Composing REST Services

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Cesare Pautasso

Dagstuhl Seminar on Software Service Engineering

Technologie

Composing REST Services Open Dagstuhl Session Cesare Pautasso Faculty of Informatics University of Lugano (USI), Switzerland http:// www.pautasso.info

[object Object],[object Object],Web Service Composition Today “ ” WSDL 1.1 WS-BPEL 2.0

RESTful Web Services APIs… WSDL 1.1 … do not use WSDL 1.1

[object Object],[object Object],[object Object],The Goal ,[object Object],One Solution: BPEL for REST

[object Object],[object Object],[object Object],The Goal ,[object Object],[object Object],Another Solution: JOpera

[object Object],[object Object],[object Object],[object Object],REST in one slide R PUT DELETE GET POST

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Challenges for Composition Languages

JOpera Example: Doodle Map Mashup ,[object Object]

Doodle Map Mashup Architecture Web Browser Workflow Engine RESTful Web Services APIs GET POST GET RESTful API

BPM Workflow Languages RESTful Web Service Composition

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Solution Space BPM Workflow Languages RESTful Web Service Composition BPM Workflow Languages RESTful Web Service Composition BPM Workflow Languages RESTful Web Service Composition

[object Object],1. Abstract Workflow Example: BPEL/WSDL (WS-BPEL 2.0 does not support WSDL 2.0) R PUT R GET R POST R DELETE

[object Object],2. Concrete Workflow: BPEL for REST <Put R> <Get R> <Post R> <Delete R>

BPEL for REST – New Activities/Handlers Web Service <invoke> Web Service <invoke> <receive> <reply> <receive> <put> <get> <post> <delete> <onPut> <onGet> <onPost> <onDelete> R esource PUT DELETE GET POST

[object Object],BPEL for REST – Resource Block BPEL for REST < Resource P > <onGet> < Put R > < Get S > </onGet> < Post R > < Delete S > </onDelete> </Resource> <onDelete> R PUT DELETE GET POST S PUT DELETE GET POST P PUT DELETE GET POST

3. RESTful Workflows P Use the resource interface abstraction to publish the state of the workflow

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Workflows as Resources – URI

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Reading the state of the workflow resources

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Creating new workflow resources

[object Object],[object Object],[object Object],[object Object],Updating the workflow resource

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Deleting workflow resources

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Discussion

[object Object],[object Object],[object Object],[object Object],Conclusion

[object Object],[object Object],[object Object],[object Object],Some References http://www.jopera.org/

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Composing REST Services

1. Composing REST Services Open Dagstuhl Session Cesare Pautasso Faculty of Informatics University of Lugano (USI), Switzerland http:// www.pautasso.info

3. RESTful Web Services APIs… WSDL 1.1 … do not use WSDL 1.1

9. Doodle Map Mashup Architecture Web Browser Workflow Engine RESTful Web Services APIs GET POST GET RESTful API

10.

11. BPM Workflow Languages RESTful Web Service Composition

12.

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15. BPEL for REST – New Activities/Handlers Web Service <invoke> Web Service <invoke> <receive> <reply> <receive> <put> <get> <post> <delete> <onPut> <onGet> <onPost> <onDelete> R esource PUT DELETE GET POST

16.

17. 3. RESTful Workflows P Use the resource interface abstraction to publish the state of the workflow

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