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.

Classes

class  Policy
 Base class for all handler policies. More...
class  Reference_Counting_Policy
 This policy dictates the reference counting requirements for the handler. More...

Public Types

enum  {
  LO_PRIORITY = 0, HI_PRIORITY = 10, NULL_MASK = 0, READ_MASK = POLLIN,
  WRITE_MASK = POLLOUT, EXCEPT_MASK = POLLPRI, READ_MASK = POLLIN, WRITE_MASK = POLLOUT,
  EXCEPT_MASK = POLLPRI, 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 }
typedef long Reference_Count
 Reference count type.

Public Member Functions

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 Member Functions

static ACE_THR_FUNC_RETURN read_adapter (void *event_handler)
static int register_stdin_handler (ACE_Event_Handler *eh, ACE_Reactor *reactor, ACE_Thread_Manager *thr_mgr, int flags=THR_DETACHED)
static 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 Member Functions

 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.

Definition at line 48 of file Event_Handler.h.

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.

Definition at line 289 of file Event_Handler.h.

typedef long ACE_Event_Handler::Reference_Count

Reference count type.

Definition at line 201 of file Event_Handler.h.

Member Enumeration Documentation

anonymous enum
Enumerator:
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.

Definition at line 138 of file Event_Handler.h.

00139     {
00140       /// The handler is not resumed at all. Could lead to deadlock..
00141       ACE_EVENT_HANDLER_NOT_RESUMED = -1,
00142       /// The reactor takes responsibility of resuming the handler and
00143       /// is the default
00144       ACE_REACTOR_RESUMES_HANDLER = 0,
00145       /// The application takes responsibility of resuming the handler
00146       ACE_APPLICATION_RESUMES_HANDLER
00147     };

anonymous enum
Enumerator:
LO_PRIORITY 
HI_PRIORITY 
NULL_MASK 
READ_MASK 
WRITE_MASK 
EXCEPT_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 

Definition at line 51 of file Event_Handler.h.

00052   {
00053     LO_PRIORITY = 0,
00054     HI_PRIORITY = 10,
00055     NULL_MASK = 0,
00056 #if defined (ACE_USE_POLL)
00057     READ_MASK = POLLIN,
00058     WRITE_MASK = POLLOUT,
00059     EXCEPT_MASK = POLLPRI,
00060 #else /* USE SELECT */
00061     READ_MASK = (1 << 0),
00062     WRITE_MASK = (1 << 1),
00063     EXCEPT_MASK = (1 << 2),
00064 #endif /* ACE_USE_POLL */
00065     ACCEPT_MASK = (1 << 3),
00066     CONNECT_MASK = (1 << 4),
00067     TIMER_MASK = (1 << 5),
00068     QOS_MASK = (1 << 6),
00069     GROUP_QOS_MASK = (1 << 7),
00070     SIGNAL_MASK = (1 << 8),
00071     ALL_EVENTS_MASK = READ_MASK |
00072                       WRITE_MASK |
00073                       EXCEPT_MASK |
00074                       ACCEPT_MASK |
00075                       CONNECT_MASK |
00076                       TIMER_MASK |
00077                       QOS_MASK |
00078                       GROUP_QOS_MASK |
00079                       SIGNAL_MASK,
00080     RWE_MASK = READ_MASK |
00081                WRITE_MASK |
00082                EXCEPT_MASK,
00083     DONT_CALL = (1 << 9)
00084   };

Constructor & Destructor Documentation

ACE_Event_Handler::~ACE_Event_Handler ( void   )  [virtual]

Destructor is virtual to enable proper cleanup.

Definition at line 34 of file Event_Handler.cpp.

00035 {
00036   // ACE_TRACE ("ACE_Event_Handler::~ACE_Event_Handler");
00037 }

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

Force ACE_Event_Handler to be an abstract base class.

Definition at line 24 of file Event_Handler.cpp.

00026   : reference_count_ (1),
00027     priority_ (p),
00028     reactor_ (r),
00029     reference_counting_policy_ (Reference_Counting_Policy::DISABLED)
00030 {
00031   // ACE_TRACE ("ACE_Event_Handler::ACE_Event_Handler");
00032 }

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.

Definition at line 185 of file Event_Handler.cpp.

00186 {
00187   bool const reference_counting_required =
00188     this->reference_counting_policy ().value () ==
00189     ACE_Event_Handler::Reference_Counting_Policy::ENABLED;
00190 
00191   if (reference_counting_required)
00192     return ++this->reference_count_;
00193   else
00194     return 1;
00195 }

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

Get the I/O handle.

Reimplemented in ACE_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_1 >, ACE_Strategy_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_1 >, ACE_Oneshot_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_1 >, ACE_Name_Proxy, ACE_Proactor_Impl, ACE_Service_Manager, ACE_Svc_Handler< ACE_PEER_STREAM_1, ACE_SYNCH_DECL >, 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 >.

