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Diffstat (limited to 'ACE/ace/Timer_Hash_T.h')
-rw-r--r-- | ACE/ace/Timer_Hash_T.h | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/ACE/ace/Timer_Hash_T.h b/ACE/ace/Timer_Hash_T.h new file mode 100644 index 00000000000..c7eee094c63 --- /dev/null +++ b/ACE/ace/Timer_Hash_T.h @@ -0,0 +1,328 @@ +/* -*- C++ -*- */ + +//============================================================================= +/** + * @file Timer_Hash_T.h + * + * $Id$ + * + * @author Darrell Brunsch <brunsch@cs.wustl.edu> + */ +//============================================================================= + +#ifndef ACE_TIMER_HASH_T_H +#define ACE_TIMER_HASH_T_H +#include /**/ "ace/pre.h" + +#include "ace/Timer_Queue_T.h" + +#if !defined (ACE_LACKS_PRAGMA_ONCE) +# pragma once +#endif /* ACE_LACKS_PRAGMA_ONCE */ + +#include "ace/Free_List.h" + +ACE_BEGIN_VERSIONED_NAMESPACE_DECL + +// Forward declaration. +template <class TYPE, class FUNCTOR, class ACE_LOCK, class BUCKET> +class ACE_Timer_Hash_T; + +/** + * @class ACE_Timer_Hash_Upcall + * + * @brief Functor for Timer_Hash + * + * This class calls up to the Timer Hash's functor from the + * timer queues in the hash table + */ +template <class TYPE, class FUNCTOR, class ACE_LOCK> +class ACE_Timer_Hash_Upcall +{ +public: + typedef ACE_Timer_Queue_T<ACE_Event_Handler *, + ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, ACE_LOCK>, + ACE_Null_Mutex> + TIMER_QUEUE; + + /// Default constructor (creates an invalid object, but needs to be here + /// so timer queues using this functor can be constructed) + ACE_Timer_Hash_Upcall (void); + + /// Constructor that specifies a Timer_Hash to call up to + ACE_Timer_Hash_Upcall (ACE_Timer_Queue_T<TYPE, FUNCTOR, ACE_LOCK> *timer_hash); + + /// This method is called when a timer is registered. + int registration (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + const void *arg); + + /// This method is called before the timer expires. + int preinvoke (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + const void *arg, + int recurring_timer, + const ACE_Time_Value &cur_time, + const void *&upcall_act); + + /// This method is called when the timer expires. + int timeout (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + const void *arg, + int recurring_timer, + const ACE_Time_Value &cur_time); + + /// This method is called after the timer expires. + int postinvoke (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + const void *arg, + int recurring_timer, + const ACE_Time_Value &cur_time, + const void *upcall_act); + + /// This method is called when a handler is cancelled + int cancel_type (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + int dont_call, + int &requires_reference_counting); + + /// This method is called when a timer is cancelled + int cancel_timer (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + int dont_call, + int requires_reference_counting); + + /// This method is called when the timer queue is destroyed and + /// the timer is still contained in it + int deletion (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + const void *arg); + +private: + /// Timer Queue to do the calling up to + ACE_Timer_Queue_T<TYPE, FUNCTOR, ACE_LOCK> *timer_hash_; + + // = Don't allow these operations for now. + ACE_UNIMPLEMENTED_FUNC (ACE_Timer_Hash_Upcall (const ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, ACE_LOCK> &)) + ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, ACE_LOCK> &)) +}; + +/** + * @class ACE_Timer_Hash_Iterator_T + * + * @brief Iterates over an <ACE_Timer_Hash_T>. + * + * This is a generic iterator that can be used to visit every + * node of a timer queue. Be aware that it doesn't transverse + * in the order of