john j. sung ta consulting
DESCRIPTION
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 PresentationTRANSCRIPT
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
traversal.java
AspectJtraversal.class
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
TraversalJ Overview
• Implement using DemterJ– class dictionary– traversals
• Obtain Class Graph using AspectJ & DJ– CreateClassGraph.java
• Output traversal java code– AspectJTraversal.java
TraversalJ System
traversal.trv
COM1205Middle-ware
CreateClassGraph
AspectJTraversal traversal.java
Main
ClassGraphEvent(args, cg)
AspectJTraversal
• Java code to translate class graph + strategy into AspectJ code
• Processes DJ classes to do most of the work
TraversalJ Syntax
• ClassGraph Specification– ClassGraph cgvar;– ClassGraph cgvar = new ClassGraph(cg,
“strategy”);
• Traversal Specification– declare traversal tvar : “strategy”;– declare traversal tvar(cgvar) : “strategy”;
TraversalJ Syntax
• Traversal Aspect Specification– aspect aspectName { – class graph declaration;– traversal declaration;– }
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 *”;}
Graphs and Traversals?
• Need to obtain Default Class Graph
• Keep track of declared Class Graphs
• Process traversal with specific Class Graph
TraversalJ System
traversal.trv
COM1205Middle-ware
CreateClassGraph
AspectJTraversal traversal.java
Main
ClassGraphEvent(args, cg)
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);
ClassGraphListener/Factory
ClassGraphFactory
ClassGraphListener
MyListener
getNew()
new MyListener()
ClassGraphListener
CreateClassGraph
ClassGraphListener/Factory
ClassGraphListener
MyListener
CreateClassGraph
ClassGraphEvent(args, cg)
Some Other Code
.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
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
Fun with Recursion
traversal.trv
COM1205Middle-ware
DemeterJ
traversal.java
AspectJ
TraversalJ
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
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
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
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
Questions?
• Reaches both KLE and TAC.• http://www.ccs.neu.edu/home/lieber/com3362/w02/
CCS_AspectJ_Usage.html