/*

  * 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.ooc.command;

 import org.apache.giraph.bsp.BspService;

 import org.apache.giraph.comm.messages.MessageStore;

 import org.apache.giraph.ooc.data.DiskBackedEdgeStore;

 import org.apache.giraph.ooc.data.DiskBackedMessageStore;

 import org.apache.giraph.ooc.data.DiskBackedPartitionStore;

 import org.apache.giraph.ooc.OutOfCoreEngine;

 import java.io.IOException;

 /**

  * IOCommand to store partition data, edge data (if in INPUT_SUPERSTEP), and

  * message data (if in compute supersteps).

  */

 public class StorePartitionIOCommand extends IOCommand {

   /**

    * Constructor

    *

    * @param oocEngine out-of-core engine

    * @param partitionId id of the partition to store its data

    */

   public StorePartitionIOCommand(OutOfCoreEngine oocEngine,

                                  int partitionId) {

     super(oocEngine, partitionId);

   }

   @Override

   public boolean execute() throws IOException {

     boolean executed = false;

     if (oocEngine.getMetaPartitionManager()

         .startOffloadingPartition(partitionId)) {

       DiskBackedPartitionStore partitionStore =

           (DiskBackedPartitionStore)

               oocEngine.getServerData().getPartitionStore();

       numBytesTransferred +=

           partitionStore.offloadPartitionData(partitionId);

       if (oocEngine.getSuperstep() != BspService.INPUT_SUPERSTEP) {

         MessageStore messageStore =

             oocEngine.getServerData().getCurrentMessageStore();

         if (messageStore != null) {

           numBytesTransferred += ((DiskBackedMessageStore) messageStore)

               .offloadPartitionData(partitionId);

         }

       } else {

         DiskBackedEdgeStore edgeStore =

             (DiskBackedEdgeStore)

                 oocEngine.getServerData().getEdgeStore();

         numBytesTransferred +=

             edgeStore.offloadPartitionData(partitionId);

       }

       oocEngine.getMetaPartitionManager().doneOffloadingPartition(partitionId);

       executed = true;

     }

     return executed;

   }

   @Override

   public IOCommandType getType() {

     return IOCommandType.STORE_PARTITION;

   }

   @Override

   public String toString() {

     return "StorePartitionIOCommand: (partitionId = " + partitionId + ")";

   }

 }