SingleThreadEventLoop.java — netty Source File

Source Code

/*
 * 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:
 *
 *   https://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.RejectedExecutionHandler;
import io.netty.util.concurrent.RejectedExecutionHandlers;
import io.netty.util.concurrent.SingleThreadEventExecutor;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.UnstableApi;

import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.concurrent.Executor;
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 {

    protected static final int DEFAULT_MAX_PENDING_TASKS = Math.max(16,
            SystemPropertyUtil.getInt("io.netty.eventLoop.maxPendingTasks", Integer.MAX_VALUE));

    private final Queue<Runnable> tailTasks;

    protected SingleThreadEventLoop(EventLoopGroup parent, ThreadFactory threadFactory, boolean addTaskWakesUp) {
        this(parent, threadFactory, addTaskWakesUp, DEFAULT_MAX_PENDING_TASKS, RejectedExecutionHandlers.reject());
    }

    protected SingleThreadEventLoop(EventLoopGroup parent, ThreadFactory threadFactory,
                                    boolean addTaskWakesUp, boolean supportSuspension) {
        this(parent, threadFactory, addTaskWakesUp, supportSuspension, DEFAULT_MAX_PENDING_TASKS,
                RejectedExecutionHandlers.reject());
    }

    protected SingleThreadEventLoop(EventLoopGroup parent, Executor executor, boolean addTaskWakesUp) {
        this(parent, executor, addTaskWakesUp, false);
    }

    protected SingleThreadEventLoop(EventLoopGroup parent, Executor executor,
                                    boolean addTaskWakesUp, boolean supportSuspension) {
        this(parent, executor, addTaskWakesUp, supportSuspension, DEFAULT_MAX_PENDING_TASKS,
                RejectedExecutionHandlers.reject());
    }

// ... (186 more lines)