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ACE_Event_Handler Class Reference

Provides an abstract interface for handling various types of I/O, timer, and signal events. More...

#include <Event_Handler.h>

Inheritance diagram for ACE_Event_Handler:

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Collaboration diagram for ACE_Event_Handler:

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List of all members.

Public Types

typedef long Reference_Count
 Reference count type.

enum  {
  LO_PRIORITY = 0, HI_PRIORITY = 10, NULL_MASK = 0, READ_MASK = (1 << 0),
  WRITE_MASK = (1 << 1), EXCEPT_MASK = (1 << 2), ACCEPT_MASK = (1 << 3), CONNECT_MASK = (1 << 4),
  TIMER_MASK = (1 << 5), QOS_MASK = (1 << 6), GROUP_QOS_MASK = (1 << 7), SIGNAL_MASK = (1 << 8),
  ALL_EVENTS_MASK, RWE_MASK, DONT_CALL = (1 << 9)
}
enum  { ACE_EVENT_HANDLER_NOT_RESUMED = -1, ACE_REACTOR_RESUMES_HANDLER = 0, ACE_APPLICATION_RESUMES_HANDLER }

Public Methods

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.

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)
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 &current_time, const void *act=0)
virtual int handle_exit (ACE_Process *)
 Called when a process exits.

virtual int handle_close (ACE_HANDLE handle, ACE_Reactor_Mask close_mask)
virtual int handle_signal (int signum, siginfo_t *=0, ucontext_t *=0)
virtual int resume_handler (void)
virtual int handle_qos (ACE_HANDLE=ACE_INVALID_HANDLE)
virtual int handle_group_qos (ACE_HANDLE=ACE_INVALID_HANDLE)
virtual void reactor (ACE_Reactor *reactor)
 Set the event demultiplexors.

virtual ACE_Reactor * reactor (void) const
 Get the event demultiplexors.

virtual ACE_Reactor_Timer_Interface * reactor_timer_interface (void) const
 Get only the reactor's timer related interface.

virtual Reference_Count add_reference (void)
 Increment reference count on the handler.

virtual Reference_Count remove_reference (void)
 Decrement reference count on the handler.

Reference_Counting_Policy & reference_counting_policy (void)
 Current Reference_Counting_Policy.


Static Public Methods

ACE_THR_FUNC_RETURN read_adapter (void *event_handler)
int register_stdin_handler (ACE_Event_Handler *eh, ACE_Reactor *reactor, ACE_Thread_Manager *thr_mgr, int flags=THR_DETACHED)
int remove_stdin_handler (ACE_Reactor *reactor, ACE_Thread_Manager *thr_mgr)
 Performs the inverse of the <register_stdin_handler> method.


Protected Types

typedef ACE_Atomic_Op< ACE_SYNCH_MUTEX,
Reference_Count > 		Atomic_Reference_Count
 Typedef for implementation of reference counting.


Protected Methods

 ACE_Event_Handler (ACE_Reactor *=0, int priority=ACE_Event_Handler::LO_PRIORITY)
 Force ACE_Event_Handler to be an abstract base class.


Protected Attributes

Atomic_Reference_Count reference_count_
 Reference count.


Private Attributes

int priority_
 Priority of this Event_Handler.

ACE_Reactor * reactor_
 Pointer to the various event demultiplexors.

Reference_Counting_Policy reference_counting_policy_
 Reference counting requirements.

Detailed Description

Provides an abstract interface for handling various types of I/O, timer, and signal events.

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.

Member Typedef Documentation

typedef ACE_Atomic_Op<ACE_SYNCH_MUTEX, Reference_Count> ACE_Event_Handler::Atomic_Reference_Count [protected]
 

Typedef for implementation of reference counting.

typedef long ACE_Event_Handler::Reference_Count
 

Reference count type.

Member Enumeration Documentation

anonymous enum
 

Enumeration values:
LO_PRIORITY 
HI_PRIORITY 
NULL_MASK 
READ_MASK 
WRITE_MASK 
EXCEPT_MASK 
ACCEPT_MASK 
CONNECT_MASK 
TIMER_MASK 
QOS_MASK 
GROUP_QOS_MASK 
SIGNAL_MASK 
ALL_EVENTS_MASK 
RWE_MASK 
DONT_CALL 

anonymous enum
 

Enumeration values:
ACE_EVENT_HANDLER_NOT_RESUMED  The handler is not resumed at all. Could lead to deadlock..
ACE_REACTOR_RESUMES_HANDLER  The reactor takes responsibility of resuming the handler and is the default
ACE_APPLICATION_RESUMES_HANDLER  The application takes responsibility of resuming the handler.

