感謝以上的答覆。我的問題與使用rx而不是rxjs NPM模塊有關。在我卸載了rx並安裝了rxjs之後,所有示例都開始按預期使用併發。因此,具有Promises,Callbacks和Native Observables的http併發調用正常工作。
我在這裏發佈它們以防萬一任何人遇到類似問題並且可以排除故障。
基於HTTP的回調索取樣品:
var Rx = require('rxjs'),
request = require('request'),
request_rx = Rx.Observable.bindCallback(request.get);
var array = [
'https://httpbin.org/ip',
'https://httpbin.org/user-agent',
'https://httpbin.org/delay/3',
'https://httpbin.org/delay/3',
'https://httpbin.org/delay/3'
];
var source = Rx.Observable.from(array).mergeMap(httpGet, 1);
function httpGet(url) {
return request_rx(url);
}
var subscription = source.subscribe(
function (x, body) {
console.log('=====', x[1].body, '======');
},
function (err) {
console.log('Error: ' + err);
},
function() {
console.log('Completed');
});
答應爲基礎的樣品:
var Rx = require('rxjs'),
rp = require('request-promise');
var array = ['https://httpbin.org/ip', 'https://httpbin.org/user-agent',
'https://httpbin.org/delay/3',
'https://httpbin.org/delay/3',
'https://httpbin.org/delay/3'
];
var source = Rx.Observable.from(array).mergeMap(httpGet, 1);
function httpGet(url) {
return rp.get(url);
}
var results = [];
var subscription = source.subscribe(
function (x) {
console.log('=====', x, '======');
},
function (err) {
console.log('Error: ' + err);
},
function() {
console.log('Completed');
});
本地RxJS樣品:
var Rx = require('rxjs'),
superagent = require('superagent'),
Observable = require('rxjs').Observable;
var array = [
'https://httpbin.org/ip',
'https://httpbin.org/user-agent',
'https://httpbin.org/delay/10',
'https://httpbin.org/delay/2',
'https://httpbin.org/delay/2',
'https://httpbin.org/delay/1',
];
let start = (new Date()).getTime();
var source = Rx.Observable.from(array)
.mergeMap(httpGet, null, 1)
.timestamp()
.map(stamp => [stamp.timestamp - start, stamp.value]);
function httpGet(apiUrl) {
return Observable.create((observer) => {
superagent
.get(apiUrl)
.end((err, res) => {
if (err) {
return observer.onError(err);
}
let data,
inspiration;
data = JSON.parse(res.text);
inspiration = data;
observer.next(inspiration);
observer.complete();
});
});
}
var subscription = source.subscribe(
function (x) {
console.log('=====', x, '======');
});
請參閱http://stackoverflow.com/documentation/rxjs/8247/common-recipes/27973/sending-multiple-parallel-http-requests#t=201703261009146257815 – martin