github.com/nutsdb/nutsdb@v1.0.4/rwmanager.go (about) 1 // Copyright 2019 The nutsdb Author. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package nutsdb 16 17 // RWMode represents the read and write mode. 18 type RWMode int 19 20 const ( 21 // FileIO represents the read and write mode using standard I/O. 22 FileIO RWMode = iota 23 24 // MMap represents the read and write mode using mmap. 25 MMap 26 ) 27 28 // RWManager represents an interface to a RWManager. 29 type RWManager interface { 30 WriteAt(b []byte, off int64) (n int, err error) 31 ReadAt(b []byte, off int64) (n int, err error) 32 Sync() (err error) 33 Release() (err error) 34 Size() int64 35 Close() (err error) 36 }