- #include "libmemcached/memcached.h"
- #include <string.h>
- #include <stdio.h>
+ #include <libmemcached/memcached.h>
+
+ #include <string>
+ #include <vector>
class Memcached
{
- memcached_st memc;
- memcached_result_st result;
-
public:
- Memcached() : memc(), result()
+ Memcached()
+ :
+ memc(),
+ result()
{
memcached_create(&memc);
}
- Memcached(memcached_st *clone) : memc(), result()
+ Memcached(memcached_st *clone)
+ :
+ memc(),
+ result()
{
memcached_clone(&memc, clone);
}
- char *fetch (char *key, size_t *key_length, size_t *value_length)
+
+ ~Memcached()
{
- uint32_t flags;
- memcached_return rc;
+ memcached_free(&memc);
+ }
- return memcached_fetch(&memc, key, key_length,
- value_length, &flags, &rc);
+ bool fetch(std::string &key,
+ std::string &ret_val,
+ size_t *key_length,
+ size_t *value_length,
+ uint32_t *flags,
+ memcached_return *rc)
+ {
+ char ret_key[MEMCACHED_MAX_KEY];
+ char *value= memcached_fetch(&memc, ret_key, key_length,
+ value_length, flags, rc);
+ if (value)
+ {
+ ret_val.assign(value);
+ key.assign(ret_key);
+ return true;
+ }
+ return false;
}
- char *get(const char *key, size_t *value_length)
+
+ std::string get(const std::string &key, size_t *value_length)
{
uint32_t flags;
memcached_return rc;
+ std::string ret_val;
- return memcached_get(&memc, key, strlen(key),
- value_length, &flags, &rc);
+ char *value= memcached_get(&memc, key.c_str(), key.length(),
+ value_length, &flags, &rc);
+ if (value)
+ {
+ ret_val.assign(value);
+ }
+ return ret_val;
}
- char *get_by_key(const char *master_key, const char *key,
- size_t *value_length)
+ std::string get_by_key(const std::string &master_key,
+ const std::string &key,
+ size_t *value_length)
{
uint32_t flags;
memcached_return rc;
+ std::string ret_val;
- return memcached_get_by_key(&memc, master_key, strlen(master_key),
- key, strlen(key),
- value_length, &flags, &rc);
+ char *value= memcached_get_by_key(&memc, master_key.c_str(), master_key.length(),
+ key.c_str(), key.length(),
+ value_length, &flags, &rc);
+ if (value)
+ {
+ ret_val.assign(value);
+ }
+ return ret_val;
}
- memcached_return mget(const char **keys, size_t *key_length,
- unsigned int number_of_keys)
+ bool mget(std::vector<std::string> &keys)
{
- size_t *key_len= static_cast<size_t *>(malloc(keys.size() * sizeof(size_t)));
- if (key_len == NULL)
- {
- return false;
- }
- std::vector<char *> real_keys;
++ std::vector<const char *> real_keys;
++ std::vector<size_t> key_len;
+ /*
+ * Construct an array which will contain the length
+ * of each of the strings in the input vector. Also, to
+ * interface with the memcached C API, we need to convert
+ * the vector of std::string's to a vector of char *.
+ */
- int i= 0;
++ real_keys.reserve(keys.size());
++ key_len.reserve(keys.size());
++
+ std::vector<std::string>::iterator it= keys.begin();
- key_len[i++]= (*it).length();
++
+ while (it != keys.end())
+ {
+ real_keys.push_back(const_cast<char *>((*it).c_str()));
- memcached_return rc= memcached_mget(&memc, &real_keys[0], key_len,
++ key_len.push_back((*it).length());
+ ++it;
+ }
+
+ /*
+ * If the std::vector of keys is empty then we cannot
+ * call memcached_mget as we will get undefined behavior.
