react

Interface SignalView<T>

All Known Implementing Classes:

AbstractSignal, Signal, UnitSignal

public interface SignalView<T>

A view of a Signal, on which slots may listen, but to which one cannot emit events. This is generally used to provide signal-like views of changing entities. See AbstractValue for an example.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	SignalView.Listener<T> Used to observe events from a signal.

Method Summary

Modifier and Type	Method and Description
<M> SignalView<M>	collect(Function<? super T,M> collector) Creates a signal that maps the values emitted by this signal through collector and emits only the non-null values that are returned.
Connection	connect(SignalView.Listener<? super T> slot) Connects this signal to the supplied slot, such that when an event is emitted from this signal, the slot will be notified.
void	disconnect(SignalView.Listener<? super T> slot) Disconnects the supplied slot from this signal if connect was called with it.
SignalView<T>	filter(Function<? super T,Boolean> pred) Creates a signal that emits a value only when the supplied filter function returns true.
<M> SignalView<M>	map(Function<? super T,M> func) Creates a signal that maps this signal via a function.
RFuture<T>	next() Returns a future that is completed with the next value from this signal.

Method Detail

map

<M> SignalView<M> map(Function<? super T,M> func)

Creates a signal that maps this signal via a function. When this signal emits a value, the mapped signal will emit that value as transformed by the supplied function. The mapped signal will retain a connection to this signal for as long as it has connections of its own.

filter

SignalView<T> filter(Function<? super T,Boolean> pred)

Creates a signal that emits a value only when the supplied filter function returns true. The filtered signal will retain a connection to this signal for as long as it has connections of its own.

collect

<M> SignalView<M> collect(Function<? super T,M> collector)

Creates a signal that maps the values emitted by this signal through collector and emits only the non-null values that are returned. This allows you to perform a type-test on the values emitted by a signal and only emit values of the appropriate subtype.

next

RFuture<T> next()

Returns a future that is completed with the next value from this signal.

connect

Connection connect(SignalView.Listener<? super T> slot)

Connects this signal to the supplied slot, such that when an event is emitted from this signal, the slot will be notified.

Returns:

a connection instance which can be used to cancel the connection.

disconnect

void disconnect(SignalView.Listener<? super T> slot)

Disconnects the supplied slot from this signal if connect was called with it. If the slot has been connected multiple times, all connections are cancelled.