Definition at line 42 of file Event_Handler.cpp.

00043 {
00044   ACE_TRACE ("ACE_Event_Handler::get_handle");
00045   return ACE_INVALID_HANDLE;
00046 }

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_PEER_ACCEPTOR_1 >, ACE_Strategy_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_1 >, ACE_Oneshot_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_1 >, ACE_Service_Manager, ACE_Svc_Handler< ACE_PEER_STREAM_1, ACE_SYNCH_DECL >, 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 >.

Definition at line 78 of file Event_Handler.cpp.

00079 {
00080   ACE_TRACE ("ACE_Event_Handler::handle_close");
00081   return -1;
00082 }

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 >, and ACE_WIN32_Asynch_Connect.

Definition at line 105 of file Event_Handler.cpp.

00106 {
00107   ACE_TRACE ("ACE_Event_Handler::handle_exception");
00108   return -1;
00109 }

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

Called when a process exits.

Definition at line 123 of file Event_Handler.cpp.

00124 {
00125   ACE_TRACE ("ACE_Event_Handler::handle_exit");
00126   return -1;
00127 }

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

Definition at line 157 of file Event_Handler.cpp.

00158 {
00159   ACE_TRACE ("ACE_Event_Handler::handle_group_qos");
00160   return -1;
00161 }

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_PEER_ACCEPTOR_1 >, ACE_Oneshot_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_1 >, ACE_NonBlocking_Connect_Handler< SVC_HANDLER >, ACE_Dev_Poll_Reactor_Notify, ACE_Process_Manager, ACE_Select_Reactor_Notify, ACE_Service_Manager, ACE_WIN32_Asynch_Connect, and ACE_Acceptor< SVC_HANDLER, ACE_PEER_ACCEPTOR_2 >.

Definition at line 87 of file Event_Handler.cpp.

00088 {
00089   ACE_TRACE ("ACE_Event_Handler::handle_input");
00090   return -1;
00091 }

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 >, and ACE_WIN32_Asynch_Connect.

Definition at line 96 of file Event_Handler.cpp.

00097 {
00098   ACE_TRACE ("ACE_Event_Handler::handle_output");
00099   return -1;
00100 }

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

Definition at line 150 of file Event_Handler.cpp.

00151 {
00152   ACE_TRACE ("ACE_Event_Handler::handle_qos");
00153   return -1;
00154 }

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_PEER_ACCEPTOR_1 >, ACE_MMAP_Memory_Pool, ACE_Process_Manager, ACE_Service_Manager, ACE_Shared_Memory_Pool, 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.

Definition at line 132 of file Event_Handler.cpp.

00133 {
00134   ACE_TRACE ("ACE_Event_Handler::handle_signal");
00135   return -1;
00136 }

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_PEER_ACCEPTOR_1 >, ACE_NonBlocking_Connect_Handler< SVC_HANDLER >, ACE_Logging_Strategy, ACE_Svc_Handler< ACE_PEER_STREAM_1, ACE_SYNCH_DECL >, ACE_Buffered_Svc_Handler< ACE_PEER_STREAM_1, ACE_SYNCH_DECL >, and ACE_Svc_Handler< ACE_PEER_STREAM_2, ACE_SYNCH_USE >.

Definition at line 114 of file Event_Handler.cpp.

00115 {
00116   ACE_TRACE ("ACE_Event_Handler::handle_timeout");
00117   return -1;
00118 }

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

Set the priority of the Event_Handler.

Definition at line 68 of file Event_Handler.cpp.

00069 {
00070   ACE_TRACE ("ACE_Event_Handler::priority");
00071   this->priority_ = priority;
00072 }

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

Get the priority of the Event_Handler.

Definition at line 59 of file Event_Handler.cpp.

00060 {
00061   ACE_TRACE ("ACE_Event_Handler::priority");
00062   return this->priority_;
00063 }

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

Get the event demultiplexors.

Reimplemented in ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_1 >, and ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_2 >.

Definition at line 171 of file Event_Handler.cpp.

00172 {
00173   ACE_TRACE ("ACE_Event_Handler::reactor");
00174   return this->reactor_;
00175 }

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

Set the event demultiplexors.

Reimplemented in ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_1 >, and ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_2 >.

Definition at line 164 of file Event_Handler.cpp.

00165 {
00166   ACE_TRACE ("ACE_Event_Handler::reactor");
00167   this->reactor_ = reactor;
00168 }

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

Get only the reactor's timer related interface.

Definition at line 178 of file Event_Handler.cpp.

00179 {
00180   ACE_TRACE ("ACE_Event_Handler::reactor_timer_interface");
00181   return this->reactor_;
00182 }

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.

