/*

  * 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.reducers.array;

 import java.util.ArrayList;

 import org.apache.giraph.block_app.framework.api.BlockMasterApi;

 import org.apache.giraph.block_app.framework.piece.global_comm.BroadcastHandle;

 import org.apache.giraph.block_app.framework.piece.global_comm.ReducerHandle;

 import org.apache.giraph.block_app.framework.piece.global_comm.array.ArrayHandle;

 import org.apache.giraph.block_app.framework.piece.global_comm.array.BroadcastArrayHandle;

 import org.apache.giraph.block_app.framework.piece.global_comm.array.ReducerArrayHandle;

 import org.apache.giraph.function.Supplier;

 import org.apache.giraph.function.primitive.Int2ObjFunction;

 import org.apache.giraph.worker.WorkerBroadcastUsage;

 /**

  * ArrayHandle implemented as an array of individual handles.

  *

  * @param <H> Handle type

  */

 public class ArrayOfHandles<H> implements ArrayHandle<H> {

   protected final ArrayList<H> handles;

   public ArrayOfHandles(int count, Supplier<H> reduceHandleFactory) {

     handles = new ArrayList<>();

     for (int i = 0; i < count; i++) {

       handles.add(reduceHandleFactory.get());

     }

   }

   public ArrayOfHandles(int count, Int2ObjFunction<H> reduceHandleFactory) {

     handles = new ArrayList<>();

     for (int i = 0; i < count; i++) {

       handles.add(reduceHandleFactory.apply(i));

     }

   }

   @Override

   public H get(int index) {

     return handles.get(index);

   }

   @Override

   public int getStaticSize() {

     return handles.size();

   }

   /**

    * ReducerArrayHandle implemented as an array of separate reducer handles.

    *

    * @param <S> Handle type

    * @param <R> Reduce value type

    */

   public static class ArrayOfReducers<S, R>

       extends ArrayOfHandles<ReducerHandle<S, R>>

       implements ReducerArrayHandle<S, R> {

     public ArrayOfReducers(

         int count, Supplier<ReducerHandle<S, R>> reduceHandleFactory) {

       super(count, reduceHandleFactory);

     }

     public ArrayOfReducers(

         int count, Int2ObjFunction<ReducerHandle<S, R>> reduceHandleFactory) {

       super(count, reduceHandleFactory);

     }

     @Override

     public int getReducedSize(BlockMasterApi master) {

       return getStaticSize();

     }

     @Override

     public BroadcastArrayHandle<R> broadcastValue(final BlockMasterApi master) {

       return new ArrayOfBroadcasts<>(

           getStaticSize(),

           new Int2ObjFunction<BroadcastHandle<R>>() {

             @Override

             public BroadcastHandle<R> apply(int index) {

               return get(index).broadcastValue(master);

             }

           });

     }

   }

   /**

    * BroadcastArrayHandle implemented as an array of separate broadcast handles.

    *

    * @param <T> Handle type

    */

   public static class ArrayOfBroadcasts<T>

       extends ArrayOfHandles<BroadcastHandle<T>>

       implements BroadcastArrayHandle<T> {

     public ArrayOfBroadcasts(

         int count,

         Int2ObjFunction<BroadcastHandle<T>> broadcastHandleFactory) {

       super(count, broadcastHandleFactory);

     }

     public ArrayOfBroadcasts(

         int count,

         Supplier<BroadcastHandle<T>> broadcastHandleFactory) {

       super(count, broadcastHandleFactory);

     }

     @Override

     public int getBroadcastedSize(WorkerBroadcastUsage worker) {

       return getStaticSize();

     }

   }

 }