proxysql/include/query_cache.h____

#ifndef __CLASS_QUERY_CACHE_H
#define __CLASS_QUERY_CACHE_H
#include "proxysql.h"
#include "cpp.h"


/*
#define EXPIRE_DROPIT	0
#define SHARED_QUERY_CACHE_HASH_TABLES	16
#define HASH_EXPIRE_MAX	3600*24*365*10
#define DEFAULT_purge_loop_time 400000
#define DEFAULT_purge_total_time 10000000
#define DEFAULT_purge_threshold_pct_min	50
#define DEFAULT_purge_threshold_pct_max	90

*/

#define DEFAULT_SQC_size  64*1024*1024
/*
typedef struct __fdb_hash_t fdb_hash_t;
typedef struct __fdb_hash_entry fdb_hash_entry;
*/
/*
struct __fdb_hash_t {
		pthread_rwlock_t lock;
		GHashTable *hash;
		GPtrArray *ptrArray;
		uint64_t dataSize;
		uint64_t purgeChunkSize;
		uint64_t purgeIdx;
};




struct __fdb_hash_entry {
	unsigned char *key;
	unsigned char *value;
	fdb_hash_t *hash;
	struct __fdb_hash_entry *self;
	uint32_t klen;
	uint32_t length;
	time_t expire;
	time_t access;
	uint32_t ref_count;
};
*/



class Query_Cache {
	public:
	virtual void * purgeHash_thread(void *);
	//GPtrArray *LQCs;	// array of Local Query Cache . These are used to update QCnow from the Shared_Query_Cache
	int size;
	int shutdown;
	time_t QCnow;
	pthread_t purge_thread_id;
	//fdb_hash_t fdb_hashes[SHARED_QUERY_CACHE_HASH_TABLES];
	unsigned int purge_loop_time;
	unsigned int purge_total_time;
	unsigned int purge_threshold_pct_min;
	unsigned int purge_threshold_pct_max;
//	unsigned int hash_expire_default;
	uint64_t max_memory_size;
	uint64_t cntDel;
	uint64_t cntGet;
	uint64_t cntGetOK;
	uint64_t cntSet;
	uint64_t cntSetERR;
	uint64_t cntPurge;
	uint64_t size_keys;
	uint64_t size_values;
	uint64_t size_metas;
	uint64_t dataIN;
	uint64_t dataOUT;
//	Shared_Query_Cache();
	Query_Cache(uint64_t _max_memory_size=DEFAULT_SQC_size);
	~Query_Cache();
	virtual bool set(unsigned char *, uint32_t, unsigned char *, uint32_t, time_t);
	virtual unsigned char * get(const unsigned char *);
	virtual uint64_t flush();	
	virtual uint64_t current_free_memory();
	virtual unsigned int current_used_memory_pct();
//	void register_LQC(Local_Query_Cache *);
//	void unregister_LQC(Local_Query_Cache *);
};


// the types of the class factories
typedef Query_Cache* create_QueryCache();
typedef void destroy_QueryCache(Query_Cache*);

#endif /* __CLASS_QUERY_CACHE_H */