/
store.go
201 lines (170 loc) · 3.88 KB
/
store.go
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// Copyright 2015 Reborndb Org. All Rights Reserved.
// Licensed under the MIT (MIT-LICENSE.txt) license.
package store
import (
"container/list"
"sync"
"github.com/juju/errors"
"github.com/ngaut/log"
"github.com/reborndb/qdb/pkg/engine"
)
var (
ErrClosed = errors.New("store has been closed")
)
type Store struct {
mu sync.Mutex
db engine.Database
splist list.List
itlist list.List
serial uint64
preCommitHandlers []ForwardHandler
postCommitHandlers []ForwardHandler
}
func New(db engine.Database) *Store {
s := &Store{db: db}
s.preCommitHandlers = make([]ForwardHandler, 0)
s.postCommitHandlers = make([]ForwardHandler, 0)
return s
}
func (s *Store) Acquire() error {
return s.acquire()
}
func (s *Store) Release() {
s.release()
}
func (s *Store) acquire() error {
s.mu.Lock()
if s.db != nil {
return nil
}
s.mu.Unlock()
return errors.Trace(ErrClosed)
}
func (s *Store) release() {
s.mu.Unlock()
}
func (s *Store) commit(bt *engine.Batch, fw *Forward) error {
if bt.Len() == 0 {
return nil
}
s.travelPreCommitHandlers(fw)
if err := s.db.Commit(bt); err != nil {
log.Warningf("store commit failed - %s", err)
return err
}
for i := s.itlist.Len(); i != 0; i-- {
v := s.itlist.Remove(s.itlist.Front()).(*storeIterator)
v.Close()
}
s.serial++
s.travelPostCommitHandlers(fw)
return nil
}
func (s *Store) getRowValue(key []byte) ([]byte, error) {
return s.db.Get(key)
}
func (s *Store) getIterator() (it *storeIterator) {
if e := s.itlist.Front(); e != nil {
return s.itlist.Remove(e).(*storeIterator)
}
return &storeIterator{
Iterator: s.db.NewIterator(),
serial: s.serial,
}
}
func (s *Store) putIterator(it *storeIterator) {
if it.serial == s.serial && it.Error() == nil {
s.itlist.PushFront(it)
} else {
it.Close()
}
}
func (s *Store) Close() {
if err := s.acquire(); err != nil {
return
}
defer s.release()
log.Infof("store is closing ...")
for i := s.splist.Len(); i != 0; i-- {
v := s.splist.Remove(s.splist.Front()).(*StoreSnapshot)
v.Close()
}
for i := s.itlist.Len(); i != 0; i-- {
v := s.itlist.Remove(s.itlist.Front()).(*storeIterator)
v.Close()
}
if s.db != nil {
s.db.Close()
s.db = nil
}
log.Infof("store is closed")
}
func (s *Store) NewSnapshot() (*StoreSnapshot, error) {
return s.NewSnapshotFunc(nil)
}
// New a snapshot and then call f if not nil
func (s *Store) NewSnapshotFunc(f func()) (*StoreSnapshot, error) {
if err := s.acquire(); err != nil {
return nil, err
}
defer s.release()
sp := &StoreSnapshot{sp: s.db.NewSnapshot()}
s.splist.PushBack(sp)
log.Infof("store create new snapshot, address = %p", sp)
if f != nil {
f()
}
return sp, nil
}
func (s *Store) ReleaseSnapshot(sp *StoreSnapshot) {
if err := s.acquire(); err != nil {
return
}
defer s.release()
log.Infof("store release snapshot, address = %p", sp)
for i := s.splist.Len(); i != 0; i-- {
v := s.splist.Remove(s.splist.Front()).(*StoreSnapshot)
if v != sp {
s.splist.PushBack(v)
}
}
sp.Close()
}
func (s *Store) Reset() error {
if err := s.acquire(); err != nil {
return err
}
defer s.release()
log.Infof("store is reseting...")
for i := s.splist.Len(); i != 0; i-- {
v := s.splist.Remove(s.splist.Front()).(*StoreSnapshot)
v.Close()
}
for i := s.itlist.Len(); i != 0; i-- {
v := s.itlist.Remove(s.itlist.Front()).(*storeIterator)
v.Close()
}
if err := s.db.Clear(); err != nil {
s.db.Close()
s.db = nil
log.Errorf("store reset failed - %s", err)
return err
} else {
s.serial++
log.Infof("store is reset")
return nil
}
}
func (s *Store) compact(start, limit []byte) error {
if err := s.db.Compact(start, limit); err != nil {
log.Errorf("store compact failed - %s", err)
return err
} else {
return nil
}
}
func errArguments(format string, v ...interface{}) error {
err := errors.Errorf(format, v...)
log.Warningf("call store function with invalid arguments - %s", err)
return err
}