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.fs.http.server;
020
021import org.apache.hadoop.classification.InterfaceAudience;
022import org.apache.hadoop.lib.service.FileSystemAccess;
023import org.apache.hadoop.lib.servlet.FileSystemReleaseFilter;
024
025/**
026 * Filter that releases FileSystemAccess filesystem instances upon HTTP request
027 * completion.
028 */
029@InterfaceAudience.Private
030public class HttpFSReleaseFilter extends FileSystemReleaseFilter {
031
032  /**
033   * Returns the {@link FileSystemAccess} service to return the FileSystemAccess filesystem
034   * instance to.
035   *
036   * @return the FileSystemAccess service.
037   */
038  @Override
039  protected FileSystemAccess getFileSystemAccess() {
040    return HttpFSServerWebApp.get().get(FileSystemAccess.class);
041  }
042
043}