com.uber.cadence.workflow

Interface CompletablePromise<V>

All Superinterfaces:

Promise<V>

public interface CompletablePromise<V>
extends Promise<V>

Promise that exposes completion methods.

Method Summary

Modifier and Type	Method and Description
boolean	complete(V value) Completes this Promise with a value if not yet done.
boolean	completeExceptionally(java.lang.RuntimeException value) Completes this Promise with a an exception if not yet done.
boolean	completeFrom(Promise<V> source) Completes or completes exceptionally this promise from the source promise when it becomes completed.

Methods inherited from interface com.uber.cadence.workflow.Promise

allOf, allOf, anyOf, anyOf, exceptionally, get, get, get, get, getFailure, handle, isCompleted, thenApply, thenCompose

Method Detail

complete

boolean complete(V value)

Completes this Promise with a value if not yet done.

Returns:

true if wasn't already completed.

completeExceptionally

boolean completeExceptionally(java.lang.RuntimeException value)

Completes this Promise with a an exception if not yet done.

Returns:

true if wasn't already completed.

completeFrom

boolean completeFrom(Promise<V> source)

Completes or completes exceptionally this promise from the source promise when it becomes completed.

 destination.completeFrom(source);
 

Is shortcut to:

 source.handle((value, failure) -> {
    if (failure != null) {
       destination.completeExceptionally(failure);
    } else {
       destination.complete(value);
    }
    return null;
 }
 

Parameters:

source - promise that is being watched.

Returns:

false if source already completed, otherwise return true or null