CodEagle

Recently I had an interesting discussion on the DDD mailing list about value objects.

Value objects: “These are the objects that describe things” [From: DDD, Evans]

The discussion centered on the immutability of value objects. The strange thing is that many developers (in the role a modeller) emphasize this immutability. I’ve seen this happen quite often. While I do not think that is the essence of a value object at all. read more…

In response to a finding during an internal project code review last Friday and an article in the latest Java Magazine we had an interesting discussion on the reasons for using exceptions. Eventually I supported two rules of thumb, one I had thought of myself, the other from a colleague of mine.

The following rules of thumb should be seen as in the context of a development platform that supports their use and a developer who uses as the following, basic rule for recognizing the situation to use an exception: use an exception if you cannot follow the normal execution path any more, in other words, if something extraordinary happens or has happened. read more…

The last few week have been quite exhilirating! Two weeks of really exploring a domain, getting to know a new client’s business and language. I have always liked going through such a phase and one does not always get the chance to do something like that for two whole weeks at the client’s site. read more…