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#ifndef NDBMEMCACHE_KEYPREFIX_H
#define NDBMEMCACHE_KEYPREFIX_H
#include <stdio.h>
/***** This section defines a data structures available to C. ***/
/* The prefix_info_t is the compacted form of the parts of the
KeyPrefix that must be available to C code.
*/
/* The value of 13 imposes a limit of 8,192 prefixes */
#define KEY_PREFIX_BITS 13
#define MAX_KEY_PREFIXES (1 << KEY_PREFIX_BITS)
/* The value of 4 imposes a limit of 16 clusters */
#define CLUSTER_ID_BITS 4
#define MAX_CLUSTERS (1 << CLUSTER_ID_BITS)
typedef struct ndb_prefix_bitfield {
unsigned usable : 1;
unsigned use_ndb : 1;
unsigned _unused1 : 1;
unsigned prefix_id : KEY_PREFIX_BITS;
unsigned do_mc_read : 1;
unsigned do_db_read : 1;
unsigned do_mc_write : 1;
unsigned do_db_write : 1;
unsigned do_mc_delete : 1;
unsigned do_db_delete : 1;
unsigned do_db_flush : 1;
unsigned has_cas_col : 1;
unsigned has_flags_col : 1;
unsigned has_expire_col : 1;
unsigned has_math_col : 1;
unsigned cluster_id : CLUSTER_ID_BITS;
} prefix_info_t;
/***** This section is available to C++ only. ***/
#ifdef __cplusplus
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "TableSpec.h"
class KeyPrefix {
public:
/* public methods */
KeyPrefix(const char *name);
KeyPrefix(const KeyPrefix &);
~KeyPrefix();
int cmp(const char *key, int nkey);
void dump(FILE *) const;
/* public instance variables */
TableSpec *table;
prefix_info_t info;
const char *prefix;
const size_t prefix_len;
};
/**** Inline methods for KeyPrefix ****/
inline int KeyPrefix::cmp(const char *key, int nkey) {
return strncmp(prefix, key, prefix_len);
};
#endif
#endif
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