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Retrieving a preexisting object is very similar to the creation process just discussed. Again, a Criteria object is used to provide the data that the object will use to find its information in the database. The Criteria class is nested within the business object class and/or inherits from CriteriaBase, so the server-side data portal code can determine the type of business object desired and then use reflection to create an instance of the class. The UML sequence diagram in Figure 2-17 illustrates all of this.

You can choose to pass a mobile object by value, in which case it s passed one way: from the caller to the method. Or you can choose to pass a mobile object by reference, in which case it s passed two ways: from the caller to the method and from the method back to the caller. If you want to get back any changes the method makes to the object, use by reference. If you don t care about or don t want any changes made to the object by the method, use by value.

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IN A SERVICE-ORIENTED ARCHITECTURE (SOA), the purpose of Web services is to exchange and process XML messages, not simply to act as hosts for Remote Procedure Call (RPC) style methods. The difference is that messages are bound to rich and complex operations, whereas RPC-style methods simply return a discrete result that is directly correlated to a specific set of input parameters. For example, a message-oriented Web method will accept a stock ticker symbol and will return a detailed stock quote in response. In contrast, an RPC-style Web method will return a simple output value. Unfortunately, development tools such as Visual Studio .NET place a methodcentric focus on Web services that causes you to lose sight of the bigger design picture and to take the underlying infrastructure for granted. It is very easy to build a Web service by creating an .asmx file and then throwing together several loosely related RPC-style Web method implementations. However, this is the wrong design approach because such a Web service fails to provide an integrated set of message endpoints. In simpler terms, the Web service fails to provide a service. The right design approach is always to think in terms of operations and XML messages, and to consider how the Web service methods work together to provide a service. This chapter begins with a challenge for you to set aside what you have learned about Web services development until now, and to open your mind to a different design approach one that is based on integrated XML messages, not on RPC-style methods.

The reverse is true as well: an object may start out invalid (perhaps because a required field is blank), so the user must edit data until it becomes valid If the user later cancels the object (or its parent, grandparent, and so on), the object must become invalid once again because it will be restored to its original invalid state Fortunately, this is easily handled by treating the broken rules and validity of each object as part of that object s state When an undo operation occurs, not only is the object s core state restored but so is the list of broken rules associated with that state The object and its rules are restored together N-level undo is a perfect example of complex code that shouldn t be written into every business object.

if, each session, a different person from the group present something new that they learned regarding Oracle that week It doesn t have to be an advanced topic, per se Just something about Oracle that is new to you Then if other members of the group are familiar with the topic being presented, they can add their own tidbits to help pad the discussion Inevitably, the next question was Well, can we also hold one for Java You knew that was coming And I replied, Of course Let s just choose a different day for that one So twice a week we met for lunch, one day devoted to presentations regarding Oracle, and the other to presentations on Java And it wasn t long before conversations turned to comparisons of different processes and how they performed in Oracle vs when coded in Java.

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