Don't Reinvent the Wheel - Tips and tricks for rease in Oracle ADF - Luc Bors


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For ages we have known that reinventing the wheel is not a smart thing to do. However, we as software
developers tend to do this all the time. In this session you will learn how to avoid this by taking advantage of the
reuse capabilities of the ADF Framework. You will see how to create Page Templates and use them throughout
your application instead of creating the same complex layout over and over again. Next you will see how to create
a reusable skin to use in your applications. Finally you will see how to extend the ADF Component Library with
your own reusable declarative components and reuse them throughout your application.

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Don't Reinvent the Wheel - Tips and tricks for rease in Oracle ADF - Luc Bors

  1. 1. Luc Bors, june 2013, ODTUG KScope 2013 New Orleans Tips and Tricks for UI Reuse in Oracle ADF Don't Reinvent the Wheel
  2. 2. Who Am I • Luc Bors • Principal Consultant • AMIS Nieuwegein Netherlands • Friends of Oracle & Java • 5 Oracle ACE(D) • Oracle Partner
  3. 3. Topics • Reuse – ADF Controller and Faces – Page Templates – Declarative Components – Stylesheets – Task Flows
  4. 4. The (somewhat ugly) Sample Application
  5. 5. Page Templates • Specify the layout structure (of groups) of pages – For example: top bar, side bar, footer – Predefine placeholders for pages to inject their contents • Page can be based on template – It will provide the content for the placeholders (seen as facets) – It can pass parameters to the template – for example for the title of the page or the page bread crumb trail
  6. 6. Page Templates • Centrally specifying the overall structure and some of the look & feel for all or specific types of pages • Can also be applied dynamically, depending on some context settings – This allows a single page to be presented in different ways to different users or under different conditions – Templates allow different structure and component ordering for the same page • Page Templates make maintenance of the overall layout structure much easier
  7. 7. Page Templates • Create a Page Template – Embed one or more facetRef elements for the holes to be filled by the pages based on the template – Publish the template “API” – the input parameters it supports • Create pages based on the template – In these pages, provide content for the facets exposed by the template – Provide values for input parameters supported by template • At any point in time: – change the template (reusing same facetRefs and parameters) – change the facet contents in any page – change template ref in a page (to template with same facets) • Can be done dynamically
  8. 8. Defining the template
  9. 9. Building the Layout
  10. 10. Using the Attributes
  11. 11. The Template Definition
  12. 12. The Template UI components
  13. 13. Demo
  14. 14. Custom Components • Compose reusable ‘packages’ for frequently occurring combinations of ADF Faces/JSF components – Declarative reuse for consistency and productivity – Better encapsulation than page fragments – Internally a declarative component is built out of a combination of JSF components • Declarative components can be used like normal JSF components – They expose a number of attributes (that are wired to attributes of the internal JSF components) – They may have facets (to embed other JSF components) • Examples: LOV/DropDown Switcher, InputTime, Selection components for static domains, Button bars
  15. 15. Custom Components • Choose JSF Declarative Component in the New Gallery • Specify the properties for the component – Name, Package, TaglibName – The attributes exposed to consumers of the components • And default values for the attributes – Methods – name and signature – to use for method bindings – Names of the facets that are published (and that will be used to embed JSF content inside the declarative component) • Create the content of the Component by assembling JSF components – much like you do for a Page Template – Using facetRef components, #{attrs.<attrName>} and #{component.<methodName>}
  16. 16. Create Custom Component
  17. 17. Defining the Component
  18. 18. Building the UI
  19. 19. Demo
  20. 20. Stylesheets
  21. 21. Demo
  22. 22. Overview • Reusable components – Bounded Task Flows – Multi page, isolated memory scope – Controller and flow logic, executing business logic – Interface with input parameters and output events – Dynamically switching between regions – Role based authorization – Transaction management – Savepoints and Rollback support • Unbounded Task Flow – Bookmarking, …
  23. 23. Examples
  24. 24. Create a Bounded Task Flow
  25. 25. Taskflows
  26. 26. Building a Reusable Task Flow Catalog • Organizations may create a catalog of task flows • Reusable services, encapsulated with clear interfaces – Input parameters – Result – Events published • Such task flows can also be published by – Third parties – ‘the community’
  27. 27. Demo
  28. 28. Reusing Reusables: ADF Libraries • Sharing reusable assets – Task Flows, Stylsheets, PageTemplates and Custom Components – can be deployed and distributed through ADF Libraries (JAR files, design time) – ADF Libraries are added to consuming applications – When added, components from library can be reused in consuming application
  29. 29. ADF Libraries • ADF Library enables you to reuse components: – Package them into ADF Library JAR files – Add them to a reusable component repository – Add the library to a project to use its components
  30. 30. How does it work • Deploy the project that contains the component(s) to an ADF Library JAR – JDeveloper automatically adds the required Tag library for the declarative component(s) • Add the Library in consuming projects – Via the Resource Palette • Declarative components will show up on the Component Palette – They are used like normal components with attributes, method bindings and facets
  31. 31. Deployment Profile
  32. 32. Library Deployment
  33. 33. Using an ADF Library
  34. 34. Libraries are added
  35. 35. What do we have so far ? • ADF Page Template • ADF Custom Component • ADF Style sheet • ADF Taskflow
  36. 36. Using the Template
  37. 37. Setting attribute values
  38. 38. Using the Stylesheet
  39. 39. Using the Custom Component
  40. 40. Using the Taskflow
  41. 41. Setting up the region
  42. 42. Refreshing the region
  43. 43. Demo
  44. 44. Lets make some Changes • All Reusable components can be changed • Will have immediate effect in the application – After redeployment of the library
  45. 45. Other Topic : Reuse in ADF BC • Declarative Model Driven functionality – Most Recently Used, UI Hints – List of Values, Model Driven Query Form • Entity Object Business Logic Group • View Criteria – Multiple faces on the same ViewObject • Shared Application Module – Reuse data across sessions
  46. 46. Summary • ADF Provides mechanisms for reuse • Initial investment • Payback time is later • Considerations: – Is it reusable ? – Will I reuse it ? • But also – Modularity – Maintainability – Increased Productivity
  47. 47. Luc Bors, AMIS, The Netherlands Follow me on : @lucb_