window
を分離するために使用することができますタイムライン。出力を保持するにはtakeLast
が使用されます。
let signal = Observable.interval(1000).take(4);
let input = Observable.interval(300).take(10).share();
let output = input
.do(value => console.log(`input = ${value}`))
.window(signal)
.do(() => console.log(`*** signal : end OLD and start NEW subObservable`))
.mergeMap(subObservable => {
return subObservable.takeLast(100);
})
.share()
output.subscribe(value => console.log(` output = ${value}`));
Observable.merge(input.mapTo(1), output.mapTo(-1))
.scan((count, diff) => {
return count + diff;
}, 0)
.subscribe(count => console.log(` count = ${count}`));
結果:
22:28:37.971 *** signal : end OLD and start NEW subObservable
22:28:38.289 input = 0
22:28:38.292 count = 1
22:28:38.575 input = 1
22:28:38.576 count = 2
22:28:38.914 input = 2
22:28:38.915 count = 3
<signal received>
22:28:38.977 output = 0
22:28:38.979 count = 2
22:28:38.980 output = 1
22:28:38.982 count = 1
22:28:38.984 output = 2
22:28:38.986 count = 0
22:28:38.988 *** signal : end OLD and start NEW subObservable
22:28:39.175 input = 3
22:28:39.176 count = 1
22:28:39.475 input = 4
22:28:39.478 count = 2
22:28:39.779 input = 5
22:28:39.780 count = 3
<signal received>
22:28:39.984 output = 3
22:28:39.985 count = 2
22:28:39.986 output = 4
22:28:39.988 count = 1
22:28:39.989 output = 5
22:28:39.990 count = 0
22:28:39.992 *** signal : end OLD and start NEW subObservable
22:28:40.075 input = 6
22:28:40.077 count = 1
22:28:40.377 input = 7
22:28:40.378 count = 2
22:28:40.678 input = 8
22:28:40.680 count = 3
22:28:40.987 input = 9
22:28:40.990 count = 4
<input completed>
22:28:40.992 output = 6
22:28:40.993 count = 3
22:28:40.995 output = 7
22:28:40.996 count = 2
22:28:40.998 output = 8
22:28:40.999 count = 1
22:28:41.006 output = 9
22:28:41.007 count = 0