/**
* Create a new single producer RingBuffer with the specified wait strategy.
*
* @param factory used to create the events within the ring buffer.
* @param bufferSize number of elements to create within the ring buffer.
* @param waitStrategy used to determine how to wait for new elements to become available.
* @param spinObserver called each time the next claim is spinning and waiting for a slot
* @see SingleProducerSequencer
*/
public static <E> RingBuffer<E> createSingleProducer(
Supplier<E> factory, int bufferSize, WaitStrategy waitStrategy, Consumer<Void> spinObserver) {
SingleProducerSequencer sequencer =
new SingleProducerSequencer(bufferSize, waitStrategy, spinObserver);
if (PlatformDependent.hasUnsafe() && Util.isPowerOfTwo(bufferSize)) {
return new UnsafeRingBuffer<>(factory, sequencer);
} else {
return new NotFunRingBuffer<>(factory, sequencer);
}
}
/**
* @author Stephane Maldini
* @since 2.1
*/
public class InterruptableSubscriber<T> extends ConsumerSubscriber<T> implements Control {
@SuppressWarnings("unused")
volatile Subscription subscription;
static final AtomicReferenceFieldUpdater<InterruptableSubscriber, Subscription> SUBSCRIPTION =
PlatformDependent.newAtomicReferenceFieldUpdater(
InterruptableSubscriber.class, "subscription");
static final Subscription CANCELLED =
new Subscription() {
@Override
public void request(long n) {}
@Override
public void cancel() {}
};
static final Subscription UNSUBSCRIBED =
new Subscription() {
@Override
public void request(long n) {}
@Override
public void cancel() {}
};
public InterruptableSubscriber(
Consumer<? super T> consumer,
Consumer<? super Throwable> errorConsumer,
Consumer<Void> completeConsumer) {
super(consumer, errorConsumer, completeConsumer);
SUBSCRIPTION.lazySet(this, UNSUBSCRIBED);
}
@Override
public void cancel() {
if (SUBSCRIPTION.getAndSet(this, CANCELLED) != CANCELLED) {
super.cancel();
}
}
@Override
protected final void doNext(T x) {
if (subscription == CANCELLED) {
throw CancelException.get();
}
super.doNext(x);
doPostNext(x);
}
@Override
protected final void doSubscribe(Subscription s) {
if (SUBSCRIPTION.getAndSet(this, s) != CANCELLED) {
doSafeSubscribe(s);
}
}
@Override
protected final void doError(Throwable t) {
if (SUBSCRIPTION.getAndSet(this, CANCELLED) != CANCELLED) {
doSafeError(t);
}
}
@Override
protected final void doComplete() {
if (SUBSCRIPTION.getAndSet(this, CANCELLED) != CANCELLED) {
doSafeComplete();
}
}
@Override
protected void requestMore(long n) {
Subscription subscription = SUBSCRIPTION.get(this);
if (subscription != UNSUBSCRIBED) {
subscription.request(n);
}
}
protected void doSafeSubscribe(Subscription s) {
super.doSubscribe(s);
}
protected void doPostNext(T x) {}
protected void doSafeComplete() {
super.doComplete();
}
protected void doSafeError(Throwable t) {
super.doError(t);
}
@Override
public boolean isTerminated() {
return SUBSCRIPTION.get(this) == CANCELLED;
}
@Override
public ReactiveStateUtils.Graph debug() {
return ReactiveStateUtils.scan(this);
}
protected boolean isUnsubscribed() {
return SUBSCRIPTION.get(this) == UNSUBSCRIBED;
}
}
/**
* A Global Timer
*
* @author Stephane Maldini
* @since 2.5
*/
public class GlobalTimer extends HashWheelTimer implements ReactiveState.Trace {
private static final class GlobalContext {
volatile GlobalTimer timer;
}
private static final AtomicReferenceFieldUpdater<GlobalContext, GlobalTimer> GLOBAL_TIMER =
PlatformDependent.newAtomicReferenceFieldUpdater(GlobalContext.class, "timer");
private static final GlobalContext context = new GlobalContext();
public GlobalTimer() {
super("global-timer", 50, DEFAULT_WHEEL_SIZE, new WaitStrategy.Sleeping(), null);
}
private void _cancel() {
super.cancel();
// TimeUtils.disable();
}
@Override
public void cancel() {
// IGNORE
}
@Override
public void start() {
// TimeUtils.enable();
super.start();
}
/**
* Obtain the default global timer from the current context. The globalTimer is created lazily so
* it is preferrable to fetch them out of the critical path.
*
* <p>The global timer will also ignore {@link Timer#cancel()} calls and should be cleaned using
* {@link #unregister()} ()}.
*
* <p>The default globalTimer is a {@link HashWheelTimer}. It is suitable for non blocking
* periodic work such as eventing, memory access, lock-free code, dispatching...
*
* @return the globalTimer, usually a {@link HashWheelTimer}
*/
public static Timer get() {
GlobalTimer t = context.timer;
while (null == t) {
t = new GlobalTimer();
if (!GLOBAL_TIMER.compareAndSet(context, null, t)) {
t = context.timer;
t._cancel();
} else {
t.start();
break;
}
}
return t;
}
/**
* Clean current global timer references and cancel the respective {@link Timer}. A new global
* timer can be assigned later with {@link #get()}.
*/
public static void unregister() {
GlobalTimer timer;
while ((timer = GLOBAL_TIMER.getAndSet(context, null)) != null) {
timer._cancel();
}
}
/**
* Read if the context timer has been set
*
* @return true if context timer is initialized
*/
public static boolean available() {
return context.timer != null;
}
/**
* The returned timer SHOULD always be cancelled after use, however global timer will ignore it.
*
* @return eventually the global timer or if not set a fresh timer.
*/
public static Timer globalOrNew() {
Timer timer = context.timer;
if (timer == null) {
timer = new HashWheelTimer(50, 64, new WaitStrategy.Sleeping());
timer.start();
}
return timer;
}
}
