/*
    * 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 + ")";
    }
  }