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DCI - Data, Context and Interaction @ Jug Genova April 2011

This document outlines an agenda for a presentation on Data, Context and Interaction (DCI). The agenda includes discussing two real world examples, the basic concepts of DCI, how to implement DCI, and some simple examples. DCI aims to improve the readability of object-oriented systems by giving system behavior first-class status and separating responsibilities for behavior and domain.

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DCI Data, Context and Interaction Fabrizio Giudici, Senior Java Architect Tidalwave s.a.s - fabrizio.giudici@tidalwave.it Wednesday, April 20, 2011 1
About the speaker DCI 2 Wednesday, April 20, 2011 2
About the speaker • Senior Software Architect, Mentor, Technical Writer • Fourteen years of Java experience (JSE, JEE, JME, etc...) • Sun partner since 1998, Oracle consultant since 2010 • Author of a number of open source projects • Speaker at JavaOne, Devoxx, Jazoon, JAX and other events • Member of the NetBeans Dream Team • Co-leader of JUG Milano • Java.Net blogger at http://www.java.net/blogs/fabriziogiudici DCI 2 Wednesday, April 20, 2011 2
Agenda DCI 3 Wednesday, April 20, 2011 3
Agenda • Two real world examples DCI 3 Wednesday, April 20, 2011 3
Agenda • Two real world examples • DCI - Basic concepts DCI 3 Wednesday, April 20, 2011 3
Agenda • Two real world examples • DCI - Basic concepts • DCI - How to implement? DCI 3 Wednesday, April 20, 2011 3
Agenda • Two real world examples • DCI - Basic concepts • DCI - How to implement? • Some simple examples DCI 3 Wednesday, April 20, 2011 3
Agenda • Two real world examples • DCI - Basic concepts • DCI - How to implement? • Some simple examples • Abstracting and sweetening DCI 3 Wednesday, April 20, 2011 3
Two real world examples Wednesday, April 20, 2011 4
Shameless Plug DCI 5 Wednesday, April 20, 2011 5
Shameless Plug • Exercises of Design - my design book... DCI 5 Wednesday, April 20, 2011 5
Shameless Plug • Exercises of Design - my design book... • Just started! DCI 5 Wednesday, April 20, 2011 5
Shameless Plug • Exercises of Design - my design book... • Just started! • http://exercisesofdesign.java.net DCI 5 Wednesday, April 20, 2011 5
The Observation API • A core component of blueBill Mobile • An application about recording bird observations • Designed with a high degree of abstraction DCI 6 Wednesday, April 20, 2011 6
The Observation API • A core component of blueBill Mobile • An application about recording bird observations • Designed with a high degree of abstraction DCI 6 Wednesday, April 20, 2011 6
The Observation API • A core component of blueBill Mobile • An application about recording bird observations • Designed with a high degree of abstraction DCI 6 Wednesday, April 20, 2011 6
DCI 7 Wednesday, April 20, 2011 7
The Taxonomy API • Models the taxonomy of a philogenetic tree • The standard way of biology for representing living beings species DCI 8 Wednesday, April 20, 2011 8
DCI 9 Wednesday, April 20, 2011 9
DCI - Basic Concepts Wednesday, April 20, 2011 10
Data, Context and Interaction DCI 11 Wednesday, April 20, 2011 11
Data, Context and Interaction • OOD best practice invented by Trygve Reenskaug DCI 11 Wednesday, April 20, 2011 11
Data, Context and Interaction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC DCI 11 Wednesday, April 20, 2011 11
Data, Context and Interaction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC • Seen as an evolution of MVC DCI 11 Wednesday, April 20, 2011 11
Data, Context and Interaction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC • Seen as an evolution of MVC • But it doesn’t replace it DCI 11 Wednesday, April 20, 2011 11
Data, Context and Interaction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC • Seen as an evolution of MVC • But it doesn’t replace it • It rather broadens the analysis scope DCI 11 Wednesday, April 20, 2011 11
Data, Context and Interaction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC • Seen as an evolution of MVC • But it doesn’t replace it • It rather broadens the analysis scope • http://www.artima.com/articles/dci_vision.html DCI 11 Wednesday, April 20, 2011 11
DCI - aims DCI 12 Wednesday, April 20, 2011 12
DCI - aims • Improve readability of a OO system DCI 12 Wednesday, April 20, 2011 12
DCI - aims • Improve readability of a OO system • Give system behaviour first-class status DCI 12 Wednesday, April 20, 2011 12
DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole DCI 12 Wednesday, April 20, 2011 12
DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole • Separate responsibilities for behaviour and domain DCI 12 Wednesday, April 20, 2011 12
DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole • Separate responsibilities for behaviour and domain • Behaviour: what the system does DCI 12 Wednesday, April 20, 2011 12
DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole • Separate responsibilities for behaviour and domain • Behaviour: what the system does • Domain: what the system is DCI 12 Wednesday, April 20, 2011 12
DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole • Separate responsibilities for behaviour and domain • Behaviour: what the system does • Domain: what the system is • Be close to people’s mental model DCI 12 Wednesday, April 20, 2011 12
DCI - Data DCI 13 Wednesday, April 20, 2011 13
DCI - Data • What the system is DCI 13 Wednesday, April 20, 2011 13
DCI - Data • What the system is • Relatively static with relations DCI 13 Wednesday, April 20, 2011 13
DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes DCI 13 Wednesday, April 20, 2011 13
DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes • Typically it includes persistence DCI 13 Wednesday, April 20, 2011 13
DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes • Typically it includes persistence • Comes from the mental model of system stakeholders DCI 13 Wednesday, April 20, 2011 13
DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes • Typically it includes persistence • Comes from the mental model of system stakeholders • Close to the “model” in MVC DCI 13 Wednesday, April 20, 2011 13
DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes • Typically it includes persistence • Comes from the mental model of system stakeholders • Close to the “model” in MVC • Example: BankAccount with increase(), decrease(); no deposit() DCI 13 Wednesday, April 20, 2011 13
DCI - Context (and Roles) DCI 14 Wednesday, April 20, 2011 14
DCI - Context (and Roles) • Associated to a use case, user story, scenario, or algorithm DCI 14 Wednesday, April 20, 2011 14
DCI - Context (and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario DCI 14 Wednesday, April 20, 2011 14
DCI - Context (and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles DCI 14 Wednesday, April 20, 2011 14
DCI - Context (and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles • Objects can have multiple roles at the same time DCI 14 Wednesday, April 20, 2011 14
DCI - Context (and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles • Objects can have multiple roles at the same time • Decompose the use case (etc...) into roles, not objects DCI 14 Wednesday, April 20, 2011 14
DCI - Context (and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles • Objects can have multiple roles at the same time • Decompose the use case (etc...) into roles, not objects • Contrast this with polymorphism and classic OO decomposition DCI 14 Wednesday, April 20, 2011 14
DCI - Context (and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles • Objects can have multiple roles at the same time • Decompose the use case (etc...) into roles, not objects • Contrast this with polymorphism and classic OO decomposition • Example: MoneyTransfer with SrcAccount and DestAccount DCI 14 Wednesday, April 20, 2011 14
Quick terminology note DCI 15 Wednesday, April 20, 2011 15
Quick terminology note • Methodless role: abstract role DCI 15 Wednesday, April 20, 2011 15
Quick terminology note • Methodless role: abstract role • Interface, abstract class DCI 15 Wednesday, April 20, 2011 15
Quick terminology note • Methodless role: abstract role • Interface, abstract class • Methodful role: concrete role DCI 15 Wednesday, April 20, 2011 15
Quick terminology note • Methodless role: abstract role • Interface, abstract class • Methodful role: concrete role • Regular class DCI 15 Wednesday, April 20, 2011 15
DCI - Interaction DCI 16 Wednesday, April 20, 2011 16
DCI - Interaction • What the system does DCI 16 Wednesday, April 20, 2011 16
DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects DCI 16 Wednesday, April 20, 2011 16
DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects • Roles are bound in different ways for each context DCI 16 Wednesday, April 20, 2011 16
DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects • Roles are bound in different ways for each context • Roles should be generic DCI 16 Wednesday, April 20, 2011 16
DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects • Roles are bound in different ways for each context • Roles should be generic • Roles life cycle is likely to be bound to a given interaction DCI 16 Wednesday, April 20, 2011 16
DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects • Roles are bound in different ways for each context • Roles should be generic • Roles life cycle is likely to be bound to a given interaction • Interaction should be explicit given role nature, rather than emergent as in (agile) OOD DCI 16 Wednesday, April 20, 2011 16
DCI - Execution Model DCI 17 Wednesday, April 20, 2011 17
DCI - Execution Model • The Context finds object participants DCI 17 Wednesday, April 20, 2011 17
