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.
Inheritance in the object model is a means of defining one class in terms of another. This is
common usage for most of us. For example, a conifer is a type of tree. There are
certain characteristics that are true for all trees, yet there are specific
characteristics for conifers.
Note that in an object model, there is no distinction in usage between system
pre-defined types and user-defined types. This is known as extensibility.
So it is possible to define a type as a sub-type of a system type or as a
sub-type of a user-define type.
In this example, a Student is a type of
Person. Likewise, a Employee is a type of Person. Both Student and
Employee inherit all the attributes and methods of Person. Student has a
locally defined student ID attribute. Employee has a locally defined
employee ID attribute.
So, if you would look at a Student object, you would see attributes of
name, date of birth, parents, children, and student ID.
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