+ */
+ if (!real_keys.empty())
+ {
++ memcached_return rc= memcached_mget(&memc, &real_keys[0], &key_len[0],
+ static_cast<unsigned int>(real_keys.size()));
+ return (rc == MEMCACHED_SUCCESS);
+ }
- return memcached_mget(&memc, keys, key_length, number_of_keys);
+ return false;
}
- memcached_return set(const char *key, const char *value, size_t value_length)
+ bool set(const std::string &key,
+ const std::string &value,
+ time_t expiration,
+ uint32_t flags)
{
- return memcached_set(&memc, key, strlen(key),
- value, value_length,
- time_t(0), uint32_t(0));
+ memcached_return rc= memcached_set(&memc,
+ key.c_str(), key.length(),
+ value.c_str(), value.length(),
+ expiration, flags);
+ return (rc == MEMCACHED_SUCCESS || rc == MEMCACHED_BUFFERED);
}
- memcached_return set_by_key(const char *master_key, const char *key,
- const char *value, size_t value_length)
+ bool set_all(std::vector<std::string> &keys,
+ std::vector<std::string> &values,
+ time_t expiration,
+ uint32_t flags)
{
- return memcached_set_by_key(&memc, master_key, strlen(master_key),
- key, strlen(key),
- value, value_length,
- time_t(0),
- uint32_t(0) );
+ if (keys.size() != values.size())
+ {
+ return false;
+ }
+ bool retval= true;
+ std::vector<std::string>::iterator key_it= keys.begin();
+ std::vector<std::string>::iterator val_it= values.begin();
+ while (key_it != keys.end())
+ {
+ retval= set((*key_it), (*val_it), expiration, flags);
+ if (retval == false)
+ {
+ return retval;
+ }
+ ++key_it;
+ ++val_it;
+ }
+ return retval;
}
- memcached_return
- increment(const char *key, unsigned int offset, uint64_t *value)
+
+ bool set_by_key(const std::string &master_key,
+ const std::string &key,
+ const std::string &value,
+ time_t expiration,
+ uint32_t flags)
{
- return memcached_increment(&memc, key, strlen(key),
- offset, value);
+ memcached_return rc= memcached_set_by_key(&memc, master_key.c_str(),
+ master_key.length(),
+ key.c_str(), key.length(),
+ value.c_str(), value.length(),
+ expiration,
+ flags);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return
- decrement(const char *key, unsigned int offset, uint64_t *value)
+
+ bool increment(const std::string &key, unsigned int offset, uint64_t *value)
+ {
+ memcached_return rc= memcached_increment(&memc, key.c_str(), key.length(),
+ offset, value);
+ return (rc == MEMCACHED_SUCCESS);
+ }
+
+ bool decrement(const std::string &key, unsigned int offset, uint64_t *value)
{
- return memcached_decrement(&memc, key, strlen(key),
- offset, value);
+ memcached_return rc= memcached_decrement(&memc, key.c_str(),
+ key.length(),
+ offset, value);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return add(const char *key, const char *value, size_t value_length)
+ bool add(const std::string &key, const std::string &value)
{
- return memcached_add(&memc, key, strlen(key), value, value_length, 0, 0);
+ memcached_return rc= memcached_add(&memc, key.c_str(), key.length(),
+ value.c_str(), value.length(), 0, 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return add_by_key(const char *master_key, const char *key,
- const char *value, size_t value_length)
+
+ bool add_by_key(const std::string &master_key,
+ const std::string &key,
+ const std::string &value)
{
- return memcached_add_by_key(&memc, master_key, strlen(master_key),
- key, strlen(key),
- value, value_length,
- 0, 0);
+ memcached_return rc= memcached_add_by_key(&memc,
+ master_key.c_str(),
+ master_key.length(),
+ key.c_str(),
+ key.length(),
+ value.c_str(),
+ value.length(),
+ 0, 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return replace(const char *key, const char *value,
- size_t value_length)
+ bool replace(const std::string &key, const std::string &value)
{
- return memcached_replace(&memc, key, strlen(key),
- value, value_length,
- 0, 0);
+ memcached_return rc= memcached_replace(&memc, key.c_str(), key.length(),
+ value.c_str(), value.length(),
+ 0, 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return replace_by_key(const char *master_key, const char *key,
- const char *value, size_t value_length)
+
+ bool replace_by_key(const std::string &master_key,
+ const std::string &key,
+ const std::string &value)
{
- return memcached_replace_by_key(&memc, master_key, strlen(master_key),
- key, strlen(key),
- value, value_length, 0, 0);
+ memcached_return rc= memcached_replace_by_key(&memc,
+ master_key.c_str(),
+ master_key.length(),
+ key.c_str(),
+ key.length(),
+ value.c_str(),
