--- /dev/null
+/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
+ *
+ * Libmemcached library
+ *
+ * Copyright (C) 2011 Data Differential, http://datadifferential.com/
+ * Copyright (C) 2006-2009 Brian Aker All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * * The names of its contributors may not be used to endorse or
+ * promote products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#include <libmemcached/common.h>
+
+#include <sys/time.h>
+
+#include <libmemcached/virtual_bucket.h>
+
+uint32_t memcached_generate_hash_value(const char *key, size_t key_length, memcached_hash_t hash_algorithm)
+{
+ return libhashkit_digest(key, key_length, (hashkit_hash_algorithm_t)hash_algorithm);
+}
+
+static inline uint32_t generate_hash(const Memcached *ptr, const char *key, size_t key_length)
+{
+ return hashkit_digest(&ptr->hashkit, key, key_length);
+}
+
+static uint32_t dispatch_host(const Memcached *ptr, uint32_t hash)
+{
+ switch (ptr->distribution)
+ {
+ case MEMCACHED_DISTRIBUTION_CONSISTENT:
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED:
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA:
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY:
+ {
+ uint32_t num= ptr->ketama.continuum_points_counter;
+ WATCHPOINT_ASSERT(ptr->ketama.continuum);
+
+ memcached_continuum_item_st *begin, *end, *left, *right, *middle;
+ begin= left= ptr->ketama.continuum;
+ end= right= ptr->ketama.continuum + num;
+
+ while (left < right)
+ {
+ middle= left + (right - left) / 2;
+ if (middle->value < hash)
+ left= middle + 1;
+ else
+ right= middle;
+ }
+ if (right == end)
+ right= begin;
+ return right->index;
+ }
+ case MEMCACHED_DISTRIBUTION_MODULA:
+ return hash % memcached_server_count(ptr);
+ case MEMCACHED_DISTRIBUTION_RANDOM:
+ return (uint32_t) random() % memcached_server_count(ptr);
+ case MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET:
+ {
+ return memcached_virtual_bucket_get(ptr, hash);
+ }
+ default:
+ case MEMCACHED_DISTRIBUTION_CONSISTENT_MAX:
+ WATCHPOINT_ASSERT(0); /* We have added a distribution without extending the logic */
+ return hash % memcached_server_count(ptr);
+ }
+ /* NOTREACHED */
+}
+
+/*
+ One version is public and will not modify the distribution hash, the other will.
+*/
+static inline uint32_t _generate_hash_wrapper(const Memcached *ptr, const char *key, size_t key_length)
+{
+ WATCHPOINT_ASSERT(memcached_server_count(ptr));
+
+ if (memcached_server_count(ptr) == 1)
+ return 0;
+
+ if (ptr->flags.hash_with_namespace)
+ {
+ size_t temp_length= memcached_array_size(ptr->_namespace) + key_length;
+ char temp[MEMCACHED_MAX_KEY];
+
+ if (temp_length > MEMCACHED_MAX_KEY -1)
+ return 0;
+
+ strncpy(temp, memcached_array_string(ptr->_namespace), memcached_array_size(ptr->_namespace));
+ strncpy(temp + memcached_array_size(ptr->_namespace), key, key_length);
+
+ return generate_hash(ptr, temp, temp_length);
+ }
+ else
+ {
+ return generate_hash(ptr, key, key_length);
+ }
+}
+
+static inline void _regen_for_auto_eject(Memcached *ptr)
+{
+ if (_is_auto_eject_host(ptr) && ptr->ketama.next_distribution_rebuild)
+ {
+ struct timeval now;
+
+ if (gettimeofday(&now, NULL) == 0 and
+ now.tv_sec > ptr->ketama.next_distribution_rebuild)
+ {
+ run_distribution(ptr);
+ }
+ }
+}
+
+void memcached_autoeject(memcached_st *ptr)
+{
+ _regen_for_auto_eject(ptr);
+}
+
+uint32_t memcached_generate_hash_with_redistribution(memcached_st *ptr, const char *key, size_t key_length)
+{
+ uint32_t hash= _generate_hash_wrapper(ptr, key, key_length);
+
+ _regen_for_auto_eject(ptr);
+
+ return dispatch_host(ptr, hash);
+}
+
+uint32_t memcached_generate_hash(const memcached_st *shell, const char *key, size_t key_length)
+{
+ const Memcached* ptr= memcached2Memcached(shell);
+ if (ptr)
+ {
+ return dispatch_host(ptr, _generate_hash_wrapper(ptr, key, key_length));
+ }
+
+ return UINT32_MAX;
+}
+
+const hashkit_st *memcached_get_hashkit(const memcached_st *shell)
+{
+ const Memcached* ptr= memcached2Memcached(shell);
+ if (ptr)
+ {
+ return &ptr->hashkit;
+ }
+
+ return NULL;
+}
+
+memcached_return_t memcached_set_hashkit(memcached_st *shell, hashkit_st *hashk)
+{
+ Memcached* self= memcached2Memcached(shell);
+ if (self)
+ {
+ hashkit_free(&self->hashkit);
+ hashkit_clone(&self->hashkit, hashk);
+
+ return MEMCACHED_SUCCESS;
+ }
+
+ return MEMCACHED_INVALID_ARGUMENTS;
+}
+
+const char * libmemcached_string_hash(memcached_hash_t type)
+{
+ return libhashkit_string_hash((hashkit_hash_algorithm_t)type);
+}
projects / awesomized / libmemcached / blobdiff