| package org.apache.samoa.streams.fs; |
| |
| /* |
| * #%L |
| * SAMOA |
| * %% |
| * Copyright (C) 2014 - 2015 Apache Software Foundation |
| * %% |
| * Licensed 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. |
| * #L% |
| */ |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.file.FileSystems; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.IOUtils; |
| |
| /** |
| * Source for FileStream for HDFS files |
| * |
| * @author Casey |
| */ |
| public class HDFSFileStreamSource implements FileStreamSource { |
| |
| /** |
| * |
| */ |
| private static final long serialVersionUID = -3887354805787167400L; |
| |
| private transient InputStream fileStream; |
| private transient Configuration config; |
| private List<String> filePaths; |
| private int currentIndex; |
| |
| public HDFSFileStreamSource() { |
| this.currentIndex = -1; |
| } |
| |
| public void init(String path, String ext) { |
| this.init(this.getDefaultConfig(), path, ext); |
| } |
| |
| public void init(Configuration config, String path, String ext) { |
| this.config = config; |
| this.filePaths = new ArrayList<String>(); |
| Path hdfsPath = new Path(path); |
| FileSystem fs; |
| try { |
| fs = FileSystem.get(config); |
| FileStatus fileStat = fs.getFileStatus(hdfsPath); |
| if (fileStat.isDirectory()) { |
| Path filterPath = hdfsPath; |
| if (ext != null) { |
| filterPath = new Path(path.toString(), "*." + ext); |
| } |
| else { |
| filterPath = new Path(path.toString(), "*"); |
| } |
| FileStatus[] filesInDir = fs.globStatus(filterPath); |
| for (int i = 0; i < filesInDir.length; i++) { |
| if (filesInDir[i].isFile()) { |
| filePaths.add(filesInDir[i].getPath().toString()); |
| } |
| } |
| } |
| else { |
| this.filePaths.add(path); |
| } |
| } catch (IOException ioe) { |
| throw new RuntimeException("Failed getting list of files at:" + path, ioe); |
| } |
| |
| this.currentIndex = -1; |
| } |
| |
| private Configuration getDefaultConfig() { |
| String hadoopHome = System.getenv("HADOOP_HOME"); |
| Configuration conf = new Configuration(); |
| if (hadoopHome != null) { |
| java.nio.file.Path coreSitePath = FileSystems.getDefault().getPath(hadoopHome, "etc/hadoop/core-site.xml"); |
| java.nio.file.Path hdfsSitePath = FileSystems.getDefault().getPath(hadoopHome, "etc/hadoop/hdfs-site.xml"); |
| conf.addResource(new Path(coreSitePath.toAbsolutePath().toString())); |
| conf.addResource(new Path(hdfsSitePath.toAbsolutePath().toString())); |
| } |
| return conf; |
| } |
| |
| public void reset() throws IOException { |
| this.currentIndex = -1; |
| this.closeFileStream(); |
| } |
| |
| private void closeFileStream() { |
| IOUtils.closeStream(fileStream); |
| } |
| |
| public InputStream getNextInputStream() { |
| this.closeFileStream(); |
| if (this.currentIndex >= (this.filePaths.size() - 1)) |
| return null; |
| |
| this.currentIndex++; |
| String filePath = this.filePaths.get(currentIndex); |
| |
| Path hdfsPath = new Path(filePath); |
| FileSystem fs; |
| try { |
| fs = FileSystem.get(config); |
| fileStream = fs.open(hdfsPath); |
| } catch (IOException ioe) { |
| this.closeFileStream(); |
| throw new RuntimeException("Failed opening file:" + filePath, ioe); |
| } |
| |
| return fileStream; |
| } |
| |
| public InputStream getCurrentInputStream() { |
| return fileStream; |
| } |
| |
| protected int getFilePathListSize() { |
| if (filePaths != null) |
| return filePaths.size(); |
| return 0; |
| } |
| |
| protected String getFilePathAt(int index) { |
| if (filePaths != null && filePaths.size() > index) |
| return filePaths.get(index); |
| return null; |
| } |
| } |