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oracle.ide.model.concurrent
Class AsynchronousCallableCompletionService<T>

java.lang.Object
oracle.ide.model.concurrent.AsynchronousCallableCompletionService<T>

Type Parameters:

T - the types of results that the submitted Callables are to have.

public final class AsynchronousCallableCompletionService<T>

extends java.lang.Object

Wraps a CompletionService and provides an abstraction for submitting a set of Callables, along with a single callback class, CallableResultHandler, for processing the result/exception of every Callable.

Usage Example

 class MyAsyncProcessor
 {
    final static int NUMBER_OF_THREADS = 1000;
    CallableResultHandler<Boolean> callableHandlerImpl = new CallableResultHandler<Boolean>() 
    {
       public void onCompletion(Boolean resultFromASingleCallable) {
          // process result
       }

       public void onException(ExecutionException executionException) {
          // process exception
       }
    };
    AsynchronousCallableCompletionService<Boolean> theDecider =
       new AsynchronousCallableCompletionService<Boolean>(
                                Executors.newFixedThreadPool(NUMBER_OF_THREADS), callableHandlerImpl);

    MyAsyncProcessor(List<Callable<Boolean>> districts) {
       for (Callable<Boolean> district: districts) {
          theDecider.submit(district);
       }
    }
 }
 
 

Constructor Summary

AsynchronousCallableCompletionService(java.util.concurrent.ExecutorService executor, CallableResultHandler<T> asyncContentLevelCallback)
Instantiates an AsynchronousCallableCompletionService that will use the provided executor to process Callables.

Method Summary

boolean	isShutdown() Whether the service is in a shutdown state.
boolean	isTerminated() Whether the service is in a terminated state.
void	shutdownNow(boolean mayInterruptIfRunning) Cancels all scheduled Callables including the ones currently in progress and shuts down the completion service.
void	submit(java.util.concurrent.Callable<T> task) Submits a callable that is to be scheduled with the completion service.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AsynchronousCallableCompletionService

public AsynchronousCallableCompletionService(java.util.concurrent.ExecutorService executor,
                                             CallableResultHandler<T> asyncContentLevelCallback)

Instantiates an AsynchronousCallableCompletionService that will use the provided executor to process Callables.

Parameters:

executor - the executor to be used with the completion service

asyncContentLevelCallback - the callback object for processing individual results

Method Detail

submit

public void submit(java.util.concurrent.Callable<T> task)

Submits a callable that is to be scheduled with the completion service. Should the Callable terminate without exceptions, CallableResultHandler#onCompletion(T) will be called. Otherwise, CallableResultHandler.onException(ExecutionException) will be called.

Parameters:

task - the callable task to be submitted for execution.

Throws:

RejectedExecutionException - when service is shut down.

shutdownNow

public void shutdownNow(boolean mayInterruptIfRunning)

Cancels all scheduled Callables including the ones currently in progress and shuts down the completion service. The semantics of the cancellation policy for every Future is the same as the semantics of mayInterruptIfRunning in Future.cancel(boolean). The underlying ExecutorService is shut down. A best-effort-only guarantee is made for currently executing tasks.

Parameters:

mayInterruptIfRunning -

See Also:

Future.cancel(boolean), ExecutorService.shutdownNow()

isShutdown

public boolean isShutdown()

Whether the service is in a shutdown state. If so, no furter tasks can be submitted. Currently submitted callables are not guaranteed to have terminated.

Returns:

true, if the service is shut down.

See Also:

ExecutorService.isShutdown()

isTerminated

public boolean isTerminated()

Whether the service is in a terminated state. A service is in a terminated state, if

• the service is shut down, following a shutdownNow(boolean)
• all queued callables have completed

Returns:

trueif the service is terminated.

See Also:

ExecutorService.isShutdown()

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