Calling External Web Services in Parallel

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1

Hello everyone,

I am working on a use case and i need to call three external web services in parallel and consolidate the response into one.
What is the quickest way to do this in WM?

  • Vaibhav
2

Create a BPM process with a parallel gateway and a join, this way you get the parallel execution out of the box without specific coding.

3

Yes, you can go either by pub-sub and BPM.

Thanks,

4

Also try transformers if that helps.

5

Thanks Martin and MR for your reply. I will try these options but as of now I am more interested in writing a JS that helps me achieve this. I could find that we have to do it by calling Service.doThreadInvoke() and indeed it works but now I am faced with problem where I need to send a list to inputs when calling the service via dothreadInvoke(). I cannot find a method that actually accepts array as input. … doThreadInvoke(String ifc, String svc, IData input)
Any help with regard to this?

6

Hi Mahesh,

I doubt if transformer will give me parallel execution…

  • Vaibhav
7

What’s the idea behind transformers? They won’t be executed in parallel and having an external call inside a transformer will lead to difficult error handling and some other problems as well.

8

I try to avoid usage of dothreadInvoke as much as possible. Using this service you need to take care of a lot of things the system can handle for you. The standard patterns for parallel execution inside webMethods ESB is either using a BPM process or publish subscribe. Beside beeing easier to implement those patterns allow distribution on several different servers.

9
10

They don’t. The order of execution is not defined, therefore most people advise to assume they are executed in parallel, but in fact, they aren’t.

11

Just a try if not go with other options as suggested.

12

Using transformers is not the right option for this need. Go either by BPM or pub-sub or try a different approach.

Thanks,