O'REILLY NETWORK'S ONJava.com NEWSLETTER
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The Independent Source for Enterprise Java
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Greetings...
Tuesday was a day of big surprises in Atlanta. The JBoss World Conference
opened not to a sunny southern spring day, but to a gentle coating of snow
and light flurries across Centennial Olympic Park. Not that it put a
damper on the JBoss World activities -- Marc Fleury's keynote was striking
in its vision and new directives for the company. Expect a full wrap-up
next week on ONJava.
For those who might have been wondering, as I mentioned something in last
week's newsletter, your editor and his wife were sent to the hospital that
afternoon, and Quinn Aeris Adamson was born at 11:31 p.m. that night.
WS-Addressing is a new specification that may soon be of significant
interest to web services developers, filling some of the gaps left by
basic SOAP-based messaging. As Beth Linker writes in "Introduction to
WS-Addressing," a feature from sister site dev2dev.bea.com, "SOAP does not
provide a standard way to specify where a message is going, how to return
a response, or where to report an error. Those details have historically
been left up to the transport layer." WS-Addressing offers more
flexibility in these areas, and more.
http://dev2dev.bea.com/technologies/webservices/articles/ws_addressing_intro.jsp
"Business analysts and managers illustrate systems using flowcharts and
workflow diagrams instead of class hierarchies and sequence diagrams,"
which can be a different way of thinking from the hierarchical thinking
required by object-oriented programming. But Bill Siggelkow, author of
"Jakarta Struts Cookbook," says that the Jakarta Commons Chain solves some
of these problems. In "A Look at Commons Chain: The New Java Framework",
he shows how several classic design patterns help Commons Chain simplify
sequential activities for Java programmers.
http://www.onjava.com/pub/a/onjava/2005/03/02/commonchains.html
Aspect-Oriented Programming (AOP) and attributes have their own typical
examples--you often see AOP introduced for logging and attributes are
great for generating code. But what happens when the two are combined?
Bill Burke explains: "Together, they make a new powerful combination that
gives framework developers a more expressive way of providing their APIs."
In "Aspect-Oriented Annotations", he shows how to use attributes to
indicate the point-cuts for AOP, in effect extending the Java syntax by
providing, for example, a pseudo-keyword that indicates a method is to be
fired off in its own thread.
http://www.onjava.com/pub/a/onjava/2004/08/25/aoa.html
In this week's feature article from java.net, Chet Haase writes: "Any time
you introduce dynamic effects, animations, or time-based events to a Java
application, you find yourself re-implementing the same functionality you
have written for every application that required timing or animation. The
built-in APIs are powerful, but they require that you write a fair amount
of boilerplate code." In "Timing is Everything", he looks at how to
address this situation and introduces a new java.net project,
timingframework.dev.java.net, as a place to develop an improved framework
for handling these tasks.
http://today.java.net/pub/a/today/2005/02/15/timing.html
Please join us again next week.
Chris Adamson, editor
ONJava.com
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