oracle adf architecture tv - design - task flow communication pattern
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1 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
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Real World ADF Design & Architecture Principles Task Flow & Region Communication Patterns
ORACLE PRODUCT
LOGO
15th Feb 2013 v1.0
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Learning Objectives
• At the end of this module you should be able to:
– Understand different patterns of ADF region interaction – Be able to choose the right pattern to implement for a problem – Understand the dos and don’ts of task flow communication
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Program Agenda
• Task Flow Call Options • Region Interaction Recipes • Contextual Events • Exercises
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Task Flow Communication Bounded Task Flow Call Options
Bounded Task Flow
Region
Task Flow Call Activity
displayed in
navigate to
URL GET Request navigate to
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Task Flow Communication Call Activity
Task Flow
Task Flow Call Activity navigate to
provision Input Parameter Input Parameter Input Parameter
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Task Flow Communication Call Activity
Task Flow
Task Flow Call Activity return control to
process
Return Value Return Value
Return Activity
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Task Flow Communication ADF Region
Shared Data Control
Task Flow provision
Input Parameter Input Parameter Input Parameter
Region Parent View
Task Flow Binding
refresh
Parent View PageDef
get RegionModel
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But where is the return value in ADF regions?
Exercise
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Program Agenda
• Task Flow Call Options • Region Interaction Recipes • Contextual Events • Exercises
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Example
Region 1
Region 2
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Region Interaction
• Shared Data Control • Input Parameters
– Parameter changes – JavaBean instance references
• ADF Region events • Contextual events
Establishing Communication
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Secret of Oracle ADF Rockstar Programmers
Often there is no single solution to a problem. Use case matters.
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Parent-to-Region
• Master-detail synchronization between parent view and content shown in region
• Parent view passing data to child region for further processing – Embedded wizard use case
• Parent view triggering navigation in region – Generic CRUD flow – Content switcher to display different views for a set of data
Usecase
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Region-to-Parent
• Region to return value to parent view at end of task flow processing – Region "exit" use case
• Region method call to call behavior on parent view – Dynamic Tab Shell Template use case
• Navigate parent view in response to region change • Change dynamic task flow configuration from region
Usecase
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Region-to-Region
• Master-Detail behavior • Region causing navigation in another • Data passing
Usecase
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Program Agenda
• Task Flow Call Options • Region Interaction Recipes
– Shared Data Control – Input Parameter – Region Events – Other
• Contextual Events • Exercises
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Parent-to-Region Master-Detail Behavior – Shared DC
Task Flow
af:region
Parent View
View <file>.jsff
Next Previous Administration PPR
1.
4.
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Parent-to-Region Master-Detail Behavior – Shared DC
Task Flow
af:region
Parent View
View <file>.jsff
<file>PageDef.xml
dependentEmployees Iterator
<file>PageDef.xml
allDepartmentsIterator
Next Previous Administration change row currency
PPR
1.
2.
4.
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Parent-to-Region Master-Detail Behavior – Shared DC
Task Flow
af:region
Parent View
View <file>.jsff
<file>PageDef.xml
dependentEmployees Iterator
<file>PageDef.xml
allDepartmentsIterator
Next Previous Administration change row currency
change row currency
PPR
update
1.
2.
3.
4.
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Parent-to-Region Master-Detail Behavior – Isolated DC
Task Flow
af:region
Parent View
View <file>.jsff
Next Previous Administration PPR
1.
4.
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Parent-to-Region Master-Detail Behavior – Isolated DC
Task Flow
af:region
Parent View
View <file>.jsff
<file>PageDef.xml
dependentEmployees Iterator
Data Control Layer
<file>PageDef.xml
allDepartmentsIterator
Next Previous Administration change row currency
PPR
Data Control Layer
taskFlowBinding
DepartmentName
detect change parameter value
Input Parameter
query
1.
2.
3.
4.
