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/* -*- C++ -*- */
//=============================================================================
/**
* @file Event_Handler_T.h
*
* $Id$
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_EVENT_HANDLER_T_H
#define ACE_EVENT_HANDLER_T_H
#include /**/ "ace/pre.h"
#include "ace/Event_Handler.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#if defined (ACE_HAS_TEMPLATE_TYPEDEFS)
/**
* @class ACE_Event_Handler_T
*
* @brief 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 paramterize 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.
*/
template <class T>
class ACE_Event_Handler_T : public ACE_Event_Handler
{
public:
// = Typedefs to simplify pointer-to-member-function registration.
// Get/set the underlying handle.
typedef ACE_HANDLE (T::*GET_HANDLE) (void) const;
typedef void (T::*SET_HANDLE) (ACE_HANDLE);
/// Handle I/O events.
typedef int (T::*IO_HANDLER) (ACE_HANDLE);
/// Handle timeout events.
typedef int (T::*TO_HANDLER) (const ACE_Time_Value &, const void *);
/// Handle close events.
typedef int (T::*CL_HANDLER) (ACE_HANDLE, ACE_Reactor_Mask);
/// = Initialization and termination methods.
typedef int (T::*SIG_HANDLER) (int, siginfo_t*, ucontext_t*);
/// Initialize the op_handler.
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);
/// Close down and delete the <op_handler>
~ACE_Event_Handler_T (void);
// = Override all the ACE_Event_Handler methods.
// These methods all delegate down to the <T> operations handler.
virtual ACE_HANDLE get_handle (void) const;
virtual void set_handle (ACE_HANDLE);
virtual int handle_input (ACE_HANDLE fd = -1);
virtual int handle_output (ACE_HANDLE fd = -1);
virtual int handle_exception (ACE_HANDLE fd = -1);
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);
// = Get/set the operations handler.
T *op_handler (void);
void op_handler (T *);
// = Get/set the target pointer-to-method used for dispatching.
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);
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
protected:
/// Pointer to the object that handles all the delegated operations.
T *op_handler_;
// = Handle input, output, and exception events.
IO_HANDLER input_handler_;
IO_HANDLER output_handler_;
IO_HANDLER except_handler_;
/// Handle timeout events.
TO_HANDLER to_handler_;
/// Handle close events.
CL_HANDLER cl_handler_;
/// Handle signal events.
SIG_HANDLER sig_handler_;
/// Keeps track of whether we need to delete the handler in the
/// destructor.
int delete_handler_;
// = Get/set underlying handle.
SET_HANDLE set_handle_;
GET_HANDLE get_handle_;
};
#if defined (__ACE_INLINE__)
#include "ace/Event_Handler_T.inl"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Event_Handler_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Event_Handler_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_HAS_TEMPLATE_TYPEDEFS */
#include /**/ "ace/post.h"
#endif /* ACE_EVENT_HANDLER_H */
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