timeout values. + */ +template <class TYPE, class FUNCTOR, class ACE_LOCK, class BUCKET> +class ACE_Timer_Hash_Iterator_T : public ACE_Timer_Queue_Iterator_T <TYPE, FUNCTOR, ACE_LOCK> +{ +public: + /// Constructor. + ACE_Timer_Hash_Iterator_T (ACE_Timer_Hash_T<TYPE, FUNCTOR, ACE_LOCK, BUCKET> &); + + /// Positions the iterator at the earliest node in the Timer Queue + virtual void first (void); + + /// Positions the iterator at the next node in the Timer Queue + virtual void next (void); + + /// Returns true when there are no more nodes in the sequence + virtual int isdone (void) const; + + /// Returns the node at the current position in the sequence + virtual ACE_Timer_Node_T<TYPE> *item (void); + +protected: + /// Pointer to the ACE_Timer_Hash that we are iterating over. + ACE_Timer_Hash_T<TYPE, FUNCTOR, ACE_LOCK, BUCKET> &timer_hash_; + + /// Current position in <timer_hash_>'s table + size_t position_; + + /// Current iterator used on <position>'s bucket + ACE_Timer_Queue_Iterator_T<TYPE, ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, ACE_LOCK>, ACE_Null_Mutex> *iter_; +}; + +/** + * @class ACE_Timer_Hash_T + * + * @brief Provides a hash table of <BUCKET>s as an implementation for + * a timer queue. + * + * This implementation uses a hash table of BUCKETs. The hash + * is based on the time_value of the event. Unlike other Timer + * Queues, ACE_Timer_Hash does not expire events in order. + */ +template <class TYPE, class FUNCTOR, class ACE_LOCK, class BUCKET> +class ACE_Timer_Hash_T : public ACE_Timer_Queue_T<TYPE, FUNCTOR, ACE_LOCK> +{ +public: + /// Type of iterator + typedef ACE_Timer_Hash_Iterator_T<TYPE, FUNCTOR, ACE_LOCK, BUCKET> + HASH_ITERATOR; + + /// Iterator is a friend + friend class ACE_Timer_Hash_Iterator_T<TYPE, FUNCTOR, ACE_LOCK, BUCKET>; + + /// Type inherited from + typedef ACE_Timer_Queue_T<TYPE, FUNCTOR, ACE_LOCK> INHERITED; + + // = Initialization and termination methods. + /** + * Default constructor. <table_size> determines the size of the + * hash table. <upcall_functor> is the instance of the FUNCTOR + * to be used by the buckets. If <upcall_functor> is 0, a default + * FUNCTOR will be created. + */ + ACE_Timer_Hash_T (size_t table_size, + FUNCTOR *upcall_functor = 0, + ACE_Free_List<ACE_Timer_Node_T <TYPE> > *freelist = 0); + + /** + * Default constructor. <upcall_functor> is the instance of the + * FUNCTOR to be used by the queue. If <upcall_functor> is 0, Timer + * Hash will create a default FUNCTOR. <freelist> the freelist of + * timer nodes. If 0, then a default freelist will be created. The default + * size will be ACE_DEFAULT_TIMERS and there will be no preallocation. + */ + ACE_Timer_Hash_T (FUNCTOR *upcall_functor = 0, ACE_Free_List<ACE_Timer_Node_T <TYPE> > *freelist = 0); + + /// Destructor + virtual ~ACE_Timer_Hash_T (void); + + /// True if queue is empty, else false. + virtual int is_empty (void) const; + + /// Returns the time of the earlier node in the <ACE_Timer_Hash>. + /// Must be called on a non-empty queue. + virtual const ACE_Time_Value &earliest_time (void) const; + + /** + * Resets the interval of the timer represented by <timer_id> to + * <interval>, which is specified in relative time to the current + * <gettimeofday>. If <interval> is equal to + * <ACE_Time_Value::zero>, the timer will become a non-rescheduling + * timer. Returns 0 if successful, -1 if not. + */ + virtual int reset_interval (long timer_id, + const ACE_Time_Value &interval); + + /** + * Cancel all timer associated with <type>. If <dont_call> is 0 + * then the <functor> will be invoked. Returns number of timers + * cancelled. + */ + virtual int cancel (const TYPE &type, + int dont_call_handle_close = 1); + + /** + * Cancel the single timer that matches the <timer_id> value (which + * was returned from the <schedule> method). If act is non-NULL + * then it will be set to point to the ``magic cookie'' argument + * passed in when the timer was registered. This makes it possible + * to free up the memory and avoid memory leaks. If <dont_call> is + * 0 then the <functor> will be invoked. Returns 1 if cancellation + * succeeded and 0 if the <timer_id> wasn't found. + */ + virtual int cancel (long timer_id, + const void **act = 0, + int dont_call_handle_close = 1); + + /** + * Run the <functor> for all timers whose values are <= + * <ACE_OS::gettimeofday>. Also accounts for <timer_skew>. Returns + * the number of timers canceled. + */ + virtual int expire (void); + + /** + * Run the <functor> for all timers whose values are <= <cur_time>. + * This does not account for <timer_skew>. Returns the number of + * timers canceled. + */ + virtual int expire (const ACE_Time_Value ¤t_time); + + /// Returns a pointer to this ACE_Timer_Queue's iterator. + virtual ACE_Timer_Queue_Iterator_T<TYPE, FUNCTOR, ACE_LOCK> &iter (void); + + /// Removes the earliest node from the queue and returns it + virtual ACE_Timer_Node_T<TYPE> *remove_first (void); + + /// Dump the state of an object. + virtual void dump (void) const; + + /// Reads the earliest node from the queue and returns it. + virtual ACE_Timer_Node_T<TYPE> *get_first (void); + +private: + + /** + * Schedule <type> that will expire at <future_time>, + * which is specified in absolute time. If it expires then <act> is + * passed in as the value to the <functor>. If <interval> is != to + * <ACE_Time_Value::zero> then it is used to reschedule the <type> + * automatically, using relative time to the current <gettimeofday>. + * This method returns a <timer_id> that is a pointer to a token + * which stores information about the event. This <timer_id> can be + * used to cancel the timer before it expires. Returns -1 on + * failure. + */ + virtual long schedule_i (const TYPE &type, + const void *act, + const ACE_Time_Value &future_time, + const ACE_Time_Value &interval); + + /// Non-locking version of dispatch_info () + virtual int dispatch_info_i (const ACE_Time_Value ¤t_time, + ACE_Timer_Node_Dispatch_Info_T<TYPE> &info); + + /// Reschedule an "interval" <ACE_Timer_Node>. + virtual void reschedule (ACE_Timer_Node_T<TYPE> *); + + /// Finds the earliest node + void find_new_earliest (void); + + /// Keeps track of the size of the queue + size_t size_; + + /// Table of BUCKETS + BUCKET **table_; + + /// Keeps track of the size of table_ + size_t table_size_; + + /// Functor used for the table's timer queues + ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, ACE_LOCK> table_functor_; + + /// Index to the position with the earliest entry + size_t earliest_position_; + + /// Iterator used to expire timers. + HASH_ITERATOR *iterator_; + +#if defined (ACE_WIN64) + // Part of a hack... see comments in schedule(). + // This is, essentially, the upper 32 bits of a 64-bit pointer on Win64. + ptrdiff_t pointer_base_; +#endif + + // = Don't allow these operations for now. + ACE_UNIMPLEMENTED_FUNC (ACE_Timer_Hash_T (const ACE_Timer_Hash_T<TYPE, FUNCTOR, ACE_LOCK, BUCKET> &)) + ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Timer_Hash_T<TYPE, FUNCTOR, ACE_LOCK, BUCKET> &)) +}; + +ACE_END_VERSIONED_NAMESPACE_DECL + +#if defined (ACE_TEMPLATES_REQUIRE_SOURCE) && !defined(ACE_HAS_BROKEN_HPUX_TEMPLATES) +#include "ace/Timer_Hash_T.cpp" +#endif /* ACE_TEMPLATES_REQUIRE_SOURCE && !ACE_HAS_BROKEN_HPUX_TEMPLATES */ + +#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA) +#pragma implementation ("Timer_Hash_T.cpp") +#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */ + +#include /**/ "ace/post.h" +#endif /* ACE_TIMER_HASH_T_H */ |