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 }