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
}
// SetWriteBufferSize sets the number of bytes the database will build up in
// memory (backed by an unsorted log on disk) before converting to a sorted
// on-disk file.
func (o *Options) SetWriteBufferSize(s int) {
C.rocksdb_options_set_write_buffer_size(o.Opt, C.size_t(s))
}
// SetWriteBufferSize sets the amount of data to build up in memory
// (backed by an unsorted log on disk) before converting to a sorted on-disk file.
//
// Larger values increase performance, especially during bulk loads.
// Up to max_write_buffer_number write buffers may be held in memory
// at the same time,
// so you may wish to adjust this parameter to control memory usage.
// Also, a larger write buffer will result in a longer recovery time
// the next time the database is opened.
// Default: 4MB
func (opts *Options) SetWriteBufferSize(value int) {
C.rocksdb_options_set_write_buffer_size(opts.c, C.size_t(value))
}
