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In existing frame relay and ATM networks, current practice is to considerably overbook capacity (the sum of guaranteed rates may be several times greater than available capacity), counting on the fact that users do not all require their guaranteed bandwidth at the same time This allows a proportionate decrease in the bandwidth charge but, of course, there is no longer any real guarantee In addition, in these networks users are generally allowed to emit traf c at a rate over and above their guaranteed bandwidth This excess traf c, ``tagged'' to designate it as expendable in case of congestion, is handled on a best effort basis using momentarily available capacity Undeniably, the combination of overbooking and tagging leads to a commercial offer that is attractive to many customers.

Adapters permit manipulations that escape subclassing rules For example, you cannot override a public method as private in a subclass in order to disable access, but you can simply fail to relay the method in an Adapter Various forms of delegation can even be used as a substitute of sorts for subclassing by having each "sub" class (Adapter) hold a reference to an instance of its "super" class (Adaptee), forwarding it all "inherited" operations Such Adapters often have exactly the same interfaces as their delegates, in which case they are considered to be simple kinds of Proxies Delegation can also be more flexible than subclassing, since "sub" objects can even change their "supers" (by reassigning the delegate reference) dynamically Delegation can also be used to obtain the effects of multiple code inheritance For example, if a class must implement two unrelated interfaces, say Tank and javaawteventActionListener, and there are two available superclasses providing the needed functionality, then one of these may be subclassed and the other delegated

if (iProperties.Append("Extension", "winsgui;elocd.ldd;medint.pdd;medlfs.pdd; epbusv.dll;mednand.pdd") == NULL) return KErrNoMemory;

It does, however, lead to an imprecision in the nature of the offered service and in the basis of charging, which may prove unacceptable as the multiservice networking market gains maturity In the present chapter, we have sought to establish a more rigorous basis for network engineering where quality of service guarantees are real and veri able..

This leads us to ignore the advantages of considering an aggregation as a single traf c entity and to require that individual stream and elastic ows be recognized for the purposes of admission control and routing. In other words, transparency, throughput, and accessibility are guaranteed on an individual ow basis, not for the aggregate. Of course, it remains useful to aggregate traf c within the network and ows of like characteristics can share buffers and links without the need to maintain detailed state information. 16.3 OPEN-LOOP CONTROL

The emulator-speci c parts of the kernel that would be responsible for loading extensions from ROM on target hardware are then able to read this string and explicitly load each DLL in the order it appears in the list. You should modify this list if you are developing extensions that need to be loaded into the emulator. The code can be found in the Wins::InitProperties() function in the source le \wins \specific\property.cpp.

However, delegation is less powerful than subclassing in some other respects For example, self-calls in "superclasses" are not automatically bound to the versions of methods that have been "overridden" in delegation-based "subclasses" Adapter designs can also run into snags revolving around the fact that the Adaptee and Adapter objects are different objects For example, object reference equality tests must be performed more carefully since a test to see if you have the Adaptee version of an object fails if you have the Adapter version, and vice versa Most of these problems can be avoided via the extreme measure of declaring all methods in Adaptee classes to take an "apparent self" argument referring to the Adapter, and always using it instead of this, even for self-calls and identity checks (for example by overriding Objectequals) Some people reserve the term delegation for objects and classes written in this style rather than the forwarding techniques that are almost always used to implement simple Adapters 1431 Template methods When you are pretty sure that you are going to rely on before/after control in a set of related classes, you can create an abstract class that automates the control sequence via an application of the Template Method pattern (which has nothing to do with C++ generic types)

In this and the next section we discuss traf c control options and their potential for realizing quality of service guarantees. Here we consider open-loop, or preventive, traf c control based on the notion of ``traf c contract'': a user requests a communication described in terms of a set of traf c parameters and the network performs admission control, accepting the communication only if quality of service requirements can be satis ed. Either ingress policing or service rate enforcement by scheduling in network nodes is then necessary to avoid performance degradation due to ows that do not conform to their declared traf c descriptor. 16.3.1 Multiplexing Performance

In this section I will explain some of the most common uses of extensions within Symbian OS. Many extensions such as the power framework, peripheral bus and USB controllers provide asynchronous services for multiple clients which are usually other extensions and device drivers. The following code demonstrates a common pattern that is used to provide such an interface using an extension. The interface is usually exported from the extension via a simple static interface class. In this example, the DoIt() function will perform some