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The transport and formatter layer delegates message serialization (and deserialization) to a dedicated object called the MessageFormatter, which is responsible for translating a byte stream between a formatted message and an in-memory Message object representation of the message.

This code looks much simpler than the earlier code and is easier to maintain. The code that uses the EAOs is simpler too:

@Stateless public class PlaceBidBean implements PlaceBid { @EJB private BidEAO bidEAO; public Long addBid(String userId, Long itemId, Double bidPrice) throws BidException { ... Bid bid = bidEAO.addBid(item, userId, bidPrice); return bid.getBidId(); } }

Implementing EAOs using session beans looks lean and mean. Some purists will resent you considering this approach, but we recommend that you seriously contemplate it because, as a side effect of using session beans for your EAOs, you automatically receive declarative transactions and a container-managed EntityManager. That s nothing to sneeze at! We ll discuss how the Spring framework uses the JpaTemplate to provide EAO support in chapter 16, when we discuss JPA with Spring applications. But now, let s review the Session Fa ade pattern.

Only instances of managed types can be allocated on the GC heap Trying to instantiate a native type like std::string via gcnew will cause a compiler error However, since primitives are managed types in the managed compilation model, they can be instantiated on the managed heap, too The following expression is legal if you compile with /clr: gcnew int(0); Since the managed compilation model can treat primitives as native primitives if the actual context requires this, the following expression is also legal if you compile to managed code: int* pi = new int(0); When a local variable is supposed to refer to an object on the GC heap, a simple native pointer is not sufficient The following line of code is illegal: int* pi = gcnew int(0); A native pointer could easily be copied into an unmanaged memory location The copied pointer would be outside of the runtime s control.

One of the primary reasons the Session Fa ade pattern was invented was to reduce the number of remote calls for previous EJB incarnations, and this still holds true for EJB 3. In EJB 2 entity beans were remotely accessible by the clients. However, the remoteness comes at a price namely reduced performance and tight coupling of clients with domain data. With a session bean fa ade, you can

Most developers are understandably ambivalent about a major upcoming release such as WCF. On the one hand, we welcome advancements in technology and the improvements in functionality and productivity that it will hopefully bring. On the other hand, we dread having to learn a new way of doing things, and we wonder whether we will be able to migrate our existing code to the new infrastructure. These are valid concerns, especially with WCF. But the issue is less about WCF changing things than it is about things needing to change. Developers today are faced with multiple and often competing technologies for building distributed applications, including the classic choice between XML Web services vs. .NET Remoting. Certainly, there are cases where there is no overlap and no ambivalence and where one technology is clearly the better choice than another. But these technologies share too much in common to be treated differently. They are simply variations of the same technology. In the case of XML Web services and .NET Remoting, they are both concerned with remote distributed object and service invocation over a defined transport channel. Microsoft is starting to address developer concerns by providing guidelines for how to get ready for WCF. It is already making sure to bring this topic up at professional conferences, and it will certainly continue to do so until the release of WCF. There has simply been too much investment in existing technologies for it not to. WCF is obviously not a replacement for the entire set of .NET Framework functionality. Instead, it is focused on supporting distributed service-oriented applications with security, transaction support, and reliable messaging. WCF primarily extends four core technologies that are available today: