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Allow query classifier to initialize itself

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The process and thread initialization/finalization of the query
classifier plugins is handled using the process and thread
initialization/finalization functions in the module object.

However, the top-level query classifier will also need to perform
process and thread initialization when transaction boundaries are
detected using regular expressions.
This commit is contained in:
Johan Wikman
2017-03-10 14:01:36 +02:00
parent 669d6e95f4
commit a58f944f23
8 changed files with 68 additions and 25 deletions
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30
include/maxscale/query_classifier.h
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@ -19,6 +19,16 @@ MXS_BEGIN_DECLS
#define QUERY_CLASSIFIER_VERSION {1, 1, 0}
/**
* qc_init_kind_t specifies what kind of initialization should be performed.
*/
typedef enum qc_init_kind
{
QC_INIT_SELF = 0x01, /*< Initialize/finalize the query classifier itself. */
QC_INIT_PLUGIN = 0x02, /*< Initialize/finalize the plugin. */
QC_INIT_BOTH = 0x03
} qc_init_kind_t;
/**
* qc_query_type_t defines bits that provide information about a
* particular statement.
@ -377,11 +387,14 @@ bool qc_setup(const char* plugin_name, const char* plugin_args);
*
* MaxScale calls this functions, so plugins should not do that.
*
* @param kind What kind of initialization should be performed.
* Combination of qc_init_kind_t.
*
* @return True, if the process wide initialization could be performed.
*
* @see qc_process_end qc_thread_init
*/
bool qc_process_init(void);
bool qc_process_init(uint32_t kind);
/**
* Finalizes the query classifier.
@ -390,9 +403,12 @@ bool qc_process_init(void);
* by a call to this function. MaxScale calls this function, so plugins
* should not do that.
*
* @param kind What kind of finalization should be performed.
* Combination of qc_init_kind_t.
*
* @see qc_process_init qc_thread_end
*/
void qc_process_end(void);
void qc_process_end(uint32_t kind);
/**
* Loads a particular query classifier.
@ -426,11 +442,14 @@ void qc_unload(QUERY_CLASSIFIER* classifier);
*
* MaxScale calls this function, so plugins should not do that.
*
* @param kind What kind of initialization should be performed.
* Combination of qc_init_kind_t.
*
* @return True if the initialization succeeded, false otherwise.
*
* @see qc_thread_end
*/
bool qc_thread_init(void);
bool qc_thread_init(uint32_t kind);
/**
* Performs thread finalization needed by the query classifier.
@ -439,9 +458,12 @@ bool qc_thread_init(void);
*
* MaxScale calls this function, so plugins should not do that.
*
* @param kind What kind of finalization should be performed.
* Combination of qc_init_kind_t.
*
* @see qc_thread_init
*/
void qc_thread_end(void);
void qc_thread_end(uint32_t kind);
/**
* Parses the statement in the provided buffer and returns a value specifying