-#include "common.h"
-
+/* LibMemcached
+ * Copyright (C) 2006-2010 Brian Aker
+ * All rights reserved.
+ *
+ * Use and distribution licensed under the BSD license. See
+ * the COPYING file in the parent directory for full text.
+ *
+ * Summary:
+ *
+ */
-/* Defines */
-static uint64_t FNV_64_INIT= UINT64_C(0xcbf29ce484222325);
-static uint64_t FNV_64_PRIME= UINT64_C(0x100000001b3);
-
-static uint32_t FNV_32_INIT= 2166136261UL;
-static uint32_t FNV_32_PRIME= 16777619;
+#include "common.h"
-/* Prototypes */
-static uint32_t internal_generate_hash(const char *key, size_t key_length);
-static uint32_t internal_generate_md5(const char *key, size_t key_length);
uint32_t memcached_generate_hash_value(const char *key, size_t key_length, memcached_hash_t hash_algorithm)
{
- uint32_t hash= 1; /* Just here to remove compile warning */
- uint32_t x= 0;
-
- switch (hash_algorithm)
- {
- case MEMCACHED_HASH_DEFAULT:
- hash= internal_generate_hash(key, key_length);
- break;
- case MEMCACHED_HASH_MD5:
- hash= internal_generate_md5(key, key_length);
- break;
- case MEMCACHED_HASH_CRC:
- hash= ((hash_crc32(key, key_length) >> 16) & 0x7fff);
- if (hash == 0)
- hash= 1;
- break;
- /* FNV hash'es lifted from Dustin Sallings work */
- case MEMCACHED_HASH_FNV1_64:
- {
- /* Thanks to pierre@demartines.com for the pointer */
- uint64_t temp_hash;
-
- temp_hash= FNV_64_INIT;
- for (x= 0; x < key_length; x++)
- {
- temp_hash *= FNV_64_PRIME;
- temp_hash ^= (uint64_t)key[x];
- }
- hash= (uint32_t)temp_hash;
- }
- break;
- case MEMCACHED_HASH_FNV1A_64:
- {
- hash= (uint32_t) FNV_64_INIT;
- for (x= 0; x < key_length; x++)
- {
- uint32_t val= (uint32_t)key[x];
- hash ^= val;
- hash *= (uint32_t) FNV_64_PRIME;
- }
- }
- break;
- case MEMCACHED_HASH_FNV1_32:
- {
- hash= FNV_32_INIT;
- for (x= 0; x < key_length; x++)
- {
- uint32_t val= (uint32_t)key[x];
- hash *= FNV_32_PRIME;
- hash ^= val;
- }
- }
- break;
- case MEMCACHED_HASH_FNV1A_32:
- {
- hash= FNV_32_INIT;
- for (x= 0; x < key_length; x++)
- {
- uint32_t val= (uint32_t)key[x];
- hash ^= val;
- hash *= FNV_32_PRIME;
- }
- }
- break;
- case MEMCACHED_HASH_HSIEH:
- {
-#ifdef HAVE_HSIEH_HASH
- hash= hsieh_hash(key, key_length);
-#endif
- break;
- }
- case MEMCACHED_HASH_MURMUR:
- {
- hash= murmur_hash(key, key_length);
- break;
- }
- case MEMCACHED_HASH_JENKINS:
- {
- hash=jenkins_hash(key, key_length, 13);
- break;
- }
- default:
- {
- WATCHPOINT_ASSERT(hash_algorithm);
- break;
- }
- }
- return hash;
+ return libhashkit_digest(key, key_length, (hashkit_hash_algorithm_t)hash_algorithm);
}
-uint32_t generate_hash(memcached_st *ptr, const char *key, size_t key_length)
+static inline uint32_t generate_hash(const memcached_st *ptr, const char *key, size_t key_length)
{
- uint32_t hash= 1; /* Just here to remove compile warning */
-
-
- WATCHPOINT_ASSERT(ptr->number_of_hosts);
-
- if (ptr->number_of_hosts == 1)
- return 0;
-
- hash= memcached_generate_hash_value(key, key_length, ptr->hash);
- WATCHPOINT_ASSERT(hash);
- return hash;
+ return hashkit_digest(&ptr->hashkit, key, key_length);
}
-static uint32_t dispatch_host(memcached_st *ptr, uint32_t hash)
+static uint32_t dispatch_host(const memcached_st *ptr, uint32_t hash)
{
switch (ptr->distribution)
{
return right->index;
}
case MEMCACHED_DISTRIBUTION_MODULA:
- return hash % ptr->number_of_hosts;
+ return hash % memcached_server_count(ptr);
case MEMCACHED_DISTRIBUTION_RANDOM:
- return (uint32_t) random() % ptr->number_of_hosts;
+ return (uint32_t) random() % memcached_server_count(ptr);
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_MAX:
default:
WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
- return hash % ptr->number_of_hosts;
+ return hash % memcached_server_count(ptr);
}
-
/* NOTREACHED */
}
/*
- One day make this public, and have it return the actual memcached_server_st
- to the calling application.
