var drop = false;
doRequestA(handleRequest);
doRequestB(handleRequest);
doRequestC(handleRequest);
function handleRequest(err, response) {
if (err) {
return;
}
if (drop) {
return;
}
drop = true;
doSomethingWithResponse(response);
}
OR
var requests = [];
requests.push(doRequestA(handleResponse));
requests.push(doRequestB(handleResponse))
requests.push(doRequestC(handleResponse))
function handleResponse(err, response) {
var r;
while(r = requests.shift()) {
terminateRequest(r);
}
doSomethingWithResponse(response);
}
in each case, doSomethingWithResponse ends the express response with the
results.
On Monday, 1 July 2013 21:47:54 UTC+2, Nate D wrote:
>
> Sorry for long title, been hunting around trying to find a usable
> example/pattern to solve this pattern, no luck yet.
>
> I am building a service to take REST calls to an express fronted service.
> A search is being performed, and for each search request coming into
> express I need to perform 3-5 parallel requests to various
> databases/indexes/etc.
>
> The behavior is such that we want to get a response back ASAP to the user,
> and want to search across all sources in parallel, but early terminate as
> soon as the first one returns a found result and push the result to the end
> user.
>
> Have used async module for some tasks, but not sure its a workable thing
> to bolt into express routes. Hoping to not have to hack into an existing
> module
>
> Any patterns or modules people have used to accomplish this "parallel with
> early termination/response" method?
>
>
> NOTE: not married to express, just need simple setup to take http/REST
> call and route to a function which will spin off the parallel calls and
> handle the response
>
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