Added in API level 30

Flow.Subscriber

public static interface Flow.Subscriber

java.util.concurrent.Flow.Subscriber<T>


A receiver of messages. The methods in this interface are invoked in strict sequential order for each Subscription.

Summary

Public methods

abstract void onComplete()

Method invoked when it is known that no additional Subscriber method invocations will occur for a Subscription that is not already terminated by error, after which no other Subscriber methods are invoked by the Subscription.

abstract void onError(Throwable throwable)

Method invoked upon an unrecoverable error encountered by a Publisher or Subscription, after which no other Subscriber methods are invoked by the Subscription.

abstract void onNext(T item)

Method invoked with a Subscription's next item.

abstract void onSubscribe(Flow.Subscription subscription)

Method invoked prior to invoking any other Subscriber methods for the given Subscription.

Public methods

onComplete

Added in API level 30
public abstract void onComplete ()

Method invoked when it is known that no additional Subscriber method invocations will occur for a Subscription that is not already terminated by error, after which no other Subscriber methods are invoked by the Subscription. If this method throws an exception, resulting behavior is undefined.

onError

Added in API level 30
public abstract void onError (Throwable throwable)

Method invoked upon an unrecoverable error encountered by a Publisher or Subscription, after which no other Subscriber methods are invoked by the Subscription. If this method itself throws an exception, resulting behavior is undefined.

Parameters
throwable Throwable: the exception

onNext

Added in API level 30
public abstract void onNext (T item)

Method invoked with a Subscription's next item. If this method throws an exception, resulting behavior is not guaranteed, but may cause the Subscription to be cancelled.

Parameters
item T: the item

onSubscribe

Added in API level 30
public abstract void onSubscribe (Flow.Subscription subscription)

Method invoked prior to invoking any other Subscriber methods for the given Subscription. If this method throws an exception, resulting behavior is not guaranteed, but may cause the Subscription not to be established or to be cancelled.

Typically, implementations of this method invoke subscription.request to enable receiving items.

Parameters
subscription Flow.Subscription: a new subscription