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Program Agenda
• Task Flow Call Options • Region Interaction Recipes
– Shared Data Control – Input Parameter – Region Events – Other
• Contextual Events • Exercises
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Parent-to-Region Common Usecase: Navigate to Specific View in Region
Task Flow
af:region
Input Parameter
Parent Flow
control flow case 1
control flow case 2 view1
view2
view3
view3 Show View 3 On Click
PPR
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Region-to-Parent Bean Reference Injection
Bounded Task Flow
af:region
Input Parameter
Insert References to Parent View API
Managed Bean
Parent Task Flow (unbounded or bounded)
#{viewScope.ManagedBean}
Managed Bean
invokes method on caller
reference saved in
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Region-to-Parent: Chaperone in Action Usecase: Self closing regions in tabs
Bounded Task Flow
af:region
Managed Bean
Parent View Dynamic Tab Shell
Managed Bean View Scope
Input Parameter
View1 View2 Return Activity
Method Activity
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Region-to-Parent: Chaperone in Action Usecase: Self closing regions in tabs
Bounded Task Flow
af:region
Managed Bean
Parent View Dynamic Tab Shell
Managed Bean View Scope
View1 View2 Return Activity
Method Activity
Invoke method on
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Region-to-Parent: Chaperone in Action Usecase: Self closing regions in tabs
Bounded Task Flow
af:region
Managed Bean
Parent View Dynamic Tab Shell
Managed Bean View Scope
View1 View2 Return Activity
Method Activity
Invoke method on
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Region-to-Parent: Chaperone in Action Usecase: Self closing regions in tabs
Bounded Task Flow
af:region
Managed Bean
Parent View Dynamic Tab Shell
Managed Bean View Scope
View1 View2 Return Activity
Method Activity
Invoke method on
close tab
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Program Agenda
• Task Flow Call Options • Region Interaction Recipes
– Shared Data Control – Input Parameter – Region Events – Other
• Contextual Events • Exercises
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Region-to-Parent Navigate Parent View : RegionNavigationListener
af:region
Shopping Cart View Checkout View
checkOut
Task Flow
View1 View2 Return Activity
"view1" "view2" null
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Region-to-Parent Navigate Parent View : RegionNavigationListener
af:region
Shopping Cart View Checkout View
checkOut
Task Flow
View1 View2 Return Activity
"view1" "view2" null
?
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Region-to-Parent Navigate Parent View : RegionNavigationListener
af:region
Shopping Cart View Checkout View
checkOut
Task Flow
View1 View2 Return Activity
RegionNavigation Listener
If(viewId == null){ //navigate to //checkout }
"view1" "view2" null
Managed Bean
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Secret of Oracle ADF Rockstar Programmers
The Region Navigation Listener listens for what happens in a region not for what happens to a region
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Parent-to-Region
• Method of the af:region component – RichRegion
• Invokes an ActionEvent as if it was queued from a command component inside a region – Does not require the ADF region to refresh – Used for navigating between activities
• Control flow cases are discoverable
Navigate Region: queueActionEventInRegion
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Parent-to-Region
• Region capabilities are used by a page to identify the available navigation cases for a view displayed in a region
Determine Region Capabilities in EL
#{bindings.[regionId].regionModel.capabilities['outcome']}
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Parent-to-Region
• Determine Region Capabilities in Java
//backing bean with region component binding RichRegion region = this.getEmpRegion(); RegionModel model = region.getRegionModel(); Set<String> capabilities = model.getCapabilities(); ...
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Parent-to-Region Navigate Region: QueueActionEventInRegion
af:region
Parent View
Task Flow
View2
View3
View4 View5
toView2 toView5
View1
Managed Bean
Handle Navigation
RichRegion region = ... region.queueActionEventInRegion(...)
