| /* |
| * 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 com.google.common.base.Preconditions; |
| import org.apache.giraph.bsp.BspService; |
| import org.apache.giraph.comm.messages.MessageStore; |
| import org.apache.giraph.ooc.OutOfCoreEngine; |
| import org.apache.giraph.ooc.data.DiskBackedEdgeStore; |
| import org.apache.giraph.ooc.data.DiskBackedMessageStore; |
| import org.apache.giraph.ooc.data.DiskBackedPartitionStore; |
| |
| import java.io.IOException; |
| |
| /** |
| * IOCommand to load partition data, edge data (if in INPUT_SUPERSTEP), and |
| * message data (if in compute supersteps). Also, this command can be used to |
| * prefetch a partition to be processed in the next superstep. |
| */ |
| public class LoadPartitionIOCommand extends IOCommand { |
| /** |
| * Which superstep this partition should be loaded for? (can be current |
| * superstep or next superstep -- in case of prefetching). |
| */ |
| private final long superstep; |
| |
| /** |
| * Constructor |
| * |
| * @param oocEngine out-of-core engine |
| * @param partitionId id of the partition to be loaded |
| * @param superstep superstep to load the partition for |
| */ |
| public LoadPartitionIOCommand(OutOfCoreEngine oocEngine, int partitionId, |
| long superstep) { |
| super(oocEngine, partitionId); |
| this.superstep = superstep; |
| } |
| |
| @Override |
| public boolean execute() throws IOException { |
| boolean executed = false; |
| if (oocEngine.getMetaPartitionManager() |
| .startLoadingPartition(partitionId, superstep)) { |
| long currentSuperstep = oocEngine.getSuperstep(); |
| DiskBackedPartitionStore partitionStore = |
| (DiskBackedPartitionStore) |
| oocEngine.getServerData().getPartitionStore(); |
| numBytesTransferred += |
| partitionStore.loadPartitionData(partitionId); |
| if (currentSuperstep == BspService.INPUT_SUPERSTEP && |
| superstep == currentSuperstep) { |
| DiskBackedEdgeStore edgeStore = |
| (DiskBackedEdgeStore) oocEngine.getServerData().getEdgeStore(); |
| numBytesTransferred += |
| edgeStore.loadPartitionData(partitionId); |
| } |
| MessageStore messageStore; |
| if (currentSuperstep == superstep) { |
| messageStore = oocEngine.getServerData().getCurrentMessageStore(); |
| } else { |
| Preconditions.checkState(superstep == currentSuperstep + 1); |
| messageStore = oocEngine.getServerData().getIncomingMessageStore(); |
| } |
| if (messageStore != null) { |
| numBytesTransferred += ((DiskBackedMessageStore) messageStore) |
| .loadPartitionData(partitionId); |
| } |
| oocEngine.getMetaPartitionManager() |
| .doneLoadingPartition(partitionId, superstep); |
| executed = true; |
| } |
| return executed; |
| } |
| |
| @Override |
| public IOCommandType getType() { |
| return IOCommandType.LOAD_PARTITION; |
| } |
| |
| @Override |
| public String toString() { |
| return "LoadPartitionIOCommand: (partitionId = " + partitionId + ", " + |
| "superstep = " + superstep + ")"; |
| } |
| } |