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Moving Enterprise Services to WCF
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Like Web Services, the Enterprise Services programming model is based on attributes. Despite this, there are several issues that prevent the Enterprise Services migration from achieving a trivial rating. First, the attribute names and settings are extremely different from those you ve come to know in Enterprise Services. For example, the familiar Requires Transactions, Supports Transactions, etc. settings are replaced by an attribute setting named AutoEnlistTransaction. Furthermore, the Enterprise Services technology is tightly bound to the distributed object mindset, and has few facilities for a serviced-oriented implementation. Therefore, the migration path is rated as non-trivial. That said, understand that migrating an Enterprise Service implementation promises to be much easier than a WSE 2.0 implementation primarily because of its attribute-based programming model. But there are too many caveats to call it a truly simple migration. These caveats include: Different attribute names and settings. WCF not only changes the attributes for transactional behavior, but it also uses different attributes for lifetime and security settings. Loosely Coupled Events (LCE). Depending on the scenario, LCE code may require significant modifications. Implicit Reference Passing. In classic distributed object programming, it s common to pass a reference back to the client that provides direct access to another object on the server. However, this practice violates the autonomous tenet of SO, and, therefore, is not allowed in WCF. Instead, WCF supports the notion of explicitly returning endpoint references essentially URLs that the client can use to access another service, but only through a service boundary layer.
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If you re writing Enterprise Service code today, you obviously cannot avoid the attribute name issue. However, if you can avoid using LCE or returning objects by reference, then you can greatly simplify your future migration to WCF.
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Given that .NET Remoting does not provide an attribute-based programming model and that it fully embraces the distributed object mindset, it is no surprise that it also presents a nontrivial migration path to WCF. Much like Enterprise Services, however, if you carefully implement your Remoting solutions by avoiding specific features of .NET Remoting, you ll enjoy a much easier migration to WCF in the future. Here are a few suggestions: Avoid using .NET Remoting extensibility. .NET Remoting s channel, sink, and formatter objects allow you to extend its behavior. For example, many have used these objects to implement a secure channel that automatically encrypts and decrypts the messages. To migrate to WCF, however, all of this code will need to be rewritten against WCF s extensibility model, which has similar object names but different interfaces and behaviors. Also note that a lot of functionality, such as security, is already implemented in WCF so custom extensions may not be required. Use interfaces for all remoted classes. Split each remoted class into an interface and a class implementation. This not only simplifies deployment today, but it also eases migration to WCF in the future. Strive for a service oriented solution. Although it s difficult if not impossible to implement a pure SO solution using Remoting, taking a few small steps toward SO is relatively easy and can greatly simplify a future migration. These steps include using chunky interfaces, using stateless objects, avoiding Remoting events, and avoiding implicitly returning object references.
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Although the MSMQ technology is well-suited to the service-oriented mindset, its programming model is different enough to warrant a non-trivial migration rating. Keep in mind that it s extremely easy to interoperate between WCF and MSMQ. Given this, plus given MSMQ s already rich messaging infrastructure, migrating MSMQ code will likely be a low priority. MSMQ offers a few different APIs: a Win32 unmanaged API, a COM-based API, and a managed API named System.Messaging. The best approach you can take today to ease future MSMQ migration is to work exclusively through the managed System.Messaging API.
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