Friday, December 16, 2005

Re; Free UML Tool?

There is an experimental one being developed at MIT:

Singleton design pattern

Mohnish & I had a small discussion recently about Singleton vs static method only class.

A few advantages of Singleton we came up with were..

Singletons can be subclassed. And preferably used with Factories or Registries.

Another subtle difference was usage. When you have a singleton, you get back a class instance on which you then perform operations. Like..

Singleton singleton = Singleton.getInstance();

Compare this to ..


The Singleton is just more correct because it allows to think in terms of a type and its behaviour and limits the instances. The static method form does not exhibit the same level of coherent behaviour. It's not the most cleanest distinction but I guess you know what I mean.

I was in the mood to read more on this and stumbled on an article on Javaworld - Simply Singleton. Definitely worth a read.

...which reminded me of a basic feature of Singletons we missed - controlled instance creation

Thursday, December 15, 2005

RE: Free UML Tool?

Revo, Most of the reverse engineering software's that can be found for
UML are not freely available. There's EclipseUML @ that you can try. The free version does not have
reverse engineering capabilities and the Enterprise Edition has a 30-day
evaluation limit.

There are others too, but more or less the story stays the same, go to -

If you do decide to evaluate EclipseUML (which is a plug-in for Eclipse)
make sure you have the dependencies of the EMF, UML and GEF packages


Sunday, December 11, 2005

Free UML Tool?

Do any of you use any UML tools? I was looking for a tool which would convert existing code (again Java) to a UML Diagram - Class and sequence diagrams.

Preferably the tool should be light on resources.