Persistent Variables (4.0)
- Jenni Wallin
Note!
This section is only relevant for Python agents in batch workflows.
Persistent variables are variables that are persisted after the endBatch function block has been executed for the processing agent, or after the endBatch() function has been called for the collection agent. They are read from the persistence store just before the initialize block is executed.
Use persistent variables if you have any transaction state that must be available in the commit or rollback function blocks to finalize a transaction.
A persistent variable must be defined as a global variable. You can specify a default value in the constructor, otherwise the default value is None. A persistent variable has the property value, which you use to get or set the persistent variable value.
The value of a persistent variable must be compatible with drany. For further information, see APL and Ultra Field Types for Python (3.3).
Note!
A persistent variable is not the same as a normal Python global variable. A normal global variable is not persisted between executions of a workflow. Do not rely on normal global variables for any state necessary to finalize a transaction.