01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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.vfs.cache;
18:
19: import org.apache.commons.vfs.FileObject;
20:
21: import java.lang.ref.Reference;
22: import java.lang.ref.ReferenceQueue;
23: import java.lang.ref.WeakReference;
24:
25: /**
26: * This implementation caches every file as long as it is strongly reachable by
27: * the java vm. As soon as the object is no longer reachable it will be discarded.
28: * In contrast to the SoftRefFilesCache this implementation might free resources faster
29: * as it don't wait until a memory limitation.
30: *
31: * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
32: * @version $Revision: 485638 $ $Date: 2005-09-30 09:02:41 +0200 (Fr, 30 Sep
33: * 2005) $
34: * @see java.lang.ref.WeakReference
35: */
36: public class WeakRefFilesCache extends SoftRefFilesCache {
37: protected Reference createReference(FileObject file,
38: ReferenceQueue refqueue) {
39: return new WeakReference(file, refqueue);
40: }
41: }
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