Enable a class that doesn't inherit from the ACE_Event_Handler to be incorporated into the ACE_Reactor framework. Thanks to Greg Lavender (g.lavender@isode.com) for sharing this idea. More...

#include <Event_Handler_T.h>

Inheritance diagram for ACE_Event_Handler_T< T >:

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Collaboration diagram for ACE_Event_Handler_T< T >:

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List of all members.

Public Types
typedef ACE_HANDLE(T::*	GET_HANDLE )(void) const
typedef void(T::*	SET_HANDLE )(ACE_HANDLE)
typedef int(T::*	IO_HANDLER )(ACE_HANDLE)
	Handle I/O events.
typedef int(T::*	TO_HANDLER )(const ACE_Time_Value &, const void *)
	Handle timeout events.
typedef int(T::*	CL_HANDLER )(ACE_HANDLE, ACE_Reactor_Mask)
	Handle close events.
typedef int(T::*	SIG_HANDLER )(int, siginfo_t , ucontext_t )
	= Initialization and termination methods.
Public Member Functions
	ACE_Event_Handler_T (T *op_handler, int delete_handler, GET_HANDLE get_handle=0, IO_HANDLER input=0, CL_HANDLER close=0, SIG_HANDLER sig=0, TO_HANDLER timeout=0, IO_HANDLER output=0, SET_HANDLE set_handle=0, IO_HANDLER except=0)
	Initialize the op_handler.
	~ACE_Event_Handler_T (void)
	Close down and delete the <op_handler>
virtual ACE_HANDLE	get_handle (void) const
	Get the I/O handle.
virtual void	set_handle (ACE_HANDLE)
	Set the I/O handle.
virtual int	handle_input (ACE_HANDLE fd=ACE_INVALID_HANDLE)
	Called when input events occur (e.g., connection or data).
virtual int	handle_output (ACE_HANDLE fd=ACE_INVALID_HANDLE)
virtual int	handle_exception (ACE_HANDLE fd=ACE_INVALID_HANDLE)
	Called when an exceptional events occur (e.g., SIGURG).
virtual int	handle_timeout (const ACE_Time_Value &tv, const void *arg=0)
virtual int	handle_close (ACE_HANDLE fd, ACE_Reactor_Mask close_mask)
virtual int	handle_signal (int signum, siginfo_t =0, ucontext_t =0)
T *	op_handler (void)
void	op_handler (T *)
GET_HANDLE	handle_get (void)
void	handle_get (GET_HANDLE)
SET_HANDLE	handle_set (void)
void	handle_set (SET_HANDLE)
IO_HANDLER	input_handler (void)
void	input_handler (IO_HANDLER)
IO_HANDLER	output_handler (void)
void	output_handler (IO_HANDLER)
IO_HANDLER	except_handler (void)
void	except_handler (IO_HANDLER)
TO_HANDLER	to_handler (void)
void	to_handler (TO_HANDLER)
CL_HANDLER	cl_handler (void)
void	cl_handler (CL_HANDLER)
SIG_HANDLER	sig_handler (void)
void	sig_handler (SIG_HANDLER)
void	dump (void) const
	Dump the state of an object.
Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks.
Protected Attributes
T *	op_handler_
	Pointer to the object that handles all the delegated operations.
IO_HANDLER	input_handler_
IO_HANDLER	output_handler_
IO_HANDLER	except_handler_
TO_HANDLER	to_handler_
	Handle timeout events.
CL_HANDLER	cl_handler_
	Handle close events.
SIG_HANDLER	sig_handler_
	Handle signal events.
int	delete_handler_
SET_HANDLE	set_handle_
GET_HANDLE	get_handle_

Detailed Description

template<class T>
class ACE_Event_Handler_T< T >

Enable a class that doesn't inherit from the ACE_Event_Handler to be incorporated into the ACE_Reactor framework. Thanks to Greg Lavender (g.lavender@isode.com) for sharing this idea.

It is sometimes the case that an application has a hierarchy of operation dispatcher classes that have their own inheritance hierarchy but also would like to integrate with the ACE_Reactor. Rather than adopt a "mixin" approach, it is often cleaner to define a template as a subclass of ACE_Event_Handler and parameterize it with an operation dispatcher type. When constructing an instantiation of the ACE_Event_Handler_T object, a set of pointers to member functions must be provided so that when one of the handle_* methods is called by the ACE_Reactor, the appropriate method is called on the underlying operations object. This is done since in some cases it is useful to map any event that happens to the same method on an object. The ACE_Event_Handler_T template is instantiated by an operations object and registered with the ACE_Reactor, and it then calls the appropriate op_handler. So, it's basically just another level of indirection in event dispatching. The coupling betweent the ultimate handler of the event and the ACE_Event_Handler class is relaxed a bit by have this intermediate <op_handler_> object of type <T> around. The client object can then dynamically change the bindings for the various handlers so that during the life of one of the operation objects, it can change how it wants events to be handled. It just instantiates a new instance of the template with different bindings and reregisters this new object with the ACE_Reactor.

