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The BusinessBase class implemented in 3 includes support for validation rules. Each rule is a method with a signature that conforms to the RuleHandler delegate. A business object can implement business rules conforming to this delegate, and then associate those rule methods with the properties of the business object. Most applications use a relatively small, common set of validation rules such as that a string value is required or has a maximum length, or that a numeric value has a minimum or maximum value. Using reflection, it is possible to create highly reusable rule methods which is the purpose behind the Csla.Validation.CommonRules class. Obviously, using reflection incurs some performance cost, so these reusable rule methods may or may not be appropriate for every application. However, the code reuse offered by these methods

But there is always a but you must take care to understand these different isolation levels and their implications Remember, with isolation set to SERIALIZABLE, you will not see any changes made in the database after the start of your transaction, until you commit Applications that attempt to enforce their own data integrity constraints, such as the resource scheduler described in 1, must take extra care in this regard If you recall, the problem.

is very powerful, and most applications won t be adversely affected by this use of reflection. In the end, whether you decide to use these rule methods or not is up to you.

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in 1 was that we could not enforce our integrity constraint in a multiuser system since we could not see changes made by other uncommitted sessions. Using SERIALIZABLE, we would still not see the uncommitted changes, but we would also not see the committed changes made after our transaction began! As a final point, be aware that SERIALIZABLE does not mean that all transactions executed by users will behave as if they were executed one right after another in a serial fashion. It does not imply that there is some serial ordering of the transactions that will result in the same outcome. The phenomena previously described by the SQL standard do not make this happen. This last point is a frequently misunderstood concept, and a small demonstration will clear it up. The following table represents two sessions performing work over time. The database tables A and B start out empty and are created as follows: ops$tkyte@ORA10G> create table a ( x int ); Table created. ops$tkyte@ORA10G> create table b ( x int ); Table created. Now we have the series of events shown in Table 7-7. Table 7-7. SERIALIZABLE Transaction Example

The Device Profile for Web Services (DPWS) was initially published in May 2004 by Microsoft It implements a subset of the Web Services specifications but adds a mechanism so clients can easily discover devices Once a device is discovered, a client can retrieve a description of services hosted on that device and use those services Microsoft Windows Vista natively integrates DPWS with a stack called Microsoft Web Services on Devices API (WSDAPI) to use services from a device or provide services to other devices The DPWS focuses on Ethernet-enabled (LAN- or WLAN-enabled), resource constrained devices, and its intentions are similar to those of Universal Plug and Play (UPnP) You could look at the DPWS as a kind of USB for Ethernet, but it is fully aligned with the Web Services specification.

If reflection-based rules are problematic for your application, you can implement hard-coded rule methods on a per-object basis.

Alter session set isolation_level= serializable;

Alter session set isolation_level= serializable; Insert into a select count(*) from b; Insert into b select count(*) from a; Commit; Commit;

If you find the idea of these reusable rules appealing and useful, you may opt to create your own library of reusable rules as part of your application. In that case, you ll want to add a class to your project similar to CommonRules, and you can use the rule methods from CommonRules as a guide for building your own reusable rule methods.

It builds on core Web Services standards but is a lightweight protocol that supports dynamic discovery, one- and two-way control messaging, and eventing The DPWS does not define specific application messages; these are left to the device manufacturers Devices are units that are attached to a network and may include zero or more services A device can provide services for other network nodes and/or use the services of other devices Examples are printers, scanners, projectors, cameras, and video systems The DPWS enables you to show a presentation on your projector using WLAN without taking care of cables You can also think of devices within your home that would benefit from automation The temperature level of your next generation freezer may be controlled from a remote control, PDA, mobile phone, or PC Or a washing machine could submit its progress to your mobile phone.

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