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INTSAMPLES-55 - Update README.md for OddEven Sample

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For reference: https://jira.springsource.org/browse/INTSAMPLES-55

* Update README.md to reflect correct classes
* Improve documentation
* Add Maven Exec Maven Plugin for easy execution from the command line
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Gunnar Hillert
2012-02-10 15:39:39 -05:00
parent 9d14c3f0b2
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Odd Even Sample
===============
This example demonstrates the following aspects of the CORE EIP support available with Spring Integration:
This project contains the following 2 sample applications:
1. Inbound Channel Adapter
2. Filter
3. Router (SpEL based)
4. Poller with Cron and Interval Trigers
* CronOddEvenDemo
* IntervalOddEvenDemoTestApp
Messages are simply being emitted by the Poller (interval based or cron) triggering '**next()**' method of Counter class and sent to a '**numbers**' channel - Inbound Channel Adapter. From the '**numbers**' channel Messages are sent to an expression-based router (Spring Expression Language). All that the router does is simply routing messages to *OddLogger* and *EvenLogger* service
## CronOddEvenDemo
To execute the Interval-based sample simply run **IntervalOddEvenDemoTest** class and for Cron-based sample simply
run CronOddEvenDemo class, You should see the output similar to this:
This example demonstrates the following aspects of the core Enterprise Integration Patterns (EIP) support available with Spring Integration:
INFO : org.springframework.integration.samples.oddeven.OddLogger - odd: 1 at 2010-09-16 05:55:46
INFO : org.springframework.integration.samples.oddeven.EvenLogger - even: 2 at 2010-09-16 05:55:49
INFO : org.springframework.integration.samples.oddeven.OddLogger - odd: 3 at 2010-09-16 05:55:52
INFO : org.springframework.integration.samples.oddeven.EvenLogger - even: 4 at 2010-09-16 05:55:55
* Inbound Channel Adapter
* Poller with Cron Trigger
* Filter
* Router (SpEL based)
* Service Activator
Messages are simply being emitted by the **Poller** (**Cron-based**) through triggering the **next()** method of the *org.springframework.integration.samples.oddeven.Counter* class. The messages are sent via the **numbers** channel to a *Spring Expression Language* (SpEL) based **Message Filter**. The filter discards any messages that contain a payload whose value is less than the number one (1).
Via the **positives** channel messages are sent to the a SpEL expression-based router. All that the router does is to simply route messages to one of the following two **Service Activators**:
* OddLogger
* EvenLogger
## IntervalOddEvenDemoTestApp
Demonstrates a method-invoking **Inbound Channel Adapter** acting as a **Polling Consumer** with an **Interval-based trigger**. That adapter is followed, downstream, by a Content Based **Router**. The router sends to one of two channels based on whether the payload number is odd or even. Each of those two channels has an **Event Driven Consumer** ready to log the number and the current time.
The following Spring Integration components are being used:
* Inbound Channel Adapter
* Poller with Fixed Delay Trigger
* Router (SpEL based)
* Service Activator
## Running the Samples
To run the two samples, simply execute either **CronOddEvenDemo** or **IntervalOddEvenDemoTestApp** in package **org.springframework.integration.samples.oddeven**. You can also execute those two samples using the [Exec Maven Plugin](http://mojo.codehaus.org/exec-maven-plugin/):
$ mvn clean package exec:java -P cron
which will execute **CronOddEvenDemo**. In order to run **IntervalOddEvenDemoTestApp**, execute:
$ mvn clean package exec:java -P interval
For both samples you should see the output similar to this:
INFO : org.springframework.integration.samples.oddeven.OddLogger - odd: 1 at 2012-02-10 03:29:32
INFO : org.springframework.integration.samples.oddeven.EvenLogger - even: 2 at 2012-02-10 03:29:35
INFO : org.springframework.integration.samples.oddeven.OddLogger - odd: 3 at 2012-02-10 03:29:38
INFO : org.springframework.integration.samples.oddeven.EvenLogger - even: 4 at 2012-02-10 03:29:41