Triggers

https://help.sap.com/viewer/3fb5dcdfe37f40edbac7098ed40442c0/1808/en-US/ca2cdc04d69e46f0b507296574d6b083.html

Triggers

With your business logic successfully factored into a job class, you can trigger its execution with the use of a cron job.

A cron job consists of the job class containing the business logic, and a trigger to start the job at regular intervals. The first step in setting up a new cron job is to notify SAP Commerce of your new class by creating your essential data. During the creation of essential data, a ServicelayerJob item is created for every Spring definition that has a class implementing the JobPerformable interface. The code attribute of each of the new job item is set to the name of the relevant Spring bean.

Once a ServicelayerJob item is created, you can create a cron job to wrap the ServicelayerJob, and define a trigger to that starts it.

A cron expression is a string comprised of 6 or 7 fields separated by white space. Fields can contain any of the allowed values, along with various combinations of allowed special characters for that field.

Field Name	Mandatory	Allowed Values	Allowed Special Characters
Seconds	YES	0-59	, - * /
Minutes	YES	0-59	, - * /
Hours	YES	0-23	, - * /
Day of week	YES	1-7 or SUN-SAT	, - * ? / L #
Day of month	YES	31-Jan	, - * ? / L W
Month	YES	1-12 or JAN-DEC	, - * /
Year	NO	empty, 1970-2099	, - * /

The first cron job you create for your extension runs on a daily basis, and sends out summaries of new items by email to a specific email address or distribution list. Then you create a second cron job using a scripting language instead of a Java class. Using a scripting language, you can add cron jobs to a system without having to rebuild and redeploy it.

https://docs.oracle.com/cd/E12058_01/doc/doc.1014/e12030/cron_expressions.htm

A Cron Expressions

Cron expressions are used to configure instances of CronTrigger, a subclass of org.quartz.Trigger. A cron expression is a string consisting of six or seven subexpressions (fields) that describe individual details of the schedule.

These fields, separated by white space, can contain any of the allowed values with various combinations of the allowed characters for that field. Table A-1 shows the fields in the expected order.

Table A-1 Cron Expressions Allowed Fields and Values

Name	Required	Allowed Values	Allowed Special Characters
Seconds	Y	0-59	, - * /
Minutes	Y	0-59	, - * /
Hours	Y	0-23	, - * /
Day of month	Y	1-31	, - * ? / L W C
Month	Y	0-11 or JAN-DEC	, - * /
Day of week	Y	1-7 or SUN-SAT	, - * ? / L C #
Year	N	empty or 1970-2099	, - * /

Example A-1 Cron Expressions

Cron expressions can be as simple as * * * * ? * or as complex as 0 0/5 14,18,3-39,52 ? JAN,MAR,SEP MON-FRI 2002-2010.

Here are some more examples:

Expression	Means
0 0 12 * * ?	Fire at 12:00 PM (noon) every day
0 15 10 ? * *	Fire at 10:15 AM every day
0 15 10 * * ?	Fire at 10:15 AM every day
0 15 10 * * ? *	Fire at 10:15 AM every day
0 15 10 * * ? 2005	Fire at 10:15 AM every day during the year 2005
0 * 14 * * ?	Fire every minute starting at 2:00 PM and ending at 2:59 PM, every day
0 0/5 14 * * ?	Fire every 5 minutes starting at 2:00 PM and ending at 2:55 PM, every day
0 0/5 14,18 * * ?	Fire every 5 minutes starting at 2:00 PM and ending at 2:55 PM, AND fire every 5 minutes starting at 6:00 PM and ending at 6:55 PM, every day
0 0-5 14 * * ?	Fire every minute starting at 2:00 PM and ending at 2:05 PM, every day
0 10,44 14 ? 3 WED	Fire at 2:10 PM and at 2:44 PM every Wednesday in the month of March
0 15 10 ? * MON-FRI	Fire at 10:15 AM every Monday, Tuesday, Wednesday, Thursday and Friday
0 15 10 15 * ?	Fire at 10:15 AM on the 15th day of every month
0 15 10 L * ?	Fire at 10:15 AM on the last day of every month
0 15 10 ? * 6L	Fire at 10:15 AM on the last Friday of every month
0 15 10 ? * 6L	Fire at 10:15 AM on the last Friday of every month
0 15 10 ? * 6L 2002-2005	Fire at 10:15 AM on every last friday of every month during the years 2002, 2003, 2004, and 2005
0 15 10 ? * 6#3	Fire at 10:15 AM on the third Friday of every month
0 0 12 1/5 * ?	Fire at 12 PM (noon) every 5 days every month, starting on the first day of the month
0 11 11 11 11 ?	Fire every November 11 at 11:11 AM