Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/util/concurrent/Executor.html below:

Executor (Java SE 20 & JDK 20)

All Known Subinterfaces:

ExecutorService, ScheduledExecutorService

All Known Implementing Classes:

AbstractExecutorService, ForkJoinPool, ScheduledThreadPoolExecutor, ThreadPoolExecutor

public interface Executor

An object that executes submitted

tasks. This interface provides a way of decoupling task submission from the mechanics of how each task will be run, including details of thread use, scheduling, etc. An

is normally used instead of explicitly creating threads. For example, rather than invoking

for each of a set of tasks, you might use:

 
 Executor executor = anExecutor();
 executor.execute(new RunnableTask1());
 executor.execute(new RunnableTask2());
 ...

However, the

interface does not strictly require that execution be asynchronous. In the simplest case, an executor can run the submitted task immediately in the caller's thread:

 
 class DirectExecutor implements Executor {
   public void execute(Runnable r) {
     r.run();
   }
 }

More typically, tasks are executed in some thread other than the caller's thread. The executor below spawns a new thread for each task.

 
 class ThreadPerTaskExecutor implements Executor {
   public void execute(Runnable r) {
     new Thread(r).start();
   }
 }

Many

implementations impose some sort of limitation on how and when tasks are scheduled. The executor below serializes the submission of tasks to a second executor, illustrating a composite executor.

 
 class SerialExecutor implements Executor {
   final Queue<Runnable> tasks = new ArrayDeque<>();
   final Executor executor;
   Runnable active;

   SerialExecutor(Executor executor) {
     this.executor = executor;
   }

   public synchronized void execute(Runnable r) {
     tasks.add(() -> {
       try {
         r.run();
       } finally {
         scheduleNext();
       }
     });
     if (active == null) {
       scheduleNext();
     }
   }

   protected synchronized void scheduleNext() {
     if ((active = tasks.poll()) != null) {
       executor.execute(active);
     }
   }
 }

The

implementations provided in this package implement

, which is a more extensive interface. The

class provides an extensible thread pool implementation. The

class provides convenient factory methods for these Executors.

Memory consistency effects: Actions in a thread prior to submitting a Runnable object to an Executor happen-before its execution begins, perhaps in another thread.

Since:

1.5

• Method Summary

  void

  Executes the given command at some time in the future.

• Method Details
  • execute

    Executes the given command at some time in the future. The command may execute in a new thread, in a pooled thread, or in the calling thread, at the discretion of the Executor implementation.

    Parameters:

    command - the runnable task

    Throws:

    RejectedExecutionException - if this task cannot be accepted for execution

    NullPointerException - if command is null

Report a bug or suggest an enhancement
For further API reference and developer documentation see the Java SE Documentation, which contains more detailed, developer-targeted descriptions with conceptual overviews, definitions of terms, workarounds, and working code examples. Other versions.
Java is a trademark or registered trademark of Oracle and/or its affiliates in the US and other countries.
Copyright © 1993, 2023, Oracle and/or its affiliates, 500 Oracle Parkway, Redwood Shores, CA 94065 USA.
All rights reserved. Use is subject to license terms and the documentation redistribution policy.

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4