org.apache.apex.engine.plugin.ApexPluginDispatcher.java Source code

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Here is the source code for org.apache.apex.engine.plugin.ApexPluginDispatcher.java

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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.apex.engine.plugin;

import org.apache.apex.api.plugin.Event;
import org.apache.hadoop.service.Service;

import com.datatorrent.api.DAG;

/**
 * @since 3.6.0
 */
public interface ApexPluginDispatcher extends Service {

    /**
     * This is internal event, which is not delivered to the plugins.
     */
    Event.Type DAG_CHANGE = new Event.Type() {
    };

    class DAGChangeEvent extends Event.BaseEvent<Event.Type> {
        final DAG dag;

        public DAGChangeEvent(DAG dag) {
            super(DAG_CHANGE);
            this.dag = dag;
        }
    }

    void dispatch(Event e);
}