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Java example source code file (BasicPoolEntryRef.java)

This example source code file (BasicPoolEntryRef.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

basicpoolentryref, httproute, illegalargumentexception, immutable, referencequeue, weakreference

The BasicPoolEntryRef.java example source code

/*
 * ====================================================================
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.impl.conn.tsccm;


import java.lang.ref.WeakReference;
import java.lang.ref.ReferenceQueue;

import org.apache.http.annotation.Immutable;

import org.apache.http.conn.routing.HttpRoute;



/**
 * A weak reference to a {@link BasicPoolEntry BasicPoolEntry}.
 * This reference explicitly keeps the planned route, so the connection
 * can be reclaimed if it is lost to garbage collection.
 *
 * @since 4.0
 */
@Immutable
public class BasicPoolEntryRef extends WeakReference<BasicPoolEntry> {

    /** The planned route of the entry. */
    private final HttpRoute route; // HttpRoute is @Immutable


    /**
     * Creates a new reference to a pool entry.
     *
     * @param entry   the pool entry, must not be <code>null
     * @param queue   the reference queue, or <code>null
     */
    public BasicPoolEntryRef(BasicPoolEntry entry,
                             ReferenceQueue<Object> queue) {
        super(entry, queue);
        if (entry == null) {
            throw new IllegalArgumentException
                ("Pool entry must not be null.");
        }
        route = entry.getPlannedRoute();
    }


    /**
     * Obtain the planned route for the referenced entry.
     * The planned route is still available, even if the entry is gone.
     *
     * @return      the planned route
     */
    public final HttpRoute getRoute() {
        return this.route;
    }

} // class BasicPoolEntryRef

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