XCompose: An XML-based Component Composition Framework Naiyana Tansalarak and Kajal T. Claypool...

XCompose:An XML-based Component Composition Framework

Naiyana Tansalarak and Kajal T. Claypool

University of Massachusetts, LowellJuly 22nd, 2003

InWorkshop on Composition Languages (WCL) 2003

(conjunction with ECOOP 2003)Darmstadt, Germany

2

Introduction

Component-based Software Systems

– pre-fabricated components

– composition framework

Advantages:

– on-time development

– higher quality

– higher reliability

3

Goal of Composition Framework

New requirement

Asset

Specification

New technology

Extensible - tailor existing compositions

Flexible - plug-and-play

Re-usable - make compositions

available to all users

Correct - provide system-level guarantees

Portable - enable composition across

component models

4

Outline

• Previous Work

• Our Approach

• Discussion

5

Previous Work

• Piccola application = components + script

• Bean Markup Language (BML)

• Component Markup Language (CoML)

Flexibility

Extensibility

Reusability

Correctness

Portability

Piccola

BML/CoML

XCompose

6

Hypothesis

Complex Component Composition can

be broken down into a sequence of a

primitive composition operators glued

together by a simple language

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Paradigm

Components Application = +

Composition Language

Operators Composition Language = +

Glue Logic

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XCompose Basics

New requirement

Asset

Specification

New technology

Flexibility

Extensibility

Reusability

Correctness

Portability

Composition PatternsComposition Operators

Composition Templates

XDescriptors

Composition Contracts

Goals Ingredients

www.cs.uml.edu/~ntansala

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XCompose Basics

New requirement

Asset

Specification

New technology

Flexibility

Extensibility

Reusability

Correctness

Portability



XDescriptors


Goals Ingredients


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Primitive Operators

Primitive Composition Operators

• Conjunction mi mj • Sequence mi ; mj • Choice mi V mj

• Pipe mi | mj

• Loop mi*V

Primitive Manipulation Operators:• addAttribute• addMethod• invokeMethod• addComponent

11

Complex Operators

Complex Composition Operators

• Connection-oriented Composition

– addConnection

• Aggregation-based Composition

– addToContainer

Complex Manipulation Operators

• configureProperty

• addListener

• addEvent

• linkEvent

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XCompose Basics

New requirement

Asset

Specification

New technology

Flexibility

Extensibility

Reusability

Correctness

Portability



XDescriptors


Goals Ingredients


13

Composition Pattern

A sequence of composition operators

glued together by a simple language

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Example : Composition Pattern

ListMultiselector {

addComponent (“java.awt.List”, “list”);

addComponent (“java.awt.Multiselector”, “selector”);

addToContainer (“list”, “selector”);

linkEvent (“paint”, “list.paint”);

linkEvent (“select”, “selector.select”);

linkEvent (“deselect”, “selector.deselect”);

linkEvent (“close”, “selector.close; list.close”);

}

ListMultiselector

event(ListMultiselector) =

event (GUIList) U

event (Multiselector)

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Common Composition Pattern

ListMultiselector

event(ListMultiselector) =

event (GUIList) U

event (Multiselector)

GUIList

JFrame

FrameList

event(FrameList) =

event (JFrame) U

event (GUIList)

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XCompose Basics

New requirement

Asset

Specification

New technology

Flexibility

Extensibility

Reusability

Correctness

Portability



XDescriptors


Goals Ingredients


17

Composition Pattern Template

The parameterized and generalized

composition patterns.

18

Example: Composition Template

ListMultiselector {

addComponent (“java.awt.List”, “list”);

addComponent (“java.awt.Multiselector”,

“selector”);

addToContainer (“list”, “selector”);

linkEvent (“paint”, “list.paint”);

linkEvent (“select”, “selector.select”);

linkEvent (“deselect”, “selector.deselect”);

linkEvent (“close”, “selector.close; list.close”);

}

MergeMasterClient (master, client) {

addComponent (“$master”, “container”);

addComponent (“$client”, “part”);

addToContainer (“container”, “part”);

let $tmp = event (“container”) ∩ event(“part”)

forall $e Є event(“container”) and $e $tmp

linkEvent (“$e”, “container.$e”);

forall $e Є event(“part”) and $e $tmp

linkEvent (“$e”, “part.$e”);

forall $e Є $tmp

linkEvent (“$e”, “part.$e; container.$e”);

}

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Instantiation

MergeMasterClient ($master, $client)

GUIList, MultiSelector

ListMultiselector

JFrame, GUIList

GUIList

JFrame

FrameList

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XCompose Basics

New requirement

Asset

Specification

New technology

Flexibility

Extensibility

Reusability

Correctness

Portability



XDescriptors


Goals Ingredients


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XDescriptor

<class name=“GUIList”> <properties> </properties> <events> <event name=“”paint” refer=“”/> <event name=“”close” refer=“”/> </events> <methods> </methods> <composition> </composition></class>

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XDescriptor

<class name=“ListMultiselector”> <properties> </properties> <events> <event name=“”paint” refer=“list”/> <event name=“”select” refer=“selector”/> <event name=“”deselect” refer=“selector”/> <event name=“”close” refer=“selector;list”/> </events> <methods> </methods> <composition> <component name=“java.awt.List” id=“list”/>

<add id=“selector”/> </component> <component name=“java.awt.Multiselector” id=“selector”/> </composition></class>

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System Architecture

JavaBeans CORBA COM

XDescriptorWrapper

XComposeEngine

DeploymentEngine

XDescriptor

XDescriptorLibrary

GUIList

GUIList

XDescriptor

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System Architecture (con’t)

TemplateProcessor

CompositionTemplate Manager

uses

XCompose Engine

InstantiationTool

Composition Manager

PatternVerifier

uses

CompositionEditor

patternsOperators

TemplateLibrary

patternspatterns

XDescriptor

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Discussion ?

• What is the complete set of operators and their

semantics to provide flexibility and extensibility ?

• What extensions are needed to make XCompose

platform and component model independent ?

• Is XML the right model?

• What are the tradeoffs to achieve the five goals ?

• Are the five goals sufficient ? Are there any other

goals that need to be supported here ?

26

Questions ?

XCompose: An XML-based Component Composition Framework Naiyana Tansalarak and Kajal T. Claypool...

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