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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.vfs2.cache;
18  
19  import java.lang.ref.Reference;
20  import java.lang.ref.ReferenceQueue;
21  import java.lang.ref.WeakReference;
22  
23  import org.apache.commons.vfs2.FileObject;
24  
25  /**
26   * This implementation caches every file as long as it is strongly reachable by the java vm. As soon as the object is no
27   * longer reachable it will be discarded. In contrast to the SoftRefFilesCache this implementation might free resources
28   * faster as it don't wait until a memory limitation.
29   *
30   * @see java.lang.ref.WeakReference
31   */
32  public class WeakRefFilesCache extends SoftRefFilesCache {
33  
34      @Override
35      protected Reference<FileObject> createReference(final FileObject file, final ReferenceQueue<FileObject> refqueue) {
36          return new WeakReference<>(file, refqueue);
37      }
38  }