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<div class="content" data-ice="content"><h1 data-ice="title">spec-js/operators/multicast-spec.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var Observable = Rx.Observable;
var Subject = Rx.Subject;
var ReplaySubject = Rx.ReplaySubject;
/** @test {multicast} */
describe('Observable.prototype.multicast', function () {
asDiagram('multicast(() => new Subject())')('should mirror a simple source Observable', function () {
var source = cold('--1-2---3-4--5-|');
var sourceSubs = '^ !';
var multicasted = source.multicast(function () { return new Subject(); });
var expected = '--1-2---3-4--5-|';
expectObservable(multicasted).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
multicasted.connect();
});
it('should accept Subjects', function (done) {
var expected = [1, 2, 3, 4];
var connectable = Observable.of(1, 2, 3, 4).multicast(new Subject());
connectable.subscribe(function (x) { chai_1.expect(x).to.equal(expected.shift()); }, function (x) {
done(new Error('should not be called'));
}, function () {
done();
});
connectable.connect();
});
it('should accept Subject factory functions', function (done) {
var expected = [1, 2, 3, 4];
var connectable = Observable.of(1, 2, 3, 4).multicast(function () { return new Subject(); });
connectable.subscribe(function (x) { chai_1.expect(x).to.equal(expected.shift()); }, function (x) {
done(new Error('should not be called'));
}, function () {
done();
});
connectable.connect();
});
it('should accept a multicast selector and connect to a hot source for each subscriber', function () {
var source = hot('-1-2-3----4-|');
var sourceSubs = ['^ !',
' ^ !',
' ^ !'];
var multicasted = source.multicast(function () { return new Subject(); }, function (x) { return x.zip(x, function (a, b) { return (parseInt(a) + parseInt(b)).toString(); }); });
var subscriber1 = hot('a| ').mergeMapTo(multicasted);
var expected1 = '-2-4-6----8-|';
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var expected2 = ' -6----8-|';
var subscriber3 = hot(' c| ').mergeMapTo(multicasted);
var expected3 = ' --8-|';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should accept a multicast selector and connect to a cold source for each subscriber', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = ['^ !',
' ^ !',
' ^ !'];
var multicasted = source.multicast(function () { return new Subject(); }, function (x) { return x.zip(x, function (a, b) { return (parseInt(a) + parseInt(b)).toString(); }); });
var expected1 = '-2-4-6----8-|';
var expected2 = ' -2-4-6----8-|';
var expected3 = ' -2-4-6----8-|';
var subscriber1 = hot('a| ').mergeMapTo(multicasted);
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var subscriber3 = hot(' c| ').mergeMapTo(multicasted);
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should accept a multicast selector and respect the subject\'s messaging semantics', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = ['^ !',
' ^ !',
' ^ !'];
var multicasted = source.multicast(function () { return new ReplaySubject(1); }, function (x) { return x.concat(x.takeLast(1)); });
var expected1 = '-1-2-3----4-(4|)';
var expected2 = ' -1-2-3----4-(4|)';
var expected3 = ' -1-2-3----4-(4|)';
var subscriber1 = hot('a| ').mergeMapTo(multicasted);
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var subscriber3 = hot(' c| ').mergeMapTo(multicasted);
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should do nothing if connect is not called, despite subscriptions', function () {
var source = cold('--1-2---3-4--5-|');
var sourceSubs = [];
var multicasted = source.multicast(function () { return new Subject(); });
var expected = '-';
expectObservable(multicasted).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should multicast the same values to multiple observers', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = '^ !';
var multicasted = source.multicast(function () { return new Subject(); });
var subscriber1 = hot('a| ').mergeMapTo(multicasted);
var expected1 = '-1-2-3----4-|';
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var expected2 = ' -3----4-|';
var subscriber3 = hot(' c| ').mergeMapTo(multicasted);
var expected3 = ' --4-|';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
