func (db *DB) Open(name string, createIfMissing bool, maxOpenFiles int,
writeBufSize int, cacheSize int64, compression int) error {
db.opt = C.rocksdb_options_create()
C.rocksdb_options_set_create_if_missing(db.opt, boolToUchar(createIfMissing))
C.rocksdb_options_set_write_buffer_size(db.opt, C.size_t(writeBufSize))
C.rocksdb_options_set_max_open_files(db.opt, C.int(maxOpenFiles))
C.rocksdb_options_set_compression(db.opt, C.int(compression))
var block_options = C.rocksdb_block_based_options_create()
if cacheSize > 0 {
db.cache = C.rocksdb_cache_create_lru(C.size_t(cacheSize))
C.rocksdb_block_based_options_set_block_cache(block_options, db.cache)
} else {
C.rocksdb_block_based_options_set_no_block_cache(block_options, 1)
}
db.fp = C.rocksdb_filterpolicy_create_bloom(10)
C.rocksdb_block_based_options_set_filter_policy(block_options, db.fp)
C.rocksdb_options_set_block_based_table_factory(db.opt, block_options)
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
var errStr *C.char
db.db = C.rocksdb_open(db.opt, cname, &errStr)
if errStr != nil {
defer C.free(unsafe.Pointer(errStr))
return errors.New(C.GoString(errStr))
}
db.rOpt = C.rocksdb_readoptions_create()
db.wOpt = C.rocksdb_writeoptions_create()
return nil
}
// NewBloomFilter returns a new filter policy that uses a bloom filter with approximately
// the specified number of bits per key. A good value for bits_per_key
// is 10, which yields a filter with ~1% false positive rate.
//
// Note: if you are using a custom comparator that ignores some parts
// of the keys being compared, you must not use NewBloomFilterPolicy()
// and must provide your own FilterPolicy that also ignores the
// corresponding parts of the keys. For example, if the comparator
// ignores trailing spaces, it would be incorrect to use a
// FilterPolicy (like NewBloomFilterPolicy) that does not ignore
// trailing spaces in keys.
func NewBloomFilter(bitsPerKey int) FilterPolicy {
return NewNativeFilterPolicy(C.rocksdb_filterpolicy_create_bloom(C.int(bitsPerKey)))
}
// NewBloomFilter creates a filter policy that will create a bloom filter when
// necessary with the given number of bits per key.
//
// See the FilterPolicy documentation for more.
func NewBloomFilter(bitsPerKey int) *FilterPolicy {
policy := C.rocksdb_filterpolicy_create_bloom(C.int(bitsPerKey))
return &FilterPolicy{policy}
}
