/*
    * 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.zookeeper;
  
  import java.io.IOException;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.zookeeper.KeeperException;
  import org.apache.zookeeper.Watcher;
  import org.apache.zookeeper.ZooKeeper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A RecoverableZooKeeper instance which gives broken connections a number of times, and then
   * returns good connections.
   */
  public class SelfHealingRecoverableZooKeeper extends RecoverableZooKeeper {
    private static final Logger LOG = LoggerFactory.getLogger(SelfHealingRecoverableZooKeeper.class);
    private Watcher watcher;
    private int sessionTimeout;
    private String quorumServers;
    private final AtomicInteger counter;
  
    public SelfHealingRecoverableZooKeeper(String quorumServers, int sessionTimeout, Watcher watcher,
        int maxRetries, int retryIntervalMillis, int maxSleepTime, String identifier,
        int authFailedRetries, int authFailedPause, int numFailuresBeforeSuccess, int multiMaxSize)
        throws IOException {
      super(quorumServers, sessionTimeout, watcher, maxRetries, retryIntervalMillis, maxSleepTime,
          identifier, authFailedRetries, authFailedPause, multiMaxSize);
      this.quorumServers = quorumServers;
      this.sessionTimeout = sessionTimeout;
      this.watcher = watcher;
      this.counter = new AtomicInteger(numFailuresBeforeSuccess);
    }
  
    @Override
    ZooKeeper createNewZooKeeper() throws KeeperException {
      try {
        int remaining = counter.getAndDecrement();
        // Construct our "special" ZooKeeper instance
        AuthFailingZooKeeper zk = new AuthFailingZooKeeper(quorumServers, sessionTimeout, watcher);
        if (remaining > 0) {
          zk.triggerAuthFailed();
        }
        return zk;
      } catch (IOException ex) {
        LOG.warn("Unable to create ZooKeeper Connection", ex);
        throw new KeeperException.OperationTimeoutException();
      }
    }
  }