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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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 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:
 *
 *   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.pool;

import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.ReadOnlyIterator;

import java.io.Closeable;
import java.util.Iterator;
import java.util.Map.Entry;
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
        implements ChannelPoolMap, Iterable>, Closeable {
    private final ConcurrentMap map = PlatformDependent.newConcurrentHashMap();

    @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.
                pool.close();
                pool = old;
            }
        }
        return pool;
    }
    /**
     * Remove the {@link ChannelPool} from this {@link AbstractChannelPoolMap}. Returns {@code true} if removed,
     * {@code false} otherwise.
     *
     * Please note that {@code null} keys are not allowed.
     */
    public final boolean remove(K key) {
        P pool =  map.remove(checkNotNull(key, "key"));
        if (pool != null) {
            pool.close();
            return true;
        }
        return false;
    }

    @Override
    public final Iterator> iterator() {
        return new ReadOnlyIterator>(map.entrySet().iterator());
    }

    /**
     * Returns the number of {@link ChannelPool}s currently in this {@link AbstractChannelPoolMap}.
     */
    public final int size() {
        return map.size();
    }

    /**
     * Returns {@code true} if the {@link AbstractChannelPoolMap} is empty, otherwise {@code false}.
     */
    public final boolean isEmpty() {
        return map.isEmpty();
    }

    @Override
    public final boolean contains(K key) {
        return map.containsKey(checkNotNull(key, "key"));
    }

    /**
     * Called once a new {@link ChannelPool} needs to be created as non exists yet for the {@code key}.
     */
    protected abstract P newPool(K key);

    @Override
    public final void close() {
        for (K key: map.keySet()) {
            remove(key);
        }
    }
}