/*
 *
 * 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.replication;

import java.util.List;

import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Abortable;
import org.apache.hadoop.hbase.zookeeper.ZKUtil;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.zookeeper.KeeperException;

@InterfaceAudience.Private
public class ReplicationQueuesClientZKImpl extends ReplicationStateZKBase implements
    ReplicationQueuesClient {

  public ReplicationQueuesClientZKImpl(final ZooKeeperWatcher zk, Configuration conf,
      Abortable abortable) {
    super(zk, conf, abortable);
  }

  @Override
  public void init() throws ReplicationException {
    try {
      ZKUtil.createWithParents(this.zookeeper, this.queuesZNode);
    } catch (KeeperException e) {
      throw new ReplicationException("Internal error while initializing a queues client", e);
    }
  }

  @Override
  public List<String> getLogsInQueue(String serverName, String queueId) {
    String znode = ZKUtil.joinZNode(this.queuesZNode, serverName);
    znode = ZKUtil.joinZNode(znode, queueId);
    List<String> result = null;
    try {
      result = ZKUtil.listChildrenNoWatch(this.zookeeper, znode);
    } catch (KeeperException e) {
      this.abortable.abort("Failed to get list of wals for queueId=" + queueId
          + " and serverName=" + serverName, e);
    }
    return result;
  }

  @Override
  public List<String> getAllQueues(String serverName) {
    String znode = ZKUtil.joinZNode(this.queuesZNode, serverName);
    List<String> result = null;
    try {
      result = ZKUtil.listChildrenNoWatch(this.zookeeper, znode);
    } catch (KeeperException e) {
      this.abortable.abort("Failed to get list of queues for serverName=" + serverName, e);
    }
    return result;
  }

}