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
019package org.apache.hadoop.lib.service;
020
021import org.apache.hadoop.conf.Configuration;
022import org.apache.hadoop.fs.FileSystem;
023
024import java.io.IOException;
025
026public interface FileSystemAccess {
027
028  public interface FileSystemExecutor<T> {
029
030    public T execute(FileSystem fs) throws IOException;
031  }
032
033  public <T> T execute(String user, Configuration conf, FileSystemExecutor<T> executor) throws
034    FileSystemAccessException;
035
036  public FileSystem createFileSystem(String user, Configuration conf) throws IOException, FileSystemAccessException;
037
038  public void releaseFileSystem(FileSystem fs) throws IOException;
039
040  public Configuration getDefaultConfiguration();
041
042}