forked from lni/dragonboat
/
noop.go
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/
noop.go
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// Copyright 2017-2019 Lei Ni (nilei81@gmail.com)
//
// 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 tests
import (
"encoding/json"
"io"
"io/ioutil"
"github.com/lni/dragonboat/statemachine"
)
// NoOP is a IStateMachine struct used for testing purpose.
type NoOP struct {
}
// Lookup locally looks up the data.
func (n *NoOP) Lookup(key []byte) []byte {
return make([]byte, 1)
}
// Update updates the object.
func (n *NoOP) Update(data []byte) uint64 {
return uint64(len(data))
}
// SaveSnapshot saves the state of the object to the provided io.Writer object.
func (n *NoOP) SaveSnapshot(w io.Writer,
fileCollection statemachine.ISnapshotFileCollection,
done <-chan struct{}) (uint64, error) {
data, err := json.Marshal(n)
if err != nil {
panic(err)
}
_, err = w.Write(data)
if err != nil {
return 0, err
}
return uint64(len(data)), nil
}
// RecoverFromSnapshot recovers the object from the snapshot specified by the
// io.Reader object.
func (n *NoOP) RecoverFromSnapshot(r io.Reader,
files []statemachine.SnapshotFile,
done <-chan struct{}) error {
var sn NoOP
data, err := ioutil.ReadAll(r)
if err != nil {
return err
}
err = json.Unmarshal(data, &sn)
if err != nil {
panic("failed to unmarshal snapshot")
}
return nil
}
// Close closes the NoOP IStateMachine.
func (n *NoOP) Close() {}
// GetHash returns a uint64 value representing the current state of the object.
func (n *NoOP) GetHash() uint64 {
// the hash value is always 0, so it is of course always consistent
return 0
}