Package rx.internal.operators

Class BufferUntilSubscriber<T>

java.lang.Object

rx.Observable<T>

rx.subjects.Subject<T,T>

rx.internal.operators.BufferUntilSubscriber<T>

Type Parameters:

T - the type of the items to be buffered

All Implemented Interfaces:

Observer<T>

public final class BufferUntilSubscriber<T>
extends Subject<T,T>

A solution to the "time gap" problem that occurs with groupBy and pivot.

This currently has temporary unbounded buffers. It needs to become bounded and then do one of two things:

1. blow up and make the user do something about it
2. work with the backpressure solution ... still to be implemented (such as co-routines)

Generally the buffer should be very short lived (milliseconds) and then stops being involved. It can become a memory leak though if a GroupedObservable backed by this class is emitted but never subscribed to (such as filtered out). In that case, either a time-bomb to throw away the buffer, or just blowing up and making the user do something about it is needed.

For example, to filter out GroupedObservables, perhaps they need a silent subscribe() on them to just blackhole the data.

This is an initial start at solving this problem and solves the immediate problem of groupBy and pivot and trades off the possibility of memory leak for deterministic functionality.

See Also:

• the Github issue describing the time gap problem

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static final class	BufferUntilSubscriber.OnSubscribeAction<T>
(package private) static final class	BufferUntilSubscriber.State<T>	The common state.

Nested classes/interfaces inherited from class rx.Observable

Observable.OnSubscribe<T>, Observable.Operator<R,T>, Observable.Transformer<T,R>

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final Observer	EMPTY_OBSERVER
private boolean	forward
(package private) final BufferUntilSubscriber.State<T>	state

Constructor Summary

Constructors

Modifier	Constructor	Description
private	BufferUntilSubscriber(BufferUntilSubscriber.State<T> state)

Method Summary

Modifier and Type	Method	Description
static <T> BufferUntilSubscriber<T>	create()	Creates a default, unbounded buffering Subject instance.
private void	emit(Object v)
boolean	hasObservers()	Indicates whether the Subject has Observers subscribed to it.
void	onCompleted()	Notifies the Observer that the Observable has finished sending push-based notifications.
void	onError(Throwable e)	Notifies the Observer that the Observable has experienced an error condition.
void	onNext(T t)	Provides the Observer with a new item to observe.

Methods inherited from class rx.subjects.Subject

toSerialized

Methods inherited from class rx.Observable

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Methods inherited from class java.lang.Object

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

Field Details

state

final BufferUntilSubscriber.State<T> state

forward

private boolean forward

EMPTY_OBSERVER

static final Observer EMPTY_OBSERVER

Constructor Details

BufferUntilSubscriber

private BufferUntilSubscriber(BufferUntilSubscriber.State<T> state)

Method Details

create

public static <T> BufferUntilSubscriber<T> create()

Creates a default, unbounded buffering Subject instance.

Type Parameters:

T - the value type

Returns:

the instance

emit

private void emit(Object v)

onCompleted

public void onCompleted()

Description copied from interface: Observer

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

The Observable will not call this method if it calls Observer.onError(java.lang.Throwable).

onError

public void onError(Throwable e)

Description copied from interface: Observer

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

If the Observable calls this method, it will not thereafter call Observer.onNext(T) or Observer.onCompleted().

Parameters:

e - the exception encountered by the Observable

onNext

public void onNext(T t)

Description copied from interface: Observer

Provides the Observer with a new item to observe.

The Observable may call this method 0 or more times.

The Observable will not call this method again after it calls either Observer.onCompleted() or Observer.onError(java.lang.Throwable).

Parameters:

t - the item emitted by the Observable

hasObservers

public boolean hasObservers()

Description copied from class: Subject

Indicates whether the Subject has Observers subscribed to it.

Specified by:

hasObservers in class Subject<T,T>

Returns:

true if there is at least one Observer subscribed to this Subject, false otherwise