Member Typedef Documentation

template<class T >

typedef int(T::* ACE_Event_Handler_T< T >::CL_HANDLER)(ACE_HANDLE, ACE_Reactor_Mask)

Handle close events.

template<class T >

typedef ACE_HANDLE(T::* ACE_Event_Handler_T< T >::GET_HANDLE)(void) const

template<class T >

typedef int(T::* ACE_Event_Handler_T< T >::IO_HANDLER)(ACE_HANDLE)

Handle I/O events.

template<class T >

typedef void(T::* ACE_Event_Handler_T< T >::SET_HANDLE)(ACE_HANDLE)

template<class T >

typedef int(T::* ACE_Event_Handler_T< T >::SIG_HANDLER)(int, siginfo_t *, ucontext_t *)

= Initialization and termination methods.

template<class T >

typedef int(T::* ACE_Event_Handler_T< T >::TO_HANDLER)(const ACE_Time_Value &, const void *)

Handle timeout events.

Constructor & Destructor Documentation

template<class T >

ACE_Event_Handler_T< T >::ACE_Event_Handler_T	(	T *	op_handler,
		int	delete_handler,
		GET_HANDLE	get_handle = `0`,
		IO_HANDLER	input = `0`,
		CL_HANDLER	close = `0`,
		SIG_HANDLER	sig = `0`,
		TO_HANDLER	timeout = `0`,
		IO_HANDLER	output = `0`,
		SET_HANDLE	set_handle = `0`,
		IO_HANDLER	except = `0`
	)

Initialize the op_handler.

template<class T >

ACE_Event_Handler_T< T >::~ACE_Event_Handler_T ( void )

Close down and delete the <op_handler>

Member Function Documentation

template<class T >

ACE_Event_Handler_T< T >::CL_HANDLER ACE_Event_Handler_T< T >::cl_handler ( void ) [inline]

template<class T >

void ACE_Event_Handler_T< T >::cl_handler ( CL_HANDLER )

template<class T >

void ACE_Event_Handler_T< T >::dump ( void ) const

Dump the state of an object.

template<class T >

ACE_Event_Handler_T< T >::IO_HANDLER ACE_Event_Handler_T< T >::except_handler ( void ) [inline]

template<class T >

void ACE_Event_Handler_T< T >::except_handler ( IO_HANDLER )

template<class T >

ACE_HANDLE ACE_Event_Handler_T< T >::get_handle ( void ) const [virtual]

Get the I/O handle.

Reimplemented from ACE_Event_Handler.

template<class T >

int ACE_Event_Handler_T< T >::handle_close	(	ACE_HANDLE	handle,
		ACE_Reactor_Mask	close_mask
	)		`[virtual]`

Called when a handle_*() method returns -1 or when the remove_handler() method is called on an ACE_Reactor. The close_mask indicates which event has triggered the handle_close() method callback on a particular handle.

Reimplemented from ACE_Event_Handler.

template<class T >

int ACE_Event_Handler_T< T >::handle_exception ( ACE_HANDLE fd = ACE_INVALID_HANDLE ) [virtual]

Called when an exceptional events occur (e.g., SIGURG).

Reimplemented from ACE_Event_Handler.

template<class T >

ACE_Event_Handler_T< T >::GET_HANDLE ACE_Event_Handler_T< T >::handle_get ( void ) [inline]

template<class T >

void ACE_Event_Handler_T< T >::handle_get ( GET_HANDLE )

template<class T >

int ACE_Event_Handler_T< T >::handle_input ( ACE_HANDLE fd = ACE_INVALID_HANDLE ) [virtual]

Called when input events occur (e.g., connection or data).

Reimplemented from ACE_Event_Handler.

template<class T >

int ACE_Event_Handler_T< T >::handle_output ( ACE_HANDLE fd = ACE_INVALID_HANDLE ) [virtual]

Called when output events are possible (e.g., when flow control abates or non-blocking connection completes).

Reimplemented from ACE_Event_Handler.

template<class T >

ACE_Event_Handler_T< T >::SET_HANDLE ACE_Event_Handler_T< T >::handle_set ( void ) [inline]

template<class T >

void ACE_Event_Handler_T< T >::handle_set ( SET_HANDLE )

template<class T >

int ACE_Event_Handler_T< T >::handle_signal	(	int	signum,
		siginfo_t *	= `0`,
		ucontext_t *	= `0`
	)		`[virtual]`

Called when object is signaled by OS (either via UNIX signals or when a Win32 object becomes signaled).

Reimplemented from ACE_Event_Handler.

template<class T >

int ACE_Event_Handler_T< T >::handle_timeout	(	const ACE_Time_Value &	current_time,
		const void *	act = `0`
	)		`[virtual]`

Called when timer expires. current_time represents the current time that the Event_Handler was selected for timeout dispatching and act is the asynchronous completion token that was passed in when <schedule_timer> was invoked.

Reimplemented from ACE_Event_Handler.

template<class T >

ACE_Event_Handler_T< T >::IO_HANDLER ACE_Event_Handler_T< T >::input_handler ( void ) [inline]