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messages can be sent to this service even when the client isn t running A persistent queue, implemented by MSMQ or tables in a relational database, is a good mechanism to facilitate communication between a client and service; the two may be temporarily disconnected from each other Implementing a self-hosted service is very straightforward The three steps are listed in Listing 71 The host, the program that creates the object and calls its method, is responsible for staying alive until it s time to shut down There are a few options when creating the , such as where to get the server base address from and whether to create a singleton, but that s about it Listings 11 and 12 in 1 demonstrate the bare minimum for selfhosting a service Those listings show self-hosting from a console application that could be run on the console of a server or on an administrator desktop

In addition to these areas, the MIDP Specification defines an extension of the CLDC application model that allows for the execution and communication of applications called MIDlets A MIDlet is the basic unit of execution in MIDP One or more MIDlets packaged together are called a MIDlet suite The MIDP application model and each of the areas mentioned above are discussed in detail in the subsequent chapters of this book The concept of a MIDlet suite is discussed in detail in Section 191, "MIDlet Suites"

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With the Ord class available, we can create an instance, ord = Ord(), and then have an alternative to the built-in ord() function that works for any character that is a valid identi er For example, orda returns 97, ordZ returns 90, and ord returns 229 (But ord! and similar are syntax errors) Note that if we typed the Ord class into IDLE it would not work if we then typed ord = Ord() This is because the instance has the same name as the built-in ord() function that the Ord class uses, so the ord() call would actually become a call to the ord instance and result in a TypeError exception The problem would not arise if we imported a module containing the Ord class because the interactively created ord object and the built-in ord() function used by the Ord class would be in two separate modules, so one would not displace the other If we really need to create a class interactively and to reuse the name of a built-in we can do so by ensuring that the class calls the built-in in this case by importing the builtins module which provides unambiguous access to all the built-in functions, and calling builtinsord() rather than plain ord() Here s another tiny yet complete class This one allows us to create constants It isn t dif cult to change the values behind the class s back, but it can at least prevent simple mistakes

class Const: def __setattr__(self, name, value): if name in self__dict__: raise ValueError("cannot change a const attribute") self__dict__[name] = value def __delattr__(self, name): if name in self__dict__: raise ValueError("cannot delete a const attribute") raise AttributeError("'{0}' object has no attribute '{1}'" format(self__class____name__, name))

With this class we can create a constant object, say, const = Const(), and set any attributes we like on it, for example, constlimit = 591 But once an attribute s value has been set, although it can be read as often as we like, any attempt to change or delete it will result in a ValueError exception being raised We have not reimplemented __getattr__() because the base class object__getattr__() method does what we want returns the given attribute s value or raises an AttributeError exception if there is no such attribute In the __delattr__() method we mimic the __getattr__() method s error message for nonexistent attributes, and to do this we must get the name of the class we are in as well as

Managed Windows services are operating system processes that are controlled by the Service Control Manager (SCM) They are administered using the Services Microsoft Management Console (MMC), but Windows Management Instrumentation (WMI) and SCM APIs make them available to other con guration tools and scripting Through these tools you can con gure a variety of features, such as whether they start automatically with the OS and the Windows identity in which they run Windows services are a common hosting environment for enterprise applications such as Microsoft SQL Server and Microsoft Exchange The managed Windows service infrastructure, available in unmanaged in the code via Win32 APIs and managed code derived from namespace, provides a basic administration interface but does nothing for the actual hosting, scaling, security, and reliability of your code You are responsible for implementing all communication (MSMQ, named pipes, TCP, and so on) as well as threading, instancing, and throttling Fortunately, those features are implemented in WCF, so when you host a WCF service in a Windows service, this is done for you

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