ACE/apps/JAWS2/JAWS/Cache_Hash_T.cpp

   1 #ifndef JAWS_CACHE_HASH_T_CPP
   2 #define JAWS_CACHE_HASH_T_CPP
   3
   4 #include "JAWS/Cache_Hash_T.h"
   5 #include "JAWS/Hash_Bucket_T.h"
   6
   7 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> unsigned long
   8 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::hash (const EXT_ID &ext_id) const
   9 {
  10   return HASH_FUNC (ext_id) % this->size_;
  11 }
  12
  13 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> bool
  14 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::isprime (size_t number) const
  15 {
  16   size_t d = 3;
  17
  18   if (number <= 2) return (number == 2);
  19
  20   if (number % 2 == 0) return 0;
  21
  22   while (d <= number/d)
  23     {
  24       if (number % d == 0) return 0;
  25       d += 2;
  26     }
  27
  28   return 1;
  29 }
  30
  31 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
  32 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::new_cachebucket (size_t hash_idx)
  33 {
  34   if (this->hashtable_[hash_idx] == 0)
  35     {
  36       size_t alloc_size = sizeof (CACHE_BUCKET_MANAGER);
  37       ACE_NEW_MALLOC_RETURN (this->hashtable_[hash_idx],
  38                              (CACHE_BUCKET_MANAGER *)
  39                              this->allocator_->malloc (alloc_size),
  40                              CACHE_BUCKET_MANAGER (this->allocator_), -1);
  41     }
  42
  43   return 0;
  44 }
  45
  46 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC>
  47 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::JAWS_Cache_Hash (ACE_Allocator *alloc,
  48                                                           size_t size)
  49   : allocator_ (alloc),
  50     hashtable_ (0)
  51 {
  52   while (!this->isprime (size))
  53     size++;
  54
  55   this->size_ = size;
  56
  57   if (this->allocator_ == 0)
  58     this->allocator_ = ACE_Allocator::instance ();
  59
  60   size_t memsize = this->size_ * sizeof (CACHE_BUCKET_MANAGER *);
  61
  62   this->hashtable_
  63     = (CACHE_BUCKET_MANAGER **) this->allocator_->malloc (memsize);
  64
  65   if (this->hashtable_)
  66     {
  67       for (size_t i = 0; i < this->size_; i++)
  68         this->hashtable_[i] = 0;
  69     }
  70   else
  71     {
  72       this->size_ = 0;
  73       // should indicate something is wrong to the user.
  74     }
  75 }
  76
  77 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC>
  78 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::~JAWS_Cache_Hash (void)
  79 {
  80   if (this->hashtable_)
  81     {
  82       for (size_t i = 0; i < this->size_; i++)
  83         {
  84           if (this->hashtable_[i])
  85             {
  86
  87               ACE_DES_FREE_TEMPLATE3(this->hashtable_[i],
  88                                      this->allocator_->free,
  89                                      JAWS_Hash_Bucket_Manager,
  90                                      EXT_ID,
  91                                      JAWS_Cache_Object *,
  92                                      EQ_FUNC);
  93
  94
  95
  96
  97
  98               this->hashtable_[i] = 0;
  99             }
 100         }
 101       this->allocator_->free (this->hashtable_);
 102       this->hashtable_ = 0;
 103     }
 104
 105   this->allocator_ = 0;
 106 }
 107
 108 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 109 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::find (const EXT_ID &ext_id) const
 110 {
 111   unsigned long hash_idx = this->hash (ext_id);
 112
 113   if (this->hashtable_[hash_idx] == 0)
 114     return -1;
 115
 116   return this->hashtable_[hash_idx]->find (ext_id);
 117 }
 118
 119 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 120 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::find (const EXT_ID &ext_id,
 121                                                 JAWS_Cache_Object *&int_id) const
 122 {
 123   unsigned long hash_idx = this->hash (ext_id);
 124
 125   if (this->hashtable_[hash_idx] == 0)
 126     return -1;
 127
 128   return this->hashtable_[hash_idx]->find (ext_id, int_id);
 129 }
 130
 131 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 132 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::bind (const EXT_ID &ext_id,
 133                                                 JAWS_Cache_Object *const &int_id)
 134 {
 135   int result;
 136   unsigned long hash_idx = this->hash (ext_id);
 137
 138   if (this->hashtable_[hash_idx] == 0)
 139     {
 140       ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, g, this->lock_, -1);
 141
 142       if (this->new_cachebucket (hash_idx) == -1)
 143         return -1;
 144
 145       result = this->hashtable_[hash_idx]->bind (ext_id, int_id);
 146     }
 147   else
 148     result = this->hashtable_[hash_idx]->bind (ext_id, int_id);
 149
 150   return result;
 151 }
 152
 153 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 154 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::trybind (const EXT_ID &ext_id,
 155                                                    JAWS_Cache_Object *&int_id)
 156 {
 157   int result;
 158   unsigned long hash_idx = this->hash (ext_id);
 159
 160   if (this->hashtable_[hash_idx] == 0)
 161     {
 162       ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, g, this->lock_, -1);
 163
 164       if (this->new_cachebucket (hash_idx) == -1)
 165         return -1;
 166
 167       result = this->hashtable_[hash_idx]->trybind (ext_id, int_id);
 168     }
 169   else
 170     result = this->hashtable_[hash_idx]->trybind (ext_id, int_id);
 171
 172   return result;
 173 }
 174
 175 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 176 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::rebind (const EXT_ID &ext_id,
 177                                                   JAWS_Cache_Object *const &int_id,
 178                                                   EXT_ID &old_ext_id,
 179                                                   JAWS_Cache_Object *&old_int_id)
 180 {
 181   int result;
 182   unsigned long hash_idx = this->hash (ext_id);
 183
 184   if (this->hashtable_[hash_idx] == 0)
 185     {
 186       ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, g, this->lock_, -1);
 187
 188       if (this->new_cachebucket (hash_idx) == -1)
 189         return -1;
 190
 191       result = this->hashtable_[hash_idx]->rebind (ext_id, int_id,
 192                                                    old_ext_id, old_int_id);
 193     }
 194   else
 195     result = this->hashtable_[hash_idx]->rebind (ext_id, int_id,
 196                                                  old_ext_id, old_int_id);
 197
 198   return result;
 199 }
 200
 201
 202 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 203 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::unbind (const EXT_ID &ext_id)
 204 {
 205   unsigned long hash_idx = this->hash (ext_id);
 206
 207   if (this->hashtable_[hash_idx] == 0)
 208     return -1;
 209
 210   return this->hashtable_[hash_idx]->unbind (ext_id);
 211 }
 212
 213 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> int
 214 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::unbind (const EXT_ID &ext_id,
 215                                                   JAWS_Cache_Object *&int_id)
 216 {
 217   unsigned long hash_idx = this->hash (ext_id);
 218
 219   if (this->hashtable_[hash_idx] == 0)
 220     return -1;
 221
 222   return this->hashtable_[hash_idx]->unbind (ext_id, int_id);
 223 }
 224
 225
 226 template <class EXT_ID, class HASH_FUNC, class EQ_FUNC> size_t
 227 JAWS_Cache_Hash<EXT_ID,HASH_FUNC,EQ_FUNC>::size (void) const
 228 {
 229   return this->size_;
 230 }
 231
 232
 233
 234
 235 #endif /* JAWS_CACHEHASH_T_CPP */