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author | brunsch <brunsch@ae88bc3d-4319-0410-8dbf-d08b4c9d3795> | 1997-06-04 00:28:45 +0000 |
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committer | brunsch <brunsch@ae88bc3d-4319-0410-8dbf-d08b4c9d3795> | 1997-06-04 00:28:45 +0000 |
commit | 1e92c1984331cacea0b72d9d817f28b8dacdc218 (patch) | |
tree | df56cae7425595d3da052496955161fadc6bc852 /ace/Timer_Hash_T.h | |
parent | 35d1135d0091ec71142a95fdbc7c3a3bb741ebec (diff) | |
download | ATCD-1e92c1984331cacea0b72d9d817f28b8dacdc218.tar.gz |
*** empty log message ***
Diffstat (limited to 'ace/Timer_Hash_T.h')
-rw-r--r-- | ace/Timer_Hash_T.h | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/ace/Timer_Hash_T.h b/ace/Timer_Hash_T.h new file mode 100644 index 00000000000..d6f61084c2b --- /dev/null +++ b/ace/Timer_Hash_T.h @@ -0,0 +1,234 @@ +/* -*- C++ -*- */ + +// ============================================================================ +// +// = LIBRARY +// ace +// +// = FILENAME +// Timer_Hash_T.h +// +// = AUTHOR +// Darrell Brunsch <brunsch@cs.wustl.edu> +// +// ============================================================================ + +#if !defined (ACE_TIMER_HASH_T_H) +#define ACE_TIMER_HASH_T_H + +#include "ace/Timer_Queue.h" +#include "ace/Free_List.h" + +// Forward declaration. +template <class TYPE, class FUNCTOR, class LOCK, class BUCKET> +class ACE_Timer_Hash_T; + +template <class TYPE, class FUNCTOR, class LOCK> +class ACE_Timer_Hash_Upcall + // = TITLE + // Functor for Timer_Hash + // + // = DESCRIPTION + // This class calls up to the Timer Hash's functor from the + // timer queues in the hash table +{ +public: + typedef ACE_Timer_Queue_T<ACE_Event_Handler *, + ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, LOCK>, + ACE_Null_Mutex> + TIMER_QUEUE; + + ACE_Timer_Hash_Upcall (void); + // Default constructor (creates an invalid object, but needs to be here + // so timer queues using this functor can be constructed) + + ACE_Timer_Hash_Upcall (ACE_Timer_Queue_T<TYPE, FUNCTOR, LOCK> *timer_hash); + // Constructor that specifies a Timer_Hash to call up to + + int timeout (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + const void *arg, + const ACE_Time_Value &cur_time); + // This method is called when the timer expires + + int cancellation (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler); + // This method is called when the timer is canceled + + int deletion (TIMER_QUEUE &timer_queue, + ACE_Event_Handler *handler, + const void *arg); + // This method is called when the timer queue is destroyed and + // the timer is still contained in it + +private: + ACE_Timer_Queue_T<TYPE, FUNCTOR, LOCK> *timer_hash_; + // Timer Queue to do the calling up to + + // = Don't allow these operations for now. + ACE_Timer_Hash_Upcall (const ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, LOCK> &); + void operator= (const ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, LOCK> &); +}; + +template <class TYPE, class FUNCTOR, class LOCK, class BUCKET> +class ACE_Timer_Hash_Iterator_T : public ACE_Timer_Queue_Iterator_T <TYPE, FUNCTOR, LOCK> + // = TITLE + // Iterates over an <ACE_Timer_Hash>. + // + // = DESCRIPTION + // 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. +{ +public: + ACE_Timer_Hash_Iterator_T (ACE_Timer_Hash_T<TYPE, FUNCTOR, LOCK, BUCKET> &); + // Constructor. + + virtual void first (void); + // Positions the iterator at the earliest node in the Timer Queue + + virtual void next (void); + // Positions the iterator at the next node in the Timer Queue + + virtual int isdone (void); + // Returns true when there are no more nodes in the sequence + + virtual