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Java example source code file (SocketFactory.java)

This example source code file (SocketFactory.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

connecttimeoutexception, httpparams, illegalargumentexception, inetaddress, io, ioexception, net, network, socket, socketfactory, string, unknownhostexception

The SocketFactory.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.scheme;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.params.HttpParams;

/**
 * A factory for creating, initializing and connecting sockets.
 * The factory encapsulates the logic for establishing a socket connection.
 *
 * @since 4.0
 */
public interface SocketFactory {

    /**
     * Creates a new, unconnected socket.
     * The socket should subsequently be passed to
     * {@link #connectSocket connectSocket}.
     *
     * @return  a new socket
     * 
     * @throws IOException if an I/O error occurs while creating the socket
     */
    Socket createSocket()
        throws IOException;

    /**
     * Connects a socket to the given host.
     * 
     * @param sock      the socket to connect, as obtained from
     *                  {@link #createSocket createSocket}.
     *                  <code>null indicates that a new socket
     *                  should be created and connected.
     * @param host      the host to connect to
     * @param port      the port to connect to on the host
     * @param localAddress the local address to bind the socket to, or
     *                  <code>null for any
     * @param localPort the port on the local machine,
     *                  0 or a negative number for any
     * @param params    additional {@link HttpParams parameters} for connecting
     * 
     * @return  the connected socket. The returned object may be different
     *          from the <code>sock argument if this factory supports
     *          a layered protocol.
     * 
     * @throws IOException if an I/O error occurs
     * @throws UnknownHostException if the IP address of the target host
     *          can not be determined
     * @throws ConnectTimeoutException if the socket cannot be connected
     *          within the time limit defined in the <code>params
     */
    Socket connectSocket(
        Socket sock,
        String host, 
        int port, 
        InetAddress localAddress, 
        int localPort,
        HttpParams params
    ) throws IOException, UnknownHostException, ConnectTimeoutException;

    /**
     * Checks whether a socket provides a secure connection.
     * The socket must be {@link #connectSocket connected}
     * by this factory.
     * The factory will <i>not perform I/O operations
     * in this method.
     * <br/>
     * As a rule of thumb, plain sockets are not secure and
     * TLS/SSL sockets are secure. However, there may be
     * application specific deviations. For example, a plain
     * socket to a host in the same intranet ("trusted zone")
     * could be considered secure. On the other hand, a
     * TLS/SSL socket could be considered insecure based on
     * the cipher suite chosen for the connection.
     *
     * @param sock      the connected socket to check
     *
     * @return  <code>true if the connection of the socket
     *          should be considered secure, or
     *          <code>false if it should not
     *
     * @throws IllegalArgumentException
     *  if the argument is invalid, for example because it is
     *  not a connected socket or was created by a different
     *  socket factory.
     *  Note that socket factories are <i>not required to
     *  check these conditions, they may simply return a default
     *  value when called with an invalid socket argument.
     */
    boolean isSecure(Socket sock)
        throws IllegalArgumentException;

}

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