List JVM monitoring metrics

ListJvmMonitorMetrics.java

package org.neverfear.services.jvmmonitor.api;

import static java.lang.System.out;

import java.net.URISyntaxException;
import java.util.List;
import java.util.Set;

import sun.jvmstat.monitor.HostIdentifier;
import sun.jvmstat.monitor.Monitor;
import sun.jvmstat.monitor.MonitorException;
import sun.jvmstat.monitor.MonitoredHost;
import sun.jvmstat.monitor.MonitoredVm;
import sun.jvmstat.monitor.VmIdentifier;

public class ListJvmMonitorMetrics {
    public static VmIdentifier createVmId(final Integer id) {
        try {
            return new VmIdentifier(id.toString());
        } catch (final URISyntaxException e) {
            // Shoudn't happen
            throw new AssertionError(e);
        }
    }

    private static final HostIdentifier LOCALHOST_IDENTIFIER = createHostId(null);

    private static void logListOfUnmatchingMonitors(final MonitoredVm vm)
            throws MonitorException {
        final List<Monitor> allMonitors = vm.findByPattern(".*");
        for (final Monitor monitor : allMonitors) {
            final Object value = monitor.getValue();
            out.format("monitor: %s %s %s (%s)=%s%n",
                    monitor.getName(),
                    monitor.getVariability(),
                    monitor.getUnits(),
                    value != null ? value.getClass().getSimpleName() : null,
                    value);
        }
    }

    private static HostIdentifier createHostId(final String str) {
        try {
            return new HostIdentifier(str);
        } catch (final URISyntaxException e) {
            throw new IllegalArgumentException(e);
        }
    }

    public static void main(String[] args) throws Exception {
        final MonitoredHost monitoredHost = MonitoredHost.getMonitoredHost(LOCALHOST_IDENTIFIER);
        MonitoredHost host = monitoredHost;
        final Set<Integer> activeVms = host.activeVms();
        for (final Integer vmId : activeVms) {
            out.println("VM ID: " + vmId);
            final MonitoredVm monitoredVm = host.getMonitoredVm(createVmId(vmId));
            logListOfUnmatchingMonitors(monitoredVm);
            out.println();
            out.println();
        }

    }
}