io.netty.channel.SingleThreadEventLoop Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2012 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.channel;

import io.netty.util.concurrent.EventExecutorGroup;
import io.netty.util.concurrent.SingleThreadEventExecutor;

import java.util.concurrent.ThreadFactory;

/**
 * Abstract base class for {@link EventLoop}'s that execute all its submitted tasks in a single thread.
 *
 */
public abstract class SingleThreadEventLoop extends SingleThreadEventExecutor implements EventLoop {

    /**
     * @see {@link SingleThreadEventExecutor#SingleThreadEventExecutor(EventExecutorGroup, ThreadFactory, boolean)}
     */
    protected SingleThreadEventLoop(EventLoopGroup parent, ThreadFactory threadFactory, boolean addTaskWakesUp) {
        super(parent, threadFactory, addTaskWakesUp);
    }

    @Override
    public EventLoopGroup parent() {
        return (EventLoopGroup) super.parent();
    }

    @Override
    public EventLoop next() {
        return (EventLoop) super.next();
    }

    @Override
    public ChannelFuture register(Channel channel) {
        return register(channel, new DefaultChannelPromise(channel, this));
    }

    @Override
    public ChannelFuture register(final Channel channel, final ChannelPromise promise) {
        if (channel == null) {
            throw new NullPointerException("channel");
        }
        if (promise == null) {
            throw new NullPointerException("promise");
        }

        channel.unsafe().register(this, promise);
        return promise;
    }

    @Override
    protected boolean wakesUpForTask(Runnable task) {
        return !(task instanceof NonWakeupRunnable);
    }

    /**
     * Marker interface for {@linkRunnable} that will not trigger an {@link #wakeup(boolean)} in all cases.
     */
    interface NonWakeupRunnable extends Runnable { }
}