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.kaha.Store; 020 021 /** 022 * Used to keep track of how much of something is being used so that a 023 * productive working set usage can be controlled. Main use case is manage 024 * memory usage. 025 * 026 * @org.apache.xbean.XBean 027 * @version $Revision: 1.3 $ 028 */ 029 public class TempUsage extends Usage<TempUsage> { 030 031 private Store store; 032 033 public TempUsage() { 034 super(null, null, 1.0f); 035 } 036 037 public TempUsage(String name, Store store) { 038 super(null, name, 1.0f); 039 this.store = store; 040 } 041 042 public TempUsage(TempUsage parent, String name) { 043 super(parent, name, 1.0f); 044 this.store = parent.store; 045 } 046 047 protected long retrieveUsage() { 048 if (store == null) { 049 return 0; 050 } 051 return store.size(); 052 } 053 054 public Store getStore() { 055 return store; 056 } 057 058 public void setStore(Store store) { 059 this.store = store; 060 onLimitChange(); 061 } 062 }