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package sun.tools.jstat;

import java.util.*;
import sun.jvmstat.monitor.*;
import sun.jvmstat.monitor.event.*;

Application to output jvmstat statistics exported by a target Java Virtual Machine. The jstat tool gets its inspiration from the suite of 'stat' tools, such as vmstat, iostat, mpstat, etc., available in various UNIX platforms.
Author:Brian Doherty
Since:1.5
/** * Application to output jvmstat statistics exported by a target Java * Virtual Machine. The jstat tool gets its inspiration from the suite * of 'stat' tools, such as vmstat, iostat, mpstat, etc., available in * various UNIX platforms. * * @author Brian Doherty * @since 1.5 */
public class Jstat { private static Arguments arguments; public static void main(String[] args) { try { arguments = new Arguments(args); } catch (IllegalArgumentException e) { System.err.println(e.getMessage()); Arguments.printUsage(System.err); System.exit(1); } if (arguments.isHelp()) { Arguments.printUsage(System.out); System.exit(0); } if (arguments.isOptions()) { OptionLister ol = new OptionLister(arguments.optionsSources()); ol.print(System.out); System.exit(0); } try { if (arguments.isList()) { logNames(); } else if (arguments.isSnap()) { logSnapShot(); } else { logSamples(); } } catch (MonitorException e) { e.printStackTrace(); System.exit(1); } System.exit(0); } static void logNames() throws MonitorException { VmIdentifier vmId = arguments.vmId(); int interval = arguments.sampleInterval(); MonitoredHost monitoredHost = MonitoredHost.getMonitoredHost(vmId); MonitoredVm monitoredVm = monitoredHost.getMonitoredVm(vmId, interval); JStatLogger logger = new JStatLogger(monitoredVm); logger.printNames(arguments.counterNames(), arguments.comparator(), arguments.showUnsupported(), System.out); monitoredHost.detach(monitoredVm); } static void logSnapShot() throws MonitorException { VmIdentifier vmId = arguments.vmId(); int interval = arguments.sampleInterval(); MonitoredHost monitoredHost = MonitoredHost.getMonitoredHost(vmId); MonitoredVm monitoredVm = monitoredHost.getMonitoredVm(vmId, interval); JStatLogger logger = new JStatLogger(monitoredVm); logger.printSnapShot(arguments.counterNames(), arguments.comparator(), arguments.isVerbose(), arguments.showUnsupported(), System.out); monitoredHost.detach(monitoredVm); } static void logSamples() throws MonitorException { final VmIdentifier vmId = arguments.vmId(); int interval = arguments.sampleInterval(); final MonitoredHost monitoredHost = MonitoredHost.getMonitoredHost(vmId); MonitoredVm monitoredVm = monitoredHost.getMonitoredVm(vmId, interval); final JStatLogger logger = new JStatLogger(monitoredVm); OutputFormatter formatter = null; if (arguments.isSpecialOption()) { OptionFormat format = arguments.optionFormat(); formatter = new OptionOutputFormatter(monitoredVm, format); } else { List<Monitor> logged = monitoredVm.findByPattern(arguments.counterNames()); Collections.sort(logged, arguments.comparator()); List<Monitor> constants = new ArrayList<Monitor>(); for (Iterator<Monitor> i = logged.iterator(); i.hasNext(); /* empty */) { Monitor m = i.next(); if (!(m.isSupported() || arguments.showUnsupported())) { i.remove(); continue; } if (m.getVariability() == Variability.CONSTANT) { i.remove(); if (arguments.printConstants()) constants.add(m); } else if ((m.getUnits() == Units.STRING) && !arguments.printStrings()) { i.remove(); } } if (!constants.isEmpty()) { logger.printList(constants, arguments.isVerbose(), arguments.showUnsupported(), System.out); if (!logged.isEmpty()) { System.out.println(); } } if (logged.isEmpty()) { monitoredHost.detach(monitoredVm); return; } formatter = new RawOutputFormatter(logged, arguments.printStrings()); } // handle user termination requests by stopping sampling loops Runtime.getRuntime().addShutdownHook(new Thread() { public void run() { logger.stopLogging(); } }); // handle target termination events for targets other than ourself HostListener terminator = new HostListener() { public void vmStatusChanged(VmStatusChangeEvent ev) { Integer lvmid = vmId.getLocalVmId(); if (ev.getTerminated().contains(lvmid)) { logger.stopLogging(); } else if (!ev.getActive().contains(lvmid)) { logger.stopLogging(); } } public void disconnected(HostEvent ev) { if (monitoredHost == ev.getMonitoredHost()) { logger.stopLogging(); } } }; if (vmId.getLocalVmId() != 0) { monitoredHost.addHostListener(terminator); } logger.logSamples(formatter, arguments.headerRate(), arguments.sampleInterval(), arguments.sampleCount(), System.out); // detach from host events and from the monitored target jvm if (terminator != null) { monitoredHost.removeHostListener(terminator); } monitoredHost.detach(monitoredVm); } }