NAME

       PosixSignalDispatcher -

SYNOPSIS

       #include <PosixSignalDispatcher.h>

   Classes
       class CannotAttachHandler
           Exception thrown when AttachHandler() fails due to a runtime error.
       class CannotDetachHandler
           Exception thrown when DetachHandler() fails due to a runtime error.

   Public Member Functions
       void AttachHandler (const int posixSignalNumber, PosixSignalHandler &signalHandler)  throw (
           CannotAttachHandler )
           Attach a signal handler to the signal dispatcher.
       void DetachHandler (const int posixSignalNumber, const PosixSignalHandler &signalHandler)  throw (
           CannotDetachHandler,               std::logic_error )
           Detach the specified signal handler from the signal dispatcher.

   Static Public Member Functions
       static PosixSignalDispatcher & Instance ()
           This is a singleton class and there is only one instance of this class per process.

   Private Member Functions
       PosixSignalDispatcher ()
           This is a singleton class and the only instances of this class can only be accessed using the
           Instance() method.
       ~PosixSignalDispatcher ()
           This class cannot be subclassed.
       PosixSignalDispatcher (const PosixSignalDispatcher &otherInstance)
           Copying of an instance of this class is not allowed.
       const PosixSignalDispatcher & operator= (const PosixSignalDispatcher &otherInstance)
           Copying of an instance of this class is not allowed.

Detailed Description

       Note:
           The signal dispatcher will not interfere with any signals for which there are no signal handlers
           attached. Similarly, if a signal handler function is already attached to a signal that the dispatcher
           is asked to administer, that signal handler will be called after all the attached
           PosixSignalHandlers.

       Todo
           Make this a singleton class.

       Definition at line 33 of file PosixSignalDispatcher.h.

Constructor & Destructor Documentation

   PosixSignalDispatcher::PosixSignalDispatcher () [private]
       This is a singleton class and the only instances of this class can only be accessed using the Instance()
       method. This is enforced by making the default constructor a private member disalloweing construction of
       new instances of this class

   PosixSignalDispatcher::~PosixSignalDispatcher () [private]
       This class cannot be subclassed. We enforce this by making the destructor a private member.

   PosixSignalDispatcher::PosixSignalDispatcher (const PosixSignalDispatcher &otherInstance) [private]
       Copying of an instance of this class is not allowed. We enforce this by making the copy constructor and
       the assignment operator private members.

Member Function Documentation

   void PosixSignalDispatcher::AttachHandler (const intposixSignalNumber, PosixSignalHandler
       &signalHandler)CannotAttachHandler
       Attach a signal handler to the signal dispatcher. The signal handler's HandlePosixSignal() method will be
       called every time the specified signal is received. The signal handler should not be destroyed while it
       attached to the signal dispatcher. Otherwise, weird things are bound to happen (i.e. 'undefined behavior'
       shall ensue). Make sure you call DetachHandler() from the destructor of the signal handler.

       If a PosixSignalHandler is attached to the same signal number multiple times, it will be called multiple
       times. Furthermore, it should also be detached as many times as it was attached before it is destroyed.
       Otherwise, undefined behavior may result.

       Parameters:
           posixSignalNumber The signal number that will result in call to the HandlePosixSignal() method of the
           signal handler.
           signalHandler The signal handler to be invoked on receiving a posixSignalNumber signal.

   void PosixSignalDispatcher::DetachHandler (const intposixSignalNumber, const PosixSignalHandler
       &signalHandler) CannotDetachHandler,std::logic_error
       Detach the specified signal handler from the signal dispatcher. The signal handler will stop being called
       on receiving the corresponding POSIX signal. If the signal handler is not attached to the signal
       dispatcher when this method is called then this method has no effect.

       Parameters:
           posixSignalNumber The signal number corresponding to the signal handler.
           signalHandler The signal handler to be detached.

   static PosixSignalDispatcher& PosixSignalDispatcher::Instance () [static]
       This is a singleton class and there is only one instance of this class per process. This instance can be
       obtained using the GetInstance() method.

   const PosixSignalDispatcher& PosixSignalDispatcher::operator= (const PosixSignalDispatcher &otherInstance)
       [private]
       Copying of an instance of this class is not allowed. We enforce this by making the copy constructor and
       the assignment operator private members.

Author

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