Package org.oddjob.state.expr

Class StateExpressionType

java.lang.Object
org.oddjob.state.expr.StateExpressionType
All Implemented Interfaces:
ArooaSessionAware, EventSource<InstantEvent<Boolean>>, InstantEventSource<Boolean>
public class StateExpressionType extends Object implements InstantEventSource<Boolean>, ArooaSessionAware
Author:
rob

Description

Evaluate a state expression that becomes an event source for triggering other jobs. used with Trigger and When.

Expressions are of the form: 

 [NOT] job-id IS job-condition

And can be chained with AND and OR and nested with parenthesis. Examples are: 

 		job1 is success
 		not job1 is success
 		job1 is success or ( job2 is success and job3 is success)

Example

Runs a job when two other jobs complete, but only if one of the jobs hasn't been run. 
<oddjob>

    <job>

        <sequential>

            <jobs>

                <events:when id="when" xmlns:events="oddjob:events">

                    <jobs>

                        <events:watch name="Watch Jobs 1 and 2">

                            <eventSource>

                                <state:watch xmlns:state="http://rgordon.co.uk/oddjob/state">

                                    job1 is COMPLETE 

AND 

job2 is COMPLETE



                                </state:watch>

                            </eventSource>

                        </events:watch>

                        <state:if xmlns:state="http://rgordon.co.uk/oddjob/state">

                            <jobs>

                                <sequential>

                                    <jobs>

                                        <state:evaluate id="check-job3" name="Is Job 3 Complete">

                                            job3 is complete

                                        </state:evaluate>

                                        <check gt="${check-job3.evaluation.time}" value="${when.trigger.time}"/>

                                    </jobs>

                                </sequential>

                                <state:flag/>

                                <run job="${job3}" name="Run Job 3"/>

                            </jobs>

                        </state:if>

                    </jobs>

                </events:when>

                <folder>

                    <jobs>

                        <echo id="job1" name="Job 1">

                            Hello

                        </echo>

                        <echo id="job2" name="Job 2">

                            World

                        </echo>

                        <echo id="job3" name="Job 3">

                            It's Done!

                        </echo>

                    </jobs>

                </folder>

            </jobs>

        </sequential>

    </job>

</oddjob>