/*
    * 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.giraph.block_app.framework.api.BlockMasterApi;
  import org.apache.giraph.master.MasterGlobalCommUsage;
  import org.apache.giraph.worker.WorkerBroadcastUsage;
  
  /**
   * Handle that wraps both reducerHandle and broadcastHandle, so callers
   * don't need to have two fields.
   *
   * @param <S> Single value type
   * @param <R> Reduced value type
   */
  public class ReducerAndBroadcastWrapperHandle<S, R> {
    private ReducerHandle<S, R> reducerHandle;
    private BroadcastHandle<R> broadcastHandle;
  
    /** Set reducer handle to just registered handle */
    public void registeredReducer(ReducerHandle<S, R> reducerHandle) {
      this.reducerHandle = reducerHandle;
    }
  
    /** Reduce single value */
    public void reduce(S valueToReduce) {
      reducerHandle.reduce(valueToReduce);
    }
  
    /** Get reduced value */
    public R getReducedValue(MasterGlobalCommUsage master) {
      return reducerHandle.getReducedValue(master);
    }
  
    /**
     * Broadcast reduced value from master
     */
    public void broadcastValue(BlockMasterApi master) {
      broadcastHandle = reducerHandle.broadcastValue(master);
    }
  
    /** Get broadcasted value */
    public R getBroadcast(WorkerBroadcastUsage worker) {
      return broadcastHandle.getBroadcast(worker);
    }
  }