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Theoretically, every computer can be viewed as a state machine or, in actuality, a set of state machines with each application program and the operating system being a state machine The concept of a state machine could be further applied to major components of an operating system, such as different protocol implementations, for example, thus allowing an operating system itself to be viewed as a set of state machines In practice, a state machine that incorporates a set of functions supporting the operations of a particular protocol becomes a protocol machine..

This is a simple implementation that involves adding a single column to each database table you wish to protect from lost updates. This column is generally either a NUMBER or DATE/TIMESTAMP column. It is typically maintained via a row trigger on the table, which is responsible for incrementing the NUMBER column or updating the DATE/TIMESTAMP column every time a row is modified.

I recommend that you configure CSLA .NET to use the NDCS only if you use the DataContract attribute instead of the Serializable attribute in your business classes.

Note I said it was typically maintained via a row trigger. I did not, however, say that was the best way or right

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way to maintain it. I would personally prefer this column be maintained by the UPDATE statement itself, not via a trigger because triggers that are not absolutely necessary (as this one is) should be avoided. For background on why I avoid triggers, refer to my Trouble With Triggers article from Oracle Magazine, found on the Oracle Technology Network at http://www.oracle.com/technology/oramag/oracle/08-sep/o58asktom.html.

The application you want to implement optimistic concurrency control would need only to save the value of this additional column, not all of the before images of the other columns. The application would only need to verify that the value of this column in the database at the point when the update is requested matches the value that was initially read out. If these values are the same, then the row has not been updated. Let s look at an implementation of optimistic locking using a copy of the SCOTT.DEPT table. We could use the following Data Definition Language (DDL) to create the table: ops$tkyte%ORA11GR2> create table dept 2 ( deptno number(2), 3 dname varchar2(14), 4 loc varchar2(13), 5 last_mod timestamp with time zone 6 default systimestamp 7 not null, 8 constraint dept_pk primary key(deptno) 9 ) 10 / Table created. Then we INSERT a copy of the DEPT data into this table: ops$tkyte%ORA11GR2> insert into dept( deptno, dname, loc ) 2 select deptno, dname, loc 3 from scott.dept;

To configure CSLA .NET to use the NDCS, you must add an element to the appSettings of your app.config or web.config file:

4 rows created ops$tkyte%ORA11GR2> commit; Commit complete That code recreates the DEPT table, but with an additional LAST_MOD column that uses the TIMESTAMP WITH TIME ZONE datatype (available in Oracle9i and above) We have defined this column to be NOT NULL so that it must be populated, and its default value is the current system time This TIMESTAMP datatype has the highest precision available in Oracle, typically going down to the microsecond (millionth of a second) For an application that involves user think time, this level of precision on the TIMESTAMP is more than sufficient, as it is highly unlikely that the process of the database retrieving a row and a human looking at it, modifying it, and issuing the update back to the database could take place within a fraction of a second.

The odds of two people reading and modifying the same row in the same fraction of a second are very small indeed Next, we need a way of maintaining this value We have two choices: either the application can maintain the LAST_MOD column by setting its value to SYSTIMESTAMP when it updates a record, or a trigger/stored procedure can maintain it Having the application maintain LAST_MOD is definitely more performant than a trigger-based approach, since a trigger will add additional processing on top of that already done by Oracle However, this does mean that you are relying on all of the applications to maintain LAST_MOD consistently in all places that they modify this table So, if each application is responsible for maintaining this field, it needs to consistently verify that the LAST_MOD column was not changed and set the LAST_MOD column to the current SYSTIMESTAMP.

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