/*

  * 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.worker;

 import java.io.IOException;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.graph.VertexEdgeCount;

 import org.apache.giraph.io.GiraphInputFormat;

 import org.apache.giraph.io.MappingInputFormat;

 import org.apache.giraph.io.MappingReader;

 import org.apache.giraph.mapping.MappingEntry;

 import org.apache.giraph.mapping.MappingStore;

 import org.apache.giraph.io.InputType;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 import org.apache.hadoop.mapreduce.InputSplit;

 import org.apache.hadoop.mapreduce.Mapper;

 /**

  * Load as many mapping input splits as possible.

  * Every thread will has its own instance of WorkerClientRequestProcessor

  * to send requests.

  *

  * @param <I> vertexId type

  * @param <V> vertexValue type

  * @param <E> edgeValue type

  * @param <B> mappingTarget type

  */

 @SuppressWarnings("unchecked")

 public class MappingInputSplitsCallable<I extends WritableComparable,

   V extends Writable, E extends Writable, B extends Writable>

   extends InputSplitsCallable<I, V, E> {

   /** User supplied mappingInputFormat */

   private final MappingInputFormat<I, V, E, B> mappingInputFormat;

   /** Link to bspServiceWorker */

   private final BspServiceWorker<I, V, E> bspServiceWorker;

   /**

    * Constructor

    *

    * @param mappingInputFormat mappingInputFormat

    * @param context Context

    * @param configuration Configuration

    * @param bspServiceWorker bsp service worker

    * @param splitsHandler Splits handler

    */

   public MappingInputSplitsCallable(

       MappingInputFormat<I, V, E, B> mappingInputFormat,

       Mapper<?, ?, ?, ?>.Context context,

       ImmutableClassesGiraphConfiguration<I, V, E> configuration,

       BspServiceWorker<I, V, E> bspServiceWorker,

       WorkerInputSplitsHandler splitsHandler) {

     super(context, configuration, bspServiceWorker, splitsHandler);

     this.mappingInputFormat = mappingInputFormat;

     this.bspServiceWorker = bspServiceWorker;

   }

   @Override

   public GiraphInputFormat getInputFormat() {

     return mappingInputFormat;

   }

   @Override

   public InputType getInputType() {

     return InputType.MAPPING;

   }

   @Override

   protected VertexEdgeCount readInputSplit(InputSplit inputSplit)

     throws IOException, InterruptedException {

     MappingReader<I, V, E, B> mappingReader =

         mappingInputFormat.createMappingReader(inputSplit, context);

     mappingReader.setConf(configuration);

     WorkerThreadGlobalCommUsage globalCommUsage = this.bspServiceWorker

         .getAggregatorHandler().newThreadAggregatorUsage();

     mappingReader.initialize(inputSplit, context);

     mappingReader.setWorkerGlobalCommUsage(globalCommUsage);

     int entriesLoaded = 0;

     MappingStore<I, B> mappingStore =

       (MappingStore<I, B>) bspServiceWorker.getLocalData().getMappingStore();

     while (mappingReader.nextEntry()) {

       MappingEntry<I, B> entry = mappingReader.getCurrentEntry();

       entriesLoaded += 1;

       mappingStore.addEntry(entry.getVertexId(), entry.getMappingTarget());

     }

     return new VertexEdgeCount(0, 0, entriesLoaded);

   }

 }