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Greetings...
Many Java developers don't give a second thought to the event-listener
paradigm or how it's typically implemented. Calling a method on all your
object's listeners is boilerplate code that lots of us can bang out. But
do you ever wonder what happens on those callbacks? Can you trust the
listeners? What if they're poorly behaved, or take so long that they slow
down your thread? What if they never return at all? Suddenly, it's not
such a simple prospect.
Andrew Thompson's article, "Event Executors," offers a modern
reconsideration of the event-listener paradigm and how it's implemented
in Java. "Listeners are simple, familiar, flexible, and easy to
implement, but they call into code written by other developers, which can
cause problems." Using the concurrency utilities of J2SE 5.0, Andrew
shows how you can use a multi-threaded approach to improve performance,
and isolate misbehaving listeners.
http://www.onjava.com/pub/a/onjava/2005/03/23/executors.html
"Requirements change very quickly as business and technology change. But
with every change, big or small, do we need to throw away the complete
system and start over?" Palash Ghosh says no, and the way to prevent it
is to isolate functionality into components, classes, or groups of classes
with an external API that fulfills a given requirement. In "Java
Component Development: A Conceptual Framework," he works out a set of best
practices for thinking about and developing components in order to
maximize flexibility.
http://www.onjava.com/pub/a/onjava/2005/03/23/components.html
In a feature article from dev2dev.bea.com, Subbu Allamaraju introduces the
Web Services for Remote Portlets protocol. "Inside WSRP" shows how
"instead of bundling all your portlets with the portal in a single
application, you can choose to deploy your portlets in individual portlet
applications, and let the portal consume those portlets using WSRP."
http://dev2dev.bea.com/products/wlportal81/articles/inside_wsrp.jsp
Portlets are also highlighted in this week's feature article from
java.net: "Streamline Your Portlet Development with MVCPortlet Framework."
In it, Padmanabh Dabke notes that while "Several MVC frameworks (e.g.,
Struts) exist for building servlet-based web applications [...] these
frameworks do not support portlet development." Fortunately, the
MVCPortlet framework allows developers to create JSR-168-compliant
portlets with a pattern similar to MVC.
http://today.java.net/pub/a/today/2005/03/08/mvcportlet.html
Please join us again next week.
Chris Adamson,editor
ONJava.com
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