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This will be our last test for mapping services. Just to make sure you really understand the process, we ll make this test a whopper. Let s dive right in. Scenario: Your manager says, I need a 360-degree view of the customer. I want to be able to know at a glance the customer contact information, the products they ve purchased, and when they purchased them. I also want to know how they paid for those products so I can target a promotional campaign based on past purchases and payment methods. Furthermore, your lead developer says, Getting the product and order data would be a lot faster if we got it directly from our data warehouse, rather than from our online databases. This sounds a lot harder than it turns out to be. Figure 10-12 shows the service map for the Customer 360 View service. To begin with, there s no question that you re crossing domains with this map, so you know you need a service in the ESL. Also, you know that you ll need a service in each of the DSLs that participate in this overall service.

dll, as indicated by the dashed arrow But the application has a configuration file, which instructs the CLR to load version 2000 instead Notice that the name of the configuration file consists of the full name of the executable file including the extension, plus the additional extension config..

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Figure 10-12. Our service map for Test 2 We threw a bit of a monkey wrench into this test with the engineer s comment on using the data warehouse. A data warehouse with order information would contain product information by default. Obviously, this is an RDBMS-layer service, but in which domain: Order or Product The answer is up to you. In our opinion, this service is centered more on the order than the products, but that s a personal call. You d be just a correct to place such an RDBMS service in the Product domain. Data warehouses are like applications in that they almost always cross domain boundaries. Just like applications, it s up to you to decide which domain best fits the RDBMS service you re creating. There s no right or wrong answer here, just as long as you document your decisions and provide a mechanism to allow your development teams to find and reuse these services easily.

You use normal JavaBeans to build your object/domain model. These JavaBeans are called Plain Old Java Objects (POJOs). This term is used to distinguish them from Enterprise JavaBeans (EJBs). EJBs are Java objects that implement one of the javax.ejb interfaces and that need to be deployed in an EJB container. Note that each of these POJOs must have a no-argument constructor: public class Publisher { private String code; private String name; private String address; // Getters and Setters } public class Book { private String isbn; private String name; private Publisher publisher; private Date publishDate; private int price; private List chapters; // Getters and Setters } public class { private int index; private String title; private int numOfPages; // Getters and Setters } You use a foreign key to reference PUBLISHER from the BOOK table, but it s a many-to-one association represented with a list of chapters in the Book class. You use a foreign key to reference BOOK from the CHAPTER table, but there s nothing referencing the Book class from the class. In contrast, a Book object has a list of objects (one-to-many association). This is a case of an objectrelational mismatch, which focuses on the association between two classes or tables in their corresponding model. To handle the incompatibility of these models, you need to do some conversion/translation when you retrieve and save your object model. This is called object/relational mapping (O/R Mapping or ORM). Let s say your Bookshop sells audio and video discs. In the object-oriented model, this can be represented by using a Disc superclass and two subclasses called AudioDisc and VideoDisc (see Figure 1-4). On the relational database side, you don t have a way to map this inheritance relationship. This is a major object-relational system mismatch.

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