DCI - Execution Model • The Context finds object participants • Then, it assigns (injects?) roles to them DCI 17 Wednesday, April 20, 2011 17
DCI - Execution Model • The Context finds object participants • Then, it assigns (injects?) roles to them • Roles find each other by type (methodless) DCI 17 Wednesday, April 20, 2011 17
DCI - Execution Model • The Context finds object participants • Then, it assigns (injects?) roles to them • Roles find each other by type (methodless) • What about static languages and designs? DCI 17 Wednesday, April 20, 2011 17
DCI - Execution Model • The Context finds object participants • Then, it assigns (injects?) roles to them • Roles find each other by type (methodless) • What about static languages and designs? • Then, it invokes a method on the first role DCI 17 Wednesday, April 20, 2011 17
DCI - Execution Model • The Context finds object participants • Then, it assigns (injects?) roles to them • Roles find each other by type (methodless) • What about static languages and designs? • Then, it invokes a method on the first role • Interaction goes on among other roles DCI 17 Wednesday, April 20, 2011 17
DCI - How to implement? Wednesday, April 20, 2011 18
Some design issues DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic • Traits, Mix-ins DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles • Partly solved by the clear separation object (stateful) / role (stateless) DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles • Partly solved by the clear separation object (stateful) / role (stateless) • What about equals() / hashcode()? DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles • Partly solved by the clear separation object (stateful) / role (stateless) • What about equals() / hashcode()? • Problem: anemic objects DCI 19 Wednesday, April 20, 2011 19
Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles • Partly solved by the clear separation object (stateful) / role (stateless) • What about equals() / hashcode()? • Problem: anemic objects • Really a problem in this perspective? DCI 19 Wednesday, April 20, 2011 19
Designing with DCI DCI 20 Wednesday, April 20, 2011 20
Designing with DCI • First, acknowledge that DCI is a best practice DCI 20 Wednesday, April 20, 2011 20
Designing with DCI • First, acknowledge that DCI is a best practice • Some languages can fit better than others DCI 20 Wednesday, April 20, 2011 20
Designing with DCI • First, acknowledge that DCI is a best practice • Some languages can fit better than others • Frameworks might help... but they force a new nature DCI 20 Wednesday, April 20, 2011 20
Designing with DCI • First, acknowledge that DCI is a best practice • Some languages can fit better than others • Frameworks might help... but they force a new nature • My point: DCI must be addressed in design DCI 20 Wednesday, April 20, 2011 20
Some UI-oriented examples Wednesday, April 20, 2011 21
NodesExample 1 • Static role implementation • Introduce some generic, (G)UI oriented roles • NetBeans Platform’s Lookup based implementation DCI 22 Wednesday, April 20, 2011 22
NodesExample 2 • Dynamically replacing roles with decorators DCI 23 Wednesday, April 20, 2011 23
NodesExample 4 • Adding contextual Actions and ToolTips DCI 24 Wednesday, April 20, 2011 24
NodesExample 5 • Removing UI dependencied DCI 25 Wednesday, April 20, 2011 25
NodesExample 6 • Injecting roles from the Context DCI 26 Wednesday, April 20, 2011 26
NodesExample 7 • Injecting Roles in function of the Context DCI 27 Wednesday, April 20, 2011 27
Abstracting and sweetening Wednesday, April 20, 2011 28
Abstracting and sweetening • Would be nice to be technology independent • Would be nice to have some syntactic sugar DCI 29 Wednesday, April 20, 2011 29
as() DCI 30 Wednesday, April 20, 2011 30
as() • From Role role = object.getLookup().lookup(Role.class) ... DCI 30 Wednesday, April 20, 2011 30
as() • From Role role = object.getLookup().lookup(Role.class) ... • ... to Role role = object.as(Role); DCI 30 Wednesday, April 20, 2011 30
as() • From Role role = object.getLookup().lookup(Role.class) ... • ... to Role role = object.as(Role); • As a wrapper around Lookup DCI 30 Wednesday, April 20, 2011 30
as() • From Role role = object.getLookup().lookup(Role.class) ... • ... to Role role = object.as(Role); • As a wrapper around Lookup • With annotations and Lombok DCI 30 Wednesday, April 20, 2011 30
as() • From Role role = object.getLookup().lookup(Role.class) ... • ... to Role role = object.as(Role); • As a wrapper around Lookup • @AsCapable With annotations and Lombok public class MyObject { @Role private Role1 r1 = new Role1(); @Role // lazy private Provider<Role> r2 = ...; DCI } 30 Wednesday, April 20, 2011 30
Q &A • Question Time DCI 31 Wednesday, April 20, 2011 31

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DCI - Data, Context and Interaction @ Jug Genova April 2011

  • 1.
