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/**
 * 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.
 */
package org.apache.xbean.kernel;

/**
 * This interface is used to monitor service lifecycle events.  A ServiceMonitor can be registered with a kernel using
 * {@link Kernel#addServiceMonitor(ServiceMonitor)} or {@link Kernel#addServiceMonitor(ServiceMonitor, ServiceName)}.
 *
 * @author Dain Sundstrom
 * @version $Id$
 * @since 2.0
 */
public interface ServiceMonitor {
    /**
     * A new service has been registered with the kernel.
     *
     * @param serviceEvent the event information
     */
    void serviceRegistered(ServiceEvent serviceEvent);

    /**
     * A service has entered the STARTING state.
     *
     * @param serviceEvent the event information
     */
    void serviceStarting(ServiceEvent serviceEvent);

    /**
     * A service is waiting to start because some start conditions are unsatified.
     *
     * @param serviceEvent the event information
     * @see ServiceEvent#getUnsatisfiedConditions()
     */
    void serviceWaitingToStart(ServiceEvent serviceEvent);

    /**
     * An error occured while calling creating the service.
     *
     * @param serviceEvent the event information
     * @see ServiceEvent#getCause()
     */
    void serviceStartError(ServiceEvent serviceEvent);

    /**
     * A service has entered the RUNNING state.
     *
     * @param serviceEvent the event information
     */
    void serviceRunning(ServiceEvent serviceEvent);

    /**
     * A service has entered the RUNNING state.
     *
     * @param serviceEvent the event information
     */
    void serviceStopping(ServiceEvent serviceEvent);

    /**
     * A service is waiting to stop because some stop condition is unsatified.
     *
     * @param serviceEvent the event information
     * @see ServiceEvent#getUnsatisfiedConditions()
     */
    void serviceWaitingToStop(ServiceEvent serviceEvent);

    /**
     * An error occured while calling destroying the service.
     *
     * @param serviceEvent the event information
     * @see ServiceEvent#getCause()
     */
    void serviceStopError(ServiceEvent serviceEvent);

    /**
     * A service has entered the STOPPED state.
     *
     * @param serviceEvent the event information
     */
    void serviceStopped(ServiceEvent serviceEvent);

    /**
     * A service has been unregistered from the kernel.
     *
     * @param serviceEvent the event information
     */
    void serviceUnregistered(ServiceEvent serviceEvent);
}