我有一个由插座提供的热Observable
。我可以使用pausable暂停套接字供稿。但是一旦“取消暂停”可观察对象,就需要显示套接字在暂停订阅时可能发送的最后一个值。我不想跟踪套接字手动发送的最后一个值。这怎么可能成立呢?
从文档中的示例,请参见下面的注释:
var pauser = new Rx.Subject();
var source = Rx.Observable.fromEvent(document, 'mousemove').pausable(pauser);
var subscription = source.subscribe(
function (x) {
//somehow after pauser.onNext(true)...push the last socket value sent while this was paused...
console.log('Next: ' + x.toString());
},
function (err) {
console.log('Error: ' + err);
},
function () {
console.log('Completed');
});
// To begin the flow
pauser.onNext(true);
// To pause the flow at any point
pauser.onNext(false);
您甚至不需要pausable
即可执行此操作。 (还要注意,您标记了RxJS5,但pausable
仅存在于RxJS 4
中)。您只需要将pauser
转换为高阶Observable
:
var source = Rx.Observable.fromEvent(document, 'mousemove')
// Always preserves the last value sent from the source so that
// new subscribers can receive it.
.publishReplay(1);
pauser
// Close old streams (also called flatMapLatest)
.switchMap(active =>
// If the stream is active return the source
// Otherwise return an empty Observable.
Rx.Observable.if(() => active, source, Rx.Observable.empty())
)
.subscribe(/**/)
//Make the stream go live
source.connect();