By Douglas C. Schmidt, Stephen D. Huston
C++ community Programming, quantity 2, makes a speciality of ACE frameworks, supplying thorough insurance of the suggestions, styles, and utilization ideas that shape their constitution. This booklet is a pragmatic advisor to designing object-oriented frameworks and exhibits builders the best way to observe frameworks to concurrent networked functions. C++ Networking, quantity 1, brought ACE and the wrapper facades, that are uncomplicated community computing parts. quantity 2 explains how frameworks construct on wrapper facades to supply higher-level verbal exchange services.
Written via specialists within the ACE group, this e-book contains:
An evaluation of ACE frameworks
Design dimensions for networked services
Descriptions of the foremost features of an important ACE frameworks
Numerous C++ code examples that display easy methods to use ACE frameworks
C++ community Programming, quantity 2, teaches the right way to use frameworks to write down networked purposes fast, decreasing improvement attempt and overhead. will probably be a useful asset to any C++ developer engaged on networked purposes.
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Extra resources for C++ Network Programming: Systematic Reuse With ACE and Frameworks
Its use of objects also automates the binding of an event source (or set of sources) with data the event source is associated with, such as a network session. • It centralizes how event handlers can be destroyed when they're not needed. • It holds a pointer to the ACE_Reactor that manages it, making it simple for an event handler to manage its event (de)registration correctly. 3 and its key methods are outlined in the following table: Applications can inherit from ACE_Event_Handler to create event handlers that have the following properties: • They override one or more of the ACE_Event_Handler class's handle_*() hook methods to perform application-defined processing in response to the corresponding types of events.
Sidebar 9: Idioms for Designing ACE Event Handlers The following are some idioms for designing event handlers for use with the ACE Reactor framework: ♦ To prevent starvation, keep the execution time of an event handler's handle_*() hook methods short, ideally shorter than the average interval between event 48 49 occurrences. If a hook method may run for a long time processing a request, consider queueing the request in an ACE_Message_Queue and processing it later. 3 illustrates this approach by combining the ACE Task framework with the ACE Reactor framework to implement a concurrent logging server based on the Half-Sync/Half-Async pattern.
Some common network applications, such as FTP and TELNET, don't require retention of persistent application state information between consecutive service invocations. These stateless services are generally fairly simple to configure and reconfigure reliably. Conversely, the CORBA Naming Service [Obj98] is a common middleware service that manages various bindings whose values may need to be retained even if the server containing the service crashes. If preserving state across failures is paramount to system correctness, you may need to use a transaction monitor [GR93] or some type of active replication [BvR94].