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mutation.go
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mutation.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 (
"fmt"
"sync"
"github.com/couchbase/indexing/secondary/common"
)
//MutationMeta represents meta information for a KV Mutation
type MutationMeta struct {
bucket string //bucket for the mutation
vbucket Vbucket //vbucket
vbuuid Vbuuid //uuid for vbucket
seqno Seqno //vbucket sequence number for this mutation
}
var mutMetaPool = sync.Pool{New: newMutationMeta}
var useMutationSyncPool bool = false
func NewMutationMeta() *MutationMeta {
if useMutationSyncPool {
return mutMetaPool.Get().(*MutationMeta)
}
return &MutationMeta{}
}
func newMutationMeta() interface{} {
return &MutationMeta{}
}
func (m *MutationMeta) SetVBId(vbid int) {
m.vbucket = Vbucket(vbid)
}
func (m *MutationMeta) Clone() *MutationMeta {
meta := NewMutationMeta()
meta.bucket = m.bucket
meta.vbucket = m.vbucket
meta.vbuuid = m.vbuuid
meta.seqno = m.seqno
return meta
}
func (m *MutationMeta) Size() int64 {
size := int64(len(m.bucket))
size += 8 + 4 + 8 + 8 //fixed cost of members
return size
}
func (m *MutationMeta) Free() {
if useMutationSyncPool {
mutMetaPool.Put(m)
}
}
func (m MutationMeta) String() string {
str := fmt.Sprintf("Bucket: %v ", m.bucket)
str += fmt.Sprintf("Vbucket: %v ", m.vbucket)
str += fmt.Sprintf("Vbuuid: %v ", m.vbuuid)
str += fmt.Sprintf("Seqno: %v ", m.seqno)
return str
}
//MutationKeys holds the Secondary Keys from a single KV Mutation
type MutationKeys struct {
meta *MutationMeta
docid []byte // primary document id
mut []*Mutation //list of mutations for each index-id
}
var mutkeysPool = sync.Pool{New: newMutationKeys}
func NewMutationKeys() *MutationKeys {
if useMutationSyncPool {
return mutkeysPool.Get().(*MutationKeys)
}
return &MutationKeys{}
}
func newMutationKeys() interface{} {
return &MutationKeys{}
}
func (mk *MutationKeys) Size() int64 {
var size int64
size = mk.meta.Size()
size += int64(len(mk.docid))
for _, m := range mk.mut {
size += m.Size()
}
size += 8 + 16 + 16 //fixed cost of members
return size
}
func (mk *MutationKeys) Free() {
if useMutationSyncPool {
mk.meta.Free()
mk.docid = mk.docid[:0]
for _, m := range mk.mut {
m.Free()
}
mk.mut = mk.mut[:0]
mutkeysPool.Put(mk)
}
}
type Mutation struct {
uuid common.IndexInstId // index-id
command byte // command the index
key []byte // key-version for index
oldkey []byte // previous key-version, if available
partnkey []byte // partition key
}
var mutPool = sync.Pool{New: newMutation}
func NewMutation() *Mutation {
if useMutationSyncPool {
return mutPool.Get().(*Mutation)
}
return &Mutation{}
}
func newMutation() interface{} {
return &Mutation{}
}
func (m *Mutation) Size() int64 {
var size int64
size = int64(len(m.key))
size += int64(len(m.partnkey))
size += 8 + 1 //instId + command
size += 16 + 16 + 16 //fixed cost of members
return size
}
func (m *Mutation) Free() {
if useMutationSyncPool {
m.key = m.key[:0]
m.oldkey = m.oldkey[:0]
m.partnkey = m.partnkey[:0]
mutPool.Put(m)
}
}