GlobalEventExecutor.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.util.concurrent;

import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.ThreadExecutorMap;
import io.netty.util.internal.ThrowableUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import org.jetbrains.annotations.Async.Schedule;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Queue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

/**
 * Single-thread singleton {@link EventExecutor}.  It starts the thread automatically and stops it when there is no
 * task pending in the task queue for {@code io.netty.globalEventExecutor.quietPeriodSeconds} second
 * (default is 1 second).  Please note it is not scalable to schedule large number of tasks to this executor;
 * use a dedicated executor.
 */
public final class GlobalEventExecutor extends AbstractScheduledEventExecutor implements OrderedEventExecutor {
    private static final InternalLogger logger = InternalLoggerFactory.getInstance(GlobalEventExecutor.class);

    private static final long SCHEDULE_QUIET_PERIOD_INTERVAL;

    static {
        int quietPeriod = SystemPropertyUtil.getInt("io.netty.globalEventExecutor.quietPeriodSeconds", 1);
        if (quietPeriod <= 0) {
            quietPeriod = 1;
        }
        logger.debug("-Dio.netty.globalEventExecutor.quietPeriodSeconds: {}", quietPeriod);

        SCHEDULE_QUIET_PERIOD_INTERVAL = TimeUnit.SECONDS.toNanos(quietPeriod);
    }

    public static final GlobalEventExecutor INSTANCE = new GlobalEventExecutor();

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