Packages

trait Observer[T] extends Subscriber[T]

A Scala based wrapper of the Subscriber interface which provides a mechanism for receiving push-based notifications.

Will receive a call to Observer.onSubscribe(subscription: Subscription) on subscription to the Observable.

Default implementations of this trait are greedy and will call Subscription.request with Long.MaxValue so that all results are requested. Custom implementations of the onSubscribe method can be used to control "back-pressure" and ensure that only demand that the Observer is capable of handling is requested.

After signaling demand:

- One or more invocations of Observer.onNext up to the maximum number defined by Subscription.request - Single invocation of Observer.onError or Observer.onComplete which signals a terminal state after which no further events will be sent.

T

The type of element signaled.

Linear Supertypes
Subscriber[T], AnyRef, Any
Known Subclasses
BoxedSubscriber
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  1. Observer
  2. Subscriber
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Visibility
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  2. Protected

Abstract Value Members

  1. abstract def onComplete(): Unit

    Notifies the Subscriber that the Observable has finished sending push-based notifications.

    Notifies the Subscriber that the Observable has finished sending push-based notifications.

    The Observable will not call this method if it calls onError.

    Definition Classes
    Observer → Subscriber
  2. abstract def onError(e: Throwable): Unit

    Notifies the Observer that the Observable has experienced an error condition.

    Notifies the Observer that the Observable has experienced an error condition.

    If the Observable calls this method, it will not thereafter call onNext or onComplete.

    e

    the exception encountered by the Observable

    Definition Classes
    Observer → Subscriber
  3. abstract def onNext(result: T): Unit

    Provides the Observer with a new item to observe.

    Provides the Observer with a new item to observe.

    The Observer may call this method 0 or more times.

    The Observable will not call this method again after it calls either onComplete or onError.

    result

    the item emitted by the Observable

    Definition Classes
    Observer → Subscriber

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native() @HotSpotIntrinsicCandidate()
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  7. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  8. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  9. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  10. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  11. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  12. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  13. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  14. def onSubscribe(subscription: reactivestreams.Subscription): Unit

    Handles the automatic boxing of a Java subscription so it conforms to the interface.

    Handles the automatic boxing of a Java subscription so it conforms to the interface.

    subscription

    the Java subscription

    Definition Classes
    Observer → Subscriber
    Note

    Users should not have to implement this method but rather use the Scala Subscription.

  15. def onSubscribe(subscription: Subscription): Unit

    Invoked on subscription to an Observable.

    Invoked on subscription to an Observable.

    No operation will happen until Subscription.request is invoked.

    It is the responsibility of this Subscriber instance to call Subscription.request whenever more data is wanted.

    subscription

    Subscription that allows requesting data via Subscription.request

  16. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  17. def toString(): String
    Definition Classes
    AnyRef → Any
  18. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  19. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  20. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated @deprecated
    Deprecated

    (Since version ) see corresponding Javadoc for more information.

Inherited from Subscriber[T]

Inherited from AnyRef

Inherited from Any

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