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rdbcontext.go
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rdbcontext.go
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// Copyright 2017-2019 Lei Ni (nilei81@gmail.com) and other Dragonboat authors.
//
// 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 logdb
import (
"github.com/lni/dragonboat/v3/internal/logdb/kv"
"github.com/lni/dragonboat/v3/raftio"
pb "github.com/lni/dragonboat/v3/raftpb"
)
const (
updateSliceLen = 256
)
// rdbcontext is an IContext implementation suppose to be owned and used
// by a single thread throughout its life time.
type rdbcontext struct {
valSize uint64
eb pb.EntryBatch
lb pb.EntryBatch
key *PooledKey
val []byte
updates []pb.Update
wb kv.IWriteBatch
}
// newRDBContext creates a new RDB context instance.
func newRDBContext(valSize uint64, wb kv.IWriteBatch) *rdbcontext {
ctx := &rdbcontext{
valSize: valSize,
key: newKey(maxKeySize, nil),
val: make([]byte, valSize),
updates: make([]pb.Update, 0, updateSliceLen),
wb: wb,
}
ctx.lb.Entries = make([]pb.Entry, 0, batchSize)
ctx.eb.Entries = make([]pb.Entry, 0, batchSize)
return ctx
}
func (c *rdbcontext) Destroy() {
if c.wb != nil {
c.wb.Destroy()
}
}
func (c *rdbcontext) Reset() {
if c.wb != nil {
c.wb.Clear()
}
}
func (c *rdbcontext) GetKey() raftio.IReusableKey {
return c.key
}
func (c *rdbcontext) GetValueBuffer(sz uint64) []byte {
if sz <= c.valSize {
return c.val
}
return make([]byte, sz)
}
func (c *rdbcontext) GetUpdates() []pb.Update {
return c.updates
}
func (c *rdbcontext) GetEntryBatch() pb.EntryBatch {
return c.eb
}
func (c *rdbcontext) GetLastEntryBatch() pb.EntryBatch {
return c.lb
}
func (c *rdbcontext) GetWriteBatch() interface{} {
return c.wb
}