Comments (3)
I've made this implementation, but behavior of count() is very weird !!!
const throughLimit= (fn, stream, maxConcurrency) => {
const running = flyd.stream(0);
const cache = [];
return flyd.combine((s, count, self, changed) => {
if(count() < maxConcurrency) {
count(count() + 1);
const value = includes(s, changed) ? s() : cache.pop();
if(value) fn(value, res => { count(count() - 1); self(res) });
}else if (includes(s, changed)){
cache.unshift(s());
}
}, [stream, running]);
};
Can we update a dependant stream inside a combine() body ?
from flyd.
let's forget the first buggy implementation!
here's a first version, with a mix of stream and recursive callbacks.
it's called as: const resStream = throughLimit(makeRequest, ulrsStream, 10)
Does anyone have a better idea ?
const throughLimit= (fn, stream, maxConcurrency) => {
let running = 0;
const cache = [];
const callFn = (value, cb) => {
fn(value, res => {
cb(res);
if(cache.length) {
const value = cache.pop();
running++;
callFn(value, cb);
}
});
};
return flyd.combine((s, self, changed) => {
if(running < maxConcurrency) {
running++;
callFn(s(), res => {
running--;
self(res);
});
}else{
cache.unshift(s());
}
}, [stream]);
};
from flyd.
You could use ramda to help you there
Maybe something like this could do the trick for you?
const urlStream = flyd.stream() // Stream string
const joinedUrlStream = urlStream
.pipe(flyd.scan(R.flip(R.append), [])) // Stream [string]
const requestStream = joinedUrlStream
.map(R.splitEvery(1000)) // Stream [[string]]
.map(async splitUrls => {
let result = []
for (const urls of splitUrls) {
result = result.concat(await Promise.all(urls.map(makeRequest)))
}
return result
}) // Stream Promise [Result]
const responseStream = requestStream
.chain(flyd.fromPromise) // Stream [Result]
from flyd.
Related Issues (20)
- add more dependency for existing combine HOT 7
- Merge stream delay HOT 6
- add package.module
- Drag 'n Drop example is broken HOT 2
- Compare previous state with current state HOT 14
- Feature Request - Supply metadata for a combined stream HOT 2
- Do you think this Promise -> Stream conversion is a right alternative way? HOT 6
- Wrong chain + setImmediate behavior HOT 1
- Benchmark against Most.js HOT 3
- Can flyd streams be made lazy ? HOT 9
- HELP: Trouble reading api documentation HOT 1
- Enhancement: Add Readonly-Streams (at least in Typings) HOT 3
- What's the motivation for ending a stream? HOT 3
- question on serialize stream
- from Node stream HOT 2
- Question: Required (code) complexity for higher-order streams HOT 10
- Support multiple operators for Pipe HOT 4
- [Help Needed] CombineLatest in the style of RxJs HOT 17
- Switch Latest without Ramda Dependency HOT 6
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from flyd.