    DCI Data, Context and Interaction Fabrizio Giudici, Senior Java Architect Tidalwave s.a.s - fabrizio.giudici@tidalwave.it Wednesday, April 20, 2011 1
  • 2.
    About the speaker DCI 2 Wednesday, April 20, 2011 2
  • 3.
    About the speaker • Senior Software Architect, Mentor, Technical Writer • Fourteen years of Java experience (JSE, JEE, JME, etc...) • Sun partner since 1998, Oracle consultant since 2010 • Author of a number of open source projects • Speaker at JavaOne, Devoxx, Jazoon, JAX and other events • Member of the NetBeans Dream Team • Co-leader of JUG Milano • Java.Net blogger at http://www.java.net/blogs/fabriziogiudici DCI 2 Wednesday, April 20, 2011 2
  • 4.
    Agenda DCI 3 Wednesday, April 20, 2011 3
  • 5.
    Agenda • Two real world examples DCI 3 Wednesday, April 20, 2011 3
  • 6.
    Agenda • Two real world examples • DCI - Basic concepts DCI 3 Wednesday, April 20, 2011 3
  • 7.
    Agenda • Two real world examples • DCI - Basic concepts • DCI - How to implement? DCI 3 Wednesday, April 20, 2011 3
  • 8.
    Agenda • Two real world examples • DCI - Basic concepts • DCI - How to implement? • Some simple examples DCI 3 Wednesday, April 20, 2011 3
  • 9.
    Agenda • Two real world examples • DCI - Basic concepts • DCI - How to implement? • Some simple examples • Abstracting and sweetening DCI 3 Wednesday, April 20, 2011 3
  • 10.
    Two real world examples Wednesday, April 20, 2011 4
  • 11.
    Shameless Plug DCI 5 Wednesday, April 20, 2011 5
  • 12.
    Shameless Plug • Exercises of Design - my design book... DCI 5 Wednesday, April 20, 2011 5
  • 13.
    Shameless Plug • Exercises of Design - my design book... • Just started! DCI 5 Wednesday, April 20, 2011 5
  • 14.
    Shameless Plug • Exercises of Design - my design book... • Just started! • http://exercisesofdesign.java.net DCI 5 Wednesday, April 20, 2011 5
  • 15.
    The Observation API • A core component of blueBill Mobile • An application about recording bird observations • Designed with a high degree of abstraction DCI 6 Wednesday, April 20, 2011 6
  • 16.
    The Observation API • A core component of blueBill Mobile • An application about recording bird observations • Designed with a high degree of abstraction DCI 6 Wednesday, April 20, 2011 6
  • 17.
    The Observation API • A core component of blueBill Mobile • An application about recording bird observations • Designed with a high degree of abstraction DCI 6 Wednesday, April 20, 2011 6
  • 18.
    DCI 7 Wednesday, April 20, 2011 7
  • 19.
    The Taxonomy API • Models the taxonomy of a philogenetic tree • The standard way of biology for representing living beings species DCI 8 Wednesday, April 20, 2011 8
  • 20.
    DCI 9 Wednesday, April 20, 2011 9
  • 21.
    DCI - BasicConcepts Wednesday, April 20, 2011 10
  • 22.
    Data, Context andInteraction DCI 11 Wednesday, April 20, 2011 11
  • 23.
    Data, Context andInteraction • OOD best practice invented by Trygve Reenskaug DCI 11 Wednesday, April 20, 2011 11
  • 24.
