| /* |
| * 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.eagle.service.security.hdfs; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import org.apache.eagle.security.util.HadoopSecurityUtil; |
| 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.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * |
| * This class is responsible for all FileSystem Querying Operation |
| * Example |
| * List of Directories |
| * List of Files and It's Paths |
| * |
| * This internally it uses Hadoop FileSystem API to List the files |
| * |
| */ |
| public class HDFSFileSystem { |
| |
| private Configuration config; |
| |
| private static Logger LOG = LoggerFactory.getLogger(HDFSFileSystem.class); |
| |
| public HDFSFileSystem(Configuration hdfsConfig) { |
| config = hdfsConfig; |
| } |
| |
| public FileSystem getFileSystem() throws IOException { |
| HadoopSecurityUtil.login(config); |
| return FileSystem.get(config); |
| } |
| |
| /** |
| * Brows the Files for the specific Path |
| * |
| * @param filePath |
| * @return listOfFiles |
| * @throws Exception |
| */ |
| public List<FileStatus> browse(String filePath) throws Exception { |
| FileSystem hdfsFileSystem = null; |
| FileStatus[] listStatus; |
| try { |
| hdfsFileSystem = getFileSystem(); |
| Path path = new Path(filePath); |
| listStatus = hdfsFileSystem.listStatus( path ); |
| } catch ( Exception ex ) { |
| LOG.error(" Exception when browsing files for the path " +filePath , ex.getMessage() ); |
| throw new Exception(" Exception When browsing Files in HDFS .. Message : "+ex.getMessage()); |
| } finally { |
| //Close the file system |
| if( hdfsFileSystem != null ) hdfsFileSystem.close(); |
| } |
| return Arrays.asList(listStatus); |
| } |
| |
| } |