So with some help, this is what I have so far:
private initiateAnalysis() {
this.initiateRequest$().pipe( // sends the first request to start the
analysis
switchMap(() => interval(1000)), // when the response comes back, start
emitting an event every second from this observable
mergeMap(() => this.checkForResponse$()), // each second, send the GET
request and emit the results. Merge all the results into the resulting
observable
filter(results => this.isAnalysisComplete(results)), // filter out the
results if they are not the final, correct results
first() // only take the first complete results, to avoid continuing
sending GET requests
).subscribe(results => this.showResults(results));
}
private initiateRequest$(): Observable<void> {
const params = {
};
return this.problemsService.postRequest('postURL', {}, params)
}
private checkForResponse$(): Observable<Results>{
const params = {
};
return this.problemsService.getResults('someURL', params);
}
private showResults(results: Results) {
console.log('results', results);
}
Except this has one problem. The above code stops processing with the first
result from the get.
Not my use case. I need to get a response from the http get call, check the
result for some condition, only if the condition
is met, I stop and show the results.
How can I pull that off?
On Monday, October 1, 2018 at 11:02:21 AM UTC-7, Reza Razavipour wrote:
>
> Using Angular CLI 6 for a Single Page Application
>
> What I need to do is the following
> make an HTTP post request. I will get an OK back. The results or the side
> effect will take sometime before is ready for processing.
> I will have to poll for results readiness, lets say once a second.
>
> To poll for the results, I need to make an HTTP get call and check the
> results. If results are complete, I am done.
> Otherwise I will have to continue to poll..
>
> What I have done, I have two obserables, one for the HTTP post and one for
> HTTP get call.
> I use a setTimeout for the polling. This organization for the code, when I
> hit the setTimeout, I go to never never land I have to kill the
> application...
>
> Any hints on this problem?
>
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