    Data, Context andInteraction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC DCI 11 Wednesday, April 20, 2011 11
  • 25.
    Data, Context andInteraction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC • Seen as an evolution of MVC DCI 11 Wednesday, April 20, 2011 11
  • 26.
    Data, Context andInteraction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC • Seen as an evolution of MVC • But it doesn’t replace it DCI 11 Wednesday, April 20, 2011 11
  • 27.
    Data, Context andInteraction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC • Seen as an evolution of MVC • But it doesn’t replace it • It rather broadens the analysis scope DCI 11 Wednesday, April 20, 2011 11
  • 28.
    Data, Context andInteraction • OOD best practice invented by Trygve Reenskaug • The formalizer of MVC • Seen as an evolution of MVC • But it doesn’t replace it • It rather broadens the analysis scope • http://www.artima.com/articles/dci_vision.html DCI 11 Wednesday, April 20, 2011 11
  • 29.
    DCI - aims DCI 12 Wednesday, April 20, 2011 12
  • 30.
    DCI - aims • Improve readability of a OO system DCI 12 Wednesday, April 20, 2011 12
  • 31.
    DCI - aims • Improve readability of a OO system • Give system behaviour first-class status DCI 12 Wednesday, April 20, 2011 12
  • 32.
    DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole DCI 12 Wednesday, April 20, 2011 12
  • 33.
    DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole • Separate responsibilities for behaviour and domain DCI 12 Wednesday, April 20, 2011 12
  • 34.
    DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole • Separate responsibilities for behaviour and domain • Behaviour: what the system does DCI 12 Wednesday, April 20, 2011 12
  • 35.
    DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole • Separate responsibilities for behaviour and domain • Behaviour: what the system does • Domain: what the system is DCI 12 Wednesday, April 20, 2011 12
  • 36.
    DCI - aims • Improve readability of a OO system • Give system behaviour first-class status • Recover readability of system properties on the whole • Separate responsibilities for behaviour and domain • Behaviour: what the system does • Domain: what the system is • Be close to people’s mental model DCI 12 Wednesday, April 20, 2011 12
  • 37.
    DCI - Data DCI 13 Wednesday, April 20, 2011 13
  • 38.
    DCI - Data • What the system is DCI 13 Wednesday, April 20, 2011 13
  • 39.
    DCI - Data • What the system is • Relatively static with relations DCI 13 Wednesday, April 20, 2011 13
  • 40.
    DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes DCI 13 Wednesday, April 20, 2011 13
  • 41.
    DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes • Typically it includes persistence DCI 13 Wednesday, April 20, 2011 13
  • 42.
    DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes • Typically it includes persistence • Comes from the mental model of system stakeholders DCI 13 Wednesday, April 20, 2011 13
  • 43.
    DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes • Typically it includes persistence • Comes from the mental model of system stakeholders • Close to the “model” in MVC DCI 13 Wednesday, April 20, 2011 13
  • 44.
    DCI - Data • What the system is • Relatively static with relations • Domain structure implemented with “conventional” classes • Typically it includes persistence • Comes from the mental model of system stakeholders • Close to the “model” in MVC • Example: BankAccount with increase(), decrease(); no deposit() DCI 13 Wednesday, April 20, 2011 13
  • 45.
    DCI - Context(and Roles) DCI 14 Wednesday, April 20, 2011 14
  • 46.
    DCI - Context(and Roles) • Associated to a use case, user story, scenario, or algorithm DCI 14 Wednesday, April 20, 2011 14
  • 47.
    DCI - Context(and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario DCI 14 Wednesday, April 20, 2011 14
  • 48.
    DCI - Context(and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles DCI 14 Wednesday, April 20, 2011 14
  • 49.
    DCI - Context(and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles • Objects can have multiple roles at the same time DCI 14 Wednesday, April 20, 2011 14
  • 50.
    DCI - Context(and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles • Objects can have multiple roles at the same time • Decompose the use case (etc...) into roles, not objects DCI 14 Wednesday, April 20, 2011 14
  • 51.
    DCI - Context(and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles • Objects can have multiple roles at the same time • Decompose the use case (etc...) into roles, not objects • Contrast this with polymorphism and classic OO decomposition DCI 14 Wednesday, April 20, 2011 14
  • 52.
