content: /*
   *
   * 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.bookkeeper.replication;
  
  import java.util.concurrent.CountDownLatch;
  import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks.GenericCallback;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Callback which is getting notified when the replication process is enabled.
   */
  public class ReplicationEnableCb implements GenericCallback<Void> {
  
      private static final Logger LOG = LoggerFactory
              .getLogger(ReplicationEnableCb.class);
      private final CountDownLatch latch = new CountDownLatch(1);
  
      @Override
      public void operationComplete(int rc, Void result) {
          latch.countDown();
          if (LOG.isDebugEnabled()) {
              LOG.debug("Automatic ledger re-replication is enabled");
          }
      }
  
      /**
       * This is a blocking call and causes the current thread to wait until the
       * replication process is enabled.
       *
       * @throws InterruptedException
       *             interrupted while waiting
       */
      public void await() throws InterruptedException {
          if (LOG.isDebugEnabled()) {
              LOG.debug("Automatic ledger re-replication is disabled. Hence waiting until its enabled!");
          }
          latch.await();
      }
  }
  