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The drawbacks of exception handling are particularly problematic for wrapper facades that encapsulate kernel-level device drivers or low-level operating system APIs that must run on many platforms [Sch92], such as the mutex, Socket and thread wrapper facades described above. A common error handling mechanism for system-level wrapper facades [Sch97] is based on the Thread-Specific Storage pattern (475) in conjunction with errno. This solution is efficient, portable, and thread-safe, though more obtrusive and potentially error-prone than using C++ exceptions. 8. Define related helper classes (optional). After lower-level APIs are encapsulated within wrapper facade classes it often becomes possible to create other helper classes that further simplify application development. The benefits of these helper classes are often apparent only after the Wrapper Facade pattern has been applied to cluster lower-level functions and their associated data into classes.

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(6.8)

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Management component includes compile-time as well as run-time con ict resolvers The core functionality of the Policy Management component is performed by the Policy Decision Point, or PDP The PDP controls the functioning of the remainder of the network management components These include Fault and Performance management components, which monitor the network and receive fault noti cations from network elements; the Con guration management component, which con gures the network elements and veri es that they are correctly con gured; the Security management component, which con gures security devices and performs intrusion detection and generates security alerts; and nally, the QoS management component, which is a subset of the Performance management functionality and performs admission control on network traf c ows that require QoS Each of these FCAPS components implements actions that can be triggered by the Policy Management component.

They also generate different types of events that can trigger policies The Fault Management component generates root cause events; these events are sent to the Policy Management component, where they may trigger policies that recon gure the network This recon guration is accomplished by invoking actions implemented by the Con guration Management component The Con guration Management component periodically conducts audits of the network elements, to verify that they are con gured according to the latest stored information; if there is a discrepancy, con guration audit events are generated The Security Management component performs intrusion detection and generates security alerts when intrusions are detected; these alerts are sent to the Fault Management component for further root cause analysis and correlation with other network alarms Finally, any communication with network elements is performed via network adaptors that hide vendor-speci c interface details from the FCAPS components.

The entire network management system depicted above will be referred to as the NMS (Network Management System) The next section discusses the deployment of the NMS 5232 Distribution of Management Functionality The rst and foremost question is that of distribution The architecture in Figure 54 shows one centralized NMS and multiple network elements managed by that NMS This architecture is commonly used in small and medium-sized wireline networks, where one central management station uses SNMP polling to gather device status and also listens for traps from network nodes This may not be the best solution from the point of view of survivability and robustness.

In place of the NSString and NSMutableString that you would use in your iPhone OS code, you should use Qt s QString, which is based on QChar, a 16-bit character type used to store a Unicode character. Differences between QString and NSString and NSMutableString include: Wherever QString methods accept const char*, they are treated by default as C-style ASCII character strings (this behavior can be changed by calling the QTextCodec::setCodecForString() static method), whereas in Cocoa you are expected to specify the encoding. QString uses implicit sharing with copy on write (see 6); with NSMutableString, a developer can decide based on the situation whether to spawn a copy or just increase the reference count. A QString is best created on the stack, like a fundamental type. Returning QString by value is ne too as the copy constructor just increases the reference count on the shared data to which the QString object holds a pointer. QString makes use of the C++ language features operator overloading and implicit conversion. As a result, you end up with simpler and more readable code than you typically get with Cocoa.

For a MANET, in particular, a centralized solution with one NMS managing the entire network would bring the network to its knees due to the amount of over-the-air communications required between the NMS and network elements! Furthermore, this architecture is de nitely not survivable, as it has a single point of failure As mentioned in Section 513, one of the foremost issues to be addressed by a network management system for ad hoc networks is the scarcity of band-.

In both frameworks, application initialization is done for you when you create a new project. You hardly ever have to change the way this is done. In UIKit, the following code does the initialization:

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