128 lines
2 KiB
Go
128 lines
2 KiB
Go
package nodb
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import (
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"fmt"
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"sync"
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"time"
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"github.com/lunny/log"
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"github.com/lunny/nodb/config"
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"github.com/lunny/nodb/store"
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)
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type Nodb struct {
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cfg *config.Config
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ldb *store.DB
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dbs [MaxDBNumber]*DB
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quit chan struct{}
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jobs *sync.WaitGroup
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binlog *BinLog
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wLock sync.RWMutex //allow one write at same time
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commitLock sync.Mutex //allow one write commit at same time
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}
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func Open(cfg *config.Config) (*Nodb, error) {
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if len(cfg.DataDir) == 0 {
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cfg.DataDir = config.DefaultDataDir
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}
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ldb, err := store.Open(cfg)
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if err != nil {
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return nil, err
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}
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l := new(Nodb)
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l.quit = make(chan struct{})
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l.jobs = new(sync.WaitGroup)
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l.ldb = ldb
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if cfg.BinLog.MaxFileNum > 0 && cfg.BinLog.MaxFileSize > 0 {
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l.binlog, err = NewBinLog(cfg)
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if err != nil {
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return nil, err
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}
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} else {
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l.binlog = nil
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}
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for i := uint8(0); i < MaxDBNumber; i++ {
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l.dbs[i] = l.newDB(i)
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}
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l.activeExpireCycle()
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return l, nil
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}
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func (l *Nodb) Close() {
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close(l.quit)
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l.jobs.Wait()
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l.ldb.Close()
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if l.binlog != nil {
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l.binlog.Close()
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l.binlog = nil
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}
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}
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func (l *Nodb) Select(index int) (*DB, error) {
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if index < 0 || index >= int(MaxDBNumber) {
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return nil, fmt.Errorf("invalid db index %d", index)
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}
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return l.dbs[index], nil
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}
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func (l *Nodb) FlushAll() error {
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for index, db := range l.dbs {
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if _, err := db.FlushAll(); err != nil {
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log.Error("flush db %d error %s", index, err.Error())
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}
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}
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return nil
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}
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// very dangerous to use
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func (l *Nodb) DataDB() *store.DB {
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return l.ldb
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}
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func (l *Nodb) activeExpireCycle() {
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var executors []*elimination = make([]*elimination, len(l.dbs))
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for i, db := range l.dbs {
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executors[i] = db.newEliminator()
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}
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l.jobs.Add(1)
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go func() {
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tick := time.NewTicker(1 * time.Second)
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end := false
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done := make(chan struct{})
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for !end {
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select {
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case <-tick.C:
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go func() {
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for _, eli := range executors {
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eli.active()
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}
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done <- struct{}{}
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}()
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<-done
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case <-l.quit:
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end = true
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break
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}
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}
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tick.Stop()
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l.jobs.Done()
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}()
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}
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