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Figure 10-9. Mapping your first service If the ESL could skip the DSL, you would lose a fundamental layer of abstraction, and the ESL would then have to know about the physical deployment details of the applications in the Application Service Layer (ASL). This not only increases the amount of maintenance that needs to happen each time a change is made to a physical application deployment (a server is added or deleted), but also eliminates a key layer of transformation. This forces the ESL to speak the same language as the application, therefore reducing the possibility of ever achieving a canonical service model at the ESL. This leads us to ESM Rule 2: Enterprise Service Mapping Rule 2: The Enterprise Service Layer cannot skip the Domain Service Layer.

A marker must not attempt to reference a value at a position beyond the length of the list of substitution values. If it does, it will not produce a compile error but a runtime error (called an exception). For example, in the following statement there are two substitution values, with positions 0 and 1. The second marker, however, references position 2 which does not exist. This will produce a runtime error. Position 0 Position 1 Console.WriteLine("Two integers are {0} and {2}.", 3, 6); // Error! There is no position 2 value.

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You have already seen single-line comments, so here I ll discuss the second type of inline comments delimited comments and mention a third type called documentation comments. Delimited comments have a start marker and an end marker. Text between the matching markers is ignored by the compiler. Delimited comments can span any number of lines. For example, the following code shows a delimited comment spanning multiple lines. Beginning of comment spanning multiple lines /* This text is ignored by the compiler. Unlike single-line comments, delimited comments like this one can span several lines. */ End of comment A delimited comment can also span just part of a line. For example, the following statement shows text commented out of the middle of a line. The result is the declaration of a single variable, var2. Beginning of comment int /*var 1,*/ var2; End of comment

Each respective domain service then makes use of any number of application services and Relational Database Management System (RDBMS) services to fulfill its service contract. In this case, we see that the Customer DSL can skip the application layer and access the RDBMS Service Layer (RSL) directly. That is because a data service and an application service are components of the domain itself. Domain services must understand the physical deployment nature of their applications, databases, and services, so it s completely acceptable for a DSL-level service to invoke any service within its domain directly. In the case of the AR/AP domain service, the Customer DSL simply uses an application service. This is often the case with packaged applications, where they either don t publish their supporting database structure, or they prohibit you from making calls to the application database directly. Each higher-level service may be dependent on lower-level services. The SOA Coordinate System makes the direction of these dependencies implicit. The ESL calls the DSL. The DSL in turn, calls the ASL or the RSL. The ASL may also call the RSL. We ll cover this later in the chapter in the section Communication Principles and Patterns.

You must load the JDBC driver and create a connection to that database before you can execute any SQL statements. The JDBC driver for Derby is in the derby.jar file that was added to your project s build path during Derby s installation. Be careful: you must remember to close that connection (whether an exception is raised or not). Connections are a costly resource if they aren t closed after use, the application will run out of them and stop working: Class.forName("org.apache.derby.jdbc.EmbeddedDriver"); Connection connection = DriverManager.getConnection( "jdbc:derby://localhost:1527/BookShopDB", "book", "book"); try { // Using the connection to query or update database } finally { connection.close(); }

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