ACE_Timer_Node_T<TYPE> *item (void); + // Returns the node at the current position in the sequence + +protected: + ACE_Timer_Hash_T<TYPE, FUNCTOR, LOCK, BUCKET> &timer_hash_; + // Pointer to the <ACE_Timer_Hash> that we are iterating over. + + size_t position_; + // Current position in <timer_hash_>'s table + + ACE_Timer_Queue_Iterator_T<TYPE, ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, LOCK>, ACE_Null_Mutex> *iter_; + // Current iterator used on <position>'s bucket +}; + +template <class TYPE, class FUNCTOR, class LOCK, class BUCKET> +class ACE_Timer_Hash_T : public ACE_Timer_Queue_T<TYPE, FUNCTOR, LOCK> + // = TITLE + // Provides a hash table of <BUCKET>s as an implementation for + // a timer queue. + // + // = DESCRIPTION + // 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. +{ +public: + typedef ACE_Timer_Hash_Iterator_T<TYPE, FUNCTOR, LOCK, BUCKET> HASH_ITERATOR; + // Type of iterator + + friend class ACE_Timer_Hash_Iterator_T<TYPE, FUNCTOR, LOCK, BUCKET>; + // Iterator is a friend + + typedef ACE_Timer_Queue_T<TYPE, FUNCTOR, LOCK> INHERITED; + // Type inherited from + + // = Initialization and termination methods. + ACE_Timer_Hash_T (size_t table_size, + FUNCTOR *upcall_functor = 0, + ACE_Free_List<ACE_Timer_Node_T <TYPE> > *freelist = 0); + // 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 (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. + + virtual ~ACE_Timer_Hash_T (void); + // Destructor + + virtual int is_empty (void) const; + // True if queue is empty, else false. + + virtual const ACE_Time_Value &earliest_time (void) const; + // Returns the time of the earlier node in the <ACE_Timer_Hash>. + + virtual long schedule (const TYPE &type, + const void *act, + const ACE_Time_Value &delay, + const ACE_Time_Value &interval = ACE_Time_Value::zero); + // Schedule <type> that will expire after <delay> amount of 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. 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 int cancel (const TYPE &type, + int dont_call_handle_close = 1); + // 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 (long timer_id, + const void **act = 0, + 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 expire (const ACE_Time_Value ¤t_time); + // 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 ACE_Timer_Queue_Iterator_T<TYPE, FUNCTOR, LOCK> &iter (void); + // Returns a pointer to this <ACE_Timer_Queue>'s iterator. + + virtual ACE_Timer_Node_T<TYPE> *remove_first (void); + // Removes the earliest node from the queue and returns it + + virtual void dump (void) const; + // Dump the state of an object. + +private: + virtual void reschedule (ACE_Timer_Node_T<TYPE> *); + // Reschedule an "interval" <ACE_Timer_Node>. + + size_t size_; + // Keeps track of the size of the queue + + BUCKET **table_; + // Table of BUCKETS + + size_t table_size_; + // Keeps track of the size of <table> + + ACE_Timer_Hash_Upcall<TYPE, FUNCTOR, LOCK> table_functor_; + // Functor used for the table's timer queues + + size_t earliest_position_; + // Index to the position with the earliest entry + + HASH_ITERATOR iterator_; + // Iterator used to expire timers. + + // = Don't allow these operations for now. + ACE_Timer_Hash_T (const ACE_Timer_Hash_T<TYPE, FUNCTOR, LOCK, BUCKET> &); + void operator= (const ACE_Timer_Hash_T<TYPE, FUNCTOR, LOCK, BUCKET> &); +}; + +#if defined (ACE_TEMPLATES_REQUIRE_SOURCE) +#include "ace/Timer_Hash_T.cpp" +#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */ + +#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA) +#pragma implementation ("Timer_Hash_T.cpp") +#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */ + +#endif /* ACE_TIMER_HASH_T_H */ |