/*
 * 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.hadoop.hdds.scm.container.replication;

import org.apache.hadoop.hdds.protocol.DatanodeDetails;
import org.apache.hadoop.hdds.scm.ha.SCMContext;
import org.apache.hadoop.hdds.server.events.EventHandler;
import org.apache.hadoop.hdds.server.events.EventPublisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Handles events related to the ReplicationManager.
 */
public class ReplicationManagerEventHandler implements EventHandler<DatanodeDetails> {

  private static final Logger LOG = LoggerFactory.getLogger(ReplicationManagerEventHandler.class);

  private final ReplicationManager replicationManager;
  private final SCMContext scmContext;

  public ReplicationManagerEventHandler(ReplicationManager replicationManager, SCMContext scmContext) {
    this.replicationManager = replicationManager;
    this.scmContext = scmContext;
  }

  @Override
  public void onMessage(DatanodeDetails datanodeDetails, EventPublisher eventPublisher) {
    if (!scmContext.isLeaderReady() || scmContext.isInSafeMode()) {
      // same condition in ReplicationManager
      return;
    }
    LOG.debug("ReplicationManagerEventHandler received event for datanode: {}", datanodeDetails);
    replicationManager.notifyNodeStateChange();
  }
}
