| /* |
| * 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.nemo.runtime.executor.data.stores; |
| |
| import org.apache.nemo.runtime.executor.data.MemoryPoolAssigner; |
| import org.apache.nemo.common.exception.BlockFetchException; |
| import org.apache.nemo.common.exception.BlockWriteException; |
| import org.apache.nemo.conf.JobConf; |
| import org.apache.nemo.runtime.executor.data.DataUtil; |
| import org.apache.nemo.runtime.executor.data.SerializerManager; |
| import org.apache.nemo.runtime.executor.data.block.Block; |
| import org.apache.nemo.runtime.executor.data.block.FileBlock; |
| import org.apache.nemo.runtime.executor.data.metadata.LocalFileMetadata; |
| import org.apache.nemo.runtime.executor.data.streamchainer.Serializer; |
| import org.apache.reef.tang.annotations.Parameter; |
| |
| import javax.annotation.concurrent.ThreadSafe; |
| import javax.inject.Inject; |
| import java.io.File; |
| import java.io.IOException; |
| |
| /** |
| * Stores blocks in local files. |
| */ |
| @ThreadSafe |
| public final class LocalFileStore extends LocalBlockStore { |
| private final String fileDirectory; |
| |
| /** |
| * Constructor. |
| * |
| * @param fileDirectory the directory which will contain the files. |
| * @param serializerManager the serializer manager. |
| * @param memoryPoolAssigner the memory pool assigner. |
| */ |
| @Inject |
| private LocalFileStore(@Parameter(JobConf.FileDirectory.class) final String fileDirectory, |
| final SerializerManager serializerManager, |
| final MemoryPoolAssigner memoryPoolAssigner) { |
| super(serializerManager, memoryPoolAssigner); |
| this.fileDirectory = fileDirectory; |
| new File(fileDirectory).mkdirs(); |
| } |
| |
| @Override |
| public Block createBlock(final String blockId) { |
| deleteBlock(blockId); |
| |
| final Serializer serializer = getSerializerFromWorker(blockId); |
| final LocalFileMetadata metadata = new LocalFileMetadata(); |
| |
| return new FileBlock(blockId, serializer, DataUtil.blockIdToFilePath(blockId, fileDirectory), |
| metadata, getMemoryPoolAssigner()); |
| } |
| |
| /** |
| * Writes a committed block to this store. |
| * |
| * @param block the block to write. |
| * @throws BlockWriteException if fail to write. |
| */ |
| @Override |
| public void writeBlock(final Block block) throws BlockWriteException { |
| if (!(block instanceof FileBlock)) { |
| throw new BlockWriteException(new Throwable( |
| this.toString() + "only accept " + FileBlock.class.getName())); |
| } else if (!block.isCommitted()) { |
| throw new BlockWriteException(new Throwable("The block " + block.getId() + "is not committed yet.")); |
| } else { |
| getBlockMap().put(block.getId(), block); |
| } |
| } |
| |
| /** |
| * Removes the file that the target block is stored. |
| * |
| * @param blockId of the block. |
| * @return whether the block exists or not. |
| */ |
| @Override |
| public boolean deleteBlock(final String blockId) throws BlockFetchException { |
| final FileBlock fileBlock = (FileBlock) getBlockMap().remove(blockId); |
| if (fileBlock == null) { |
| return false; |
| } |
| try { |
| fileBlock.deleteFile(); |
| } catch (final IOException e) { |
| throw new BlockFetchException(e); |
| } |
| return true; |
| } |
| } |