com.amazonaws.services.simpleworkflow.flow.core
Class Task

java.lang.Object
  com.amazonaws.services.simpleworkflow.flow.core.Task

public abstract class Task
extends java.lang.Object

Asynchronous task that is executed when all Promises passed to its constructor are ready (null parameter is considered ready).

Should be created in the context of AsyncScope.doAsync() method, from doExecute() or from TryCatchFinally do... methods. Exceptions thrown from doExecute() are delivered asynchronously to the wrapping TryCatchFinally.doCatch(Throwable) method or rethrown from AsyncScope.eventLoop() if no wrapping TryCatchFinally is found.

Example of using Task to implement asynchronous function that sums parameters when both of them are ready:

 
 public Promise<Integer> sum(Promise<Integer> a, Promise<Integer> b) {
     Settable<Integer> result = new Settable<Integer>();
     new Task(a, b) {
         public void doExecute() {
             result.set(a.get() + b.get());
         }
     };
     return result;
 }
 
 

See Also:

AsyncScope, TryCatchFinally, Promise

Constructor Summary

Task(com.amazonaws.services.simpleworkflow.flow.core.AsyncContextAware parent, boolean daemon, Promise<?>... waitFor)

Task(com.amazonaws.services.simpleworkflow.flow.core.AsyncContextAware parent, Promise<?>... waitFor)

Task(boolean daemon, Promise<?>... waitFor)

Task(Promise<?>... waitFor)

Method Summary

java.lang.String	getName()
java.lang.StackTraceElement[]	getStackTrace()
void	setName(java.lang.String name)
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Task

public Task(Promise<?>... waitFor)

Task

public Task(boolean daemon,
            Promise<?>... waitFor)

Task

public Task(com.amazonaws.services.simpleworkflow.flow.core.AsyncContextAware parent,
            boolean daemon,
            Promise<?>... waitFor)

Task

public Task(com.amazonaws.services.simpleworkflow.flow.core.AsyncContextAware parent,
            Promise<?>... waitFor)

Method Detail

getName

public java.lang.String getName()

setName

public void setName(java.lang.String name)

getStackTrace

public java.lang.StackTraceElement[] getStackTrace()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object