sharereplay.md

Rx.Observable.prototype.shareReplay([bufferSize], [window], [scheduler])

Ⓢ

Returns an observable sequence that shares a single subscription to the underlying sequence replaying notifications subject to a maximum time length for the replay buffer.

This operator is a specialization of replay that connects to the connectable observable sequence when the number of observers goes from zero to one, and disconnects when there are no more observers.

Arguments

1. [bufferSize] (Number): Maximum element count of the replay buffer.
2. [window] (Number): Maximum time length of the replay buffer in milliseconds.
3. [scheduler] (Scheduler): Scheduler where connected observers within the selector function will be invoked on.

Returns

(Observable): An observable sequence that contains the elements of a sequence produced by multicasting the source sequence within a selector function.

Example

var interval = Rx.Observable.interval(1000);

var source = interval
    .take(4)
    .doAction(function (x) {
        console.log('Side effect');
    });

var published = source
    .shareReplay(3);

published.subscribe(createObserver('SourceA'));
published.subscribe(createObserver('SourceB'));

// Creating a third subscription after the previous two subscriptions have
// completed. Notice that no side effects result from this subscription,
// because the notifications are cached and replayed.
Rx.Observable
    .return(true)
    .delay(6000)
    .flatMap(published)
    .subscribe(createObserver('SourceC'));

function createObserver(tag) {
    return Rx.Observer.create(
        function (x) {
            console.log('Next: ' + tag + x);
        },
        function (err) {
            console.log('Error: ' + err);
        },
        function () {
            console.log('Completed');
        });
}

// => Side effect
// => Next: SourceA0
// => Next: SourceB0
// => Side effect
// => Next: SourceA1
// => Next: SourceB1
// => Side effect
// => Next: SourceA2
// => Next: SourceB2
// => Side effect
// => Next: SourceA3
// => Next: SourceB3
// => Completed
// => Completed
// => Next: SourceC1
// => Next: SourceC2
// => Next: SourceC3
// => Completed

Location

File:

• /src/core/linq/observable/sharereplay.js

Dist:

• rx.all.js
• rx.all.compat.js
• rx.binding.js
• rx.lite.js
• rx.lite.compat.js

Prerequisites:

• If using rx.binding.js
  • rx.js | rx.compat.js

NPM Packages:

• rx

NuGet Packages:

• RxJS-All
• RxJS-Binding
• RxJS-Lite

Unit Tests:

• /tests/observable/replay.js