/*

  * 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.collect;

 import java.util.ArrayList;

 import java.util.List;

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

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

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

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

 import org.apache.giraph.master.MasterGlobalCommUsage;

 import org.apache.giraph.reducers.ReduceOperation;

 import org.apache.giraph.types.ops.PrimitiveTypeOps;

 import org.apache.giraph.types.ops.TypeOpsUtils;

 import org.apache.giraph.types.ops.collections.array.WArrayList;

 import org.apache.giraph.worker.WorkerBroadcastUsage;

 import org.apache.giraph.writable.kryo.KryoWritableWrapper;

 /**

  * ShardedReducerHandle where we keep a list of reduced values,

  * and values consist of multiple primitives, so we keep one primitive

  * list for each

  */

 @SuppressWarnings("unchecked")

 public class CollectShardedTuplesOfPrimitivesReducerHandle

 extends ShardedReducerHandle<List<Object>, List<WArrayList>> {

   /**

    * Type ops if available, or null

    */

   private final List<PrimitiveTypeOps> typeOpsList;

   public CollectShardedTuplesOfPrimitivesReducerHandle(

       final CreateReducersApi reduceApi, Class<?>... valueClasses) {

     typeOpsList = new ArrayList<>();

     for (Class<?> valueClass : valueClasses) {

       typeOpsList.add(TypeOpsUtils.getPrimitiveTypeOps(valueClass));

     }

     register(reduceApi);

   }

   public List<Object> createSingleValue() {

     List<Object> ret = new ArrayList<>();

     for (PrimitiveTypeOps typeOps : typeOpsList) {

       ret.add(typeOps.create());

     }

     return ret;

   }

   @Override

   public ReduceOperation<List<Object>,

       KryoWritableWrapper<List<WArrayList>>> createReduceOperation() {

     return new CollectTuplesOfPrimitivesReduceOperation(typeOpsList);

   }

   @Override

   public List<WArrayList> createReduceResult(

       MasterGlobalCommUsage master) {

     int size = 0;

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

       size += reducers.get(i).getReducedValue(master).get().get(0).size();

     }

     return createLists(size);

   }

   public List<WArrayList> createLists(int size) {

     List<WArrayList> ret = new ArrayList<>();

     for (PrimitiveTypeOps typeOps : typeOpsList) {

       ret.add(typeOps.createArrayList(size));

     }

     return ret;

   }

   @Override

   public BroadcastHandle<List<WArrayList>> createBroadcastHandle(

       BroadcastArrayHandle<KryoWritableWrapper<List<WArrayList>>>

           broadcasts) {

     return new CollectShardedTuplesOfPrimitivesBroadcastHandle(broadcasts);

   }

   /**

    * BroadcastHandle for CollectShardedTuplesOfPrimitivesReducerHandle

    */

   public class CollectShardedTuplesOfPrimitivesBroadcastHandle

       extends ShardedBroadcastHandle {

     public CollectShardedTuplesOfPrimitivesBroadcastHandle(

         BroadcastArrayHandle<KryoWritableWrapper<List<WArrayList>>>

             broadcasts) {

       super(broadcasts);

     }

     @Override

     public List<WArrayList> createBroadcastResult(

         WorkerBroadcastUsage worker) {

       int size = 0;

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

         size += broadcasts.get(i).getBroadcast(worker).get().size();

       }

       return createLists(size);

     }

   }

   /**

    * Reduce broadcast wrapper

    */

   public static class CollectShardedTuplesOfPrimitivesReduceBroadcast {

     private CollectShardedTuplesOfPrimitivesReducerHandle reducerHandle;

     private BroadcastHandle<List<WArrayList>> broadcastHandle;

     /** Set reducer handle to just registered handle */

     public void registeredReducer(CreateReducersApi reduceApi,

         Class<?>... valueClasses) {

       this.reducerHandle = new CollectShardedTuplesOfPrimitivesReducerHandle(

           reduceApi, valueClasses);

     }

     public List<Object> createSingleValue() {

       return reducerHandle.createSingleValue();

     }

     /** Reduce single value */

     public void reduce(List<Object> valueToReduce) {

       reducerHandle.reduce(valueToReduce);

     }

     /** Get reduced value */

     public List<WArrayList> 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 List<WArrayList> getBroadcast(WorkerBroadcastUsage worker) {

       return broadcastHandle.getBroadcast(worker);

     }

   }

 }