By Douglas C. Schmidt, Stephen D. Huston

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Only call delete this in an event handler's handle_close() method, and only after the handler's final registered event has been removed from the reactor. This idiom avoids dangling pointers that can otherwise occur if an event handler that registered with a reactor for multiple events is deleted prematurely. Sidebar 10 (page 53) illustrates one way to keep track of this information. • Return value greater than 0 also indicates that the reactor should continue to detect and dispatch the registered event for this event handler.

Bottlenecks may result if many services are configured into a server application and too many active clients access these services simultaneously. Conversely, configuring many services into clients can result in a bottleneck if clients execute on cheaper, less powerful machines. Logging service Our networked logging service implementations in C++NPv1 and in Chapters 3 and 4 of this book are configured statically. In Chapter 5 of this book, we describe ACE_DLL, which is a portable wrapper facade that encapsulates the ability to load/unload shared libraries (DLLs) dynamically and find symbols in them.

By separating application-independent event demultiplexing and dispatching mechanisms from application-dependent event processing policies, the ACE Reactor framework provides the following benefits: • Broad portability. The framework can be configured to use many OS event demultiplexing mechanisms, such as select() (available on UNIX, Windows, and many real-time operating systems), /dev/poll (available on certain UNIX platforms), and WaitForMultipleObjects() (available only on Windows). • Automates event detection, demultiplexing, and dispatching.

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C++ Network Programming Volume II - Systematic Reuse with ACE and Frameworks by Douglas C. Schmidt, Stephen D. Huston

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