1. Essential API Facade Patterns
Episode 1 - Composition
Santanu Dey
@Santanu_Dey
Brian Mulloy
Apigee
@landlessness @apigee

2. groups.google.com/group/api-craft

3. slideshare.net/apigee

4. youtube.com/apigee

5. @Santanu_Dey @landlessness
Santanu Dey Brian Mulloy

6. Webcast Series: API Facade Patterns
Episode 1
Composition
Episode 2
Session Management
Episode 3
One Phase to Two Phase Conversion
Episode 4
Synchronous to Asynchronous

7. Episode 1 : Composition Pattern
Problem
Solution
Benefits
Considerations

8. Problem

9. Scenario: Mash-up App
Service
1
Service
2
Client App
on device
Service
3

10. Problem
Establish device connection to three hosts
Negotiate API/Service security each time
Normalize data format inside the app logic on the device

11. Multiple Service Mash-up
Service
1
Network connection, negotiate security, data format & parsing
Service
2
Client App
on device
Service
3

12. Solution

13. API Service Layer
Service
1
API Service
Service 2
Layer
Client
Service
3

14. An Example
Service
1
Book a Cab App API 2. Book Cab Service
Service 2
Layer
Client
Service
3

15. Benefits

16. One-time authentication by the device.

17. Fewer network calls from a device.

18. Plug in a different service provider without
having to change the app.

19. Validate and control before the requests reach
the backend.

20. Request payload manipulation.

21. Opportunity to use Backend-as-a-Service with
no additional expense to the application logic.

22. Generate analytics.

23. Other Considerations

24. Few other scenarios
Parallel callouts
Compensation
Chatty Services

25. Parallel Callouts
Service
API
Book a Cab App from Service
present location Layer
Client
Service

26. Another Example: Chatty Services
1. Get user attributes
Service
2. Get recommended topics
Provide
r
3. Get recommended books
Client

27. Solution: Reduce Chattiness
1. Authenticate by API key
API 2. Get relevant user topics Service
Get a recommended
Service 2
book for a user
Layer
3. Get recommended books
Client

28. Questions?

29. THANK YOU
Subscribe to API webcasts at:
youtube.com/apigee

30. THANK YOU
Questions and ideas to:
groups.google.com/group/api-craft

31. THANK YOU
Contact us at:
@apigee
@Santanu_Dey
@landlessness