public void instantiateYammerMetrics(Class klass, String scope, ObjectName nameObj) {
    String name = MetricRegistry.name(klass);
    if (scope != null) {
        name = MetricRegistry.name(name, scope);
    }
    MetricRegistry reg = Metrics.getRegistry();
    hitCount = reg.register(MetricRegistry.name(name, "Hit Count"),
            new JmxAttributeGauge(nameObj, "HitCount"));
    hitRate = reg.register(MetricRegistry.name(name, "Hit Rate"),
            new JmxAttributeGauge(nameObj, "HitRate"));
    loadCount = reg.register(MetricRegistry.name(name, "Load Count"),
            new JmxAttributeGauge(nameObj, "LoadCount"));
    missRate = reg.register(MetricRegistry.name(name, "Miss Rate"),
            new JmxAttributeGauge(nameObj, "MissRate"));
    requestCount = reg.register(MetricRegistry.name(name, "Request Count"),
            new JmxAttributeGauge(nameObj, "RequestCount"));
    totalLoadTime = reg.register(MetricRegistry.name(name, "Total Load Time"),
            new JmxAttributeGauge(nameObj, "TotalLoadTime"));
}
 

public JmxAttributeGauge jmx(ObjectName object, String attribute) {
   return new JmxAttributeGauge(object, attribute);
}
 

public JmxAttributeGauge jmx(String object, String attribute) throws MalformedObjectNameException {
   return jmx(new ObjectName(object), attribute);
}
 

public JmxAttributeGauge jmx(String name, ObjectName object, String attribute) {
   return register(name, jmx(object, attribute));
}
 

public JmxAttributeGauge jmx(String name, String object, String attribute) throws MalformedObjectNameException {
   return register(name, jmx(object, attribute));
}
 

/**
 * Registers the different ZooKeeper metrics.
 */
private void registerMetrics(final ObjectName nameObj, MetricRegistry reg) {
    reg.register(MetricRegistry.name(ZKShardLockManager.class, "Lock Disinterested Time Millis"),
            new JmxAttributeGauge(nameObj, "LockDisinterestedTimeMillis"));
    reg.register(MetricRegistry.name(ZKShardLockManager.class, "Min Lock Hold Time Millis"),
            new JmxAttributeGauge(nameObj, "MinLockHoldTimeMillis"));
    reg.register(MetricRegistry.name(ZKShardLockManager.class, "Seconds Since Last Scavenge"),
            new JmxAttributeGauge(nameObj, "SecondsSinceLastScavenge"));

    reg.register(MetricRegistry.name(ZKShardLockManager.class, "Zk Connection Status"),
            new JmxAttributeGauge(nameObj, "ZkConnectionStatus") {
                @Override
                public Object getValue() {
                    Object val = super.getValue();
                    if (val.equals("connected")) {
                        return 1;
                    }
                    return 0;
                }
            });
    reg.register(MetricRegistry.name(ZKShardLockManager.class, "Held Shards"),
            new Gauge<Integer>() {
                @Override
                public Integer getValue() {
                    return getHeldShards().size();
                }
            });

    reg.register(MetricRegistry.name(ZKShardLockManager.class, "Unheld Shards"),
            new Gauge<Integer>() {
                @Override
                public Integer getValue() {
                    return getUnheldShards().size();
                }
            });
    reg.register(MetricRegistry.name(ZKShardLockManager.class, "Error Shards"),
            new Gauge<Integer>() {
                @Override
                public Integer getValue() {
                    return getErrorShards().size();
                }
            });
}