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snapshot_container.go
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/
snapshot_container.go
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// Copyright (c) 2014 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions
// and limitations under the License.
package indexer
import (
"container/list"
"github.com/couchbase/indexing/secondary/common"
"github.com/couchbase/indexing/secondary/logging"
)
// A helper data stucture for in-memory snapshot info list
type SnapshotInfoContainer interface {
List() []SnapshotInfo
Add(SnapshotInfo)
Len() int
GetLatest() SnapshotInfo
GetOldest() SnapshotInfo
GetEqualToTS(*common.TsVbuuid) SnapshotInfo
GetOlderThanTS(*common.TsVbuuid) SnapshotInfo
RemoveOldest() error
RemoveRecentThanTS(*common.TsVbuuid) error
RemoveAll() error
}
type snapshotInfoContainer struct {
snapshotList *list.List
}
func NewSnapshotInfoContainer(infos []SnapshotInfo) *snapshotInfoContainer {
sc := &snapshotInfoContainer{snapshotList: list.New()}
for _, info := range infos {
sc.snapshotList.PushBack(info)
}
return sc
}
func (sc *snapshotInfoContainer) List() []SnapshotInfo {
var infos []SnapshotInfo
for e := sc.snapshotList.Front(); e != nil; e = e.Next() {
info := e.Value.(SnapshotInfo)
infos = append(infos, info)
}
return infos
}
//Add adds snapshot to container
func (sc *snapshotInfoContainer) Add(s SnapshotInfo) {
sc.snapshotList.PushFront(s)
}
//RemoveOldest removes the oldest snapshot from container.
//Return any error that happened.
func (sc *snapshotInfoContainer) RemoveOldest() error {
e := sc.snapshotList.Back()
if e != nil {
sc.snapshotList.Remove(e)
}
return nil
}
//RemoveRecentThanTS discards all the snapshots from container
//which are more recent than the given timestamp. The snaphots
//being removed are closed as well.
func (sc *snapshotInfoContainer) RemoveRecentThanTS(tsVbuuid *common.TsVbuuid) error {
newList := list.New()
ts := getSeqTsFromTsVbuuid(tsVbuuid)
for e := sc.snapshotList.Front(); e != nil; e = e.Next() {
snapshot := e.Value.(SnapshotInfo)
snapTsVbuuid := snapshot.Timestamp()
snapTs := getSeqTsFromTsVbuuid(snapTsVbuuid)
if !snapTs.GreaterThan(ts) {
newList.PushBack(snapshot)
}
}
sc.snapshotList = newList
return nil
}
//RemoveAll discards all the snapshosts from container.
//All snapshots will be closed before being discarded.
//Return any error that happened.
func (sc *snapshotInfoContainer) RemoveAll() error {
//clear the snapshot list
sc.snapshotList.Init()
return nil
}
//Len returns the number of snapshots currently in container
func (sc *snapshotInfoContainer) Len() int {
return sc.snapshotList.Len()
}
//GetLatest returns the latest snapshot from container or nil
//in case list is empty
func (sc *snapshotInfoContainer) GetLatest() SnapshotInfo {
e := sc.snapshotList.Front()
if e == nil {
return nil
} else {
return e.Value.(SnapshotInfo)
}
}
//GetOldest returns the oldest snapshot from container or nil
//in case list is empty
func (sc *snapshotInfoContainer) GetOldest() SnapshotInfo {
e := sc.snapshotList.Back()
if e == nil {
return nil
} else {
return e.Value.(SnapshotInfo)
}
}
//GetEqualToTS returns the snapshot from container matching the
//given timestamp or nil if its not able to find any match
func (sc *snapshotInfoContainer) GetEqualToTS(tsVbuuid *common.TsVbuuid) SnapshotInfo {
ts := getSeqTsFromTsVbuuid(tsVbuuid)
for e := sc.snapshotList.Front(); e != nil; e = e.Next() {
snapshot := e.Value.(SnapshotInfo)
snapTsVbuuid := snapshot.Timestamp()
snapTs := getSeqTsFromTsVbuuid(snapTsVbuuid)
if ts.Equals(snapTs) {
return snapshot
}
}
return nil
}
//GetOlderThanTS returns a snapshot which is older than the
//given TS or atleast equal. Returns nil if its not able to find any match
func (sc *snapshotInfoContainer) GetOlderThanTS(tsVbuuid *common.TsVbuuid) SnapshotInfo {
ts := getSeqTsFromTsVbuuid(tsVbuuid)
logging.Infof("SnapshotContainer::GetOlderThanTS Snapshot List: %v", sc.List())
for e := sc.snapshotList.Front(); e != nil; e = e.Next() {
snapshot := e.Value.(SnapshotInfo)
snapTsVbuuid := snapshot.Timestamp()
snapTs := getSeqTsFromTsVbuuid(snapTsVbuuid)
logging.Infof("SnapshotContainer::GetOlderThanTS Comparing with snapshot %v, snapTs = %v", snapshot, snapTs)
if ts.GreaterThanEqual(snapTs) {
return snapshot
}
}
logging.Infof("SnapshotContainer::GetOlderThanTS Returning nil as no matching snapshot found")
return nil
}