+ value.length(),
+ 0, 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return prepend(const char *key, const char *value,
- size_t value_length)
+ bool prepend(const std::string &key, const std::string &value)
{
- return memcached_prepend(&memc, key, strlen(key),
- value, value_length, 0, 0);
+ memcached_return rc= memcached_prepend(&memc, key.c_str(), key.length(),
+ value.c_str(), value.length(), 0, 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return prepend_by_key(const char *master_key, const char *key,
- const char *value, size_t value_length)
+
+ bool prepend_by_key(const std::string &master_key,
+ const std::string &key,
+ const std::string &value)
{
- return memcached_prepend_by_key(&memc, master_key, strlen(master_key),
- key, strlen(key),
- value, value_length,
- 0,
- 0);
+ memcached_return rc= memcached_prepend_by_key(&memc,
+ master_key.c_str(),
+ master_key.length(),
+ key.c_str(),
+ key.length(),
+ value.c_str(),
+ value.length(),
+ 0,
+ 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return append(const char *key, const char *value,
- size_t value_length)
+ bool append(const std::string &key, const std::string &value)
{
- return memcached_append(&memc, key, strlen(key),
- value, value_length, 0, 0);
+ memcached_return rc= memcached_append(&memc,
+ key.c_str(),
+ key.length(),
+ value.c_str(),
+ value.length(),
+ 0, 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return append_by_key(const char *master_key, const char *key,
- const char *value, size_t value_length)
+
+ bool append_by_key(const std::string &master_key,
+ const std::string &key,
+ const std::string &value)
{
- return memcached_append_by_key(&memc,
- master_key, strlen(master_key),
- key, strlen(key),
- value, value_length, 0, 0);
+ memcached_return rc= memcached_append_by_key(&memc,
+ master_key.c_str(),
+ master_key.length(),
+ key.c_str(),
+ key.length(),
+ value.c_str(),
+ value.length(),
+ 0, 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return cas(const char *key, const char *value,
- size_t value_length, uint64_t cas_arg)
+
+ bool cas(const std::string &key,
+ const std::string &value,
+ uint64_t cas_arg)
{
- return memcached_cas(&memc, key, strlen(key),
- value, value_length, 0, 0, cas_arg);
+ memcached_return rc= memcached_cas(&memc, key.c_str(), key.length(),
+ value.c_str(), value.length(),
+ 0, 0, cas_arg);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return cas_by_key(const char *master_key, const char *key,
- const char *value, size_t value_length,
- uint64_t cas_arg)
+
+ bool cas_by_key(const std::string &master_key,
+ const std::string &key,
+ const std::string &value,
+ uint64_t cas_arg)
{
- return memcached_cas_by_key(&memc,
- master_key, strlen(master_key),
- key, strlen(key),
- value, value_length,
- 0, 0, cas_arg);
+ memcached_return rc= memcached_cas_by_key(&memc,
+ master_key.c_str(),
+ master_key.length(),
+ key.c_str(),
+ key.length(),
+ value.c_str(),
+ value.length(),
+ 0, 0, cas_arg);
+ return (rc == MEMCACHED_SUCCESS);
}
+
// using 'remove' vs. 'delete' since 'delete' is a keyword
- memcached_return remove(const char *key)
+ bool remove(const std::string &key)
{
- return memcached_delete (&memc, key, strlen(key), 0);
+ memcached_return rc= memcached_delete(&memc, key.c_str(), key.length(), 0);
+ return (rc == MEMCACHED_SUCCESS);
+ }
+ bool delete_by_key(const std::string &master_key,
+ const std::string &key)
+ {
+ memcached_return rc= memcached_delete_by_key(&memc,
+ master_key.c_str(),
+ master_key.length(),
+ key.c_str(),
+ key.length(),
+ 0);
+ return (rc == MEMCACHED_SUCCESS);
}
- memcached_return delete_by_key(const char *master_key, const char *key)
+
+ bool flush(time_t expiration)
{
- return memcached_delete_by_key(&memc, master_key, strlen(master_key),
- key, strlen(key), 0);
+ memcached_return rc= memcached_flush(&memc, expiration);
+ return (rc == MEMCACHED_SUCCESS);
}
- ~Memcached()
+
+ bool fetch_execute(memcached_execute_function *callback,
+ void *context,
+ unsigned int num_of_callbacks)
{
- memcached_free(&memc);
+ memcached_return rc= memcached_fetch_execute(&memc,
+ callback,
+ context,
+ num_of_callbacks);
+ return (rc == MEMCACHED_SUCCESS);
}
+
+ const std::string lib_version() const
+ {
+ const char *ver= memcached_lib_version();
+ const std::string version(ver);
+ return version;
+ }
+
+ private:
+ memcached_st memc;
+ memcached_result_st result;
};
projects / m6w6 / libmemcached / commitdiff
