type Controller struct {
	monitor     Monitor
	configStore model.ConfigStore
	hasSynced   func() bool

	// If meshConfig.DiscoverySelectors are specified, the namespacesFilter tracks the namespaces this controller watches.
	namespacesFilter func(obj interface{}) bool
}

// NewController return an implementation of ConfigStoreController
// This is a client-side monitor that dispatches events as the changes are being

    if (e == null) throw new NullPointerException();
    final Monitor monitor = this.monitor;
    monitor.enterWhen(notFull);
    try {
      insert(e);
    } finally {
      monitor.leave();
    }
  }

  @CanIgnoreReturnValue
  @Override
  public @Nullable E poll() {
    final Monitor monitor = this.monitor;
    if (monitor.enterIf(notEmpty)) {
      try {
        return extract();

        return "stopping({from = " + from + "})";
      }
    };
  }

  private final Monitor monitor = new Monitor();

  private final Guard isStartable = new IsStartableGuard();

  @WeakOuter
  private final class IsStartableGuard extends Guard {
    IsStartableGuard() {
      super(AbstractService.this.monitor);
    }

    @Override
    public boolean isSatisfied() {
      return state() == NEW;

			logger.Info("QuotaMonitor created object count evaluator", "resource", resource.GroupResource())
		}

		// track the monitor
		current[resource] = &monitor{controller: c}
		added++
	}
	qm.monitors = current

	for _, monitor := range toRemove {
		if monitor.stopCh != nil {
			close(monitor.stopCh)
		}
	}

	logger.V(4).Info("quota synced monitors", "added", added, "kept", kept, "removed", len(toRemove))

    Monitor monitor1 = new Monitor();
    Monitor monitor2 = new Monitor();
    FlagGuard guard = new FlagGuard(monitor2);
    assertThrows(IllegalMonitorStateException.class, () -> monitor1.getWaitQueueLength(guard));
  }

  public void testHasWaitersWithWrongMonitorThrowsIMSE() {
    Monitor monitor1 = new Monitor();
    Monitor monitor2 = new Monitor();
    FlagGuard guard = new FlagGuard(monitor2);

    Monitor monitor1 = new Monitor();
    Monitor monitor2 = new Monitor();
    FlagGuard guard = new FlagGuard(monitor2);
    assertThrows(IllegalMonitorStateException.class, () -> monitor1.getWaitQueueLength(guard));
  }

  public void testHasWaitersWithWrongMonitorThrowsIMSE() {
    Monitor monitor1 = new Monitor();
    Monitor monitor2 = new Monitor();
    FlagGuard guard = new FlagGuard(monitor2);

        given:
        def monitor = new DefaultGarbageCollectionMonitor(GarbageCollectorMonitoringStrategy.UNKNOWN, scheduledExecutorService)

        when:
        monitor.getHeapStats()

        then:
        noExceptionThrown()
    }

    def "non-heap stats defaults to empty given unknown garbage collector"() {
        given:

      @Override
      protected void runTest() throws Throwable {
        Monitor monitor = new Monitor(fair);
        FlagGuard guard = new FlagGuard(monitor);
        Object[] arguments =
            (timed ? new Object[] {guard, 0L, TimeUnit.MILLISECONDS} : new Object[] {guard});
        try {
          method.invoke(monitor, arguments);
          fail("expected IllegalMonitorStateException");

    if (e == null) throw new NullPointerException();
    final Monitor monitor = this.monitor;
    monitor.enterWhen(notFull);
    try {
      insert(e);
    } finally {
      monitor.leave();
    }
  }

  @CanIgnoreReturnValue
  @Override
  public @Nullable E poll() {
    final Monitor monitor = this.monitor;
    if (monitor.enterIf(notEmpty)) {
      try {
        return extract();

	cp etcd-version-monitor.go Dockerfile $(TEMP_DIR)

	# Compile etcd-version-monitor.
	docker run --rm -it \
	    -v $(shell pwd)/../../../:/go/src/k8s.io/kubernetes \
	    -v $(TEMP_DIR):/build \
	    -e GOARCH=$(ARCH) \
	    golang:$(GOLANG_VERSION) \
	    /bin/bash -c "CGO_ENABLED=0 go build -o /build/etcd-version-monitor k8s.io/kubernetes/cluster/images/etcd-version-monitor"

	docker build -t $(IMAGE) $(TEMP_DIR)