Definition at line 248 of file Event_Handler.cpp.

00249 {
00250   ACE_Event_Handler *this_ptr = static_cast<ACE_Event_Handler *> (args);
00251   ACE_Reactor *r = this_ptr->reactor ();
00252 
00253   while (this_ptr->handle_input (ACE_STDIN) != -1)
00254     continue;
00255 
00256   this_ptr->handle_close (ACE_STDIN, ACE_Event_Handler::READ_MASK);
00257   // It's possible for handle_close() to "delete this" so we need to
00258   // cache the reactor pointer and use it here.
00259   r->notify ();
00260 
00261   return 0;
00262 }

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

Current Reference_Counting_Policy.

Definition at line 242 of file Event_Handler.cpp.

00243 {
00244   return this->reference_counting_policy_;
00245 }

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.

Definition at line 265 of file Event_Handler.cpp.

00269 {
00270 #if defined (ACE_WIN32)
00271   ACE_UNUSED_ARG (reactor);
00272 
00273   eh->reactor (reactor);
00274   return thr_mgr->spawn (&read_adapter, static_cast<void *> (eh), flags);
00275 #else
00276   // Keep compilers happy.
00277   ACE_UNUSED_ARG (flags);
00278   ACE_UNUSED_ARG (thr_mgr);
00279   return reactor->register_handler (ACE_STDIN,
00280                                     eh,
00281                                     ACE_Event_Handler::READ_MASK);
00282 #endif /* ACE_WIN32 */
00283 }

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.

Definition at line 198 of file Event_Handler.cpp.

00199 {
00200   bool const reference_counting_required =
00201     this->reference_counting_policy ().value () ==
00202     ACE_Event_Handler::Reference_Counting_Policy::ENABLED;
00203 
00204   if (reference_counting_required)
00205     {
00206       Reference_Count result =
00207         --this->reference_count_;
00208 
00209       if (result == 0)
00210         delete this;
00211 
00212       return result;
00213     }
00214   else
00215     {
00216       return 1;
00217     }
00218 }

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.

Definition at line 286 of file Event_Handler.cpp.

00288 {
00289 #if defined (ACE_WIN32)
00290   ACE_UNUSED_ARG (reactor);
00291 
00292   // What should we do here?
00293   ACE_NOTSUP_RETURN (-1);
00294 #else
00295   return reactor->remove_handler (ACE_STDIN,
00296                                   ACE_Event_Handler::READ_MASK);
00297 #endif /* ACE_WIN32 */
00298 }

int ACE_Event_Handler::resume_handler ( void   )  [virtual]

Called to figure out whether the handler needs to resumed by the reactor or the application can take care of it. The default value of 0 would be returned which would allow the reactor to take care of resumption of the handler. The application can return a value more than zero and decide to resume the handler themseleves.

Note:
This method has an affect only when used with the ACE_Dev_Poll_Reactor (and then, only on Linux) or the ACE_TP_Reactor.

Reimplemented in ACE_NonBlocking_Connect_Handler< SVC_HANDLER >.

Definition at line 139 of file Event_Handler.cpp.

00140 {
00141   ACE_TRACE ("ACE_Event_Handler::resume_handler");
00142 
00143   // Return a default value and allow the reactor to take care of
00144   // resuming the handler
00145   return ACE_Event_Handler::ACE_REACTOR_RESUMES_HANDLER;
00146 }

void ACE_Event_Handler::set_handle ( ACE_HANDLE   )  [virtual]

Set the I/O handle.

Reimplemented in ACE_Svc_Handler< ACE_PEER_STREAM_1, ACE_SYNCH_DECL >, ACE_WIN32_Asynch_Connect, and ACE_Svc_Handler< ACE_PEER_STREAM_2, ACE_SYNCH_USE >.

Definition at line 51 of file Event_Handler.cpp.

00052 {
00053   ACE_TRACE ("ACE_Event_Handler::set_handle");
00054 }

Member Data Documentation

int ACE_Event_Handler::priority_ [private]

Priority of this Event_Handler.

Definition at line 297 of file Event_Handler.h.

ACE_Reactor* ACE_Event_Handler::reactor_ [private]

Pointer to the various event demultiplexors.

Reimplemented in ACE_Asynch_Pseudo_Task, ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_1 >, ACE_Name_Proxy, and ACE_Connector< SVC_HANDLER, ACE_PEER_CONNECTOR_2 >.

Definition at line 300 of file Event_Handler.h.

Atomic_Reference_Count ACE_Event_Handler::reference_count_ [protected]

Reference count.

Definition at line 292 of file Event_Handler.h.

Reference_Counting_Policy ACE_Event_Handler::reference_counting_policy_ [private]

Reference counting requirements.

Definition at line 303 of file Event_Handler.h.

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