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John J. Sung TA Consulting

John J. Sung TA Consulting

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TraversalJ. John J. Sung TA Consulting. Motivation for TraversalJ. KL Enterprises identified AOP Enter into the AOP market early Add value by adding traversals to Java Contract COM 1205 Inc. TA Consulting Recommendations. High-Level System Overview. traversal.trv. TraversalJ. - PowerPoint PPT Presentation

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Page 1: John J. Sung TA Consulting

John J. Sung

TA Consulting

Page 2: John J. Sung TA Consulting

Motivation for TraversalJ

• KL Enterprises identified AOP

• Enter into the AOP market early

• Add value by adding traversals to Java

• Contract COM 1205 Inc.

• TA Consulting Recommendations

Page 3: John J. Sung TA Consulting

High-Level System Overview

traversal.trv TraversalJ

traversal.java

AspectJtraversal.class

Page 4: John J. Sung TA Consulting

System Components

• traversal.trv – TraversalJ file with class graph and traversal declarations

• TraversalJ – DemeterJ program by COM1205

• traversal.java – Traversal code in AspectJ• AspectJ – Aspect Oriented Programming

Tool

Page 5: John J. Sung TA Consulting

TraversalJ Overview

• Implement using DemterJ– class dictionary– traversals

• Obtain Class Graph using AspectJ & DJ– CreateClassGraph.java

• Output traversal java code– AspectJTraversal.java

Page 6: John J. Sung TA Consulting

TraversalJ System

traversal.trv

COM1205Middle-ware

CreateClassGraph

AspectJTraversal traversal.java

Main

ClassGraphEvent(args, cg)

Page 7: John J. Sung TA Consulting

AspectJTraversal

• Java code to translate class graph + strategy into AspectJ code

• Processes DJ classes to do most of the work

Page 8: John J. Sung TA Consulting

TraversalJ Syntax

• ClassGraph Specification– ClassGraph cgvar;– ClassGraph cgvar = new ClassGraph(cg,

“strategy”);

• Traversal Specification– declare traversal tvar : “strategy”;– declare traversal tvar(cgvar) : “strategy”;

Page 9: John J. Sung TA Consulting

TraversalJ Syntax

• Traversal Aspect Specification– aspect aspectName { – class graph declaration;– traversal declaration;– }

Page 10: John J. Sung TA Consulting

TraversalJ Syntax Example

aspect MyTraversal {

ClassGraph defaultCG;

ClassGraph cg1 = new ClassGraph(defaultCG, “from * bypassing {java.lang.String} to

*”);

declare traversal t1: “from CompoundFile to SimpleFile”;

declare traversal t2(cg1): “from CompoundFile to *”;}

Page 11: John J. Sung TA Consulting

Graphs and Traversals?

• Need to obtain Default Class Graph

• Keep track of declared Class Graphs

• Process traversal with specific Class Graph

Page 12: John J. Sung TA Consulting

TraversalJ System

traversal.trv

COM1205Middle-ware

CreateClassGraph

AspectJTraversal traversal.java

Main

ClassGraphEvent(args, cg)

Page 13: John J. Sung TA Consulting

ClassGraphListener/Factory

• ClassGraphListenerFactory– Need a way to obtain an instance of

Middle-ware code– ClassGraphListener getNew();

• ClassGraphListener– need a way to pass ClassGraph and

arguments– abstract void ClassGraphEvent(String []

args, ClassGraph cg);

Page 14: John J. Sung TA Consulting

ClassGraphListener/Factory

ClassGraphFactory

ClassGraphListener

MyListener

getNew()

new MyListener()

ClassGraphListener

CreateClassGraph

Page 15: John J. Sung TA Consulting

ClassGraphListener/Factory

ClassGraphListener

MyListener

CreateClassGraph

ClassGraphEvent(args, cg)

Some Other Code

Page 16: John J. Sung TA Consulting

.prj File

• Copy CreateClassGraph.java and AspectJTravearsal.java into a directory

• Add the directory for the JAVADIR option in .prj file

• COMPILER = ajc• TEST_ARGS = -d trav some.trv• TEST_INPUT = some.trv

Page 17: John J. Sung TA Consulting

Testing TraversalJ

• Create some traversal file that implements a traversal that’s used in TraversalJ.

• Generate the .java file into a directory• Add the directory for JAVADIRS• Add code to call the traversal method

in .beh files.• Compile with traversal code and test

Page 18: John J. Sung TA Consulting

Fun with Recursion

traversal.trv

COM1205Middle-ware

DemeterJ

traversal.java

AspectJ

TraversalJ

Page 19: John J. Sung TA Consulting

Debugging Strategy

• Traversals– You can use DJ to output traversal graphs– Look for error messages from demeterj

• General Debugging– have some variable debug to turn on debug

output

• AspectJTraversal– debug : outputs processing information– addPrintingAdvice : Outputs code for printing

traversal method calls

Page 20: John J. Sung TA Consulting

TraversalJ Project Phases

• Phase1 – Generate Class Dictionary for the traversal language

• Phase 2 – Implement –d directory option, basic traversal with default Class Graph

• Phase 3 – Implement Class Graph declaration and definition

• Phase 4 – Test code by generating a traversal used in TraversalJ

Page 21: John J. Sung TA Consulting

Project Submission

• Use ~jser/submit-proj

• README – How to compile your program– How to generate traversal code– How to test traversal code

• Due Date: March 8, 2002

Page 22: John J. Sung TA Consulting

Project Write Up

• Class Graph UML Diagram

• Document Traversals

• Document Testing of Traversal Code

• Evaluate software design and usefulness of TraversalJ

• Drop it off in class or mail box of TA

• Due Date: March 11, 2002

Page 23: John J. Sung TA Consulting

Questions?

[email protected]

• Reaches both KLE and TAC.• http://www.ccs.neu.edu/home/lieber/com3362/w02/

CCS_AspectJ_Usage.html