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metastore_manager.go
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metastore_manager.go
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// Copyright 2022 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package servermaster
import (
"sync"
"github.com/pingcap/log"
metaModel "github.com/pingcap/tiflow/engine/pkg/meta/model"
"github.com/pingcap/tiflow/pkg/errors"
"go.uber.org/zap"
)
// MetaStoreManager defines an interface to manage metastore
type MetaStoreManager interface {
// Register register specify backend store to manager with an unique id
// id can be some readable identifier, like `meta-test1`.
// Duplicate id will return an error
Register(id string, store *metaModel.StoreConfig) error
// UnRegister delete an existing backend store
UnRegister(id string)
// GetMetaStore get an existing backend store info
GetMetaStore(id string) *metaModel.StoreConfig
}
type metaStoreManagerImpl struct {
// From id to metaModel.StoreConfig
id2Store sync.Map
}
// NewMetaStoreManager creates a new metaStoreManagerImpl instance
func NewMetaStoreManager() MetaStoreManager {
return &metaStoreManagerImpl{}
}
// Register implements MetaStoreManager.Register
func (m *metaStoreManagerImpl) Register(id string, store *metaModel.StoreConfig) error {
if _, exists := m.id2Store.LoadOrStore(id, store); exists {
log.Error("register metastore fail", zap.Any("config", store), zap.String("err", "Duplicate storeID"))
return errors.ErrMetaStoreIDDuplicate.GenWithStackByArgs()
}
return nil
}
// Unregister implements MetaStoreManager.Unregister
func (m *metaStoreManagerImpl) UnRegister(id string) {
m.id2Store.Delete(id)
log.Info("unregister metastore", zap.String("storeID", id))
}
// GetMetaStore implements MetaStoreManager.GetMetaStore
func (m *metaStoreManagerImpl) GetMetaStore(id string) *metaModel.StoreConfig {
if store, exists := m.id2Store.Load(id); exists {
return store.(*metaModel.StoreConfig)
}
return nil
}