io.vertx.rx.java

Class ReadStreamSubscriber<R,J>

java.lang.Object

rx.Subscriber<R>

io.vertx.rx.java.ReadStreamSubscriber<R,J>

All Implemented Interfaces:

ReadStream<J>, StreamBase, rx.Observer<R>, rx.Subscription

public class ReadStreamSubscriber<R,J>
extends rx.Subscriber<R>
implements ReadStream<J>

An RxJava Subscriber that turns an Observable into a ReadStream.

The stream implements the pause() and resume() operation by maintaining a buffer of BUFFER_SIZE elements between the Observable and the ReadStream.

When the subscriber is created it requests 0 elements to activate the subscriber's back-pressure. Setting the handler initially on the ReadStream triggers a request of BUFFER_SIZE elements. When the item buffer is half empty, new elements are requested to fill the buffer back to BUFFER_SIZE elements.

The #endHandler(Handler) is called when the Observable is completed or has failed and no pending elements, emitted before the completion or failure, are still in the buffer, i.e the handler is not called when the stream is paused.

Author:

Julien Viet

Field Summary

Fields

Modifier and Type	Field and Description
static int	BUFFER_SIZE

Constructor Summary

Constructors

Constructor and Description
ReadStreamSubscriber(Function<R,J> adapter, Consumer<rx.Subscriber<R>> doSubscribe)

Method Summary

Modifier and Type	Method and Description
static <R,J> ReadStream<J>	asReadStream(rx.Observable<R> observable, Function<R,J> adapter)
ReadStream<J>	endHandler(Handler<Void> handler)
ReadStream<J>	exceptionHandler(Handler<Throwable> handler)
ReadStream<J>	fetch(long amount)
ReadStream<J>	handler(Handler<J> handler)
void	onCompleted()
void	onError(Throwable e)
void	onNext(R item)
ReadStream<J>	pause()
ReadStream<J>	resume()

Methods inherited from class rx.Subscriber

add, isUnsubscribed, onStart, request, setProducer, unsubscribe

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.vertx.core.streams.ReadStream

pipe, pipeTo, pipeTo

Field Detail

BUFFER_SIZE

public static final int BUFFER_SIZE

See Also:

Constant Field Values

Constructor Detail

ReadStreamSubscriber

public ReadStreamSubscriber(Function<R,J> adapter,
                            Consumer<rx.Subscriber<R>> doSubscribe)

Method Detail

asReadStream

public static <R,J> ReadStream<J> asReadStream(rx.Observable<R> observable,
                                               Function<R,J> adapter)

handler

public ReadStream<J> handler(Handler<J> handler)

Specified by:

handler in interface ReadStream<J>

pause

public ReadStream<J> pause()

Specified by:

pause in interface ReadStream<J>

fetch

public ReadStream<J> fetch(long amount)

Specified by:

fetch in interface ReadStream<J>

resume

public ReadStream<J> resume()

Specified by:

resume in interface ReadStream<J>

endHandler

public ReadStream<J> endHandler(Handler<Void> handler)

Specified by:

endHandler in interface ReadStream<J>

exceptionHandler

public ReadStream<J> exceptionHandler(Handler<Throwable> handler)

Specified by:

exceptionHandler in interface ReadStream<J>

Specified by:

exceptionHandler in interface StreamBase

onCompleted

public void onCompleted()

Specified by:

onCompleted in interface rx.Observer<R>

onError

public void onError(Throwable e)

Specified by:

onError in interface rx.Observer<R>

onNext

public void onNext(R item)

Specified by:

onNext in interface rx.Observer<R>