public interface Subscription
Subscription represents a one-to-one lifecycle of a Subscriber subscribing to a Publisher.
It can only be used once by a single Subscriber.
It is used to both signal desire for data and cancel demand (and allow resource cleanup).
| Modifier and Type | Method | Description |
|---|---|---|
void |
cancel() |
Request the
Publisher to stop sending data and clean up resources. |
void |
request(long n) |
No events will be sent by a
Publisher until demand is signaled via this method. |
void request(long n)
Publisher until demand is signaled via this method.
It can be called however often and whenever needed—but the outstanding cumulative demand must never exceed Long.MAX_VALUE.
An outstanding cumulative demand of Long.MAX_VALUE may be treated by the Publisher as "effectively unbounded".
Whatever has been requested can be sent by the Publisher so only signal demand for what can be safely handled.
A Publisher can send less than is requested if the stream ends but
then must emit either Subscriber.onError(Throwable) or Subscriber.onComplete().
n - the strictly positive number of elements to requests to the upstream Publisher