AbstractChannelPoolMap.java — netty Source File

Source Code

/*
 * Copyright 2015 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.pool;

import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GlobalEventExecutor;
import io.netty.util.concurrent.Promise;
import io.netty.util.internal.ReadOnlyIterator;

import java.io.Closeable;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import static io.netty.util.internal.ObjectUtil.checkNotNull;

/**
 * A skeletal {@link ChannelPoolMap} implementation. To find the right {@link ChannelPool}
 * the {@link Object#hashCode()} and {@link Object#equals(Object)} is used.
 */
public abstract class AbstractChannelPoolMap<K, P extends ChannelPool>
        implements ChannelPoolMap<K, P>, Iterable<Entry<K, P>>, Closeable {
    private final ConcurrentMap<K, P> map = new ConcurrentHashMap<>();

    @Override
    public final P get(K key) {
        P pool = map.get(checkNotNull(key, "key"));
        if (pool == null) {
            pool = newPool(key);
            P old = map.putIfAbsent(key, pool);
            if (old != null) {
                // We need to destroy the newly created pool as we not use it.
                poolCloseAsyncIfSupported(pool);
                pool = old;
            }
        }
        return pool;
    }
    /**
     * Remove the {@link ChannelPool} from this {@link AbstractChannelPoolMap}. Returns {@code true} if removed,
     * {@code false} otherwise.
     *
     * If the removed pool extends {@link SimpleChannelPool} it will be closed asynchronously to avoid blocking in
     * this method.
     *
     * Please note that {@code null} keys are not allowed.
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