uima-ducc-agent/src/main/java/org/apache/uima/ducc/agent/metrics/collectors/NodeCpuCollector.java

/*
 * 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.uima.ducc.agent.metrics.collectors;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.util.concurrent.Callable;

import org.apache.uima.ducc.common.node.metrics.NodeCpuInfo;



public class NodeCpuCollector implements Callable<NodeCpuInfo> {

  public NodeCpuInfo call() throws Exception {
    OperatingSystemMXBean osBean = ManagementFactory.getOperatingSystemMXBean();
    return new NodeCpuInfo(osBean.getAvailableProcessors(), String.valueOf(getCPULoad()));
  }
	private double getCPULoad() throws Exception {
		double cpu = 0.0;
		InputStreamReader in = null;
		String[] command = {
				"/bin/sh",
				"-c",
				"/bin/grep 'cpu' /proc/stat | /bin/awk '{usage=($2+$4)*100/($2+$4+$5)} END {print usage}'" };
		try {
			ProcessBuilder pb = new ProcessBuilder();
			pb.command(command);

			pb.redirectErrorStream(true);
			Process swapCollectorProcess = pb.start();
			in = new InputStreamReader(swapCollectorProcess.getInputStream());
			BufferedReader reader = new BufferedReader(in);
			String line = null;
			while ((line = reader.readLine()) != null) {
				System.out.println(line);
				try {
					cpu = Double.parseDouble(line.trim());
				} catch (NumberFormatException e) {
					cpu = 0;
					e.printStackTrace();
				}
			}
		} catch (Exception e) {
			throw e;
		} finally {
			if (in != null) {
				try {
					in.close();
				} catch (Exception e) {
				}

			}
		}

		return cpu;
	}
}