| /** |
| * 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.apex.malhar.lib.fileaccess; |
| |
| import java.io.IOException; |
| |
| import javax.validation.constraints.NotNull; |
| |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.FileContext; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.LocatedFileStatus; |
| import org.apache.hadoop.fs.Options.Rename; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.RemoteIterator; |
| |
| import com.datatorrent.netlet.util.DTThrowable; |
| |
| /** |
| * Hadoop file system backed store. |
| * |
| * @since 2.0.0 |
| */ |
| @InterfaceStability.Evolving |
| public abstract class FileAccessFSImpl implements FileAccess |
| { |
| @NotNull |
| private String basePath; |
| protected transient FileSystem fs; |
| |
| public FileAccessFSImpl() |
| { |
| } |
| |
| public String getBasePath() |
| { |
| return basePath; |
| } |
| |
| public void setBasePath(String path) |
| { |
| this.basePath = path; |
| } |
| |
| protected Path getFilePath(long bucketKey, String fileName) |
| { |
| return new Path(getBucketPath(bucketKey), fileName); |
| } |
| |
| protected Path getBucketPath(long bucketKey) |
| { |
| return new Path(basePath, Long.toString(bucketKey)); |
| } |
| |
| @Override |
| public long getFileSize(long bucketKey, String fileName) throws IOException |
| { |
| return fs.getFileStatus(getFilePath(bucketKey, fileName)).getLen(); |
| } |
| |
| @Override |
| public void close() throws IOException |
| { |
| fs.close(); |
| } |
| |
| @Override |
| public void init() |
| { |
| if (fs == null) { |
| Path dataFilePath = new Path(basePath); |
| try { |
| fs = FileSystem.newInstance(dataFilePath.toUri(), new Configuration()); |
| } catch (IOException e) { |
| DTThrowable.rethrow(e); |
| } |
| } |
| } |
| |
| @Override |
| public void delete(long bucketKey, String fileName) throws IOException |
| { |
| fs.delete(getFilePath(bucketKey, fileName), true); |
| } |
| |
| @Override |
| public FSDataOutputStream getOutputStream(long bucketKey, String fileName) throws IOException |
| { |
| Path path = getFilePath(bucketKey, fileName); |
| return fs.create(path, true); |
| } |
| |
| @Override |
| public FSDataInputStream getInputStream(long bucketKey, String fileName) throws IOException |
| { |
| return fs.open(getFilePath(bucketKey, fileName)); |
| } |
| |
| @Override |
| public void rename(long bucketKey, String fromName, String toName) throws IOException |
| { |
| FileContext fc = FileContext.getFileContext(fs.getUri()); |
| Path bucketPath = getBucketPath(bucketKey); |
| // file context requires absolute path |
| if (!bucketPath.isAbsolute()) { |
| bucketPath = new Path(fs.getWorkingDirectory(), bucketPath); |
| } |
| fc.rename(new Path(bucketPath, fromName), new Path(bucketPath, toName), Rename.OVERWRITE); |
| } |
| |
| @Override |
| public boolean exists(long bucketKey, String fileName) throws IOException |
| { |
| return fs.exists(getFilePath(bucketKey, fileName)); |
| } |
| |
| @Override |
| public RemoteIterator<LocatedFileStatus> listFiles(long bucketKey) throws IOException |
| { |
| Path bucketPath = getBucketPath(bucketKey); |
| return fs.exists(bucketPath) ? fs.listFiles(bucketPath, true) : null; |
| } |
| |
| @Override |
| public void deleteBucket(long bucketKey) throws IOException |
| { |
| fs.delete(getBucketPath(bucketKey), true); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return this.getClass().getSimpleName() + "[basePath=" + basePath + "]"; |
| } |
| |
| } |