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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain. Use, modify, and |
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* redistribute this code in any way without acknowledgement. |
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*/ |
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|
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package java.util.concurrent; |
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|
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import java.util.List; |
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|
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/** |
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* An executor that provides methods to manage termination. An |
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* <tt>ExecutorService</tt> can be shut down, which will cause it to |
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* stop accepting new tasks. After being shut down, the executor will |
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* eventually terminate, at which point no tasks are actively |
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* executing, no tasks are awaiting execution, and no new tasks can be |
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* submitted. |
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* |
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* <p>The <tt>Executors</tt> class provides factory methods for the |
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* executor services provided in <tt>java.util.concurrent</tt>. |
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* |
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* @since 1.5 |
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* @see Executors |
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* |
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* @spec JSR-166 |
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* @revised $Date: 2003/06/04 11:34:19 $ |
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* @editor $Author: dl $ |
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* @author Doug Lea |
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*/ |
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public interface ExecutorService extends Executor { |
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|
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/** |
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* Initiates an orderly shutdown in which previously submitted tasks |
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* are executed, but no new tasks will be accepted. |
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* |
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*/ |
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void shutdown(); |
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|
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/** |
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* Attempts to stop all actively executing tasks, halts the |
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* processing of waiting tasks, and returns a list of the tasks that were |
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* awaiting execution. |
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* |
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* <p>There are no guarantees beyond best-effort attempts to stop |
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* processing actively executing tasks. For example, typical |
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* implementations will cancel via {@link Thread#interrupt}, so if any |
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* tasks mask or fail to respond to interrupts, they may never terminate. |
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* |
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* @return list of tasks that never commenced execution |
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*/ |
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List shutdownNow(); |
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|
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/** |
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* Returns <tt>true</tt> if this executor has been shut down. |
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* |
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* @return <tt>true</tt> if this executor has been shut down |
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*/ |
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boolean isShutdown(); |
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|
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/** |
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* Returns <tt>true</tt> if all tasks have completed following shut down. |
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* Note that <tt>isTerminated</tt> is never <tt>true</tt> unless |
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* either <tt>shutdown</tt> or <tt>shutdownNow</tt> was called first. |
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* |
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* @return <tt>true</tt> if all tasks have completed following shut down |
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*/ |
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boolean isTerminated(); |
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|
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/** |
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* Blocks until all tasks have completed execution after a shutdown |
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* request, or the timeout occurs, or the current thread is |
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* interrupted, whichever happens first. |
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* |
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* @param timeout the maximum time to wait |
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* @param unit the time unit of the timeout argument |
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* @return <tt>true</tt> if this executor terminated and <tt>false</tt> |
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* if the timeout elapsed before termination |
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* @throws InterruptedException if interrupted while waiting |
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*/ |
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boolean awaitTermination(long timeout, TimeUnit unit) |
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throws InterruptedException; |
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|
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} |
