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.broker.scheduler.JobSchedulerStore;
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     *
028     */
029    public class JobSchedulerUsage extends Usage<JobSchedulerUsage> {
030    
031        private JobSchedulerStore store;
032    
033        public JobSchedulerUsage() {
034            super(null, null, 1.0f);
035        }
036    
037        public JobSchedulerUsage(String name, JobSchedulerStore store) {
038            super(null, name, 1.0f);
039            this.store = store;
040        }
041    
042        public JobSchedulerUsage(JobSchedulerUsage parent, String name) {
043            super(parent, name, 1.0f);
044            this.store = parent.store;
045        }
046    
047        @Override
048        protected long retrieveUsage() {
049            if (store == null) {
050                return 0;
051            }
052            return store.size();
053        }
054    
055        public JobSchedulerStore getStore() {
056            return store;
057        }
058    
059        public void setStore(JobSchedulerStore store) {
060            this.store = store;
061            onLimitChange();
062        }
063    }