Designing custom REST and SOAP interfaces on Force.com
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Designing custom REST and SOAP interfaces on Force.comDesigning custom REST and SOAP interfaces on Force.com
Steven Herod, Technical Director (Australia), Cloud Sherpas
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Steven HerodSteven Herod
Technical Director, Cloud Sherpas (Australia)
Technical Director, Cloud Sherpas (Australia)
• Use cases for custom interfaces
• Upsides and downsides
• Code walkthrough
• Best Practices
3 (example) use cases
• Multiple external parties need to log leads w/o duplicates
• Concern: 3rd Party needs to understand Salesforce and your data model
semantics and logic.
• Need to interact with a complex opportunity process/data model
• Concern: An internal business process with many rules needs to be
exposed to an external system.
• Your mobile app needs to modify multiple parts of the data model to
complete an action
• Concern: ‘Chatty’ network traffic, opportunity for failures at any point.
Benefits of going custom…• Transaction safety
• Update multiple objects in a single request
• Lower latency• Complete many activities in a single request
• Service Oriented • Offers a narrow/specific interface that allows you to expose only the aspects of the business
logic and data model that are needed.
• More Robust• Can unit tested.
• Controlled interface• A published and controlled interface specific to your business.
Caveats• Your ETL Tool may not understand custom REST/SOAP interfaces with
Salesforce.• An out of the box ‘Salesforce Adapter’ is not applicable here.
(Generic REST / SOAP should work however)
• You need to write code (and test coverage)• What was ‘no effort’ on the Salesforce side now becomes a Software
• Limits!• Request size (3MB)• SOQL query limits (100 per request)• Record modification limits(10,000 records touched)
For and against
A real life examplePublic Internet user clicks this button on a HerokuBased website or a Mobile app
Salesforce needs to do this
• Consciously design your API• Think about it! Govern it! Consider every method/operation! Document it!
• Fight for the user• Think: “What is easiest for the consumer of the interface?”
• Work with the platform• Salesforce REST != REST purist
• Salesforce SOAP != WS-*
• Consider how you will manage testing with external parties• Test data, test system availability…
Best Practices • Use Apex Wrapper Classes as Data Transfer Objects
• Refrain from sending or expecting sObjects or you may expose a lot of internal details
• Use a Services layer• Keep your business code out of the class that handles the public interface.
• Bake in versioning• Consider if you need to make a change to your interface
• Unit test all the things• The unit test is your insurance and means you can detect when declarative
changes affect your code
• Manage your transactions explicitly• Especially if you do exception trapping
• Use @future if you need to.• Shorten response times where its safe to go async
• Indicate in the Apex Class name that is a public interface
• Consider the error feedback• What does a API consumer see if things go wrong?
• Program defensively• Expect bad input
Finally… REST specific advice
• 1 Class per URL mapping = proliferation
• Don’t forget the Query String
• E.g. GET /LoanApplications/?daysSinceUpdate=5
• Watch your status codes and verbs!
• Use the right status code and the right verb (GET, PUT, POST)