multicasted.connect();
});
it('should multicast an error from the source to multiple observers', function () {
var source = cold('-1-2-3----4-#');
var sourceSubs = '^ !';
var multicasted = source.multicast(function () { return new Subject(); });
var subscriber1 = hot('a| ').mergeMapTo(multicasted);
var expected1 = '-1-2-3----4-#';
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var expected2 = ' -3----4-#';
var subscriber3 = hot(' c| ').mergeMapTo(multicasted);
var expected3 = ' --4-#';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
multicasted.connect();
});
it('should multicast the same values to multiple observers, ' +
'but is unsubscribed explicitly and early', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = '^ ! ';
var multicasted = source.multicast(function () { return new Subject(); });
var unsub = ' u ';
var subscriber1 = hot('a| ').mergeMapTo(multicasted);
var expected1 = '-1-2-3---- ';
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var expected2 = ' -3---- ';
var subscriber3 = hot(' c| ').mergeMapTo(multicasted);
var expected3 = ' -- ';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
// Set up unsubscription action
var connection;
expectObservable(hot(unsub).do(function () {
connection.unsubscribe();
})).toBe(unsub);
connection = multicasted.connect();
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = '^ ! ';
var multicasted = source
.mergeMap(function (x) { return Observable.of(x); })
.multicast(function () { return new Subject(); });
var subscriber1 = hot('a| ').mergeMapTo(multicasted);
var expected1 = '-1-2-3---- ';
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var expected2 = ' -3---- ';
var subscriber3 = hot(' c| ').mergeMapTo(multicasted);
var expected3 = ' -- ';
var unsub = ' u ';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
// Set up unsubscription action
var connection;
expectObservable(hot(unsub).do(function () {
connection.unsubscribe();
})).toBe(unsub);
connection = multicasted.connect();
});
it('should multicast an empty source', function () {
var source = cold('|');
var sourceSubs = '(^!)';
var multicasted = source.multicast(function () { return new Subject(); });
var expected = '|';
expectObservable(multicasted).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
multicasted.connect();
});
it('should multicast a never source', function () {
var source = cold('-');
var sourceSubs = '^';
var multicasted = source.multicast(function () { return new Subject(); });
var expected = '-';
expectObservable(multicasted).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
multicasted.connect();
});
it('should multicast a throw source', function () {
var source = cold('#');
var sourceSubs = '(^!)';
var multicasted = source.multicast(function () { return new Subject(); });
var expected = '#';
expectObservable(multicasted).toBe(expected);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
multicasted.connect();
});
describe('with refCount() and subject factory', function () {
it('should connect when first subscriber subscribes', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = ' ^ !';
var multicasted = source.multicast(function () { return new Subject(); }).refCount();
var subscriber1 = hot(' a| ').mergeMapTo(multicasted);
var expected1 = ' -1-2-3----4-|';
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var expected2 = ' -3----4-|';
var subscriber3 = hot(' c| ').mergeMapTo(multicasted);
var expected3 = ' --4-|';
expectObservable(subscriber1).toBe(expected1);
expectObservable(subscriber2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should disconnect when last subscriber unsubscribes', function () {
var source = cold('-1-2-3----4-|');
var sourceSubs = ' ^ ! ';
var multicasted = source.multicast(function () { return new Subject(); }).refCount();
var subscriber1 = hot(' a| ').mergeMapTo(multicasted);
var unsub1 = ' ! ';
var expected1 = ' -1-2-3-- ';
var subscriber2 = hot(' b| ').mergeMapTo(multicasted);
var unsub2 = ' ! ';
var expected2 = ' -3---- ';
expectObservable(subscriber1, unsub1).toBe(expected1);
expectObservable(subscriber2, unsub2).toBe(expected2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be retryable when cold source is synchronous', function () {
