Hi Peter,
Answers to your questions:
Would I need to identify which packages the content is in and then download these packages from SAP service marketplace? And has this to be done on PI side or on the backend side? Or both?
You need to ensure that the content exists on both if you want to use SAP PI to customize the SAP standard enterprise services & create proxies in the back-end (ECC). You could also just use the standard services as they come shipped from SAP, in that case you just need to ensure that the content exists in ECC.
If I then want to use one of those standard webservices, e.g. "Find Customer Address Basic Data by Name and Address", where would the service call be directed to? To SAP PI or to the backend system?
It depends how you set up your scenario. You could have the web service mediated through SAP PI or another ESB (Enterprise Service Bus) using different technology. In that case, the service call will be directed to SAP (or ESB) & then the back-end. You could also setup a point-to-point scenario where the service call is routed from the consumer straight to the back-end. Ultimately, the call has to reach the ECC back-end to process, what changes is what is put in betwwen the consumer & the ECC back-end.
If I have a Webservice which should extract mass data, e.g. data about all customers - would this be a feasible web service scenario? Or a web services only used to extract single customers in general? I wonder about things like performance, timeouts, error handling, etc.
I wouldn't recommend this kind of scenario when using web services. It would more relevant for maybe batch or asynchronous scenarios, also maybe mediated through SAP PI. All your concerns are valid.
What tool is at the moment used for composing web services? Is it some design tool on PI (BPM?) or is it rather Visual Composer on CE or even WebDynpro (ABAP or Java?)
This question isn't all that clear. For web services 'Composition' you can use the ESR (Enterprise Service Repository) that comes shipped with SAP PI or SAP CE. ccBPM in SAP PI is used for async messaging so that can't work for web services.
For 'Orchestration' of web services, SAP CE would be your preferred tool & you could also use Netweaver BPM that comes with CE to orchestrate several web service calls for a specific business process. This doesn't stop you from using anything else (like Java for example) to do your orchestration but you want the flexibility of being able to change a business process on the fly & SAP CE with BPM provides this.
Regards, Trevor
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