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; 018 019 020import org.apache.activemq.store.PListStore; 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 PercentLimitUsage<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 updateLimitBasedOnPercent(); 042 } 043 044 public TempUsage(TempUsage parent, String name) { 045 super(parent, name, 1.0f); 046 this.store = parent.store; 047 updateLimitBasedOnPercent(); 048 } 049 050 @Override 051 public int getPercentUsage() { 052 if (store != null) { 053 usageLock.writeLock().lock(); 054 try { 055 percentUsage = caclPercentUsage(); 056 } finally { 057 usageLock.writeLock().unlock(); 058 } 059 } 060 return super.getPercentUsage(); 061 } 062 063 @Override 064 protected long retrieveUsage() { 065 if (store == null) { 066 return 0; 067 } 068 return store.size(); 069 } 070 071 public PListStore getStore() { 072 return store; 073 } 074 075 public void setStore(PListStore store) { 076 this.store = store; 077 if (percentLimit > 0 && store != null) { 078 //will trigger onLimitChange 079 updateLimitBasedOnPercent(); 080 } else { 081 onLimitChange(); 082 } 083 } 084 085 @Override 086 protected void updateLimitBasedOnPercent() { 087 usageLock.writeLock().lock(); 088 try { 089 percentLimitFromFile(store != null ? store.getDirectory() : null); 090 } finally { 091 usageLock.writeLock().unlock(); 092 } 093 } 094 095}