function subjectFactory() { return new Subject(); }
var source = cold('(123#)');
var multicasted = source.multicast(subjectFactory).refCount();
var subscribe1 = 's ';
var expected1 = '(123123123123#) ';
var subscribe2 = ' s ';
var expected2 = ' (123123123123#)';
var sourceSubs = ['(^!)',
'(^!)',
'(^!)',
'(^!)',
' (^!)',
' (^!)',
' (^!)',
' (^!)'];
expectObservable(hot(subscribe1).do(function () {
expectObservable(multicasted.retry(3)).toBe(expected1);
})).toBe(subscribe1);
expectObservable(hot(subscribe2).do(function () {
expectObservable(multicasted.retry(3)).toBe(expected2);
})).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be retryable with ReplaySubject and cold source is synchronous', function () {
function subjectFactory() { return new Rx.ReplaySubject(1); }
var source = cold('(123#)');
var multicasted = source.multicast(subjectFactory).refCount();
var subscribe1 = 's ';
var expected1 = '(123123123123#) ';
var subscribe2 = ' s ';
var expected2 = ' (123123123123#)';
var sourceSubs = ['(^!)',
'(^!)',
'(^!)',
'(^!)',
' (^!)',
' (^!)',
' (^!)',
' (^!)'];
expectObservable(hot(subscribe1).do(function () {
expectObservable(multicasted.retry(3)).toBe(expected1);
})).toBe(subscribe1);
expectObservable(hot(subscribe2).do(function () {
expectObservable(multicasted.retry(3)).toBe(expected2);
})).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be repeatable when cold source is synchronous', function () {
function subjectFactory() { return new Subject(); }
var source = cold('(123|)');
var multicasted = source.multicast(subjectFactory).refCount();
var subscribe1 = 's ';
var expected1 = '(123123123123123|) ';
var subscribe2 = ' s ';
var expected2 = ' (123123123123123|)';
var sourceSubs = ['(^!)',
'(^!)',
'(^!)',
'(^!)',
'(^!)',
' (^!)',
' (^!)',
' (^!)',
' (^!)',
' (^!)'];
expectObservable(hot(subscribe1).do(function () {
expectObservable(multicasted.repeat(5)).toBe(expected1);
})).toBe(subscribe1);
expectObservable(hot(subscribe2).do(function () {
expectObservable(multicasted.repeat(5)).toBe(expected2);
})).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be repeatable with ReplaySubject and cold source is synchronous', function () {
function subjectFactory() { return new Rx.ReplaySubject(1); }
var source = cold('(123|)');
var multicasted = source.multicast(subjectFactory).refCount();
var subscribe1 = 's ';
var expected1 = '(123123123123123|) ';
var subscribe2 = ' s ';
var expected2 = ' (123123123123123|)';
var sourceSubs = ['(^!)',
'(^!)',
'(^!)',
'(^!)',
'(^!)',
' (^!)',
' (^!)',
' (^!)',
' (^!)',
' (^!)'];
expectObservable(hot(subscribe1).do(function () {
expectObservable(multicasted.repeat(5)).toBe(expected1);
})).toBe(subscribe1);
expectObservable(hot(subscribe2).do(function () {
expectObservable(multicasted.repeat(5)).toBe(expected2);
})).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be retryable', function () {
function subjectFactory() { return new Subject(); }
var source = cold('-1-2-3----4-# ');
var sourceSubs = ['^ ! ',
' ^ ! ',
' ^ !'];
var multicasted = source.multicast(subjectFactory).refCount();
var subscribe1 = 's ';
var expected1 = '-1-2-3----4--1-2-3----4--1-2-3----4-#';
var subscribe2 = ' s ';
var expected2 = ' -3----4--1-2-3----4--1-2-3----4-#';
expectObservable(hot(subscribe1).do(function () {
expectObservable(multicasted.retry(2)).toBe(expected1);
})).toBe(subscribe1);
expectObservable(hot(subscribe2).do(function () {
expectObservable(multicasted.retry(2)).toBe(expected2);
})).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be retryable using a ReplaySubject', function () {
function subjectFactory() { return new Rx.ReplaySubject(1); }
var source = cold('-1-2-3----4-# ');
var sourceSubs = ['^ ! ',
' ^ ! ',
' ^ !'];
var multicasted = source.multicast(subjectFactory).refCount();
var expected1 = '-1-2-3----4--1-2-3----4--1-2-3----4-#';
var subscribe2 = time('----| ');
var expected2 = ' 23----4--1-2-3----4--1-2-3----4-#';
expectObservable(multicasted.retry(2)).toBe(expected1);
rxTestScheduler.schedule(function () {
return expectObservable(multicasted.retry(2)).toBe(expected2);
}, subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be repeatable', function () {
function subjectFactory() { return new Subject(); }
var source = cold('-1-2-3----4-| ');
