io.reactivex.observable.extensions

Interface FuseToObservable<T>

Type Parameters:

T - the value type

public interface FuseToObservable<T>

Interface indicating a operator implementation can be macro-fused back to Observable in case the operator goes from Observable to some other reactive type and then the sequence calls for toObservable again:

 Single<Integer> single = Observable.range(1, 10).reduce((a, b) -> a + b);
 Observable<Integer> observable = single.toObservable();
 

The Single.toObservable() will check for this interface and call the fuseToObservable() to return an Observable which could be the Observable-specific implementation of reduce(BiFunction).

This causes a slight overhead in assembly time (1 instanceof check, 1 operator allocation and 1 dropped operator) but does not incur the conversion overhead at runtime.

Method Summary

Modifier and Type	Method and Description
Observable<T>	fuseToObservable() Returns a (direct) Observable for the operator.

Method Detail

fuseToObservable

Observable<T> fuseToObservable()

Returns a (direct) Observable for the operator.

The implementation should handle the necessary RxJavaPlugins wrapping.

Returns:

the Observable instance