Constructor & Destructor Documentation

ACE_Event_Handler::~ACE_Event_Handler (  void    )  [virtual]
 

Destructor is virtual to enable proper cleanup.

ACE_Event_Handler::ACE_Event_Handler (  ACE_Reactor *    = 0,
int    priority = ACE_Event_Handler::LO_PRIORITY
)  [protected]
 

Force ACE_Event_Handler to be an abstract base class.

Member Function Documentation

ACE_Event_Handler::Reference_Count ACE_Event_Handler::add_reference (  void    )  [virtual]
 

Increment reference count on the handler.

This method is called when the handler is registered with the Reactor and when the Reactor makes an upcall on the handler. Reference count is 1 when the handler is created.

Returns:
Current reference count.

ACE_HANDLE ACE_Event_Handler::get_handle (  void    )  const [virtual]
 

Get the I/O handle.

Reimplemented in ACE_Acceptor< SVC_HANDLER, >, ACE_Strategy_Acceptor< SVC_HANDLER, >, ACE_Oneshot_Acceptor< SVC_HANDLER, >, ACE_Event_Handler_T< T >, ACE_Name_Proxy, ACE_POSIX_Asynch_Accept, ACE_POSIX_Asynch_Connect, ACE_POSIX_Proactor, ACE_Proactor_Impl, ACE_Service_Manager, ACE_Svc_Handler<, >, ACE_WFMO_Reactor_Notify, ACE_WIN32_Asynch_Connect, ACE_WIN32_Proactor, ACE_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_2 >, and ACE_Svc_Handler< ACE_PEER_STREAM_2, ACE_SYNCH_USE >.

int ACE_Event_Handler::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 in ACE_Acceptor< SVC_HANDLER, >, ACE_Strategy_Acceptor< SVC_HANDLER, >, ACE_Oneshot_Acceptor< SVC_HANDLER, >, ACE_Event_Handler_T< T >, ACE_POSIX_Asynch_Accept, ACE_POSIX_Asynch_Connect, ACE_Service_Manager, ACE_Svc_Handler<, >, ACE_WIN32_Asynch_Connect, ACE_WIN32_Proactor, ACE_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_2 >, and ACE_Svc_Handler< ACE_PEER_STREAM_2, ACE_SYNCH_USE >.

int ACE_Event_Handler::handle_exception (  ACE_HANDLE    fd = ACE_INVALID_HANDLE )  [virtual]
 

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

Reimplemented in ACE_NonBlocking_Connect_Handler< SVC_HANDLER >, ACE_Event_Handler_T< T >, ACE_POSIX_Asynch_Connect, and ACE_WIN32_Asynch_Connect.

int ACE_Event_Handler::handle_exit (  ACE_Process *    )  [virtual]
 

Called when a process exits.

int ACE_Event_Handler::handle_group_qos (  ACE_HANDLE    = ACE_INVALID_HANDLE )  [virtual]
 

int ACE_Event_Handler::handle_input (  ACE_HANDLE    fd = ACE_INVALID_HANDLE )  [virtual]
 

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

Reimplemented in ACE_Acceptor< SVC_HANDLER, >, ACE_Oneshot_Acceptor< SVC_HANDLER, >, ACE_NonBlocking_Connect_Handler< SVC_HANDLER >, ACE_Dev_Poll_Reactor_Notify, ACE_Event_Handler_T< T >, ACE_POSIX_Asynch_Accept, ACE_POSIX_Asynch_Connect, ACE_Select_Reactor_Notify, ACE_Service_Manager, ACE_WIN32_Asynch_Connect, and ACE_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_2 >.

int ACE_Event_Handler::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 in ACE_NonBlocking_Connect_Handler< SVC_HANDLER >, ACE_Event_Handler_T< T >, ACE_POSIX_Asynch_Connect, and ACE_WIN32_Asynch_Connect.

