io.netty.channel.embedded.EmbeddedEventLoop 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.embedded;

import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelPromise;
import io.netty.channel.DefaultChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.channel.EventLoopGroup;
import io.netty.util.concurrent.AbstractScheduledEventExecutor;
import io.netty.util.concurrent.Future;

import java.util.ArrayDeque;
import java.util.Queue;
import java.util.concurrent.TimeUnit;

final class EmbeddedEventLoop extends AbstractScheduledEventExecutor implements EventLoop {

    private final Queue tasks = new ArrayDeque(2);

    @Override
    public void execute(Runnable command) {
        if (command == null) {
            throw new NullPointerException("command");
        }
        tasks.add(command);
    }

    void runTasks() {
        for (;;) {
            Runnable task = tasks.poll();
            if (task == null) {
                break;
            }

            task.run();
        }
    }

    long runScheduledTasks() {
        long time = AbstractScheduledEventExecutor.nanoTime();
        for (;;) {
            Runnable task = pollScheduledTask(time);
            if (task == null) {
                return nextScheduledTaskNano();
            }

            task.run();
        }
    }

    long nextScheduledTask() {
        return nextScheduledTaskNano();
    }

    @Override
    protected void cancelScheduledTasks() {
        super.cancelScheduledTasks();
    }

    @Override
    public Future shutdownGracefully(long quietPeriod, long timeout, TimeUnit unit) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Future terminationFuture() {
        throw new UnsupportedOperationException();
    }

    @Override
    @Deprecated
    public void shutdown() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isShuttingDown() {
        return false;
    }

    @Override
    public boolean isShutdown() {
        return false;
    }

    @Override
    public boolean isTerminated() {
        return false;
    }

    @Override
    public boolean awaitTermination(long timeout, TimeUnit unit)
            throws InterruptedException {
        Thread.sleep(unit.toMillis(timeout));
        return false;
    }

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

    @Override
    public ChannelFuture register(Channel channel, ChannelPromise promise) {
        channel.unsafe().register(this, promise);
        return promise;
    }

    @Override
    public boolean inEventLoop() {
        return true;
    }

    @Override
    public boolean inEventLoop(Thread thread) {
        return true;
    }

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

    @Override
    public EventLoopGroup parent() {
        return this;
    }
}