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 */
017package org.apache.activemq.usage;
018
019import 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 */
030public 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}