watchdog.java

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/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * All rights reserved.                                                *
 * ------------------------------------------------------------------- *
 * Licensed 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.                      *
 ***********************************************************************/

package org.apache.james.util.watchdog;

/**
 * This interface represents an abstract watchdog process that serves to
 * monitor a situation and triggers an action under an implementation-specific
 * trigger condition.
 *
 */
public interface Watchdog {

    /**
     * Start this Watchdog, causing it to begin monitoring.  The Watchdog can
     * be stopped and restarted.
     */
    void start();

    /**
     * Reset this Watchdog.  Resets any conditions in the implementations
     * (time to expiration, etc.) to their original values
     */
    void reset();

    /**
     * Stop this Watchdog, terminating the monitoring condition.  The monitor
     * can be restarted with a call to startWatchdog.
     */
    void stop();
}