Press to Navigate
toView1
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Program Agenda
• Task Flow Call Options • Region Interaction Recipes
– Shared Data Control – Input Parameter – Region Events – Other
• Contextual Events • Exercises
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Region-to-Parent Navigate Parent View : Parent Activity
af:region
Shopping Cart View
CheckoutView
checkout
Task Flow
View1 View2 FailView
Task Flow
checkoutCallFailed
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Region-to-Parent Navigate Parent View : Parent Activity
af:region
Shopping Cart View
CheckoutView
checkout
Task Flow
View1 View2 FailView
Task Flow
checkoutCallFailed
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Region-to-Parent Navigate Parent View : Parent Activity
af:region
Shopping Cart View
CheckoutView
checkout
Task Flow
View1 View2 FailView
Task Flow
checkoutCallFailed
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Program Agenda
• Task Flow Call Options • Region Interaction Recipes
– Shared Data Control – Input Parameter – Region Events – Other
• Contextual Events • Exercises
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About Contextual Events
• Mechanism on the ADF binding layer for creating loosely coupled publish and subscribe event models
• Events may carry a data payload – Payload does not have to be a single simple scalar type but can be a
complex object
• Require fragment based task flows embedded within page regions • Task flows with event producer and consumers can be saved in ADF
libraries
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Contextual Events #1 Parent View
ParentViewPageDef
View Port View Port
Region 1 Region 2 ViewPageDef ViewPageDef
1 2
Event Map
Raise Event
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Parent View
ParentViewPageDef
View Port View Port
Region 1 Region 2 ViewPageDef ViewPageDef
Contextual Events #2
2 1
Event Map
Raise Event
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Parent View
ParentViewPageDef
View Port View Port
Region 1 Region 2 ViewPageDef ViewPageDef
Region 3
View Port
Contextual Events #3
1
2 3 Event Map
Raise Event
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Contextual Events
• Discoverability – Event producer and event receiver
• Documentation • Event payload
– What type of object is it? – What is in a payload?
• Developer "skill-up"
Challenges
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Program Agenda
• Task Flow Call Options • Region Interaction Recipes
– Shared Data Control – Input Parameter – Region Events – Other
• Contextual Events • Exercises
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Exercise #1
• The corporate architecture board is asked to suggest a solution for implementing master-detail behavior between two regions
• The application requirement is to coodinate the content displayed in the region such that one shows customer information and the other the selected customer's orders
• Further the requirement is that the view shows the master-detail behavior upon its initial rendering
• Changing the customer displayed in the parent (customer) region should immediately show the associated orders is response
Parent-Child Relationship Between Regions
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Exercise #1 Parent-Child Relationship Between Regions
Parent View
Customer View Customer - Orders View
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Exercise #2
• The requirement is for a task flow in a region to be able to hide / show components in the parent view
• The use case that needs to be implemented is to conditionally hide / show (default) a panel accordion
Help the Team
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Exercise #2 Hide/Show Components From a Region
Parent View
Region Customer
Orders Pending Shipments
Payments
Conditionally Hide&Show Accordion
Questions?
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Conclusion
• Keep it simple! Contextual events is powerful but not needed in many cases
• Don't make any assumption in a task flow about the environment the task flow executes in and how it is called
• Document task flow requirements for input parameters and return values
• Use task flow templates
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Further Reading
• ADF Region Interaction Functional Pattern – http://www.oracle.com/technetwork/developer-tools/adf/adfregioninteraction-155145.html
• Contextual Events Introduction – http://www.oracle.com/technetwork/issue-archive/2011/11-may/o31adf-352561.html
• Contextual Events: Callback pattern – http://www.oracle.com/technetwork/developer-tools/adf/learnmore/
regionpayloadcallbackpattern-1865094.pdf
• Master- commander: reusable contextual event solution – http://www.oracle.com/technetwork/issue-archive/2012/12-nov/o62adf-1867716.html
• Parent view initializing region navigation – http://www.oracle.com/technetwork/developer-tools/adf/learnmore/
externaltrainnavigationpattern-1845645.pdf
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