/*

  * 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 org.apache.giraph.aggregators.AggregatorUsage;

 import org.apache.hadoop.io.Writable;

 /**

  * Vertex classes can access and change aggregators through this interface

  */

 public interface WorkerAggregatorUsage extends AggregatorUsage {

   /**

    * Add a new value

    *

    * @param name Name of aggregator

    * @param value Value to add

    * @param <A> Aggregated value

    */

   <A extends Writable> void aggregate(String name, A value);

 }