Java example source code file (AbstractEventExecutor.java)

This example Java source code file (AbstractEventExecutor.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstracteventexecutor, default_shutdown_timeout, deprecated, eventexecutorgroup, future, override, promisetask, runnablefuture, scheduledfuture, succeededfuture, threading, threads, timeunit, unsupportedoperationexception, util

The AbstractEventExecutor.java Java example source code

/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.util.concurrent;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.Callable;
import java.util.concurrent.RunnableFuture;
import java.util.concurrent.TimeUnit;

/**
 * Abstract base class for {@link EventExecutor} implementations.
 */
public abstract class AbstractEventExecutor extends AbstractExecutorService implements EventExecutor {

    static final long DEFAULT_SHUTDOWN_QUIET_PERIOD = 2;
    static final long DEFAULT_SHUTDOWN_TIMEOUT = 15;

    private final EventExecutorGroup parent;
    private final Collection<EventExecutor> selfCollection = Collections.singleton(this);

    protected AbstractEventExecutor() {
        this(null);
    }

    protected AbstractEventExecutor(EventExecutorGroup parent) {
        this.parent = parent;
    }

    @Override
    public EventExecutorGroup parent() {
        return parent;
    }

    @Override
    public EventExecutor next() {
        return this;
    }

    @Override
    public boolean inEventLoop() {
        return inEventLoop(Thread.currentThread());
    }

    @Override
    public Iterator<EventExecutor> iterator() {
        return selfCollection.iterator();
    }

    @Override
    public Future<?> shutdownGracefully() {
        return shutdownGracefully(DEFAULT_SHUTDOWN_QUIET_PERIOD, DEFAULT_SHUTDOWN_TIMEOUT, TimeUnit.SECONDS);
    }

    /**
     * @deprecated {@link #shutdownGracefully(long, long, TimeUnit)} or {@link #shutdownGracefully()} instead.
     */
    @Override
    @Deprecated
    public abstract void shutdown();

    /**
     * @deprecated {@link #shutdownGracefully(long, long, TimeUnit)} or {@link #shutdownGracefully()} instead.
     */
    @Override
    @Deprecated
    public List<Runnable> shutdownNow() {
        shutdown();
        return Collections.emptyList();
    }

    @Override
    public <V> Promise newPromise() {
        return new DefaultPromise<V>(this);
    }

    @Override
    public <V> ProgressivePromise newProgressivePromise() {
        return new DefaultProgressivePromise<V>(this);
    }

    @Override
    public <V> Future newSucceededFuture(V result) {
        return new SucceededFuture<V>(this, result);
    }

    @Override
    public <V> Future newFailedFuture(Throwable cause) {
        return new FailedFuture<V>(this, cause);
    }

    @Override
    public Future<?> submit(Runnable task) {
        return (Future<?>) super.submit(task);
    }

    @Override
    public <T> Future submit(Runnable task, T result) {
        return (Future<T>) super.submit(task, result);
    }

    @Override
    public <T> Future submit(Callable task) {
        return (Future<T>) super.submit(task);
    }

    @Override
    protected final <T> RunnableFuture newTaskFor(Runnable runnable, T value) {
        return new PromiseTask<T>(this, runnable, value);
    }

    @Override
    protected final <T> RunnableFuture newTaskFor(Callable callable) {
        return new PromiseTask<T>(this, callable);
    }

    @Override
    public ScheduledFuture<?> schedule(Runnable command, long delay,
                                       TimeUnit unit) {
        throw new UnsupportedOperationException();
    }

    @Override
    public <V> ScheduledFuture schedule(Callable callable, long delay, TimeUnit unit) {
        throw new UnsupportedOperationException();
    }

    @Override
    public ScheduledFuture<?> scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) {
        throw new UnsupportedOperationException();
    }

    @Override
    public ScheduledFuture<?> scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
        throw new UnsupportedOperationException();
    }
}