helix-core/src/main/java/org/apache/helix/controller/stages/resource/ResourceMessageGenerationPhase.java

package org.apache.helix.controller.stages.resource;

/*
 * 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.
 */

import org.apache.helix.controller.stages.AttributeName;
import org.apache.helix.controller.stages.BestPossibleStateOutput;
import org.apache.helix.controller.stages.ClusterEvent;
import org.apache.helix.controller.stages.IntermediateStateOutput;
import org.apache.helix.controller.stages.MessageGenerationPhase;

/**
 * Compares the currentState, pendingState with IdealState and generate messages for regular resource
 */
public class ResourceMessageGenerationPhase extends MessageGenerationPhase {
  @Override
  public void process(ClusterEvent event) throws Exception {
    BestPossibleStateOutput bestPossibleStateOutput =
        event.getAttribute(AttributeName.BEST_POSSIBLE_STATE.name());
    processEvent(event, bestPossibleStateOutput);
  }
}