Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package org.hyperic.hq.plugin.system; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.HashMap; import java.util.Map; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hyperic.hq.product.Collector; /** * * @author glaullon */ public class OtherUnixCollector extends Collector { private static final Log log = LogFactory.getLog(OtherUnixCollector.class); private static final String VMSTAT[] = { "vmstat", "-s" }; private static final String METRICS[][] = { { "pgfault", "minor (as) faults" }, { "pgmajfault", "major faults" }, // Solaris { "pgfault", "total address trans. faults" }, { "pgmajfault", "executable filled pages faults" }, // AIX { "pgfault", "total address trans. faults taken" }, { "pgmajfault", "executable fill page faults" }, // HPUX }; @Override public void collect() { log.info("[collect]"); Process cmd; try { cmd = Runtime.getRuntime().exec(VMSTAT); cmd.waitFor(); if (cmd.exitValue() != 0) { String msg = inputStreamAsString(cmd.getErrorStream()); log.info("[collect] cmd error: " + msg); setErrorMessage(msg); } else { Map<String, Double> stats = parseVMStat(cmd.getInputStream()); for (String[] metric : METRICS) { final Double val = stats.get(metric[1]); log.info("[collect] " + metric[0] + "=" + val); if (val != null) { setValue(metric[0], val); } } } } catch (IOException e) { log.info("[collect] error: " + e.getMessage(), e); setErrorMessage(e.getLocalizedMessage(), e); } catch (InterruptedException e) { log.info("[collect] error: " + e.getMessage(), e); setErrorMessage(e.getLocalizedMessage(), e); } } static final Map<String, Double> parseVMStat(InputStream stream) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(stream)); Map<String, Double> res = new HashMap<String, Double>(); try { String line; while ((line = br.readLine()) != null) { line = line.trim(); int sep = line.indexOf(" "); log.info("[parseVMStat] line='" + line + "' (" + sep + ")"); if (sep > 0) { String key = line.substring(sep).trim(); String val = line.substring(0, sep).trim(); log.info("[parseVMStat] " + key + " = " + val); res.put(key, Double.parseDouble(val)); } } } finally { br.close(); } return res; } static final String inputStreamAsString(InputStream stream) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(stream)); StringBuilder sb = new StringBuilder(); try { String line; while ((line = br.readLine()) != null) { sb.append(line).append("\n"); } } finally { br.close(); } return sb.toString(); } }