001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019 package org.apache.hadoop.lib.service;
020
021 import org.apache.hadoop.classification.InterfaceAudience;
022 import org.apache.hadoop.conf.Configuration;
023 import org.apache.hadoop.fs.FileSystem;
024
025 import java.io.IOException;
026
027 @InterfaceAudience.Private
028 public interface FileSystemAccess {
029
030 public interface FileSystemExecutor<T> {
031
032 public T execute(FileSystem fs) throws IOException;
033 }
034
035 public <T> T execute(String user, Configuration conf, FileSystemExecutor<T> executor) throws
036 FileSystemAccessException;
037
038 public FileSystem createFileSystem(String user, Configuration conf) throws IOException, FileSystemAccessException;
039
040 public void releaseFileSystem(FileSystem fs) throws IOException;
041
042 public Configuration getFileSystemConfiguration();
043
044 }