tidb mock 源码
tidb mock 代码
文件路径：/owner/mock.go
// Copyright 2017 PingCAP, 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 owner
import (
"context"
"sync/atomic"
"github.com/pingcap/errors"
)
var _ Manager = &mockManager{}
// mockManager represents the structure which is used for electing owner.
// It's used for local store and testing.
// So this worker will always be the owner.
type mockManager struct {
owner int32
id string // id is the ID of manager.
cancel context.CancelFunc
beOwnerHook func()
}
// NewMockManager creates a new mock Manager.
func NewMockManager(ctx context.Context, id string) Manager {
_, cancelFunc := context.WithCancel(ctx)
return &mockManager{
id: id,
cancel: cancelFunc,
}
}
// ID implements Manager.ID interface.
func (m *mockManager) ID() string {
return m.id
}
// IsOwner implements Manager.IsOwner interface.
func (m *mockManager) IsOwner() bool {
return atomic.LoadInt32(&m.owner) == 1
}
func (m *mockManager) toBeOwner() {
if m.beOwnerHook != nil {
m.beOwnerHook()
}
atomic.StoreInt32(&m.owner, 1)
}
// RetireOwner implements Manager.RetireOwner interface.
func (m *mockManager) RetireOwner() {
atomic.StoreInt32(&m.owner, 0)
}
// Cancel implements Manager.Cancel interface.
func (m *mockManager) Cancel() {
m.cancel()
}
// GetOwnerID implements Manager.GetOwnerID interface.
func (m *mockManager) GetOwnerID(_ context.Context) (string, error) {
if m.IsOwner() {
return m.ID(), nil
}
return "", errors.New("no owner")
}
// CampaignOwner implements Manager.CampaignOwner interface.
func (m *mockManager) CampaignOwner() error {
m.toBeOwner()
return nil
}
// ResignOwner lets the owner start a new election.
func (m *mockManager) ResignOwner(_ context.Context) error {
if m.IsOwner() {
m.RetireOwner()
}
return nil
}
// RequireOwner implements Manager.RequireOwner interface.
func (*mockManager) RequireOwner(context.Context) error {
return nil
}
func (m *mockManager) SetBeOwnerHook(hook func()) {
m.beOwnerHook = hook
}
// CampaignCancel implements Manager.CampaignCancel interface
func (m *mockManager) CampaignCancel() {
// do nothing
}
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