You might have seen the recent news reports about the collision between U.S. and Russian communication satellites. The U.S. satellite was one of the Iridium satellites. What wasn’t reported and you probably don’t know is that an object database management system (ODBMS) is an important part of the Iridium system. Even though ODBMSs are a [...]
February 13, 2009
I am now also posting on the Cutter Blog. My initial posting is (The Acronym) SOA is (Perhaps) Dead (at Some Companies); Long Live Services. It is a response to Anne Thomas Manes’ SOA is Dead; Long Live Services on her blog at the Burton Group.
January 9, 2009
The typical definition of an atomic task or process is one that cannot be decomposed further. This is vague and subject to interpretation. The Decomposition Matrix on this site uses a specific definition: A task (for business process diagrams) or a process (for data flow diagrams) is atomic if every input relates to every output [...]
December 3, 2008
My last posting referenced the criteria for a well-formed business process diagram mentioned in Business Process Driven SOA using BPMN and BPEL by Matjaz B. Juric and Kapil Pant. I am going to expand on their criteria to create a more comprehensive definition of a well-formed business process diagram. To start, here are three criteria [...]
November 18, 2008
I recently received two new books on business process modeling. Both books looked interesting because they had great titles. As it turns out, one book is great and the other not so good. The not so good book is Business Process Driven SOA using BPMN and BPEL by Matjaz B. Juric and Kapil Pant. There [...]
October 9, 2008
The Design Decomposition Blog is written by Doug Barry.
It can be very tempting to write your own object-relational mapping. If fact,
there are books and articles advocating this. The bottom line, however, is that
unless you have a very simple mapping, it is a bad idea to write your own
mapping layer.
I have talked with plenty of developers who tried writing a mapping layer. The
result, although anecdotal, is universal. The mapping code, in each case, grew to
be 30 to 40 percent of the code needed for the entire application. There are two
problems that resulted from this. The first is that this is a lot of effort
towards writing code that is not addressing the business problem that prompted
the application development in the first place. The second is that, given the
development models that show how code defects rise with total code, a
significant number of additional defects appeared which, again, are not directly related to
the business problem being addressed by the application development.
So, if you have a relational database and you want to use C++ or Java, by all
means use an object-relational product. Writing a mapping layer is much harder
than you might expect. Some of the reasons this is hard can be seen in the
considerations for mapping:
There are nearly 400 pages of articles on this site with over 50 pages on object-relational mapping.
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