| /* |
| * 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.ImmutableClassesGiraphConfigurable; |
| import org.apache.giraph.metrics.AggregatedMetrics; |
| import org.apache.giraph.partition.PartitionStats; |
| |
| import java.util.List; |
| |
| /** |
| * Observer for Master. |
| * It can implement ContextSettable if it needs to access job counters. |
| */ |
| public interface MasterObserver extends ImmutableClassesGiraphConfigurable { |
| /** |
| * Before application begins. |
| */ |
| void preApplication(); |
| |
| /** |
| * After application ends. |
| */ |
| void postApplication(); |
| |
| /** |
| * If there is an error during the application. |
| * |
| * @param e Exception that caused failure. May be null. |
| */ |
| void applicationFailed(Exception e); |
| |
| /** |
| * Before each superstep starts. |
| * |
| * @param superstep The superstep number |
| */ |
| void preSuperstep(long superstep); |
| |
| /** |
| * After each superstep ends. |
| * |
| * @param superstep The superstep number |
| */ |
| void postSuperstep(long superstep); |
| |
| /** |
| * Called after each superstep with aggregated metrics from workers |
| * |
| * @param superstep Supsertep number |
| * @param aggregatedMetrics Metrics |
| * @param partitionStatsList List of partition stats |
| */ |
| void superstepMetricsUpdate( |
| long superstep, AggregatedMetrics aggregatedMetrics, |
| List<PartitionStats> partitionStatsList); |
| } |