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.commons.monitoring.reporting.web.plugin.jvm.gauges;
018    
019    import org.apache.commons.monitoring.Role;
020    import org.apache.commons.monitoring.configuration.Configuration;
021    import org.apache.commons.monitoring.counters.Unit;
022    import org.apache.commons.monitoring.gauges.Gauge;
023    
024    import java.lang.management.ManagementFactory;
025    import java.lang.management.OperatingSystemMXBean;
026    
027    public class CPUGauge implements Gauge {
028        public static final Role CPU = new Role("CPU", Unit.UNARY);
029    
030        private static final OperatingSystemMXBean SYSTEM_MX_BEAN = ManagementFactory.getOperatingSystemMXBean();
031    
032        @Override
033        public Role role() {
034            return CPU;
035        }
036    
037        @Override
038        public double value() {
039            return SYSTEM_MX_BEAN.getSystemLoadAverage();
040        }
041    
042        @Override
043        public long period() {
044            return Configuration.getInteger(Configuration.COMMONS_MONITORING_PREFIX + "gauge.cpu.period", 4000);
045        }
046    }