Using Business Interlink with Application Engine

In a regular PeopleCode program, you can only declare a Business Interlink object as local. However, in an Application Engine program, you can declare a Business Interlink object as global. Instantiating a Business Interlink object once as a global saves on the significant overhead of reinstantiating a local object for every iteration of PeopleCode called in a loop.

• Global Business Interlink objects can only be used in Application Engine PeopleCode programs because PeopleCode that runs on an application server must be stateless.

• When a restartable Application Engine program abends, global Business Interlink objects that were instantiated before the last checkpoint are automatically reinstantiated at restart. So the object will be available, even though no call has been made to GetInterlink in the restarted process. However, the associated Business Interlink data buffers are not recovered, so the Application Engine program must be written such that these buffers are empty whenever a checkpoint is taken.

• Business Interlink objects should not be declared as global unless they are used in several PeopleCode actions, or in a PeopleCode action that is called in a loop. Only in these instances is the overhead of doing a checkpoint worthwhile.