var sourceSubs = ['^ ! ',
' ^ ! ',
' ^ !'];
var multicasted = source.multicast(subjectFactory).refCount();
var subscribe1 = 's ';
var expected1 = '-1-2-3----4--1-2-3----4--1-2-3----4-|';
var subscribe2 = ' s ';
var expected2 = ' -3----4--1-2-3----4--1-2-3----4-|';
expectObservable(hot(subscribe1).do(function () {
expectObservable(multicasted.repeat(3)).toBe(expected1);
})).toBe(subscribe1);
expectObservable(hot(subscribe2).do(function () {
expectObservable(multicasted.repeat(3)).toBe(expected2);
})).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
it('should be repeatable using a ReplaySubject', function () {
function subjectFactory() { return new Rx.ReplaySubject(1); }
var source = cold('-1-2-3----4-| ');
var sourceSubs = ['^ ! ',
' ^ ! ',
' ^ !'];
var multicasted = source.multicast(subjectFactory).refCount();
var subscribe1 = 's ';
var expected1 = '-1-2-3----4--1-2-3----4--1-2-3----4-|';
var subscribe2 = ' s ';
var expected2 = ' 23----4--1-2-3----4--1-2-3----4-|';
expectObservable(hot(subscribe1).do(function () {
expectObservable(multicasted.repeat(3)).toBe(expected1);
})).toBe(subscribe1);
expectObservable(hot(subscribe2).do(function () {
expectObservable(multicasted.repeat(3)).toBe(expected2);
})).toBe(subscribe2);
expectSubscriptions(source.subscriptions).toBe(sourceSubs);
});
});
it('should multicast one observable to multiple observers', function (done) {
var results1 = [];
var results2 = [];
var subscriptions = 0;
var source = new Observable(function (observer) {
subscriptions++;
observer.next(1);
observer.next(2);
observer.next(3);
observer.next(4);
observer.complete();
});
var connectable = source.multicast(function () {
return new Subject();
});
connectable.subscribe(function (x) {
results1.push(x);
});
connectable.subscribe(function (x) {
results2.push(x);
});
chai_1.expect(results1).to.deep.equal([]);
chai_1.expect(results2).to.deep.equal([]);
connectable.connect();
chai_1.expect(results1).to.deep.equal([1, 2, 3, 4]);
chai_1.expect(results1).to.deep.equal([1, 2, 3, 4]);
chai_1.expect(subscriptions).to.equal(1);
done();
});
it('should remove all subscribers from the subject when disconnected', function () {
var subject = new Subject();
var expected = [1, 2, 3, 4];
var i = 0;
var source = Observable.from([1, 2, 3, 4]).multicast(subject);
source.subscribe(function (x) {
chai_1.expect(x).to.equal(expected[i++]);
});
source.connect();
chai_1.expect(subject.observers.length).to.equal(0);
});
describe('when given a subject factory', function () {
it('should allow you to reconnect by subscribing again', function (done) {
var expected = [1, 2, 3, 4];
var i = 0;
var source = Observable.of(1, 2, 3, 4).multicast(function () { return new Subject(); });
source.subscribe(function (x) {
chai_1.expect(x).to.equal(expected[i++]);
}, null, function () {
i = 0;
source.subscribe(function (x) {
chai_1.expect(x).to.equal(expected[i++]);
}, null, done);
source.connect();
});
source.connect();
});
it('should not throw ObjectUnsubscribedError when used in ' +
'a switchMap', function (done) {
var source = Observable.of(1, 2, 3)
.multicast(function () { return new Subject(); })
.refCount();
var expected = ['a1', 'a2', 'a3', 'b1', 'b2', 'b3', 'c1', 'c2', 'c3'];
Observable.of('a', 'b', 'c')
.switchMap(function (letter) { return source.map(function (n) { return String(letter + n); }); })
.subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, function (x) {
done(new Error('should not be called'));
}, function () {
chai_1.expect(expected.length).to.equal(0);
done();
});
});
});
describe('when given a subject', function () {
it('should not throw ObjectUnsubscribedError when used in ' +
'a switchMap', function (done) {
var source = Observable.of(1, 2, 3)
.multicast(new Subject())
.refCount();
var expected = ['a1', 'a2', 'a3'];
Observable.of('a', 'b', 'c')
.switchMap(function (letter) { return source.map(function (n) { return String(letter + n); }); })
.subscribe(function (x) {
chai_1.expect(x).to.equal(expected.shift());
}, function (x) {
done(new Error('should not be called'));
}, function () {
chai_1.expect(expected.length).to.equal(0);
done();
});
});
});
});
//# sourceMappingURL=multicast-spec.js.map</code></pre>
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