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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Event_Handler.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#ifndef ACE_EVENT_HANDLER_H
#define ACE_EVENT_HANDLER_H
#include "ace/ACE.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
// Forward declaration.
class ACE_Message_Block;
class ACE_Reactor;
class ACE_Thread_Manager;
typedef u_long ACE_Reactor_Mask;
class ACE_Export ACE_Event_Handler
{
// = TITLE
// Provides an abstract interface for handling various types of
// I/O, timer, and signal events.
//
// = DESCRIPTION
// Subclasses read/write input/output on an I/O descriptor,
// handle an exception raised on an I/O descriptor, handle a
// timer's expiration, or handle a signal.
public:
enum
{
LO_PRIORITY = 0,
HI_PRIORITY = 10,
NULL_MASK = 0,
#if defined (ACE_USE_POLL)
READ_MASK = POLLIN,
WRITE_MASK = POLLOUT,
EXCEPT_MASK = POLLPRI,
#else /* USE SELECT */
READ_MASK = (1 << 0),
WRITE_MASK = (1 << 1),
EXCEPT_MASK = (1 << 2),
#endif /* ACE_USE_POLL */
ACCEPT_MASK = (1 << 3),
CONNECT_MASK = (1 << 4),
TIMER_MASK = (1 << 5),
QOS_MASK = (1 << 6),
GROUP_QOS_MASK = (1 << 7),
ALL_EVENTS_MASK = READ_MASK |
WRITE_MASK |
EXCEPT_MASK |
ACCEPT_MASK |
CONNECT_MASK |
TIMER_MASK |
QOS_MASK |
GROUP_QOS_MASK,
RWE_MASK = READ_MASK |
WRITE_MASK |
EXCEPT_MASK,
DONT_CALL = (1 << 9)
};
virtual ~ACE_Event_Handler (void);
// Destructor is virtual to enable proper cleanup.
virtual ACE_HANDLE get_handle (void) const;
// Get the I/O handle.
virtual void set_handle (ACE_HANDLE);
// Set the I/O handle.
// = Get/set priority
// Priorities run from MIN_PRIORITY (which is the "lowest priority")
// to MAX_PRIORITY (which is the "highest priority").
virtual int priority (void) const;
// Get the priority of the Event_Handler.
virtual void priority (int priority);
// Set the priority of the Event_Handler.
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);
// Called when output events are possible (e.g., flow control
// abates).
virtual int handle_exception (ACE_HANDLE fd = ACE_INVALID_HANDLE);
// Called when execption events occur (e.g., SIGURG).
virtual int handle_timeout (const ACE_Time_Value &tv,
const void *arg = 0);
// Called when timer expires.
virtual int handle_close (ACE_HANDLE handle,
ACE_Reactor_Mask close_mask);
// Called when object is removed from the ACE_Reactor
virtual int handle_signal (int signum, siginfo_t * = 0, ucontext_t * = 0);
// Called when object is signaled by OS (either via UNIX signals or
// when a Win32 object becomes signaled).
virtual int handle_qos (ACE_HANDLE = ACE_INVALID_HANDLE);
virtual int handle_group_qos (ACE_HANDLE = ACE_INVALID_HANDLE);
// = Accessors to set/get the various event demultiplexors.
virtual void reactor (ACE_Reactor *reactor);
virtual ACE_Reactor *reactor (void) const;
#if !defined (ACE_HAS_WINCE)
static void *read_adapter (void *event_handler);
// Used to read from non-socket ACE_HANDLEs in our own thread to
// work around Win32 limitations that don't allow us to select() on
// non-sockets (such as ACE_STDIN). This is commonly used in
// situations where the Reactor is used to demultiplex read events
// on ACE_STDIN on UNIX. Note that <event_handler> must be a
// subclass of <ACE_Event_Handler>. If the <get_handle> method of
// this event handler returns <ACE_INVALID_HANDLE> we default to
// reading from ACE_STDIN.
static int register_stdin_handler (ACE_Event_Handler *eh,
ACE_Reactor *reactor,
ACE_Thread_Manager *thr_mgr,
int flags = THR_DETACHED);
// Abstracts away from the differences between Win32 and ACE with
// respect to reading from ACE_STDIN (which is non-select()'able on
// Win32.
static int remove_stdin_handler (ACE_Reactor *reactor,
ACE_Thread_Manager *thr_mgr);
// Performs the inverse of the <register_stdin_handler> method.
#endif /* ACE_HAS_WINCE */
protected:
ACE_Event_Handler (void);
// Force ACE_Event_Handler to be an abstract base class.
int priority_;
// Priority of this Event_Handler.
// = Pointers to the various event demultiplexors.
ACE_Reactor *reactor_;
};
class ACE_Export ACE_Notification_Buffer
{
// = TITLE
// Simple wrapper for passing <ACE_Event_Handler *>s and
// <ACE_Reactor_Mask>s between threads.
public:
ACE_Notification_Buffer (void);
ACE_Notification_Buffer (ACE_Event_Handler *eh,
ACE_Reactor_Mask mask);
~ACE_Notification_Buffer (void);
// Default dtor.
ACE_Event_Handler *eh_;
// Pointer to the Event_Handler that will be dispatched
// by the main event loop.
ACE_Reactor_Mask mask_;
// Mask that indicates which method to call.
};
#if defined (__ACE_INLINE__)
#include "ace/Event_Handler.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_EVENT_HANDLER_H */
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