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When shell functions were introduced in the KornShell, the definition syntax was as follows: function name <compound command> When the Bourne shell added functions in 1984, the syntax (which was later included in ksh and adopted by the POSIX standard) was as follows: name() <compound command> Bash allows either syntax as well as the hybrid: function name() <compound command> The following is a function that I wrote several years ago and that, I recently discovered, is included as an example in the bash source code package. It checks whether a dotted-quad Internet Protocol (IP) address is valid. In this book, we always use the POSIX syntax for function definition: isvalidip()

Employee Age getter is called Advice AfterInvoke is called Intercepted method is get Age Employee Bob is 30 years old Next, let s turn it up a notch by throwing in a second advice object By having a second advice object, we ll be able to order the two advice objects in different ways and see the effects To make the demonstration clear, I created a new advice class by copying the LoggingAdvice class and renaming it to LoggingAdvice2 Listing 7-14 shows the code of LoggingAdvice2 with differences from LoggingAdvice in bold As you can see, LoggingAdvice2 differs from LoggingAdvice only in the messages it prints to the console Because the messages are different, it will be easy to see which advice object is in front of which in the advice chain later when we run the example Listing 7-14 LoggingAdvice2.

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Loading Data Perhaps the strongest argument against manually creating your own data access layer is the amount of work necessary to map the data from the database to the objects Object/Relational (O/R) mapping has been a common problem since objects have been used in combination with relational databases The impedance mismatch between these generally incompatible systems requires you to understand how both ends are constructed so that you can use that understanding to map them together One approach to O/R mapping has been to create configuration files that explicitly set the mapping between every data column and object property Popular O/R mapping tools such as NHibernate use extensive XML configuration that defines all the mappings Many consider.

cs public class LoggingAdvice2 : IDynamicAdvice, IMethodInterceptor { //Invoke method is omitted public void BeforeInvoke(MethodInfo method, object[] args, object target) { ConsoleOutWriteLine("Advice2 BeforeInvoke is called Intercepted method is {0}", methodName); } public void AfterInvoke(object returnValue, MethodInfo method, object[] args, object target) { ConsoleOutWriteLine("Advice2 AfterInvoke is called Intercepted method is {0}", methodName); } } With LoggingAdvice2 in place, all that remains is to configure new advice and advisor objects in application-configxml Listing 7-15 shows the contents of application-configxml after the modifications The differences from the earlier version of application-configxml are highlighted in bold As you can see, a new advice object with id loggingAdvice2 and a new advisor object with id getAgeAdvisor2 are added The object loggingAdvice2 is an instance of LoggingAdvice2 As for the getAgeAdvisor2 object, notice that its order attribute is assigned the number 2.

this to be a powerful solution to the O/R mapping requirement I find that it is an extra, unnecessary layer To facilitate the O/R mapping work, I created a base class that automatically maps data columns to properties by matching up the names and types for properties that are writable Every business object populated by the data access layer inherits this base class One load method takes a DataRow while another takes an IDataReader object to set the properties With reflection, the base class compares the columns coming from the query with the properties in the business object I call this base class DomainObject The core properties it always provides are ID, Created, and Modified As I add new columns to the stored procedures, and new properties to the business objects, the values are automatically loaded into the objects without any additional effort.

In comparison, the order attribute of the getAgeAdvisor object is set to 5 That means in the advice chain, loggingAdvice2 will be in front of loggingAdvice So we should expect the BeforeInvoke method of loggingAdvice2 to be called before the BeforeInvoke method of loggingAdvice when program execution enters the advice chain When program execution exits the advice chain, we should expect the AfterInvoke method of loggingAdvice to be called first and the AfterInvoke method of loggingAdvice2 to be called second Notice also that I changed the pointcut pattern to match not only all methods that end with Age but also the ones that end with Name..

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