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Writing a Service with Code and Configuration Files WCF provides rich support for de ning service attributes in con guration les You still need to code the feature or algorithm you re exposing in the service, but endpoint addressing, bindings, and behaviors can be moved from the code into con guration les De ning endpoints and behaviors in con guration les makes for a much more exible solution when compared with de ning this in code For example, suppose that an endpoint was implemented to communicate with clients via HTTP In Listing 11, this is implemented by specifying in the call to But suppose that , which delivers better you d like to change the binding to security by implementing message-level in addition to transport-level security In that case, you d need to change and recompile the code By moving the binding selection from code to con guration, this change can be made without a recompile Or, if you d like to expose the contract over both protocols, you can de ne two endpoints: one for basic HTTP and the other that uses WS-Security without changing code This makes the code more manageable Listing 12 shows the complete code for a WCF service that is hosted in a console application This code requires a con guration le that de nes behavior and endpoint information In this example, we do the following

[ Team LiB ]

this occurs and if the as variable part is given, then inside the exception-handling suite, variable refers to the exception object If an exception occurs in the handling except block, or if an exception is raised that does not match any of the except blocks in the rst place, Python looks for a matching except block in the next enclosing scope The search for a suitable exception handler works outward in scope and up the call stack until either a match is found and the exception is handled, or no match is found, in which case the program terminates with an unhandled exception In the case of an unhandled exception, Python prints a traceback as well as the exception s message text Here is an example:

s = input("enter an integer: ") try: i = int(s) print("valid integer entered:", i) except ValueError as err: print(err)

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De ne the contract Write a NET class that does something useful and decorate it with WCF attributes There is no difference in a service de nition, whether it is exposed in code or con guration Listing that is identical to Listing 11 12 uses a class named Host the service in an operating system process so it can be accessed by a client on the network This is done by creating a object de ned in namespace method, as it was in Listing 11 and calling its De ne a con guration le that speci es the base address for a service and the ABCs of the service endpoint Note that the code in Listing 12 does not reference the con guration le When the method is called, WCF looks in the applior ) for the cation s con guration le ( to apply the con guration data

[ Team LiB ]

If the user enters 35 , the output will be:

invalid literal for int() with base 10: '35'

But if they were to enter 13 , the output will be:

Listing 13 shows the complete con guration le that works with the code section, de ne the endpoint For each endin Listing 11 In the point, de ne the address, binding, and contract The address is blank, which indicates that the endpoint address is the same as the base address for the service If there is more than one endpoint, each endpoint must have a unique and the contract name address The binding in this case is is the class name de ned in the source code,

22 Java 2 Platform, Micro Edition (J2ME)

valid integer entered: 13

Many books consider exception-handling to be an advanced topic and defer it as late as possible But raising and especially handling exceptions is fundamental to the way Python works, so we make use of it from the beginning And as we shall see, using exception handlers can make code much more readable, by separating the exceptional cases from the processing we are really interested in

Python provides a full set of arithmetic operators, including binary operators for the four basic mathematical operations: + addition, - subtraction, * multiplication, and / division In addition, many Python data types can be used with augmented assignment operators such as += and *= The +, -, and * operators all behave as expected when both of their operands are integers:

More on Configuration Files The service con guration le, or depending on node how the service is hosted, must contain a Under this node, services, bindings, behaviors, clients, diagnostics, exten-

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