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    }