import org.gradle.internal.service.scopes.Scope;
import org.gradle.internal.service.scopes.ServiceScope;

/**
 * A device for obtaining the current time.
 *
 * @see Time#clock()
 */
@ServiceScope(Scope.Global.class)
public interface Clock {

    /**
     * The current time in millis.
     */
    long getCurrentTime();

	}
}

// TryLock tries to lock rw for writing and reports whether it succeeded.
//
// Note that while correct uses of TryLock do exist, they are rare,
// and use of TryLock is often a sign of a deeper problem
// in a particular use of mutexes.
func (rw *RWMutex) TryLock() bool {
	if race.Enabled {
		_ = rw.w.state
		race.Disable()
	}
	if !rw.w.TryLock() {
		if race.Enabled {
			race.Enable()

		w.setBookmarkAfterResourceVersion(0)
		return w
	}

	clock := testingclock.NewFakeClock(time.Now())
	watchers := newTimeBucketWatchers(clock, defaultBookmarkFrequency)
	now := clock.Now()
	watchers.addWatcherThreadUnsafe(newWatcher(now.Add(10 * time.Second)))
	watchers.addWatcherThreadUnsafe(newWatcher(now.Add(20 * time.Second)))

	groupResource schema.GroupResource,
	clock clock.Clock,
	maxIdleTime time.Duration,
	stopCh <-chan struct{}) Store {

	if maxIdleTime < minIdleTime {
		maxIdleTime = minIdleTime
	}

	store := &objectCache{
		listObject:    listObject,
		watchObject:   watchObject,
		newObject:     newObject,
		isImmutable:   isImmutable,
		groupResource: groupResource,
		clock:         clock,
		maxIdleTime:   maxIdleTime,

	// This handler is run at the end of every Add/Update/Delete method
	// and additionally gets the previous value of the object.
	eventHandler func(*watchCacheEvent)

	// for testing timeouts.
	clock clock.Clock

	// An underlying storage.Versioner.
	versioner storage.Versioner

	// cacher's group resource
	groupResource schema.GroupResource

	// For testing cache interval invalidation.

		l.bucket.fill -= uint64(-change)
	}
	if change != 0 && enabled {
		l.enabled.Store(false)
	}
}

// tryLock attempts to lock l. Returns true on success.
func (l *gcCPULimiterState) tryLock() bool {
	return l.lock.CompareAndSwap(0, 1)
}

// unlock releases the lock on l. Must be called if tryLock returns true.
func (l *gcCPULimiterState) unlock() {
	old := l.lock.Swap(0)
	if old != 1 {
		throw("double unlock")

            @Override
            ResourceLockState.Disposition transform(ResourceLockState workerLeaseState) {
                if (lock1.tryLock() && lock2.tryLock()) {
                    return FINISHED
                } else {
                    return FAILED
                }
            }
        })

        then:

		description string
		funcGen     func(cache *claimInfoCache) func() error
		wantErr     bool
	}{
		{
			description: "RLock-ed cache allows another RLock",
			funcGen: func(cache *claimInfoCache) func() error {
				return func() error {
					if !cache.RWMutex.TryRLock() {
						return errors.New("RLock failed")
					}
					return nil
				}
			},
		},
		{
			description: "cache is locked inside a function",

	startBucketID     int64
	clock             clock.Clock
	bookmarkFrequency time.Duration
}

func newTimeBucketWatchers(clock clock.Clock, bookmarkFrequency time.Duration) *watcherBookmarkTimeBuckets {
	return &watcherBookmarkTimeBuckets{
		watchersBuckets:   make(map[int64][]*cacheWatcher),
		createTime:        clock.Now(),
		startBucketID:     0,
		clock:             clock,
		bookmarkFrequency: bookmarkFrequency,

}

// Option configures a PriorityQueue
type Option func(*priorityQueueOptions)

// WithClock sets clock for PriorityQueue, the default clock is clock.RealClock.
func WithClock(clock clock.Clock) Option {
	return func(o *priorityQueueOptions) {
		o.clock = clock
	}
}

// WithPodInitialBackoffDuration sets pod initial backoff duration for PriorityQueue.