| /** |
| * 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.activemq.tool.sampler.plugins; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.util.StringTokenizer; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| public class LinuxCpuSamplerPlugin implements CpuSamplerPlugin, Runnable { |
| |
| private Process vmstatProcess; |
| private String vmstat; |
| private String result = ""; |
| private final Object mutex = new Object(); |
| private AtomicBoolean stop = new AtomicBoolean(false); |
| |
| public LinuxCpuSamplerPlugin(long intervalInMs) { |
| vmstat = "vmstat -n " + (int)(intervalInMs / 1000); |
| } |
| |
| public void start() { |
| stop.set(false); |
| Thread t = new Thread(this); |
| t.start(); |
| } |
| |
| public void stop() { |
| stop.set(true); |
| try { |
| vmstatProcess.waitFor(); |
| } catch (InterruptedException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| public void run() { |
| |
| try { |
| vmstatProcess = Runtime.getRuntime().exec(vmstat); |
| BufferedReader br = new BufferedReader(new InputStreamReader(vmstatProcess.getInputStream()), 1024); |
| |
| br.readLine(); // throw away the first line |
| |
| String header = br.readLine(); |
| String data; |
| |
| while (!stop.get()) { |
| data = br.readLine(); |
| if (data != null) { |
| String csvData = convertToCSV(header, data); |
| synchronized (mutex) { |
| result = csvData; |
| } |
| } |
| } |
| br.close(); |
| vmstatProcess.destroy(); |
| |
| } catch (IOException ioe) { |
| ioe.printStackTrace(); |
| } |
| } |
| |
| public String getCpuUtilizationStats() { |
| String data; |
| synchronized (mutex) { |
| data = result; |
| result = ""; |
| } |
| return data; |
| } |
| |
| public String getVmstat() { |
| return vmstat; |
| } |
| |
| public void setVmstat(String vmstat) { |
| this.vmstat = vmstat; |
| } |
| |
| protected String convertToCSV(String header, String data) { |
| StringTokenizer headerTokens = new StringTokenizer(header, " "); |
| StringTokenizer dataTokens = new StringTokenizer(data, " "); |
| |
| String csv = ""; |
| while (headerTokens.hasMoreTokens()) { |
| csv += headerTokens.nextToken() + "=" + dataTokens.nextToken() + ","; |
| } |
| |
| return csv; |
| } |
| } |