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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   * The Service interface is used control the running state of a channel.
    24   *
    25   * Some channels may use background threads to provide SEDA style processing.  By
    26   * implenting the Service interface, a protcol can allow a container to
    27   * control those threads.
    28   *
    29   * @version $Revision$
    30   */
    31  public interface Service {
    32
    33  	static final public long NO_WAIT_TIMEOUT=0;
    34  	static final public long WAIT_FOREVER_TIMEOUT=-1;
    35
    36  	/***
    37  	 * Starts the channel.  Once started, the channel is in the running state.
    38  	 *
    39  	 * @throws IOException
    40  	 */
    41      void start() throws IOException;
    42
    43      /***
    44  	 * Stops the channel.  Once stopped, the channel is in the stopped state.
    45  	 *
    46  	 * @param timeout The amount of time the channel is allowed to take to gracefully stop.  If the timeout
    47  	 *        is exceeded, the channel should do a forcefull stop.
    48  	 *
    49  	 * @throws IOException
    50  	 */
    51      void stop(long timeout) throws IOException;
    52
    53  }