/*

  * 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.giraph.master;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.metrics.AggregatedMetrics;

 import org.apache.giraph.partition.PartitionStats;

 import java.util.List;

 /**

  * A no-op implementation of MasterObserver to make it easier for users.

  */

 public class DefaultMasterObserver implements MasterObserver {

   /** Configuration to use */

   private ImmutableClassesGiraphConfiguration conf;

   @Override

   public void setConf(ImmutableClassesGiraphConfiguration configuration) {

     this.conf = configuration;

   }

   @Override

   public ImmutableClassesGiraphConfiguration getConf() {

     return conf;

   }

   @Override

   public void preApplication() { }

   @Override

   public void postApplication() { }

   @Override

   public void applicationFailed(Exception e) { }

   @Override

   public void preSuperstep(long superstep) { }

   @Override

   public void postSuperstep(long superstep) { }

   @Override

   public void superstepMetricsUpdate(long superstep,

       AggregatedMetrics aggregatedMetrics,

       List<PartitionStats> partitionStatsList) { }

 }