001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.usage;
018    
019    import org.apache.activemq.store.kahadb.plist.PListStore;
020    
021    
022    /**
023     * Used to keep track of how much of something is being used so that a
024     * productive working set usage can be controlled. Main use case is manage
025     * memory usage.
026     * 
027     * @org.apache.xbean.XBean
028     * 
029     */
030    public class TempUsage extends Usage<TempUsage> {
031    
032        private PListStore store;
033    
034        public TempUsage() {
035            super(null, null, 1.0f);
036        }
037    
038        public TempUsage(String name, PListStore store) {
039            super(null, name, 1.0f);
040            this.store = store;
041        }
042    
043        public TempUsage(TempUsage parent, String name) {
044            super(parent, name, 1.0f);
045            this.store = parent.store;
046        }
047    
048        @Override
049        protected long retrieveUsage() {
050            if (store == null) {
051                return 0;
052            }
053            return store.size();
054        }
055    
056        public PListStore getStore() {
057            return store;
058        }
059    
060        public void setStore(PListStore store) {
061            this.store = store;
062            onLimitChange();
063        }
064    }