/*

  * 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.api.giraph;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 import java.util.List;

 import org.apache.giraph.block_app.framework.internal.BlockWorkerContextLogic;

 import org.apache.giraph.block_app.framework.internal.BlockWorkerPieces;

 import org.apache.giraph.block_app.framework.output.BlockOutputHandle;

 import org.apache.giraph.worker.WorkerContext;

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

 import org.apache.giraph.writable.kryo.markers.KryoIgnoreWritable;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 import org.apache.log4j.Logger;

 /**

  * WorkerContext that executes receiver and sender blocks passed

  * into BlockWorkerPieces.

  */

 public final class BlockWorkerContext extends WorkerContext

     implements KryoIgnoreWritable {

   public static final Logger LOG = Logger.getLogger(BlockWorkerContext.class);

   private BlockWorkerContextLogic workerLogic;

   @Override

   public void preApplication()

       throws InstantiationException, IllegalAccessException {

     workerLogic = new BlockWorkerContextLogic();

     workerLogic.preApplication(new BlockWorkerContextApiWrapper<>(this),

         new BlockOutputHandle(getContext().getJobID().toString(),

             getConf(), getContext()));

   }

   @Override

   public void preSuperstep() {

     List<Writable> messages = getAndClearMessagesFromOtherWorkers();

     BlockWorkerContextApiWrapper<WritableComparable, Writable> workerApi =

         new BlockWorkerContextApiWrapper<>(this);

     BlockWorkerPieces<Object> workerPieces =

         BlockWorkerPieces.getNextWorkerPieces(this);

     LOG.info("PassedComputation in " + getSuperstep() +

         " superstep executing " + workerPieces);

     workerLogic.preSuperstep(

         workerApi, workerApi, workerPieces, getSuperstep(), messages);

   }

   @Override

   public void postSuperstep() {

     workerLogic.postSuperstep();

   }

   @Override

   public void postApplication() {

     workerLogic.postApplication();

   }

   public Object getWorkerValue() {

     return workerLogic.getWorkerValue();

   }

   public BlockOutputHandle getOutputHandle() {

     return workerLogic.getOutputHandle();

   }

   // Cannot extend KryoWritable directly, since WorkerContext is

   // abstract class, not interface... Additionally conf in parent

   // class cannot be made transient.

   // So just add serialization of two individual fields.

   // (and adding KryoIgnoreWritable to avoid wrapping it twice)

   @Override

   public void write(DataOutput out) throws IOException {

     HadoopKryo.writeClassAndObj(out, workerLogic);

   }

   @Override

   public void readFields(DataInput in) throws IOException {

     workerLogic = HadoopKryo.readClassAndObj(in);

     workerLogic.getOutputHandle().initialize(getConf(), getContext());

   }

 }