Adapter
which simply invokes 'reset' operation on the same StopWatch MBean resetting 'Seconds' attribute value back to 1 and the process repeats.
To run JMX Adapter sample simple execute JmxAdapterDemoTest
You will see the output similar to this which will loop for ~ 20 sec:
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9
10
1
2
3
. . .