+ One version is public and will not modify the distribution hash, the other will.
*/
-uint32_t memcached_generate_hash(memcached_st *ptr, const char *key, size_t key_length)
+static inline uint32_t _generate_hash_wrapper(const memcached_st *ptr, const char *key, size_t key_length)
{
- uint32_t hash= 1; /* Just here to remove compile warning */
+ WATCHPOINT_ASSERT(memcached_server_count(ptr));
- WATCHPOINT_ASSERT(ptr->number_of_hosts);
-
- if (ptr->number_of_hosts == 1)
+ if (memcached_server_count(ptr) == 1)
return 0;
if (ptr->flags.hash_with_prefix_key)
strncpy(temp, ptr->prefix_key, ptr->prefix_key_length);
strncpy(temp + ptr->prefix_key_length, key, key_length);
- hash= generate_hash(ptr, temp, temp_length);
+
+ return generate_hash(ptr, temp, temp_length);
}
else
{
- hash= generate_hash(ptr, key, key_length);
+ return generate_hash(ptr, key, key_length);
}
+}
- WATCHPOINT_ASSERT(hash);
-
- if (memcached_behavior_get(ptr, MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS) && ptr->next_distribution_rebuild) {
+static inline void _regen_for_auto_eject(memcached_st *ptr)
+{
+ if (_is_auto_eject_host(ptr) && ptr->next_distribution_rebuild)
+ {
struct timeval now;
if (gettimeofday(&now, NULL) == 0 &&
now.tv_sec > ptr->next_distribution_rebuild)
+ {
run_distribution(ptr);
+ }
}
+}
- return dispatch_host(ptr, hash);
+void memcached_autoeject(memcached_st *ptr)
+{
+ _regen_for_auto_eject(ptr);
}
-static uint32_t internal_generate_hash(const char *key, size_t key_length)
+uint32_t memcached_generate_hash_with_redistribution(memcached_st *ptr, const char *key, size_t key_length)
{
- const char *ptr= key;
- uint32_t value= 0;
+ uint32_t hash= _generate_hash_wrapper(ptr, key, key_length);
- while (key_length--)
- {
- uint32_t val= (uint32_t) *ptr++;
- value += val;
- value += (value << 10);
- value ^= (value >> 6);
- }
- value += (value << 3);
- value ^= (value >> 11);
- value += (value << 15);
+ _regen_for_auto_eject(ptr);
- return value == 0 ? 1 : (uint32_t) value;
+ return dispatch_host(ptr, hash);
}
-static uint32_t internal_generate_md5(const char *key, size_t key_length)
+uint32_t memcached_generate_hash(const memcached_st *ptr, const char *key, size_t key_length)
{
- unsigned char results[16];
+ return dispatch_host(ptr, _generate_hash_wrapper(ptr, key, key_length));
+}
- md5_signature((unsigned char*)key, (unsigned int)key_length, results);
+const hashkit_st *memcached_get_hashkit(const memcached_st *ptr)
+{
+ return &ptr->hashkit;
+}
+
+memcached_return_t memcached_set_hashkit(memcached_st *self, hashkit_st *hashk)
+{
+ hashkit_free(&self->hashkit);
+ hashkit_clone(&self->hashkit, hashk);
- return ((uint32_t) (results[3] & 0xFF) << 24)
- | ((uint32_t) (results[2] & 0xFF) << 16)
- | ((uint32_t) (results[1] & 0xFF) << 8)
- | (results[0] & 0xFF);
+ return MEMCACHED_SUCCESS;
}
projects / awesomized / libmemcached / blobdiff