+static int continuum_item_cmp(const void *t1, const void *t2)
+{
+ memcached_continuum_item_st *ct1= (memcached_continuum_item_st *)t1;
+ memcached_continuum_item_st *ct2= (memcached_continuum_item_st *)t2;
+
+ /* Why 153? Hmmm... */
+ WATCHPOINT_ASSERT(ct1->value != 153);
+ if (ct1->value == ct2->value)
+ return 0;
+ else if (ct1->value > ct2->value)
+ return 1;
+ else
+ return -1;
+}
+
+memcached_return update_continuum(memcached_st *ptr)
+{
+ uint32_t index;
+ uint32_t host_index;
+ uint32_t continuum_index= 0;
+ uint32_t value;
+ memcached_server_st *list;
+ uint32_t pointer_counter= 0;
+ uint32_t pointer_per_server= MEMCACHED_POINTS_PER_SERVER;
+ memcached_return rc;
+ uint64_t total_mem_bytes= 0;
+ memcached_stat_st *stat_p= NULL;
+ uint32_t is_ketama_weighted= 0;
+
+ if (ptr->number_of_hosts > ptr->continuum_count)
+ {
+ memcached_continuum_item_st *new_ptr;
+
+ if (ptr->call_realloc)
+ new_ptr= (memcached_continuum_item_st *)ptr->call_realloc(ptr, ptr->continuum, sizeof(memcached_continuum_item_st) * (ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION) * MEMCACHED_POINTS_PER_SERVER);
+ else
+ new_ptr= (memcached_continuum_item_st *)realloc(ptr->continuum, sizeof(memcached_continuum_item_st) * (ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION) * MEMCACHED_POINTS_PER_SERVER);
+
+ if (new_ptr == 0)
+ return MEMCACHED_MEMORY_ALLOCATION_FAILURE;
+
+ ptr->continuum= new_ptr;
+ ptr->continuum_count= ptr->number_of_hosts + MEMCACHED_CONTINUUM_ADDITION;
+ }
+
+ list = ptr->hosts;
+
+ is_ketama_weighted= memcached_behavior_get(ptr, MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED);
+ if(is_ketama_weighted)
+ {
+ stat_p = memcached_stat(ptr, NULL, &rc);
+ for (host_index = 0; host_index < ptr->number_of_hosts; ++host_index)
+ {
+ list[host_index].limit_maxbytes= (stat_p + host_index)->limit_maxbytes;
+ total_mem_bytes += (stat_p + host_index)->limit_maxbytes;
+ }
+ }
+
+ for (host_index = 0; host_index < ptr->number_of_hosts; ++host_index)
+ {
+ if(is_ketama_weighted)
+ {
+ float pct = (float)list[host_index].limit_maxbytes/ (float)total_mem_bytes;
+ pointer_per_server= floorf( pct * MEMCACHED_POINTS_PER_SERVER * (float)(ptr->number_of_hosts));
+#ifdef HAVE_DEBUG
+ printf("ketama_weighted:%s|%d|%llu|%u\n",
+ list[host_index].hostname,
+ list[host_index].port,
+ (unsigned long long)list[host_index].limit_maxbytes,
+ pointer_per_server);
+#endif
+ }
+ for(index= 1; index <= pointer_per_server; ++index)
+ {
+ char sort_host[MEMCACHED_MAX_HOST_SORT_LENGTH]= "";
+ size_t sort_host_length;
+
+ sort_host_length= snprintf(sort_host, MEMCACHED_MAX_HOST_SORT_LENGTH, "%s:%d-%d",
+ list[host_index].hostname, list[host_index].port, index);
+ WATCHPOINT_ASSERT(sort_host_length);
+ value= generate_hash_value(sort_host, sort_host_length, ptr->hash_continuum);
+ ptr->continuum[continuum_index].index= host_index;
+ ptr->continuum[continuum_index++].value= value;
+ }
+ pointer_counter+= pointer_per_server;
+ }
+
+ WATCHPOINT_ASSERT(ptr);
+ WATCHPOINT_ASSERT(ptr->continuum);
+ WATCHPOINT_ASSERT(ptr->number_of_hosts);
+ WATCHPOINT_ASSERT(ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER <= MEMCACHED_CONTINUUM_SIZE);
+ ptr->continuum_points_counter= pointer_counter;
+ qsort(ptr->continuum, ptr->continuum_points_counter, sizeof(memcached_continuum_item_st), continuum_item_cmp);
+
+ if (stat_p)
+ memcached_stat_free(NULL, stat_p);
+
+#ifdef HAVE_DEBUG
+ for (index= 0; index < ((ptr->number_of_hosts * MEMCACHED_POINTS_PER_SERVER) - 1); index++)
+ {
+ WATCHPOINT_ASSERT(ptr->continuum[index].value <= ptr->continuum[index + 1].value);
+ }
+#endif
+
+ return MEMCACHED_SUCCESS;
+}
+
+