Page History

Events

Question: How can I wait for an event in a job chain?

Introduction

In some cases it is necessary to wait for an event before proceeding with execution.

...

1. setting up a job to create the event. This is a stand alone job.
2. setting up a job chain with a wait step in the middle. When the event arrives, the execution proceeds and the event will be deleted.
3. setting up the jobs for deleting and checking the event.

Requirements

The JobScheduler must run using a database. The events are stored permanently in the table "SCHEDULER_EVENTS".

Instructions

• Unzip all files of test_event.zip into the ./config folder of your active instance of the eventservice JobScheduler installation. After unzipping you will have all the objects needed to run the example in the live/test_events subfolder.
• Open the JS operations gui for the workload JobScheduler in your browser using http://scheduler_host:scheduler_port
• Find the test_event/job chain_example_wait_for_event job chain and click on it.
• Click in the job chain menu on "add order"
• You see the order will run until the step 3 is reached. As the EVENT event does not exist, the order will wait for 10s and then check again.
• Switch to the tab Jobs.
• Find the test_event/job_event_add job chain and click on it.
• In the Job menu press Start task immediately. This will create the EVENT event.
• Switch to the tab Job Chains.
• See the order proceeding with execution of the next step

How it works

The test_event/job_event_add job is a dummy shell script job with a post processing part. In the post processing the com.sos.jitl.eventing.EventMonitorTaskAfter JITL class is used to add an TEST.TEST_EVENT event.

...

You also can specify how to handle the existing or not existing of events with the paramters handle_existing_ah1. as="error|success" or handle_not_existing_as="error|success"

example

 handle_existing_as=error will wait until the events do not exist

...

After adding the event, the order will proceed with to the next step and the event will be removed.

Related Downloads

...

• scheduler events - Documentation

...