/**
* Delete an item from the cache
* @param trx the transaction to use
* @param key the key of the item to delete
* @param nkey the length of the key
* @return true if we should go ahead and commit the transaction
* or false if we should roll back (if the key didn't exists)
*/
static bool do_delete_item(ib_trx_t trx, const void* key, size_t nkey) {
ib_crsr_t cursor= NULL;
bool retval= false;
if (do_locate_item(trx, key, nkey, &cursor))
{
checked(ib_cursor_lock(cursor, IB_LOCK_X));
checked(ib_cursor_delete_row(cursor));
retval= true;
}
/* Release resources */
/* FALLTHROUGH */
error_exit:
if (cursor != NULL)
ib_cursor_close(cursor);
return retval;
}
/**
* Try to get an item from the database
*
* @param trx the transaction to use
* @param key the key to get
* @param nkey the lenght of the key
* @return a pointer to the item if I found it in the database
*/
static struct item* do_get_item(ib_trx_t trx, const void* key, size_t nkey)
{
ib_crsr_t cursor= NULL;
ib_tpl_t tuple= NULL;
struct item* retval= NULL;
if (do_locate_item(trx, key, nkey, &cursor))
{
tuple= ib_clust_read_tuple_create(cursor);
if (tuple == NULL)
{
fprintf(stderr, "Failed to create read tuple\n");
goto error_exit;
}
checked(ib_cursor_read_row(cursor, tuple));
ib_col_meta_t meta;
ib_ulint_t datalen= ib_col_get_meta(tuple, data_col_idx, &meta);
ib_ulint_t flaglen= ib_col_get_meta(tuple, flags_col_idx, &meta);
ib_ulint_t caslen= ib_col_get_meta(tuple, cas_col_idx, &meta);
ib_ulint_t explen= ib_col_get_meta(tuple, exp_col_idx, &meta);
const void *dataptr= ib_col_get_value(tuple, data_col_idx);
retval= create_item(key, nkey, dataptr, datalen, 0, 0);
if (retval == NULL)
{
fprintf(stderr, "Failed to allocate memory\n");
goto error_exit;
}
if (flaglen != 0)
{
ib_u32_t val;
checked(ib_tuple_read_u32(tuple, flags_col_idx, &val));
retval->flags= (uint32_t)val;
}
if (caslen != 0)
{
ib_u64_t val;
checked(ib_tuple_read_u64(tuple, cas_col_idx, &val));
retval->cas= (uint64_t)val;
}
if (explen != 0)
{
ib_u32_t val;
checked(ib_tuple_read_u32(tuple, exp_col_idx, &val));
retval->exp= (time_t)val;
}
}
/* Release resources */
/* FALLTHROUGH */
error_exit:
if (tuple != NULL)
ib_tuple_delete(tuple);
if (cursor != NULL)
{
ib_err_t cursor_error;
cursor_error= ib_cursor_close(cursor);
(void) cursor_error;
}
return retval;
}
