a template-based model transformation approach using a simplified hierarchical metamodel ph.d...
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A Template-Based Model Transformation Approach Using A Simplified Hierarchical Metamodel
Ph.D DissertationHongming LiuDePaul University
Agenda
Introduction Motivation HRMT Approach Case Study: HIMS Related Work and Evaluation Contributions
MDE
Using models to direct the course of understanding, design, construction, deployment, operation, maintenance and modification.
Transform abstract model into system implementation
Benefits of MDE
Model Transformation
A core concept to support MDE Transform a Platform Independent Model(PIM)
to Platform Specific Model(PSM) A model transformer is similar to a compiler Transformation requires a clear understanding of
the abstract syntax and semantics of both the source models and target models
Model Transformation Overview
RelationalPSM
EJB ComponentPSM
SQL Source Code
Java SourceCode
Platform Independent Model(PIM)
.NETPSM
C# SourceCode
Transformation:PIM -> Relational
Transformation:PIM -> EJB Component
Transformation:PIM -> .NET PSM
Transformation:Code Generation
Transformation:Code Generation
Transformation:Code Generation
Relational Template
EJB Template
.NET Template
State of the Art UML as the de facto modeling language
UML 2.2Object Constrain Language(OCL)UML 3.0?
MDA initiative of OMGModel Object Facility(MOF)Query/View/Transformation(QVT)
MDE Obstacles
Problems of UML and OCL Large and complex Inconsistent Loose semantics Difficult syntax of OCL
Inadequate tools support Lack of effective transformation mechanism
Proposed Approach
A model transformations frameworkBased on ZOOM notationUse Hierarchical Relational Metamodel(HRM)Template based transformationAims to provide a simple, effective, and
practical way to define model transformations
HRMT Approach
HRMT Approach
Source Model Representation Hierarchical Relational Metamodel Transformation Template Transformation Control Algorithm Post Processing
Hierarchical Relational Metamodel
A Hierarchical Relational Metamodel
HRM = (N, C, R)
N a set of nodes: N = {n1, n2, ... ni }
C a relation on N X N, which forms a tree structure that has one root and no unconnected nodes.
R a set of relation on N X N
HRM Example
Model Transformation Rules
A transformation rule set R = {r1, r2, r3... rn} a set of model transformation rules
A transformation rule r = (P --> Tpre, Tpost) P: pattern to select the elements of source model Tpre: mapping before traversing children of selected element Tpost: mapping after traversing children of selected element
Transformation Control Algorithm
Transformation Process
A
attrA1: Type
B
attrB1: TypeattrB2: Type
z
C
attrC1: TypeattrC2: Type
D
attrD1: Type
x
y
role2role1
Transformation Process
Class A
Attribute attrA1
ClassDiagram
Class B
Class C
Class D
Attribute attrB1
Attribute attrB2
Attribute attrC1
Attribute attrC2
Attribute attrD1
Relation Nodex Ay A
superClass
Relation Nodex Cy D
subClass
LeftAssociationEnd
RightAssociationEnd
Relation Nodez A
Relation Nodez BRelationships
Transformation Process
Development of Transformation
CSL Roster Example Basic Classes Classes with associations Generation of EJB Entities Generation of comprehensive EJB
applications
CSL Roster Example
Case Study: HIMS
Hospital Information Management System Electronic Healthcare Record Functional Requirement Non-Functional Requirement
HISM
@tablestruct MedicalDataTemplate { int id; String desc; String SecurityLevel; String format; String attachment;}
<Rule match="Struct"> <Pre> <![CDATA[ <File name="view${name}.aspx"> <%@ Page Language="C#" %>...Healthcare Information Management System<asp:GridView id="ctrlDataGrid" runat="server"... </asp:GridView><asp:SqlDataSource ID="ctrlDataSource" runat="server"ProviderName="System.Data.OleDb"ConnectionString=..."/>
HISM<%@ Page Language="C#" %><html xmlns="http://www.w3.org/1999/xhtml"><font size=4><strong>Show all the available medical data</strong></font>
</p>
<form id="WebForm" runat="server" >
<asp:GridView id="ctrlDataGrid" runat="server"DataSourceID="ctrlDataSource"HeaderStyle-BackColor="#CCCCCC"
CellSpacing="0" CellPadding="5" Width="400" AutoGenerateColumns="false" >
<Columns> <asp:BoundField HeaderText="Patient ID"
DataField="patientid"/>….
