By Douglas C. Schmidt, Stephen D. Huston
As networks, units, and structures proceed to conform, software program engineers face the original problem of making trustworthy dispensed functions inside usually altering environments. C++ community Programming, quantity 1, offers functional strategies for constructing and optimizing advanced dispensed platforms utilizing the ADAPTIVE verbal exchange surroundings (ACE), a innovative open-source framework that runs on dozens of structures and working structures. This publication publications software program execs throughout the traps and pitfalls of constructing effective, transportable, and versatile networked functions. It explores the inherent layout complexities of concurrent networked purposes and the tradeoffs that needs to be thought of whilst operating to grasp them.C++ community Programming starts with an summary of the problems and instruments curious about writing disbursed concurrent functions. The ebook then offers the fundamental layout dimensions, styles, and rules had to strengthen versatile and effective concurrent networked purposes. The book's professional writer workforce indicates you ways to reinforce layout abilities whereas using C++ and styles successfully to enhance object-oriented networked applications.Readers will locate insurance of:C++ community programming, together with an summary and techniques for addressing universal improvement demanding situations The ACE ToolkitConnection protocols, message alternate, and message-passing as opposed to shared memoryImplementation equipment for reusable networked program servicesConcurrency in object-oriented community programmingDesign ideas and styles for ACE wrapper facadesWith this ebook, C++ builders have at their disposal the main whole toolkit to be had for constructing profitable, multiplatform, concurrent networked functions comfortably and potency.
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Additional resources for C++ Network Programming, Volume I: Mastering Complexity with ACE and Patterns
11-14) Although these lines look harmless enough, they are also fraught with peril. This code isn't portable to Windows Sockets (WinSock) platforms, where socket handles are type SOCKET, not type int. Moreover, WinSock failures are indicated via a non-standard macro called INVALID_SOCKET_HANDLE rather than by returning -1. The other bugs in the code fragment above aren't obvious until we examine the rest of the function. The next three network addressing errors are subtle, and show up only at run time.
To avoid duplication of code, common methods and state are factored into abstract classes, which aren't instantiated directly. Subclasses then add appropriate methods and enforce proper usage patterns. For example, connection-oriented networked applications are typified by asymmetric connection roles between clients and servers. 3. Even in peer-to-peer applications, in which applications play the role of both client and server, connections must be initiated actively by one of the peers and accepted passively by the other.
Virtual methods are usually invoked using an indirect call through a table of function pointers (a vtable) located in the object's memory. A shared memory region may reside at a different virtual memory location in each process that maps it (BC94, Jor91). Moreover, a C++ compiler/linker needn't locate vtables at the same address in separate processes. The vtable, as well as the functions it refers to, may therefore be mapped at different virtual addresses in each process, which guarantees problems at run time.