int ACE_Event_Handler::handle_qos (  ACE_HANDLE    = ACE_INVALID_HANDLE )  [virtual]
 

int ACE_Event_Handler::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 in ACE_Strategy_Acceptor< SVC_HANDLER, >, ACE_Event_Handler_T< T >, ACE_Shared_Memory_Pool, ACE_MMAP_Memory_Pool, ACE_Process_Manager, ACE_Service_Manager, ACE_Sig_Adapter, ACE_Test_and_Set< ACE_LOCK, TYPE >, ACE_Async_Timer_Queue_Adapter< TQ >, ACE_Wakeup_All_Threads_Handler, ACE_WFMO_Reactor_Notify, and ACE_WIN32_Proactor.

int ACE_Event_Handler::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 in ACE_Oneshot_Acceptor< SVC_HANDLER, >, ACE_NonBlocking_Connect_Handler< SVC_HANDLER >, ACE_Event_Handler_T< T >, ACE_Logging_Strategy, ACE_Svc_Handler<, >, ACE_Buffered_Svc_Handler<, >, and ACE_Svc_Handler< ACE_PEER_STREAM_2, ACE_SYNCH_USE >.

void ACE_Event_Handler::priority (  int    priority )  [virtual]
 

Set the priority of the Event_Handler.

int ACE_Event_Handler::priority (  void    )  const [virtual]
 

Get the priority of the Event_Handler.

ACE_Reactor * ACE_Event_Handler::reactor (  void    )  const [virtual]
 

Get the event demultiplexors.

Reimplemented in ACE_Connector< SVC_HANDLER, >, and ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_2 >.

void ACE_Event_Handler::reactor (  ACE_Reactor *    reactor )  [virtual]
 

Set the event demultiplexors.

Reimplemented in ACE_Connector< SVC_HANDLER, >, and ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_2 >.

ACE_Reactor_Timer_Interface * ACE_Event_Handler::reactor_timer_interface (  void    )  const [virtual]
 

Get only the reactor's timer related interface.

ACE_THR_FUNC_RETURN ACE_Event_Handler::read_adapter (  void *    event_handler )  [static]
 

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.

ACE_Event_Handler::Reference_Counting_Policy & ACE_Event_Handler::reference_counting_policy (  void    ) 
 

Current Reference_Counting_Policy.

int ACE_Event_Handler::register_stdin_handler (  ACE_Event_Handler *    eh,
ACE_Reactor *    reactor,
ACE_Thread_Manager *    thr_mgr,
int    flags = THR_DETACHED
)  [static]
 

Abstracts away from the differences between Win32 and ACE with respect to reading from ACE_STDIN, which is non-<select>'able on Win32.

ACE_Event_Handler::Reference_Count ACE_Event_Handler::remove_reference (  void    )  [virtual]
 

Decrement reference count on the handler.

This method is called when the handler is removed from the Reactor and when an upcall made on the handler by the Reactor completes. Handler is deleted when the reference count reaches 0.

Returns:
Current reference count.

int ACE_Event_Handler::remove_stdin_handler (  ACE_Reactor *    reactor,
ACE_Thread_Manager *    thr_mgr
)  [static]
 

Performs the inverse of the <register_stdin_handler> method.

int ACE_Event_Handler::resume_handler (  void    )  [virtual]
 

Reimplemented in ACE_NonBlocking_Connect_Handler< SVC_HANDLER >.

void ACE_Event_Handler::set_handle (  ACE_HANDLE    )  [virtual]
 

Set the I/O handle.

Reimplemented in ACE_Event_Handler_T< T >, ACE_POSIX_Asynch_Accept, ACE_POSIX_Asynch_Connect, ACE_Svc_Handler<, >, ACE_WIN32_Asynch_Connect, and ACE_Svc_Handler< ACE_PEER_STREAM_2, ACE_SYNCH_USE >.

Member Data Documentation

int ACE_Event_Handler::priority_ [private]
 

Priority of this Event_Handler.

ACE_Reactor* ACE_Event_Handler::reactor_ [private]
 

Pointer to the various event demultiplexors.

Reimplemented in ACE_Asynch_Pseudo_Task, ACE_Connector< SVC_HANDLER, >, ACE_Name_Proxy, and ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_2 >.

Atomic_Reference_Count ACE_Event_Handler::reference_count_ [protected]
 

Reference count.

Reference_Counting_Policy ACE_Event_Handler::reference_counting_policy_ [private]
 

Reference counting requirements.

The documentation for this class was generated from the following files:
Generated on Fri Apr 2 16:48:27 2004 for ACE by doxygen1.2.18