ExecutorCompletionServiceV

ExecutorCompletionService<V>

java.util.concurrent

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Java 5.0

This class implements the CompletionService interface, which uses an Executor object passed to its constructor for executing the tasks passed to its submit( ) method. As these tasks complete, their result (or exception) is placed, in the form of a Future object, on an internal queue and becomes available for removal with the blocking take( ) method or the nonblocking or timed poll( ) methods .

This class is useful when you want to execute a number of tasks concurrently and want to process their results in whatever order they complete. See Executors for a source of Executor objects to use with this class.

Figure 16-83. java.util.concurrent.ExecutorCompletionService<V>

 public class  ExecutorCompletionService<V>  implements CompletionService<V> {  // Public Constructors  public  ExecutorCompletionService  (Executor  executor  );        public  ExecutorCompletionService  (Executor  executor  , BlockingQueue<Future<V>>  completionQueue  );  // Methods Implementing CompletionService  public Future<V>  poll  ( );        public Future<V>  poll  (long  timeout  , TimeUnit  unit  ) throws InterruptedException;        public Future<V>  submit  (Callable<V>  task  );        public Future<V>  submit  (Runnable  task  , V  result  );        public Future<V>  take  ( ) throws InterruptedException;   }