func (db *DB) NewReadOptions(createSnapshot bool) *ReadOptions {
var opt = new(ReadOptions)
opt.rOpt = C.rocksdb_readoptions_create()
if createSnapshot {
opt.snap = C.rocksdb_create_snapshot(db.db)
C.rocksdb_readoptions_set_snapshot(opt.rOpt, opt.snap)
opt.db = db.db
}
return opt
}
// CreateSnapshot creates a snapshot handle from engine.
func (r *RocksDB) CreateSnapshot(snapshotID string) error {
if r.rdb == nil {
return util.Errorf("RocksDB is not initialized yet")
}
_, ok := r.snapshots[snapshotID]
if ok {
return util.Errorf("snapshotID %s already exists", snapshotID)
}
snapshotHandle := C.rocksdb_create_snapshot(r.rdb)
r.snapshots[snapshotID] = snapshotHandle
return nil
}
func (db *DB) NewSnapshot() (driver.ISnapshot, error) {
snap := &Snapshot{
db: db,
snap: C.rocksdb_create_snapshot(db.db),
readOpts: NewReadOptions(),
iteratorOpts: NewReadOptions(),
}
snap.readOpts.SetSnapshot(snap)
snap.iteratorOpts.SetSnapshot(snap)
snap.iteratorOpts.SetFillCache(false)
return snap, nil
}
// NewSnapshot creates a new snapshot of the database.
func (self *DB) NewSnapshot() *Snapshot {
cSnap := C.rocksdb_create_snapshot(self.c)
return NewNativeSnapshot(cSnap, self.c)
}
// NewSnapshot creates a new snapshot of the database.
//
// The snapshot, when used in a ReadOptions, provides a consistent view of
// state of the database at the the snapshot was created.
//
// To prevent memory leaks and resource strain in the database, the snapshot
// returned must be released with DB.ReleaseSnapshot method on the DB that
// created it.
//
// See the LevelDB documentation for details.
func (db *DB) NewSnapshot() *Snapshot {
return &Snapshot{C.rocksdb_create_snapshot(db.Ldb)}
}
// NewSnapshot creates a new snapshot of the database.
func (db *DB) NewSnapshot() *Snapshot {
cSnap := C.rocksdb_create_snapshot(db.c)
return NewNativeSnapshot(cSnap, db.c)
}