/*

  * 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.block_app.framework.piece.global_comm;

 import org.apache.hadoop.io.DoubleWritable;

 import org.apache.hadoop.io.FloatWritable;

 import org.apache.hadoop.io.IntWritable;

 import org.apache.hadoop.io.LongWritable;

 /**

  * Utility object with common primitive reduce operations,

  * without need to create reusable objects within the piece.

  */

 public class ReduceUtilsObject {

   private final DoubleWritable reusableDouble = new DoubleWritable();

   private final FloatWritable reusableFloat = new FloatWritable();

   private final LongWritable reusableLong = new LongWritable();

   private final IntWritable reusableInt = new IntWritable();

   // utility functions:

   public void reduceDouble(

       ReducerHandle<DoubleWritable, ?> reduceHandle, double value) {

     DoubleWritable tmp = reusableDouble;

     tmp.set(value);

     reduceHandle.reduce(tmp);

   }

   public void reduceFloat(

       ReducerHandle<FloatWritable, ?> reduceHandle, float value) {

     FloatWritable tmp = reusableFloat;

     tmp.set(value);

     reduceHandle.reduce(tmp);

   }

   public void reduceLong(

       ReducerHandle<LongWritable, ?> reduceHandle, long value) {

     LongWritable tmp = reusableLong;

     tmp.set(value);

     reduceHandle.reduce(tmp);

   }

   public void reduceInt(ReducerHandle<IntWritable, ?> reduceHandle, int value) {

     IntWritable tmp = reusableInt;

     tmp.set(value);

     reduceHandle.reduce(tmp);

   }

 }