object EventSource
This stream processing stage establishes a continuous source of server-sent events from the given URI.
A single source of server-sent events is obtained from the URI. Once completed, either normally or by failure, a next one is obtained thereby sending a Last-Evend-ID header if available. This continues in an endless cycle.
The shape of this processing stage is a source of server-sent events; to take effect it must be connected and run. Progress (including termination) is controlled by the connected flow or sink, e.g. a retry delay can be implemented by streaming the materialized values of the handler via a throttle.
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +---------------------+ | | trigger | | +----------o----------+ | | | Option[String]| | v | Option[String] +----------o----------+ | +------------------------------->o merge | | | +----------o----------+ | | | | | Option[String]| | | v | +----------o----------+ +----------o----------+ | | currentLastEventId | | eventSources | | +----------o----------+ +----------o----------+ | ^ | | | (EventSource, Future[Option[String]])| | | v | | +----------o----------+ | +--------------------------------o unzip | | Future[Option[String]] +----------o----------+ | | | EventSource| | v | +----------o----------+ | +----------o flatten | | ServerSentEvent| +---------------------+ | v | - - - - - - - - - - - - - - - - - o - - - - - - - - - - - - - - - - -
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- EventSource.scala
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def
create(uri: Uri, send: Function[HttpRequest, CompletionStage[HttpResponse]], lastEventId: Optional[String], system: ClassicActorSystemProvider): Source[ServerSentEvent, NotUsed]
- uri
URI with absolute path, e.g. "http://myserver/events
- send
function to send a HTTP request
- lastEventId
initial value for Last-Evend-ID header, optional
- system
actor system (classic or new API)
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continuous source of server-sent events
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def
create(uri: Uri, send: Function[HttpRequest, CompletionStage[HttpResponse]], lastEventId: Optional[String], mat: Materializer): Source[ServerSentEvent, NotUsed]
- uri
URI with absolute path, e.g. "http://myserver/events
- send
function to send a HTTP request
- lastEventId
initial value for Last-Evend-ID header, optional
- mat
Materializer
- returns
continuous source of server-sent events
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(Since version 3.0.0) pass in the actor system instead of the materializer
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(Since version ) see corresponding Javadoc for more information.