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Design Decomposition Blog
Iridium Satellite Collision in Space
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
(The Acronym) SOA is (Perhaps) Dead (at Some Companies); Long Live Services
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
Atomicity
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
Well-Formed Business Process Diagrams
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 from [...]
November 18, 2008
Recent Business Process Modeling Books
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 are [...]
October 9, 2008
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This table shows a summary of the similarities and differences between the two approaches to transparent persistence: ODMG 3.0 and JDO. It is from a presentation at JavaOne by Heiko Bobzin of POET Software.

ODMG 3.0 JDO
Object Model
Transparent Persistence Transparent Persistence
Persistence by Reachability Persistence by Reachability
Java, C++, and Smalltalk Language Bindings on top of ODMG object model Tight integration with Java object model
Vendor specific interfaces PersistenceCapable interface
Collection factory for five basic collections Collection factory “by Example”, Second Class Objects
Object identity managed by database system Three identity models (more)
Life Cycle
Objects live until transaction completes Objects can live as long as PersistenceManager (more)
Objects can not be accessed after transaction completes API allows the setting of properties
Callbacks not defined Callbacks for load, store, delete, and clear
Databases and Transactions
Easy to use but proprietary database and transaction management Databases, connections and transactions fit into other Java APIs
No distributed transactions defined Support for distributed transactions
Vendor specific extensions for managed environments (EJB) Support for managed environments (EJB)
Vendor specific extension for optimistic locking Optimistic locking is optional API
Explicit locking of objects No explicit locking -- locks set automatically
Query
OQL: an extensive object query language Queries based on Java programming language -- JDOQL (more)
Complex query expressions Simple filter strings
Results can be compositions, projections or just an integer Results are always collections of persistence capable objects
Class name is part of query string Class objects explicitly used as parameters
No imports or name scope Imports, "this", named parameters

This table, copyright © 2001 FastObjects by Poet, used with permission.

For more information on transparent persistence, see:

>>
Also see transparent persistence vs. JDBC call-level interface (new window).

For more information on ODMG 3.0 and JDO as well as other database specifications, see the related content below.

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