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Java example source code file (LocalServerChannel.java)

This example Java source code file (LocalServerChannel.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

abstractserverchannel, arraydeque, channelconfig, channelpipeline, exception, localaddress, localchannel, net, network, object, override, queue, runnable, singlethreadeventexecutor, singlethreadeventloop, socketaddress, util

The LocalServerChannel.java Java example 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:
 *
 *   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.local;

import io.netty.channel.AbstractServerChannel;
import io.netty.channel.ChannelConfig;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.DefaultChannelConfig;
import io.netty.channel.EventLoop;
import io.netty.channel.ServerChannel;
import io.netty.channel.SingleThreadEventLoop;
import io.netty.util.concurrent.SingleThreadEventExecutor;

import java.net.SocketAddress;
import java.util.ArrayDeque;
import java.util.Queue;

/**
 * A {@link ServerChannel} for the local transport which allows in VM communication.
 */
public class LocalServerChannel extends AbstractServerChannel {

    private final ChannelConfig config = new DefaultChannelConfig(this);
    private final Queue<Object> inboundBuffer = new ArrayDeque();
    private final Runnable shutdownHook = new Runnable() {
        @Override
        public void run() {
            unsafe().close(unsafe().voidPromise());
        }
    };

    private volatile int state; // 0 - open, 1 - active, 2 - closed
    private volatile LocalAddress localAddress;
    private volatile boolean acceptInProgress;

    @Override
    public ChannelConfig config() {
        return config;
    }

    @Override
    public LocalAddress localAddress() {
        return (LocalAddress) super.localAddress();
    }

    @Override
    public LocalAddress remoteAddress() {
        return (LocalAddress) super.remoteAddress();
    }

    @Override
    public boolean isOpen() {
        return state < 2;
    }

    @Override
    public boolean isActive() {
        return state == 1;
    }

    @Override
    protected boolean isCompatible(EventLoop loop) {
        return loop instanceof SingleThreadEventLoop;
    }

    @Override
    protected SocketAddress localAddress0() {
        return localAddress;
    }

    @Override
    protected void doRegister() throws Exception {
        ((SingleThreadEventExecutor) eventLoop()).addShutdownHook(shutdownHook);
    }

    @Override
    protected void doBind(SocketAddress localAddress) throws Exception {
        this.localAddress = LocalChannelRegistry.register(this, this.localAddress, localAddress);
        state = 1;
    }

    @Override
    protected void doClose() throws Exception {
        if (state <= 1) {
            // Update all internal state before the closeFuture is notified.
            if (localAddress != null) {
                LocalChannelRegistry.unregister(localAddress);
                localAddress = null;
            }
            state = 2;
        }
    }

    @Override
    protected void doDeregister() throws Exception {
        ((SingleThreadEventExecutor) eventLoop()).removeShutdownHook(shutdownHook);
    }

    @Override
    protected void doBeginRead() throws Exception {
        if (acceptInProgress) {
            return;
        }

        Queue<Object> inboundBuffer = this.inboundBuffer;
        if (inboundBuffer.isEmpty()) {
            acceptInProgress = true;
            return;
        }

        ChannelPipeline pipeline = pipeline();
        for (;;) {
            Object m = inboundBuffer.poll();
            if (m == null) {
                break;
            }
            pipeline.fireChannelRead(m);
        }
        pipeline.fireChannelReadComplete();
    }

    LocalChannel serve(final LocalChannel peer) {
        final LocalChannel child = new LocalChannel(this, peer);
        if (eventLoop().inEventLoop()) {
            serve0(child);
        } else {
            eventLoop().execute(new Runnable() {
              @Override
              public void run() {
                serve0(child);
              }
            });
        }
        return child;
    }

    private void serve0(final LocalChannel child) {
        inboundBuffer.add(child);
        if (acceptInProgress) {
            acceptInProgress = false;
            ChannelPipeline pipeline = pipeline();
            for (;;) {
                Object m = inboundBuffer.poll();
                if (m == null) {
                    break;
                }
                pipeline.fireChannelRead(m);
            }
            pipeline.fireChannelReadComplete();
        }
    }
}




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