javax.ws.rs.sse.SseSubscription Maven / Gradle / Ivy
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package javax.ws.rs.sse;
/**
* Server-sent event subscription representation, which links
* {@link SseEventSource} and its subscribers.
*
* The methods in this interface are intended to be invoked only by their
* Subscribers; usages in other contexts have undefined effects.
*/
public interface SseSubscription {
/**
* Adds the given number {@code n} of items to the current
* unfulfilled demand for this subscription. If {@code n} is
* negative, the Subscriber will receive an {@code onError}
* signal with an {@link IllegalArgumentException} argument.
* Otherwise, the Subscriber will receive up to {@code n}
* additional {@code onNext} invocations (or fewer if
* terminated).
*
* @param n the increment of demand; a value of {@code
* Long.MAX_VALUE} may be considered as effectively unbounded
*/
public void request(long n);
/**
* Causes the Subscriber to (eventually) stop receiving
* messages. Implementation is best-effort -- additional
* messages may be received after invoking this method.
* A cancelled subscription need not ever receive an
* {@code onComplete} or {@code onError} signal.
*/
public void cancel();
}