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
}
// SetCompression sets whether to compress blocks using the specified
// compresssion algorithm.
//
// The default value is SnappyCompression and it is fast enough that it is
// unlikely you want to turn it off. The other option is NoCompression.
//
// If the LevelDB library was built without Snappy compression enabled, the
// SnappyCompression setting will be ignored.
func (o *Options) SetCompression(t CompressionOpt) {
C.rocksdb_options_set_compression(o.Opt, C.int(t))
}
// SetCompression sets the compression algorithm.
// Default: SnappyCompression, which gives lightweight but fast
// compression.
func (opts *Options) SetCompression(value CompressionType) {
C.rocksdb_options_set_compression(opts.c, C.int(value))
}