</Columns>
</asp:GridView>
</p><asp:SqlDataSource ID="ctrlDataSource" runat="server"
ProviderName="System.Data.OleDb"
ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=e:\ectserver\jliu\Database\hospital.mdb"
SelectCommand="SELECT * FROM [medicaldata]" />
HISM
Features Illustrated by Case Study
Multi-platform support Security requirement support Scalability requirement support Performance requirement support
Evaluation
Choice of Test caseCSL Roster example
Choice of Metrics Choice of transformation tools
CSL Roster Example
Evaluation Metrics
Total Line/Token Nesting Depth Cross Reference
- Inner cross reference/outer cross reference Reference to Metamodel
- reference/unique reference
Evaluation Metrics
Model Transformation Tools
JamdaDirect model manipulation using visitor mechanism
Stylus StudioUsing XSLT stylesheet to describe mapping rules
AndroMDAAn extensible template-based code generator
ATLComply to the QVT standard(UML,MOF,XMI)
Evaluation
Evaluation Result Reflecting Metamodel Complicity
Evaluation
Evaluation Result Reflecting Transformation Complicity
Evaluation
Evaluation Result of Transformation Tools
Contribution
A Template Based Model Transformation Approach Using Simplified Metamodel
Benefits of our approach:
Simplicity of source modeling language Readability of transformation definition Support of non-functional requirement
Thank You!
Questions/Comments?
Our Vision for MDE
Our vision for MDE centers on Notations for capturing formal and
complete models of all aspects Knowledge-based approaches and tools
that transform models into complete applications through a process known as model compilation.
MOF
MOF stands for Meta Object Facility enables meta-metamodeling of UML level
metamodels It defines a small set of concepts (such as
package, class, method, attribute…) That allow one to define and manipulate models of
metadata (data about data) are described using a subset UML notation
ZOOM Architecture
Why ZOOM
Problems of UML and OCL Large and complex Inconsistent Loose semantics Difficult syntax of OCL
Key features of ZOOM Simple and consistent Familiar and easy syntax Dual visual and textual representations Extensive libraries
A Simple ZOOM Structural Model Example
namespace roster;
@Entitystruct Player { String playerId; String name; String position; double salary; }
Lexical elements
--Very similar to Java/C#.
Types and variables-- Similar to Java, but more extensive.-- All basic Java data types are supported
Expressions-- All Java expressions are valid in ZOOM
Libraries-- Include common data types, collections (sets, lists, maps), and a lot more.
MOF
HRM
Benefits of MDE
Reduced development time and cost Increased portability, platform
independence, cross-platform interoperability, and reusability
Improved application quality
Model and Metamodel
ModelA consistent and complete set of formal elements
describing a system that is amenable to analysis
MetamodelA specification model for a system under study
where such system under study is itself a valid
model expressed in a certain modeling language
Transformation Control Algorithm
1 Transform(node , RuleSet , Output_Model )2 rule <- findMatchingRule(node , RuleSet )3 targettext <- instantiate( rule .pre , node )4 OutPut_Model . append( targettext )5 foreach c is a child of node6 transform(c , RuleSet , Output_Model )7 endforeach8 targettext <- instantiate( rule .post , node )9 OutPut_Model . append( targettext )
Starting point: transform(root, RuleSet, Output_Model)
Transformation Approaches
Direct-Manipulation Approach Transformation using XSLT Template-Based Approaches QVT(Queries/Views/Transformations)
Example
struct Player { String playerId; String name; String position; double salary; }
[m1] Model: Player
[s1f1]Field: String playerId
[s1f2]Field: String name
[s1f3]Field: String position
[s1f4]Field: Double salary
Example
<Rule match="Struct"> <Mark> <Stereotype name="Entity"/> </Mark> <Pre> <![CDATA[<File name="${name}.java">…
public class ${name} implements Serializable { <MacroRef name="${name}.constrDef"/> <MacroRef name="${name}.operDef"/> <MacroRef name="${name}.attrDef"/>}
…
public class Player implements Serializable { @Entity Player (String id, String name, String position, double salary) { this.id = id; this.name = name; this.position = position; this.salary = salary; } @Id @Column(name = "id") public String getId() { return id; }
…
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