Get and set a callback
-
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-LIBRARY
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-
-
-C Client Library for memcached (libmemcached, -lmemcached)
+.. index:: object: memcached_st
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.. c:function:: void * memcached_callback_get (memcached_st *ptr, memcached_callback_t flag, memcached_return_t *error);
+Compile and link with -lmemcached
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memcached_callback_set() changes the function/structure assigned by a
callback flag. No connections are reset.
-You can use MEMCACHED_CALLBACK_USER_DATA to provide custom context if required for any
-of the callbacks
+You can use MEMCACHED_CALLBACK_USER_DATA to provide custom context if required for any of the callbacks.
.. c:var:: MEMCACHED_CALLBACK_CLEANUP_FUNCTION
- When memcached_delete() is called this function will be excuted. At the
- point of its execution all connections have been closed.
+When memcached_delete() is called this function will be excuted. At the point of its execution all connections are closed.
.. c:var:: MEMCACHED_CALLBACK_CLONE_FUNCTION
- When memcached_delete() is called this function will be excuted. At the
- point of its execution all connections have been closed.
+When memcached_delete() is called this function will be excuted. At the
+point of its execution all connections are closed.
.. c:var:: MEMCACHED_CALLBACK_PREFIX_KEY
- You can set a value which will be used to create a domain for your keys.
- The value specified here will be prefixed to each of your keys. The value can not
- be greater then MEMCACHED_PREFIX_KEY_MAX_SIZE - 1 and will reduce MEMCACHED_MAX_KEY by
- the value of your key. The prefix key is only applied to the primary key,
- not the master key. MEMCACHED_FAILURE will be returned if no key is set. In the case
- of a key which is too long MEMCACHED_BAD_KEY_PROVIDED will be returned.
+You can set a value which will be used to create a domain for your keys.
+The value specified here will be prefixed to each of your keys. The value can not be greater then MEMCACHED_PREFIX_KEY_MAX_SIZE - 1 and will reduce MEMCACHED_MAX_KEY by the value of your key.
+
+The prefix key is only applied to the primary key, not the master key. MEMCACHED_FAILURE will be returned if no key is set. In the case of a key which is too long, MEMCACHED_BAD_KEY_PROVIDED will be returned.
- If you set a value with the value being NULL then the prefix key is disabled.
+If you set a value with the value being NULL then the prefix key is disabled.
.. c:var:: MEMCACHED_CALLBACK_USER_DATA
- This allows you to store a pointer to a specifc piece of data. This can be
- retrieved from inside of memcached_fetch_execute(). Cloning a memcached_st
- will copy the pointer to the clone.
+This allows you to store a pointer to a specifc piece of data. This can be
+retrieved from inside of memcached_fetch_execute(). Cloning a memcached_st
+will copy the pointer to the clone.
.. c:var:: MEMCACHED_CALLBACK_MALLOC_FUNCTION
- DEPRECATED: use memcached_set_memory_allocators instead.
+DEPRECATED: use memcached_set_memory_allocators instead.
.. c:var:: MEMCACHED_CALLBACK_REALLOC_FUNCTION
- DEPRECATED: use memcached_set_memory_allocators instead.
+DEPRECATED: use memcached_set_memory_allocators instead.
.. c:var:: MEMCACHED_CALLBACK_FREE_FUNCTION
- DEPRECATED: use memcached_set_memory_allocators instead.
+DEPRECATED: use memcached_set_memory_allocators instead.
.. c:var:: MEMCACHED_CALLBACK_GET_FAILURE
- This function implements the read through cache behavior. On failure of retrieval this callback will be called.
- You are responsible for populating the result object provided. This result object will then be stored in the server and
- returned to the calling process. You must clone the memcached_st in order to
- make use of it. The value will be stored only if you return
- MEMCACHED_SUCCESS or MEMCACHED_BUFFERED. Returning MEMCACHED_BUFFERED will
- cause the object to be buffered and not sent immediatly (if this is the default behavior based on your connection setup this will happen automatically).
+This function implements the read through cache behavior. On failure of retrieval this callback will be called.
+
+You are responsible for populating the result object provided. This result object will then be stored in the server and returned to the calling process.
+
+You must clone the memcached_st in order to
+make use of it. The value will be stored only if you return
+MEMCACHED_SUCCESS or MEMCACHED_BUFFERED. Returning MEMCACHED_BUFFERED will
+cause the object to be buffered and not sent immediatly (if this is the default behavior based on your connection setup this will happen automatically).
- The prototype for this is:
- memcached_return_t (\*memcached_trigger_key)(memcached_st \*ptr, char \*key, size_t key_length, memcached_result_st \*result);
+The prototype for this is:
+memcached_return_t (\*memcached_trigger_key)(memcached_st \*ptr, char \*key, size_t key_length, memcached_result_st \*result);
To find out more information please check:
-`https://launchpad.net/libmemcached <https://launchpad.net/libmemcached>`_
+`http://libmemcached.org/ <http://libmemcached.org/>`_
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