Odd Even Sample

This project contains the following 2 sample applications:

CronOddEvenDemo
IntervalOddEvenDemoTestApp

CronOddEvenDemo

This example demonstrates the following aspects of the core Enterprise Integration Patterns (EIP) support available with Spring Integration:

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. Every 5th number generated by the Counter class will be negative. 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 Gradle Application Plugin:

$ gradlew :oddeven:runCronOddEvenDemo

which will execute CronOddEvenDemo. In order to run IntervalOddEvenDemoTestApp, execute:

$ gradlew :oddeven:runIntervalOddEvenDemoTestApp

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