org.flowable.cmmn.api.delegate

Interface PlanItemFutureJavaDelegate<Output>

Type Parameters:

Output - the output of the execution

All Known Subinterfaces:

FlowablePlanItemFutureJavaDelegate<Input,Output>, MapBasedFlowablePlanItemFutureJavaDelegate

public interface PlanItemFutureJavaDelegate<Output>

Convenience class to be used when needing to execute custom logic for a plan item by delegating to a Java class. When this interface is implemented then the execution of the logic can happen on a different thread then the case execution. The plan item is completed, after the future is done.

This interface allows fine grained control on how the future should be created. It gives access to the AsyncTaskInvoker which can delegate execution to a shared task executor. However, it doesn't have to be used. In case you don't need custom task executor the FlowablePlanItemFutureJavaDelegate can be used.

Author:

Filip Hrisafov

See Also:

FlowablePlanItemFutureJavaDelegate, MapBasedFlowablePlanItemFutureJavaDelegate

Method Summary

Modifier and Type	Method and Description
void	afterExecution(DelegatePlanItemInstance planItemInstance, Output executionData) Method invoked with the result from execute(DelegatePlanItemInstance, AsyncTaskInvoker).
CompletableFuture<Output>	execute(DelegatePlanItemInstance planItemInstance, AsyncTaskInvoker taskInvoker) Perform the execution of the delegate, potentially on another thread.

Method Detail

execute

CompletableFuture<Output> execute(DelegatePlanItemInstance planItemInstance,
                                  AsyncTaskInvoker taskInvoker)

Perform the execution of the delegate, potentially on another thread. The result of the future is passed in the afterExecution(DelegatePlanItemInstance, Object) in order to store the data on the planItemInstance on the same thread as the caller of this method. IMPORTANT: the planItemInstance should only be used to read data before creating the future. The planItemInstance should not be used in the task that will be executed on a new thread.

The AsyncTaskInvoker is in order to schedule an execution on a different thread. However, it is also possible to use a different scheduler, or return a future not created by the given taskInvoker.

Parameters:

planItemInstance - the planItemInstance that can be used to extract data

taskInvoker - the task invoker that can be used to execute expensive operation on another thread

Returns:

the output data of the execution

afterExecution

void afterExecution(DelegatePlanItemInstance planItemInstance,
                    Output executionData)

Method invoked with the result from execute(DelegatePlanItemInstance, AsyncTaskInvoker). This should be used to set data on the DelegatePlanItemInstance. This is on the same thread as execute(DelegatePlanItemInstance, AsyncTaskInvoker) and participates in the case transaction.

Parameters:

planItemInstance - the planItemInstance to which data can be set

executionData - the execution data