Waiting for a file to arrive before a job can start processing it is the most common and quintessential requirement for any workload automation tool. Historically, this was done by creating a File dependency using OPENS and Unix tricks to manage wild cards and multiple matching files. Then Event Driven Workload Automation was introduced where an Event Rule could monitor a file with wild cards and when the condition was satisfied the dependent Job Stream was submitted. With the advent of the Start Condition feature introduced in version 9.4 Fix Pack 1, the event rule file monitor capability is integrated into a Job Stream using the utility, filemonitor. Another important aspect of this requirement is to pass the name of the matching file to another job in the workflow to process the data contained in the file. This article explores this feature and also uses an internal variable, ListOfFilesFound, to pass the name of the matching file to a successive job in the same Job Stream. How to use the Start Condition feature with File Created Follow the steps below to create a Start Condition for a Job Stream
6. Select Create New à Job Definition à UNIX 7. In the General tab, fill in the Job name, Workstation, and Login 8. In the Task tab, enter the following Script name: /bin/echo "File Monitored: ${job:FILE_CREATED.ListOfFilesFound}" 9. Click on Save 10. Select Create New à Job Definition à UNIX 11. In the General tab, fill in the Job name, Workstation, and Login 12. In the Task tab, enter the following Script name: cat /tmp/start.cond.out.txt 13. Click on Save 14. Add the two jobs created earlier to the Job Stream 15. Click on Save 16. The following is the Job Stream definition is composer format. SCHEDULE EEL#START_COND_JS STARTCOND FILECREATED EEL#"/tmp/start.cond.*.txt" INTERVAL 60 ( ALIAS FILE_CREATED RERUN OUTFILE "/tmp/start.cond.out.txt" ) : EEL#FILE_NAME_FROM_VARIABLE SCRIPTNAME "/bin/echo \"File Monitored: ${job:FILE_CREATED.ListOfFilesFound}\"" STREAMLOGON iwadmin DESCRIPTION "Retrieve file name in Start Cond from an internal variable, ListOfFilesFound" TASKTYPE UNIX RECOVERY STOP EEL#FILE_NAME_FROM_OUTPUT_FILE SCRIPTNAME "cat /tmp/start.cond.out.txt" STREAMLOGON iwadmin DESCRIPTION "Retrieve file name in Start Cond from the Output file field" TASKTYPE UNIX RECOVERY STOP FOLLOWS FILE_NAME_FROM_VARIABLE END 17. Select the Job Stream Name and choose Select an Action à Submit Job Stream into Current Plan Monitor the Status of Job Stream with the Start Condition and File Created Follow the steps below to monitor the status of the Job Stream
RESTART_STARTCOND Auto generated job to submit the Job Stream FILE_NAME_FROM_VARIABLE Job to retrieve the matching file from a variable FILE_NAME_FROM_OUTPUT_FILE Job to retrieve the matching file from an output file 7. Left click on the Job, FILE_CREATED, to view its properties. Click on Extra Properties tab to view the internal variable that stores the name of the matching file. 8. Right click on the Job, FILE_NAME_FROM_VARIABLE, and choose Job Log. Notice that the name of the matching file is retrieved from the internal variable, ListOfFilesFound, set by the job, FILE_CREATED, ${job:FILE_CREATED.ListOfFilesFound}. File Monitored: /tmp/start.cond.092920201352.txt 9. Right click on the Job, FILE_NAME_FROM_OUTPUT_FILE, and choose Job Log. Notice that the name of the matching file is retrieved from the file name specified in the Output file field, cat /tmp/start.cond.out.txt /tmp/start.cond.092920201352.txt How to use the Start Condition feature with File Modified Follow the steps below to create a Start Condition for a Job Stream
6. Select Create New à Job Definition à UNIX 7. In the General tab, fill in the Job name, Workstation, and Login 8. In the Task tab, enter the following Script name: /bin/echo "File Monitored: ${job:FILE_MODIFIED.ListOfFilesFound}" 9. Click on Save 10. Select Create New à Job Definition à UNIX 11. In the General tab, fill in the Job name, Workstation, and Login 12. In the Task tab, enter the following Script name: cat /tmp/startcond.out 13. Click on Save 14. Add the two jobs created earlier to the Job Stream 15. Click on Save 16. The following is the Job Stream definition is composer format. SCHEDULE EEL#START_COND_JS STARTCOND FILEMODIFIED EEL#"/tmp/start.cond.*.txt" INTERVAL 60 ( ALIAS FILE_MODIFIED RERUN PARAMS "-modificationCompletedTime 120" OUTFILE "/tmp/startcond.out" ) : EEL#FILE_NAME_FROM_VARIABLE SCRIPTNAME "/bin/echo \"File Monitored: ${job:FILE_MODIFIED.ListOfFilesFound}\"" STREAMLOGON iwadmin DESCRIPTION "Retrieve file name in Start Cond from an internal variable, ListOfFilesFound" TASKTYPE UNIX RECOVERY STOP EEL#FILE_NAME_FROM_OUTPUT_FILE SCRIPTNAME "cat /tmp/startcond.out" STREAMLOGON iwadmin DESCRIPTION "Retrieve file name in Start Cond from the Output file field" TASKTYPE UNIX RECOVERY STOP FOLLOWS FILE_NAME_FROM_VARIABLE END 17. Select the Job Stream Name and choose Select an Action à Submit Job Stream into Current Plan Monitor the Status of Job Stream with the Start Condition with File Modified Follow the steps below to monitor the status of the Job Stream
RESTART_STARTCOND Auto generated job to submit the Job Stream FILE_NAME_FROM_VARIABLE Job to retrieve the matching file from a variable FILE_NAME_FROM_OUTPUT_FILE Job to retrieve the matching file from an output file 7. Left click on the Job, FILE_CREATED, to view its properties. Click on Extra Properties tab to view the internal variable that stores the name of the matching file. 8. Right click on the Job, FILE_NAME_FROM_VARIABLE, and choose Job Log. Notice that the name of the matching file is retrieved from the internal variable, ListOfFilesFound, set by the job, FILE_CREATED, ${job:FILE_MODIFIED.ListOfFilesFound}. File Monitored: /tmp/start.cond.092920201352.txt 9. Right click on the Job, FILE_NAME_FROM_OUTPUT_FILE, and choose Job Log. Notice that the name of the matching file is retrieved from the file name specified in the Output file field, cat /tmp/start.cond.out.txt /tmp/start.cond.092920201352.txt Want to learn more? Write me at Sajjad.Kabir@hcl.com or schedule a demo. Author's Bio
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