home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (DefaultClientConnectionOperator.java)

This example source code file (DefaultClientConnectionOperator.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

connectexception, connection, defaultclientconnectionoperator, httpcontext, httphost, httpparams, illegalargumentexception, inetaddress, io, ioexception, layeredsocketfactory, net, network, parameters, scheme, target, threadsafe

The DefaultClientConnectionOperator.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;

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

import org.apache.http.annotation.ThreadSafe;

import org.apache.http.HttpHost;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.protocol.HttpContext;

import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.HttpHostConnectException;
import org.apache.http.conn.OperatedClientConnection;
import org.apache.http.conn.ClientConnectionOperator;
import org.apache.http.conn.scheme.LayeredSocketFactory;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.scheme.SocketFactory;

/**
 * Default implementation of a {@link ClientConnectionOperator}. It uses 
 * a {@link SchemeRegistry} to look up {@link SocketFactory} objects.
 * <p>
 * The following parameters can be used to customize the behavior of this 
 * class: 
 * <ul>
 *  <li>{@link org.apache.http.params.CoreProtocolPNames#HTTP_ELEMENT_CHARSET}
 *  <li>{@link org.apache.http.params.CoreConnectionPNames#TCP_NODELAY}
 *  <li>{@link org.apache.http.params.CoreConnectionPNames#SO_TIMEOUT}
 *  <li>{@link org.apache.http.params.CoreConnectionPNames#SO_LINGER}
 *  <li>{@link org.apache.http.params.CoreConnectionPNames#SOCKET_BUFFER_SIZE}
 *  <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_LINE_LENGTH}
 * </ul>
 *
 * @since 4.0
 */
@ThreadSafe
public class DefaultClientConnectionOperator implements ClientConnectionOperator {

    /** The scheme registry for looking up socket factories. */
    protected final SchemeRegistry schemeRegistry; // @ThreadSafe

    /**
     * Creates a new client connection operator for the given scheme registry.
     *
     * @param schemes   the scheme registry
     */
    public DefaultClientConnectionOperator(SchemeRegistry schemes) {
        if (schemes == null) {
            throw new IllegalArgumentException
                ("Scheme registry must not be null.");
        }
        schemeRegistry = schemes;
    }

    public OperatedClientConnection createConnection() {
        return new DefaultClientConnection();
    }

    public void openConnection(OperatedClientConnection conn,
                               HttpHost target,
                               InetAddress local,
                               HttpContext context,
                               HttpParams params)
        throws IOException {

        if (conn == null) {
            throw new IllegalArgumentException
                ("Connection must not be null.");
        }
        if (target == null) {
            throw new IllegalArgumentException
                ("Target host must not be null.");
        }
        if (params == null) {
            throw new IllegalArgumentException
                ("Parameters must not be null.");
        }
        if (conn.isOpen()) {
            throw new IllegalArgumentException
                ("Connection must not be open.");
        }

        SocketFactory sf = null;
        LayeredSocketFactory layeredsf = null;
        
        Scheme schm = schemeRegistry.getScheme(target.getSchemeName());
        sf = schm.getSocketFactory();
        if (sf instanceof LayeredSocketFactory) {
            layeredsf = (LayeredSocketFactory) sf;
            sf = PlainSocketFactory.getSocketFactory();
        }

        InetAddress[] addresses = InetAddress.getAllByName(target.getHostName());
        for (int i = 0; i < addresses.length; i++) {
            InetAddress address = addresses[i];
            boolean last = i == addresses.length - 1;
            Socket sock = sf.createSocket();
            conn.opening(sock, target);
            try {
                Socket connsock = sf.connectSocket(
                        sock, 
                        address.getHostAddress(),
                        schm.resolvePort(target.getPort()),
                        local, 0, params);
                if (sock != connsock) {
                    sock = connsock;
                    conn.opening(sock, target);
                }
                if (layeredsf != null) {
                    connsock = layeredsf.createSocket(
                            sock, 
                            target.getHostName(),
                            schm.resolvePort(target.getPort()),
                            true);
                    if (sock != connsock) {
                        sock = connsock;
                        conn.opening(sock, target);
                    }
                    sf = layeredsf;
                }
                prepareSocket(sock, context, params);
                conn.openCompleted(sf.isSecure(sock), params);
                break;
            } catch (ConnectException ex) {
                if (last) {
                    throw new HttpHostConnectException(target, ex);
                }
            } catch (ConnectTimeoutException ex) {
                if (last) {
                    throw ex;
                }
            }
        }
    }

    public void updateSecureConnection(OperatedClientConnection conn,
                                       HttpHost target,
                                       HttpContext context,
                                       HttpParams params)
        throws IOException {


        if (conn == null) {
            throw new IllegalArgumentException
                ("Connection must not be null.");
        }
        if (target == null) {
            throw new IllegalArgumentException
                ("Target host must not be null.");
        }
        if (params == null) {
            throw new IllegalArgumentException
                ("Parameters must not be null.");
        }
        if (!conn.isOpen()) {
            throw new IllegalArgumentException
                ("Connection must be open.");
        }

        final Scheme schm = schemeRegistry.getScheme(target.getSchemeName());
        if (!(schm.getSocketFactory() instanceof LayeredSocketFactory)) {
            throw new IllegalArgumentException
                ("Target scheme (" + schm.getName() +
                 ") must have layered socket factory.");
        }

        final LayeredSocketFactory lsf = (LayeredSocketFactory) schm.getSocketFactory();
        final Socket sock; 
        try {
            sock = lsf.createSocket
                (conn.getSocket(), target.getHostName(), target.getPort(), true);
        } catch (ConnectException ex) {
            throw new HttpHostConnectException(target, ex);
        }
        prepareSocket(sock, context, params);
        conn.update(sock, target, lsf.isSecure(sock), params);
    }

    /**
     * Performs standard initializations on a newly created socket.
     *
     * @param sock      the socket to prepare
     * @param context   the context for the connection
     * @param params    the parameters from which to prepare the socket
     *
     * @throws IOException      in case of an IO problem
     */
    protected void prepareSocket(Socket sock, HttpContext context,
                                 HttpParams params)
        throws IOException {

        sock.setTcpNoDelay(HttpConnectionParams.getTcpNoDelay(params));
        sock.setSoTimeout(HttpConnectionParams.getSoTimeout(params));

        int linger = HttpConnectionParams.getLinger(params);
        if (linger >= 0) {
            sock.setSoLinger(linger > 0, linger);
        }
    }

}

Other Java examples (source code examples)

Here is a short list of links related to this Java DefaultClientConnectionOperator.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.