    DCI - Context(and Roles) • Associated to a use case, user story, scenario, or algorithm • Identifies objects participating in a scenario • Assign to each object one or more stateless roles • Objects can have multiple roles at the same time • Decompose the use case (etc...) into roles, not objects • Contrast this with polymorphism and classic OO decomposition • Example: MoneyTransfer with SrcAccount and DestAccount DCI 14 Wednesday, April 20, 2011 14
  • 53.
    Quick terminology note DCI 15 Wednesday, April 20, 2011 15
  • 54.
    Quick terminology note • Methodless role: abstract role DCI 15 Wednesday, April 20, 2011 15
  • 55.
    Quick terminology note • Methodless role: abstract role • Interface, abstract class DCI 15 Wednesday, April 20, 2011 15
  • 56.
    Quick terminology note • Methodless role: abstract role • Interface, abstract class • Methodful role: concrete role DCI 15 Wednesday, April 20, 2011 15
  • 57.
    Quick terminology note • Methodless role: abstract role • Interface, abstract class • Methodful role: concrete role • Regular class DCI 15 Wednesday, April 20, 2011 15
  • 58.
    DCI - Interaction DCI 16 Wednesday, April 20, 2011 16
  • 59.
    DCI - Interaction • What the system does DCI 16 Wednesday, April 20, 2011 16
  • 60.
    DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects DCI 16 Wednesday, April 20, 2011 16
  • 61.
    DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects • Roles are bound in different ways for each context DCI 16 Wednesday, April 20, 2011 16
  • 62.
    DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects • Roles are bound in different ways for each context • Roles should be generic DCI 16 Wednesday, April 20, 2011 16
  • 63.
    DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects • Roles are bound in different ways for each context • Roles should be generic • Roles life cycle is likely to be bound to a given interaction DCI 16 Wednesday, April 20, 2011 16
  • 64.
    DCI - Interaction • What the system does • Occurs among roles, which act as adapters to objects • Roles are bound in different ways for each context • Roles should be generic • Roles life cycle is likely to be bound to a given interaction • Interaction should be explicit given role nature, rather than emergent as in (agile) OOD DCI 16 Wednesday, April 20, 2011 16
  • 65.
    DCI - ExecutionModel DCI 17 Wednesday, April 20, 2011 17
  • 66.
    DCI - ExecutionModel • The Context finds object participants DCI 17 Wednesday, April 20, 2011 17
  • 67.
    DCI - ExecutionModel • The Context finds object participants • Then, it assigns (injects?) roles to them DCI 17 Wednesday, April 20, 2011 17
  • 68.
    DCI - ExecutionModel • The Context finds object participants • Then, it assigns (injects?) roles to them • Roles find each other by type (methodless) DCI 17 Wednesday, April 20, 2011 17
  • 69.
    DCI - ExecutionModel • The Context finds object participants • Then, it assigns (injects?) roles to them • Roles find each other by type (methodless) • What about static languages and designs? DCI 17 Wednesday, April 20, 2011 17
  • 70.
    DCI - ExecutionModel • The Context finds object participants • Then, it assigns (injects?) roles to them • Roles find each other by type (methodless) • What about static languages and designs? • Then, it invokes a method on the first role DCI 17 Wednesday, April 20, 2011 17
  • 71.
    DCI - ExecutionModel • The Context finds object participants • Then, it assigns (injects?) roles to them • Roles find each other by type (methodless) • What about static languages and designs? • Then, it invokes a method on the first role • Interaction goes on among other roles DCI 17 Wednesday, April 20, 2011 17
  • 72.
    DCI - Howto implement? Wednesday, April 20, 2011 18
  • 73.
    Some design issues DCI 19 Wednesday, April 20, 2011 19
  • 74.
    Some design issues • Static vs dynamic DCI 19 Wednesday, April 20, 2011 19
  • 75.
    Some design issues • Static vs dynamic • Traits, Mix-ins DCI 19 Wednesday, April 20, 2011 19
  • 76.
    Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) DCI 19 Wednesday, April 20, 2011 19
  • 77.
    Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia DCI 19 Wednesday, April 20, 2011 19
  • 78.
    Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles DCI 19 Wednesday, April 20, 2011 19
  • 79.
    Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles • Partly solved by the clear separation object (stateful) / role (stateless) DCI 19 Wednesday, April 20, 2011 19
  • 80.
    Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles • Partly solved by the clear separation object (stateful) / role (stateless) • What about equals() / hashcode()? DCI 19 Wednesday, April 20, 2011 19
  • 81.
    Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles • Partly solved by the clear separation object (stateful) / role (stateless) • What about equals() / hashcode()? • Problem: anemic objects DCI 19 Wednesday, April 20, 2011 19
  • 82.
    Some design issues • Static vs dynamic • Traits, Mix-ins • AOP, annotations (e.g. Qi4J) • Problems: schizophrenia • Which is the identity of an object that becomes a cluster of roles • Partly solved by the clear separation object (stateful) / role (stateless) • What about equals() / hashcode()? • Problem: anemic objects • Really a problem in this perspective? DCI 19 Wednesday, April 20, 2011 19
  • 83.
    Designing with DCI DCI 20 Wednesday, April 20, 2011 20
  • 84.
    Designing with DCI • First, acknowledge that DCI is a best practice DCI 20 Wednesday, April 20, 2011 20
  • 85.
    Designing with DCI • First, acknowledge that DCI is a best practice • Some languages can fit better than others DCI 20 Wednesday, April 20, 2011 20
  • 86.
    Designing with DCI • First, acknowledge that DCI is a best practice • Some languages can fit better than others • Frameworks might help... but they force a new nature DCI 20 Wednesday, April 20, 2011 20
  • 87.
    Designing with DCI • First, acknowledge that DCI is a best practice • Some languages can fit better than others • Frameworks might help... but they force a new nature • My point: DCI must be addressed in design DCI 20 Wednesday, April 20, 2011 20
  • 88.
    Some UI-oriented examples Wednesday, April 20, 2011 21
  • 89.
    NodesExample 1 • Static role implementation • Introduce some generic, (G)UI oriented roles • NetBeans Platform’s Lookup based implementation DCI 22 Wednesday, April 20, 2011 22
  • 90.
    NodesExample 2 • Dynamically replacing roles with decorators DCI 23 Wednesday, April 20, 2011 23
  • 91.
    NodesExample 4 • Adding contextual Actions and ToolTips DCI 24 Wednesday, April 20, 2011 24
  • 92.
    NodesExample 5 • Removing UI dependencied DCI 25 Wednesday, April 20, 2011 25
  • 93.
    NodesExample 6 • Injecting roles from the Context DCI 26 Wednesday, April 20, 2011 26
  • 94.
    NodesExample 7 • Injecting Roles in function of the Context DCI 27 Wednesday, April 20, 2011 27
  • 95.
    Abstracting and sweetening Wednesday, April 20, 2011 28
  • 96.
    Abstracting and sweetening • Would be nice to be technology independent • Would be nice to have some syntactic sugar DCI 29 Wednesday, April 20, 2011 29
  • 97.
    as() DCI 30 Wednesday, April 20, 2011 30
  • 98.
    as() • From Role role = object.getLookup().lookup(Role.class) ... DCI 30 Wednesday, April 20, 2011 30
  • 99.
    as() • From Role role = object.getLookup().lookup(Role.class) ... • ... to Role role = object.as(Role); DCI 30 Wednesday, April 20, 2011 30
  • 100.
    as() • From Role role = object.getLookup().lookup(Role.class) ... • ... to Role role = object.as(Role); • As a wrapper around Lookup DCI 30 Wednesday, April 20, 2011 30
  • 101.
    as() • From Role role = object.getLookup().lookup(Role.class) ... • ... to Role role = object.as(Role); • As a wrapper around Lookup • With annotations and Lombok DCI 30 Wednesday, April 20, 2011 30
  • 102.
    as() • From Role role = object.getLookup().lookup(Role.class) ... • ... to Role role = object.as(Role); • As a wrapper around Lookup • @AsCapable With annotations and Lombok public class MyObject { @Role private Role1 r1 = new Role1(); @Role // lazy private Provider<Role> r2 = ...; DCI } 30 Wednesday, April 20, 2011 30
  • 103.
    Q &A • Question Time DCI 31 Wednesday, April 20, 2011 31