Add ExecuteParallel for making requests in parallel

[jbkly]

Is there any support for passing in an array of urls to GetJSON so you can get multiple resources with one get request?

[timhall]

@jbkly this is not currently implemented, but I've definitely thought about it. It would require some low-level changes to make it synchronous for GetJSON, but I'll see if I can include it / lay the groundwork for it in the work I'm doing for v4.0

[timhall]

I'm pushing this until after the v4.0.0 release. As far as I can tell, this should be feasible in both Windows and Mac, but it'll be a little bit of an undertaking. I'll use this issue for notes and design.

Initially design as a wrapper (like AsyncWrapper) for use like the following:

' WebParallelWrapper.cls
' @param {Array|Collection|Dictionary} Requests
Public Function ExecuteParallel(Requests As Variant) As Variant
    ' If Requests is Array return Array of WebResponse
    '                Collection -> Collection
    '                Dictionary -> Dictionary

    ' Dictionary is useful for named requests,
    ' but Array/Collection is probably most common use case
End Function

' YourModule.bas
Dim Client As New WebClient
' Setup Client...

Dim Wrapper As New WebParallelWrapper
Set Wrapper.Client = Client

Dim Requests() As WebRequest
' Or Requests As New Collection
' Or Requests As New Dictionary
' Setup and add requests...

Responses = Wrapper.ExecuteParallel(Requests)
' -> Responses = Array of WebResponse

Notes:

• Parallel cURL requests

[gerald2545]

Hi Tim, is this enhancement implemented? I'm really interested

Thank you

Gerald

[Sophist-UK]

See #206 for a better Async capability which allows requests in parallel. So you can already send them in one by one and process the requests via a call-back when they complete.

However this is Windows only - not being a Mac user I haven't been able to look at doing cUrl calls in parallel.

The ability to do multiple requests in parallel from one synchronous call would require a wrapper to make the requests and wait for all of them to complete before returning to the caller.