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    1   /***
    2    *
    3    * Copyright 2004 Hiram Chirino
    4    *
    5    *  Licensed under the Apache License, Version 2.0 (the "License");
    6    *  you may not use this file except in compliance with the License.
    7    *  You may obtain a copy of the License at
    8    *
    9    *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   *  Unless required by applicable law or agreed to in writing, software
    12   *  distributed under the License is distributed on an "AS IS" BASIS,
    13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   *  See the License for the specific language governing permissions and
    15   *  limitations under the License.
    16   */
    17
    18  package org.activeio;
    19
    20  import java.io.IOException;
    21
    22
    23  /***
    24   * RequestChannel are used to model the request/reponse exchange that is used
    25   * by higher level protcols such as HTTP and RMI.
    26   *
    27   * @version $Revision$
    28   */
    29  public interface RequestChannel extends Channel {
    30
    31  	/***
    32  	 * Used to send a packet of information going 'down' the channel and wait for
    33  	 * it's reponse 'up' packet.
    34  	 *
    35  	 * This method blocks until the response packet is received or the operation
    36  	 * experiences a timeout.
    37  	 *
    38  	 * @param request
    39  	 * @param timeout
    40  	 * @return the respnse packet or null if the timeout occured.
    41  	 * @throws IOException
    42  	 */
    43  	Packet request(Packet request, long timeout) throws IOException;
    44
    45  	/***
    46  	 * Registers the {@see RequestListener} that the protcol will use to deliver request packets
    47  	 * comming 'up' the channel.
    48  	 *
    49  	 * @param packetListener
    50  	 * @throws IOException
    51  	 */
    52      void setRequestListener(RequestListener requestListener) throws IOException;
    53
    54  	/***
    55  	 * @return the registered RequestListener
    56  	 */
    57      RequestListener getRequestListener();
    58
    59  }