storm-server/src/main/java/org/apache/storm/nimbus/ITopologyActionNotifierPlugin.java

/**
 * 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.storm.nimbus;

import java.util.Map;

/**
 * A plugin interface that gets invoked any time there is an action for a topology.
 */
public interface ITopologyActionNotifierPlugin {

    /**
     * Called once during nimbus initialization.
     */
    void prepare(Map<String, Object> stormConf);

    /**
     * When a new actions is executed for a topology, this method will be called.
     */
    void notify(String topologyName, String action);

    /**
     * Called during shutdown.
     */
    void cleanup();
}