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/*
 * $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/HttpConnectionManager.java,v 1.15 2003/01/28 04:40:20 jsdever Exp $
 * $Revision: 1.15 $
 * $Date: 2003/01/28 04:40:20 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * 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
 * .
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

package org.apache.commons.httpclient;

/**
 * An interface for classes that manage HttpConnections.
 * 
 * @see org.apache.commons.httpclient.HttpConnection
 * @see org.apache.commons.httpclient.HttpClient#HttpClient(HttpConnectionManager)
 *
 * @author Unascribed
 * @author Mike Bowler
 * 
 * @since 2.0
 */
public interface HttpConnectionManager {

    /**
     * Gets an HttpConnection for a given host configuration. If a connection is
     * not available this method will block until one is.
     *
     * The connection manager should be registered with any HttpConnection that
     * is created.
     *
     * @param hostConfiguration the host configuration to use to configure the
     * connection
     * 
     * @return an HttpConnection for the given configuration
     * 
     * @see HttpConnection#setHttpConnectionManager(HttpConnectionManager)
     */
    HttpConnection getConnection(HostConfiguration hostConfiguration);

    /**
     * Gets an HttpConnection for a given host configuration. If a connection is
     * not available, this method will block for at most the specified number of
     * milliseconds or until a connection becomes available.
     *
     * The connection manager should be registered with any HttpConnection that
     * is created.
     *
     * @param hostConfiguration the host configuration to use to configure the
     * connection
     * @param timeout - the time (in milliseconds) to wait for a connection to
     * become available, 0 to specify an infinite timeout
     * 
     * @return an HttpConnection for the given configuraiton
     * 
     * @throws HttpException if no connection becomes available before the
     * timeout expires
     * 
     * @see HttpConnection#setHttpConnectionManager(HttpConnectionManager)
     */
    HttpConnection getConnection(HostConfiguration hostConfiguration, long timeout)
        throws HttpException;

    /**
     * Releases the given HttpConnection for use by other requests.
     *
     * @param conn - The HttpConnection to make available.
     */
    void releaseConnection(HttpConnection conn);
}
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