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.
The JDO PersistenceManager is the primary interface for JDO-aware application
components. It is the factory for the query interface and contains methods for managing the
life cycle of persistent instances.
The JDO PersistenceManager interface is designed to support a variety of
environments and data sources, from small footprint, real-time embedded systems to large enterprise
application servers. It might be a layer on top of a standard Connector implementation such as
JDBC or JMS, or itself include connection management and distributed transaction
support.
J2EE Connector support is optional. If it is not supported by a JDO implementation, then
a constructor for the JDO PersistenceManager or PersistenceManagerFactory is required.
There are three primary environments in which the JDO PersistenceManager is
designed to work:
Non-managed (non-application server): minimum function, single transaction,
single JDO PersistenceManager where compactness is important.
Non-managed but where extended features are desired: multiple
PersistenceManager instances may support multiple data sources, XA coordinated transactions, or nested
transactions.
Managed: where the full range of capabilities of an application server is required.
A JDO PersistenceManager instance supports one transaction at a time and uses one
connection to the underlying data source at a time. The JDO PersistenceManager
instance might use multiple transactions serially, and might use multiple connections
serially. Therefore, to support multiple concurrent connection-oriented data sources in an
application, multiple JDO PersistenceManager instances are required.
Additional
information on the JDO PersistenceManager can be found at the Sun
website (new window).
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