THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Overview of the Basic Example
This document describes how the Basic example is used and provides details about what it does.
The source code for the Basic example is stored in the Service Mix installation directory under the examples\basic directory in the servicemix.xml file. Note: It is helpful to look at the source code while
reading this description.
The Basic example illustrates the following concepts:
- use of declarative programming
- how to use an ActiveMQ message broker
- how to use a Quartz timer
- how to use the jencks JCA container
- how to use a transaction manager
- how to using tracing
The example has several components. One component sets off a timer to send messages to a source destination. Then those messages are consumed by another component and sent to a different output destination - along with a trace component displaying the output messages as they arrive. This demonstrates a simple JMS bridge in action along with timers and tracing.
The diagram illustrates the components of the Basic example and how they interact with each other within the JBI container.
A DIAGRAM WILL BE PUT HERE--still creating
The following table explains the basic function of each component and bean in the servicemix.xml file.
Component or Bean ID |
Description |
|---|---|
jbi |
The jbi container contains the following components: timer, inputSender, inputReceiver, outputSender, jmsTrace, and trace. First the servicemix.xml file initializes the jbi container by setting several properties. Then the components are run. Note: During the initialization, a bean called "transactionManager" is instantiated. The transactionManager provides the connectivity between the JMS messaging system and the jbi container. |
timer |
Every 5 seconds, until the program is terminated, the timer component kicks off a trigger. The job has a property called "name" with a value of "My Example Job" and another property called "group" with a value of "ServiceMix." The trigger is converted to a normalized message and routed through the Normalized Message Router (NMR). |
inputSender |
Receives the normalized message (the trigger), converts it to a JMS message, and publishes it to the topic called demo.org.servicemix.source. |
inputReceiver |
This component uses the bean called jencks , which is a JCA container, to listen on port 61616 for a JMS message on the topic called "demo.org.servicemix.source." Essentially, inputReceiver subscribes to the demo.org.servicemix.source topic. It takes the message, normalizes it, and routes it to outputSender via the NMR. This component combined with outputSender and some supporting beans creates a JMS bridge between two topics. |
outputSender |
This component receives a normalized message from the NMR, marshals it into a JMS message using jmsTemplate, then publishes it on the ActiveMQ (JMS) topic called "demo.org.servicemix.result." |
jmsTrace |
This component uses the jencks bean to subscribe to the "demo.org.servicemix.result" topic and get the message that is there. It then marshals the message into a Normalized Message and routes it via the NMR to the trace component. |
jmsTrace |
This component uses jencks to listen to port 61616 for the purposes of tracing the messages received on that port. |
trace |
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jencks |
The jencks bean defines a JCA container. This bean has two properties, one of which is an ActiveMQ listener, which listens on port 61616. In general a JCA container must provide threading, The JCA |
broker |
The broker bean ... |
transactionManager |
This bean is invoked in the jbi containers initialization. It instantiates the |
jmsFactory |
This bean listens on port 61616. |
When running the Basic example, the typical output looks like the following. Note, that the triggers property values of "name", "My Example Job", "group", and "ServiceMix" are displayed along with a timestamp.
PUT PIC of OUTPUT HERE.
Interesting Details
Perhaps I should have a section that might describe in more detail some important but subtle
aspect of the XML code. Will need input from developers. This section may not be applicable to
all examples.
Running the Basic Example
To run Basic:
From a command shell, go to the Basic example directory:
cd [servicemix_install_dir]\examples\basic
To run it:
[servicemix_install_dir]\bin\servicemix servicemix.xml
where servicemix_install_dir is the location in which Service Mix was installed.
Stopping the Basic Example
To terminate the Basic example type "CTRL-C" in the command shell in which it is running.
Related Documentation
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