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Java example source code file (OperatedClientConnection.java)

This example source code file (OperatedClientConnection.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

httpclientconnection, httphost, httpinetconnection, httpparams, io, ioexception, net, network, operatedclientconnection, socket

The OperatedClientConnection.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.io.IOException;
import java.net.Socket;

import org.apache.http.HttpClientConnection;
import org.apache.http.HttpHost;
import org.apache.http.HttpInetConnection;
import org.apache.http.params.HttpParams;

/**
 * A client-side connection that relies on outside logic to connect sockets to the 
 * appropriate hosts. It can be operated directly by an application, or through an
 * {@link ClientConnectionOperator operator}.
 *
 * @since 4.0
 */
public interface OperatedClientConnection extends HttpClientConnection, HttpInetConnection {

    /**
     * Obtains the target host for this connection.
     * If the connection is to a proxy but not tunnelled, this is
     * the proxy. If the connection is tunnelled through a proxy,
     * this is the target of the tunnel.
     * <br/>
     * The return value is well-defined only while the connection is open.
     * It may change even while the connection is open,
     * because of an {@link #update update}.
     *
     * @return  the host to which this connection is opened
     */
    HttpHost getTargetHost();

    /**
     * Indicates whether this connection is secure.
     * The return value is well-defined only while the connection is open.
     * It may change even while the connection is open,
     * because of an {@link #update update}.
     *
     * @return  <code>true if this connection is secure,
     *          <code>false otherwise
     */
    boolean isSecure();

    /**
     * Obtains the socket for this connection.
     * The return value is well-defined only while the connection is open.
     * It may change even while the connection is open,
     * because of an {@link #update update}.
     *
     * @return  the socket for communicating with the
     *          {@link #getTargetHost target host}
     */
    Socket getSocket();

    /**
     * Signals that this connection is in the process of being open.
     * <br/>
     * By calling this method, you can provide the connection with
     * the unconnected socket that will be connected before
     * {@link #openCompleted} is called. This allows 
     * the connection to close that socket if
     * {@link org.apache.http.HttpConnection#shutdown shutdown}
     * is called before it is open. Closing the unconnected socket
     * will interrupt a thread that is blocked on the connect.
     * Otherwise, that thread will either time out on the connect,
     * or it returns successfully and then opens this connection
     * which was just shut down.
     * <br/>
     * You also must call {@link #openCompleted} in order to complete
     * the process
     *
     * @param sock      the unconnected socket which is about to
     *                  be connected.
     * @param target    the target host of this connection
     */
    void opening(Socket sock, HttpHost target)
        throws IOException;

    /**
     * Signals that the connection has been successfully open.
     * An attempt to call this method on an open connection will cause
     * an exception.
     *
     * @param secure    <code>true if this connection is secure, for
     *                  example if an <code>SSLSocket is used, or
     *                  <code>false if it is not secure
     * @param params    parameters for this connection. The parameters will
     *                  be used when creating dependent objects, for example
     *                  to determine buffer sizes.
     */
    void openCompleted(boolean secure, HttpParams params)
        throws IOException;

    /**
     * Updates this connection.
     * A connection can be updated only while it is open.
     * Updates are used for example when a tunnel has been established,
     * or when a TLS/SSL connection has been layered on top of a plain
     * socket connection.
     * <br/>
     * <b>Note: Updating the connection will not close the
     * previously used socket. It is the caller's responsibility to close
     * that socket if it is no longer required.
     *
     * @param sock      the new socket for communicating with the target host,
     *                  or <code>null to continue using the old socket.
     *                  If <code>null is passed, helper objects that
     *                  depend on the socket should be re-used. In that case,
     *                  some changes in the parameters will not take effect.
     * @param target    the new target host of this connection
     * @param secure    <code>true if this connection is now secure,
     *                  <code>false if it is not secure
     * @param params    new parameters for this connection
     */
    void update(Socket sock, HttpHost target,
                boolean secure, HttpParams params)
        throws IOException;

}

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