| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.servicecomb.huaweicloud.dashboard.monitor.data; |
| |
| |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.OperatingSystemMXBean; |
| import java.lang.management.ThreadMXBean; |
| |
| public class CPUMonitorCalc { |
| private static final int PERCENTAGE = 100; |
| |
| private static final CPUMonitorCalc instance = new CPUMonitorCalc(); |
| |
| private final OperatingSystemMXBean osMxBean; |
| |
| private final ThreadMXBean threadMXBean; |
| |
| private long preTime = System.nanoTime(); |
| |
| private long preUsedTime = 0; |
| |
| private CPUMonitorCalc() { |
| osMxBean = ManagementFactory.getOperatingSystemMXBean(); |
| threadMXBean = ManagementFactory.getThreadMXBean(); |
| } |
| |
| public static CPUMonitorCalc getInstance() { |
| return instance; |
| } |
| |
| public double getProcessCpu() { |
| long totalTime = 0; |
| |
| for (long id : threadMXBean.getAllThreadIds()) { |
| totalTime += threadMXBean.getThreadCpuTime(id); |
| } |
| |
| long curtime = System.nanoTime(); |
| long usedTime = totalTime - preUsedTime; |
| long totalPassedTime = curtime - preTime; |
| preTime = curtime; |
| preUsedTime = totalTime; |
| return (((double) usedTime) / totalPassedTime / osMxBean.getAvailableProcessors()) * PERCENTAGE; |
| } |
| } |