Upcoming JDeveloper ADF Business Components REST support
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This document discusses upcoming support for REST web services in Oracle JDeveloper using ADF Business Components. Key points include: - Oracle has established REST standards for resource naming, URIs, metadata, pagination, security, and caching across all Oracle products. - ADF BC will generate RESTful services using JSON payloads from VO instances defined in a resource definition file. - Resources will include collections, single resources, and resources in a "context" that allow filtering and expanding links between related data. - Features like pagination, filtering, payload filtering, and a resource catalog will provide metadata about the REST resources and allow customized requests. - A new ADF Mobile REST Data Control is being developed
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Upcoming JDeveloper ADF Business Components REST support
- 1. <Insert Picture Here> Upcoming ADFBC REST Support in JDeveloper Steven Davelaar twitter:@stevendavelaar blog: http://www.ateam-oracle.com/ Oracle Fusion Middleware Architects Team (the “A-Team”)
- 2. Disclaimer The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.
- 3. Oracle and REST Web Services • Corporate-wide standardization committee to ensure consistency in REST services accross ALL products • Oracle REST Standards include standards for • Resource naming • Resource URI• Resource URI • Resource Metadata • Resource Catalog • Pagination • Security • Caching
- 4. Oracle REST API’s Use JSON Payload • JavaScript Object Notation • text-based open standard designed for human-readable data interchange. It is derived from the JavaScript scripting language for representing simplelanguage for representing simple data structures and associative arrays, called objects. Despite its relationship to JavaScript, it is language-independent, with parsers available for many languages.
- 5. Oracle and JSON Schema • JSON Schema is WSDL + XSD for JSON • Describes the available Resource URI’s, Request and Response MediaTypes, Resource metadata, etc. • Not an industry standard (yet) • Not yet widely adopted, though Google uses it • Extensible • Validation tools available • Oracle resource catalog will be based on JSON Schema with keyword extensions • Oracle will add more metadata for Data Controls / UI Generation
- 6. REST support in Future JDeveloper versions • New ADF BC REST wizard to generate RESTful services using JSON • New REST Data Control • No longer part of URL Data Control• No longer part of URL Data Control
- 7. ADF BC Rest Services • The resources are based on VO instances (and its accessors) and are defined by a Resource Definition File • Resource Departments: Based on DepartmentVO and its accessor to EmployeeVO • Resource Employees: Based on EmployeeVO • Each resource definition provides two kinds of resources: • Resource Collection • Resource
- 8. ADF BC Rest – Resource Collection • Departments • http://server/application/rest/Departments • Employees • http://server/application/rest/Employees • Employees in a "department context"• Employees in a "department context" • http://server/application/rest/Departments/10/Employees
- 9. ADF BC Rest – Single Resource • Department • http://server/application/rest/Departments/10 • Employee • http://server/application/rest/Employees/103 • Employee in a "department context"• Employee in a "department context" • http://server/application/rest/Departments/10/Employees/103
- 10. Application Module – REST Tab
- 13. ADF BC Rest - Expanding Links ?expand=EmployeesView
- 14. ADF BC Rest - No Links ?onlydata
- 15. ADF BC Rest - Pagination • Request param ‘limit’ specifies range size • Request param ‘offset’ specifies start index • Example: • /rest/Departments?limit=3&offset=0 • Retrieves first three departments• Retrieves first three departments
- 16. ADF BC Rest – Collection Filtering • Request param ‘query’ can specify “where clause” • Examples: • query={DepartmentName M*} -> Returns departments starting with M • query={DepartmentName *u*} -> Returns departments• query={DepartmentName *u*} -> Returns departments containing an ‘u’ in the name • query={DepartmentId < 40} -> Returns departments with Id lower than 40
- 17. ADF BC Rest – Payload Filtering • Request param ‘fields’ can specify comma-delimited list of attributes to include • Example: • /rest/Departments?fields=DepartmentName • Retutrns only DepartmentName in JSON payload• Retutrns only DepartmentName in JSON payload
- 18. ADF BC Rest – Resource Catalog http:/server/application/rest/describe • Lists all resources, attribute metadata, links, children, actions • Describe can also be done for one specific resource • http://server/application/rest/Departments/describe
- 19. D E M O N S T R A T I O ND E M O N S T R A T I O N Building REST Services with ADF BC
- 20. New ADF Mobile REST Data Control • Goal: Leverage ADF BC Rest Services • Support CRUD operations and provide data control operations that allow the developer to easily use declarative bindings • Use metadata exposed by the services' describe• Use metadata exposed by the services' describe • Support for links and relationships • Support for paging