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Java example source code file (ClientConnectionManager.java)

This example source code file (ClientConnectionManager.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

clientconnectionmanager, clientconnectionrequest, object, schemeregistry, threading, threads, timeunit

The ClientConnectionManager.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.conn;

import java.util.concurrent.TimeUnit;

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

/**
 * Management interface for {@link ManagedClientConnection client connections}. 
 * The purpose of an HTTP connection manager is to serve as a factory for new 
 * HTTP connections, manage persistent connections and synchronize access to 
 * persistent connections making sure that only one thread of execution can 
 * have access to a connection at a time.
 * <p>
 * Implementations of this interface must be thread-safe. Access to shared
 * data must be synchronized as methods of this interface may be executed 
 * from multiple threads.
 *
 * @since 4.0
 */
public interface ClientConnectionManager {

    /**
     * Obtains the scheme registry used by this manager.
     *
     * @return  the scheme registry, never <code>null
     */
    SchemeRegistry getSchemeRegistry();
    
    /**
     * Returns a new {@link ClientConnectionRequest}, from which a
     * {@link ManagedClientConnection} can be obtained or the request can be
     * aborted.
     */
    ClientConnectionRequest requestConnection(HttpRoute route, Object state);

    /**
     * Releases a connection for use by others.
     * You may optionally specify how long the connection is valid
     * to be reused.  Values <= 0 are considered to be valid forever.
     * If the connection is not marked as reusable, the connection will
     * not be reused regardless of the valid duration.
     * 
     * If the connection has been released before,
     * the call will be ignored.
     *
     * @param conn      the connection to release
     * @param validDuration the duration of time this connection is valid for reuse
     * @param timeUnit the unit of time validDuration is measured in
     * 
     * @see #closeExpiredConnections()
     */
    void releaseConnection(ManagedClientConnection conn, long validDuration, TimeUnit timeUnit);

    /**
     * Closes idle connections in the pool.
     * Open connections in the pool that have not been used for the
     * timespan given by the argument will be closed.
     * Currently allocated connections are not subject to this method.
     * Times will be checked with milliseconds precision
     * 
     * All expired connections will also be closed.
     * 
     * @param idletime  the idle time of connections to be closed
     * @param tunit     the unit for the <code>idletime
     * 
     * @see #closeExpiredConnections()
     */
    void closeIdleConnections(long idletime, TimeUnit tunit);

    /**
     * Closes all expired connections in the pool.
     * Open connections in the pool that have not been used for
     * the timespan defined when the connection was released will be closed.
     * Currently allocated connections are not subject to this method.
     * Times will be checked with milliseconds precision.
     */
    void closeExpiredConnections();

    /**
     * Shuts down this connection manager and releases allocated resources.
     * This includes closing all connections, whether they are currently
     * used or not.
     */
    void shutdown();

}

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