/**
    * 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.hbase.master.cleaner;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.ScheduledChore;
  import org.apache.hadoop.hbase.Stoppable;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  
  /**
   * Chore that will clean the replication queues belonging to the peer which does not exist.
   */
  @InterfaceAudience.Private
  public class ReplicationZKNodeCleanerChore extends ScheduledChore {
    private static final Log LOG = LogFactory.getLog(ReplicationZKNodeCleanerChore.class);
    private final ReplicationZKNodeCleaner cleaner;
  
    public ReplicationZKNodeCleanerChore(Stoppable stopper, int period,
        ReplicationZKNodeCleaner cleaner) {
      super("ReplicationZKNodeCleanerChore", stopper, period);
      this.cleaner = cleaner;
    }
  
    @Override
    protected void chore() {
      try {
        Map<String, List<String>> undeletedQueues = cleaner.getUnDeletedQueues();
        cleaner.removeQueues(undeletedQueues);
      } catch (IOException e) {
        LOG.warn("Failed to clean replication zk node", e);
      }
    }
  
  }