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.
EJB accelerators exist primarily in the middle tier of a J2EE
architecture. Their role is to accelerate the performance of storing data needed
for Enterprise Java Beans (EJBs). By speeding up the performance of the data
storage, the performance of EJBs are accelerated in general. There are four ways that this can be done.
The first way is with a transparent interface such as Java Data Objects (JDO)
coupled with an object database. In this case, there is no need for a mapping
layer because the Java object model is the same model used by the object
database. See transparent
persistence in object databases (new window).
The lack of a mapping layer is show in this diagram.
The second way is with a transparent interface such as Java Data Objects
(JDO) coupled with a relational database. In this case, there is a need for a
mapping layer because the Java object model may not match the model used by the
relational database. Nevertheless, the mapping can be moved to one location as
described in JDO data
conversion (new window). Also see transparent
persistence in object-relational mapping (new
window).
The third way is with a call-level interface such as JDBC coupled with a
relational database. In this case, there is a need for a mapping layer
because the Java object model may not match the model used by the relational
database. The mapping would need to be done at the application level as
described in JDBC data
conversion (new window). Be sure to take a look at transparent persistence vs. JDBC call-level interface (new window). This outlines some
disadvantages of using JDBC that you should consider when designing
persistence for J2EE.
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