Practical Code Generation: Java Productivity Enhancement David Noble [email_address] Sr. Solutions Architect, Exist Global San Gabriel Valley Java Users Group http://www.sgvjug.org/ February 25, 2008

David Noble

[email_address]

Sr. Solutions Architect, Exist Global

San Gabriel Valley Java Users Group

http://www.sgvjug.org/

February 25, 2008

Target Faster development Less defects http://flickr.com/photos/ntang/21736774

Faster development

Less defects

Target http://flickr.com/photos/ntang/21736774 Tools Practices Productivity

Java public List getIds(List items) { List result = new ArrayList(); Iterator itemIterator = items.iterator(); while (itemIterator.hasNext()) { item = (Item) itemIterator.next(); result.add(item.getId()); } return result; } Example from Matt Good @ matt-good.net

public List getIds(List items) {

List result = new ArrayList();

Iterator itemIterator = items.iterator();

while (itemIterator.hasNext()) {

item = (Item) itemIterator.next();

result.add(item.getId());

}

return result;

}

Java public List<ItemId> getIds(List<Item> items) { List<ItemId> result = new ArrayList<ItemId>(); for (Item item : items) { result.add(item.getId()); } return result; } Example from Matt Good @ matt-good.net

public List<ItemId> getIds(List<Item> items) {

List<ItemId> result = new ArrayList<ItemId>();

for (Item item : items) {

result.add(item.getId());

}

return result;

}

Python def get_ids(items): return [item.id for item in items]

def get_ids(items):

return [item.id for item in items]

Verbosity “ Succinctness is power” Paul Graham [1] Case study [citation needed] Yellowpages.com Originally in Java: 100 KLOC Converted to Rails: 10 KLOC [1] http://www.paulgraham.com/power.html

“ Succinctness is power”

Paul Graham [1]

Case study [citation needed]

Yellowpages.com

Originally in Java: 100 KLOC

Converted to Rails: 10 KLOC

[1] http://www.paulgraham.com/power.html

Defect Rates Bugs/LOC is basically constant CMU study [citation needed] LOC/day is basically constant Fred Brooks

Bugs/LOC is basically constant

CMU study [citation needed]

LOC/day is basically constant

Fred Brooks

Syntax Declarations Casting Generics Data structures Helper classes

Declarations

Casting

Generics

Data structures

Helper classes

Meta-programming Issues Annotations Reflection Aspect-Oriented Programming (AOP) Bytecode manipulation

Annotations

Reflection

Aspect-Oriented Programming (AOP)

Bytecode manipulation

Startup Weekend One weekend to launch Over a dozen companies started Only 1 chose Java

One weekend to launch

Over a dozen companies started

Only 1 chose Java

DEMO Rails web application

Rails Productivity Project generation File generation Model-driven framework Meta-programming

Project generation

File generation

Model-driven framework

Meta-programming

DEMO Basic Java application

Java Productivity: IDE Project generation File generation Code snippet generation

Project generation

File generation

Code snippet generation

Java Productivity: Language Annotations (JSR 175) Metadata Design time for tools Execution time

Annotations (JSR 175)

Metadata

Design time for tools

Execution time

Java Productivity: Framework Model-driven frameworks Grails Wicket NakedObjects OpenXava

Model-driven frameworks

Grails

Wicket

NakedObjects

OpenXava

Java Productivity: AOP Aspect - feature Advice - behavior Joinpoint - execution trigger Pointcut - set of joinpoints Targets - objects to apply aspects to Introduction - add methods to object

Aspect - feature

Advice - behavior

Joinpoint - execution trigger

Pointcut - set of joinpoints

Targets - objects to apply aspects to

Introduction - add methods to object

Bytecode Manipulation Example: persistence injection Hibernate TopLink Libraries, etc ASM, BCEL, CGLIB, Javassist, JiBX

Example: persistence injection

Hibernate

TopLink

Libraries, etc

ASM, BCEL, CGLIB, Javassist, JiBX

DEMO AppFuse

DEMO GUI Builder

SOAP Web Services WSDL to Java Java to WSDL

WSDL to Java

Java to WSDL

Application Generators CASE revisited

CASE revisited

Resources

Resources Code Generation Network http://codegeneration.net/

Code Generation Network

http://codegeneration.net/

Resources Eclipse macros Window > Preferences > Java > Editor > Templates Annotations http://java.sun.com/javase/6/docs/technotes/guides/language/annotations.html http://www.developer.com/java/other/article.php/3556176 http://jcp.org/en/jsr/detail?id=175 Maven archetypes http://maven.apache.org/guides/introduction/introduction-to-archetypes.html

Eclipse macros

Window > Preferences > Java > Editor > Templates

Annotations

http://java.sun.com/javase/6/docs/technotes/guides/language/annotations.html

http://www.developer.com/java/other/article.php/3556176

http://jcp.org/en/jsr/detail?id=175

Maven archetypes

http://maven.apache.org/guides/introduction/introduction-to-archetypes.html

Resources AppFuse http://appfuse.org/display/APF/AppFuse+Maven+Plugin GWT http://code.google.com/webtoolkit/

AppFuse

http://appfuse.org/display/APF/AppFuse+Maven+Plugin

GWT

http://code.google.com/webtoolkit/

Resources Wicket http://wicket.apache.org/ Grails http://grails.org/ NakedObjects http://www.nakedobjects.org/

Wicket

http://wicket.apache.org/

Grails

http://grails.org/

NakedObjects

http://www.nakedobjects.org/

Resources Metro (JAX-WS et al) https://metro.dev.java.net/ Axis2 http://ws.apache.org/axis2/ CXF (formerly XFire) http://cxf.apache.org/

Metro (JAX-WS et al)

https://metro.dev.java.net/

Axis2

http://ws.apache.org/axis2/

CXF (formerly XFire)

http://cxf.apache.org/

Resources Netbeans Matisse http://www.netbeans.org/features/java/swing.html Eclipse VE http://wiki.eclipse.org/VE

Netbeans Matisse

http://www.netbeans.org/features/java/swing.html

Eclipse VE

http://wiki.eclipse.org/VE

Resources AOP (Aspect Oriented Programming) AspectJ http://www.eclipse.org/aspectj/ JBoss AOP http://www.jboss.org/jbossaop/ Spring http://springframework.org/about

AOP (Aspect Oriented Programming)

AspectJ

http://www.eclipse.org/aspectj/

JBoss AOP

http://www.jboss.org/jbossaop/

Spring

http://springframework.org/about

Resources Eclipse JET http://www.eclipse.org/modeling/m2t/?project=jet Eclipse EMF http://www.eclipse.org/modeling/emf/

Eclipse JET

http://www.eclipse.org/modeling/m2t/?project=jet

Eclipse EMF

http://www.eclipse.org/modeling/emf/

Resources Sculptor http://fornax-platform.org/cp/display/fornax/Sculptor+(CSC) http://www.theserverside.com/tt/articles/article.tss?l=ProductivityWithSculptor OptimalJ http://frontline.compuware.com/javacentral/tools/

Sculptor

http://fornax-platform.org/cp/display/fornax/Sculptor+(CSC)

http://www.theserverside.com/tt/articles/article.tss?l=ProductivityWithSculptor

OptimalJ

http://frontline.compuware.com/javacentral/tools/

Resources MDA (model driven architecture) http://www.omg.org/mda/ Executable UML http://en.wikipedia.org/wiki/Executable_UML

MDA (model driven architecture)

http://www.omg.org/mda/

Executable UML

http://en.wikipedia.org/wiki/Executable_UML

DISCUSSION Productivity, practices, tools Thanks for coming! David Noble [email_address]