J2EE enterprise architecture with in-line updates

Posts on the
Design Decomposition Blog

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

The Design Decomposition Blog
is written by Doug Barry.

This architecture shows two existing relational databases being used by a J2EE application server. One database is being accessed using JDO and the other by JDBC. A third database is being used in the middle tier as an EJB accelerator.

The database used as an EJB accelerator could hold data that is unique to the needs of the EJB components, a copy of the data that is updated in the relational database, or both types of data. This is referred to as having "in-line updates" because any updates by EJB components are made directly, or in-line, to the underlying relational database. This is in contrast to "staged updates" (new window).

Object databases make for an excellent middle-tier database for use with EJB components. This is because the object model used by EJB components is the same model used by object databases. For more information, see:

This architecture using an object database will likely provide better performance than if no database or a relational database was used in the middle tier. In either case, the objects in the EJB components would need to be mapped to some degree to the relational model -- either in the middle tier or in the EIS Tier. This is most likely true even with the SQLJ using the SQL:1999 object model. See Part 2 in SQLJ (new window). For an even higher-performing architecture, see "staged updates" (new window).

J2EE enterprise architecture with in-line updates JDO JDBC EJB

Multiple components use JDO to access the relational database. JDO allows the mapping between Java objects and tables to be defined in one place for use by the multiple components. See JDO data conversion (new window).

The JDBC interface is used by the Web Server to access simple data. See when to use JDBC with Java application servers (new window).

Also see:

More on the general topic: Architectures using databases in the middle tier

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