How to set Parent Close Policy in Java

Set Parent Close Policy on an instance of ChildWorkflowOptions using ChildWorkflowOptions.newBuilder().setParentClosePolicy.

• Type: ChildWorkflowOptions.Builder
• Default: None.

   public void parentWorkflow() {
       ChildWorkflowOptions options =
          ChildWorkflowOptions.newBuilder()
              .setParentClosePolicy(ParentClosePolicy.PARENT_CLOSE_POLICY_ABANDON)
              .build();
       MyChildWorkflow child = Workflow.newChildWorkflowStub(MyChildWorkflow.class, options);
       Async.procedure(child::<workflowMethod>, <args>...);
       Promise<WorkflowExecution> childExecution = Workflow.getWorkflowExecution(child);
       // Wait for child to start
       childExecution.get()
  }

In this example, we are:

1. Setting ChildWorkflowOptions.ParentClosePolicy to ABANDON when creating a Child Workflow stub.
2. Starting Child Workflow Execution asynchronously using Async.function or Async.procedure.
3. Calling Workflow.getWorkflowExecution(…) on the child stub.
4. Waiting for the Promise returned by getWorkflowExecution to complete. This indicates whether the Child Workflow started successfully (or failed).
5. Completing parent Workflow Execution asynchronously.

Steps 3 and 4 are needed to ensure that a Child Workflow Execution starts before the parent closes. If the parent initiates a Child Workflow Execution and then completes immediately after, the Child Workflow will never execute.