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Java example source code file (DefaultChannelGroupFuture.java)

This example Java source code file (DefaultChannelGroupFuture.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

channelfuture, channelfuturelistener, channelgroupexception, defaultchannelgroupfuture, defaultentry, eventexecutor, illegalstateexception, interruptedexception, map, nullpointerexception, override, util, void

The DefaultChannelGroupFuture.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.group;

import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.util.concurrent.BlockingOperationException;
import io.netty.util.concurrent.DefaultPromise;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import io.netty.util.concurrent.ImmediateEventExecutor;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;


/**
 * The default {@link ChannelGroupFuture} implementation.
 */
final class DefaultChannelGroupFuture extends DefaultPromise<Void> implements ChannelGroupFuture {

    private final ChannelGroup group;
    private final Map<Channel, ChannelFuture> futures;
    private int successCount;
    private int failureCount;

    private final ChannelFutureListener childListener = new ChannelFutureListener() {
        @Override
        public void operationComplete(ChannelFuture future) throws Exception {
            boolean success = future.isSuccess();
            boolean callSetDone;
            synchronized (DefaultChannelGroupFuture.this) {
                if (success) {
                    successCount ++;
                } else {
                    failureCount ++;
                }

                callSetDone = successCount + failureCount == futures.size();
                assert successCount + failureCount <= futures.size();
            }

            if (callSetDone) {
                if (failureCount > 0) {
                    List<Map.Entry failed =
                            new ArrayList<Map.Entry(failureCount);
                    for (ChannelFuture f: futures.values()) {
                        if (!f.isSuccess()) {
                            failed.add(new DefaultEntry<Channel, Throwable>(f.channel(), f.cause()));
                        }
                    }
                    setFailure0(new ChannelGroupException(failed));
                } else {
                    setSuccess0();
                }
            }
        }
    };

    /**
     * Creates a new instance.
     */
    DefaultChannelGroupFuture(ChannelGroup group, Collection<ChannelFuture> futures,  EventExecutor executor) {
        super(executor);
        if (group == null) {
            throw new NullPointerException("group");
        }
        if (futures == null) {
            throw new NullPointerException("futures");
        }

        this.group = group;

        Map<Channel, ChannelFuture> futureMap = new LinkedHashMap();
        for (ChannelFuture f: futures) {
            futureMap.put(f.channel(), f);
        }

        this.futures = Collections.unmodifiableMap(futureMap);

        for (ChannelFuture f: this.futures.values()) {
            f.addListener(childListener);
        }

        // Done on arrival?
        if (this.futures.isEmpty()) {
            setSuccess0();
        }
    }

    DefaultChannelGroupFuture(ChannelGroup group, Map<Channel, ChannelFuture> futures, EventExecutor executor) {
        super(executor);
        this.group = group;
        this.futures = Collections.unmodifiableMap(futures);
        for (ChannelFuture f: this.futures.values()) {
            f.addListener(childListener);
        }

        // Done on arrival?
        if (this.futures.isEmpty()) {
            setSuccess0();
        }
    }

    @Override
    public ChannelGroup group() {
        return group;
    }

    @Override
    public ChannelFuture find(Channel channel) {
        return futures.get(channel);
    }

    @Override
    public Iterator<ChannelFuture> iterator() {
        return futures.values().iterator();
    }

    @Override
    public synchronized boolean isPartialSuccess() {
        return successCount != 0 && successCount != futures.size();
    }

    @Override
    public synchronized boolean isPartialFailure() {
        return failureCount != 0 && failureCount != futures.size();
    }

    @Override
    public DefaultChannelGroupFuture addListener(GenericFutureListener<? extends Future listener) {
        super.addListener(listener);
        return this;
    }

    @Override
    public DefaultChannelGroupFuture addListeners(GenericFutureListener<? extends Future... listeners) {
        super.addListeners(listeners);
        return this;
    }

    @Override
    public DefaultChannelGroupFuture removeListener(GenericFutureListener<? extends Future listener) {
        super.removeListener(listener);
        return this;
    }

    @Override
    public DefaultChannelGroupFuture removeListeners(
            GenericFutureListener<? extends Future... listeners) {
        super.removeListeners(listeners);
        return this;
    }

    @Override
    public DefaultChannelGroupFuture await() throws InterruptedException {
        super.await();
        return this;
    }

    @Override
    public DefaultChannelGroupFuture awaitUninterruptibly() {
        super.awaitUninterruptibly();
        return this;
    }

    @Override
    public DefaultChannelGroupFuture syncUninterruptibly() {
        super.syncUninterruptibly();
        return this;
    }

    @Override
    public DefaultChannelGroupFuture sync() throws InterruptedException {
        super.sync();
        return this;
    }

    @Override
    public ChannelGroupException cause() {
        return (ChannelGroupException) super.cause();
    }

    private void setSuccess0() {
        super.setSuccess(null);
    }

    private void setFailure0(ChannelGroupException cause) {
        super.setFailure(cause);
    }

    @Override
    public DefaultChannelGroupFuture setSuccess(Void result) {
        throw new IllegalStateException();
    }

    @Override
    public boolean trySuccess(Void result) {
        throw new IllegalStateException();
    }

    @Override
    public DefaultChannelGroupFuture setFailure(Throwable cause) {
        throw new IllegalStateException();
    }

    @Override
    public boolean tryFailure(Throwable cause) {
        throw new IllegalStateException();
    }

    @Override
    protected void checkDeadLock() {
        EventExecutor e = executor();
        if (e != null && e != ImmediateEventExecutor.INSTANCE && e.inEventLoop()) {
            throw new BlockingOperationException();
        }
    }

    private static final class DefaultEntry<K, V> implements Map.Entry {
        private final K key;
        private final V value;

        DefaultEntry(K key, V value) {
            this.key = key;
            this.value = value;
        }

        @Override
        public K getKey() {
            return key;
        }

        @Override
        public V getValue() {
            return value;
        }

        @Override
        public V setValue(V value) {
            throw new UnsupportedOperationException("read-only");
        }
    }
}

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