76 lines
2.4 KiB
Go
76 lines
2.4 KiB
Go
// Copyright 2023 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"context"
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"sync"
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"github.com/pingcap/tidb/pkg/infoschema"
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"github.com/pingcap/tidb/pkg/table"
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"github.com/pingcap/tidb/pkg/util/intest"
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)
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// TableInfoGetter is used to get table meta info.
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type TableInfoGetter interface {
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// TableInfoByID returns the table info specified by the physicalID.
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// If the physicalID is corresponding to a partition, return its parent table.
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TableInfoByID(is infoschema.InfoSchema, physicalID int64) (table.Table, bool)
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}
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// tableInfoGetterImpl is used to get table meta info.
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type tableInfoGetterImpl struct {
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// pid2tid is the map from partition ID to table ID.
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pid2tid map[int64]int64
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// schemaVersion is the version of information schema when `pid2tid` is built.
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schemaVersion int64
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mu sync.RWMutex
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}
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// NewTableInfoGetter creates a TableInfoGetter.
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func NewTableInfoGetter() TableInfoGetter {
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return &tableInfoGetterImpl{pid2tid: map[int64]int64{}}
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}
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// TableInfoByID returns the table info specified by the physicalID.
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// If the physicalID is corresponding to a partition, return its parent table.
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func (c *tableInfoGetterImpl) TableInfoByID(is infoschema.InfoSchema, physicalID int64) (table.Table, bool) {
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c.mu.Lock()
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defer c.mu.Unlock()
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if is.SchemaMetaVersion() != c.schemaVersion {
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c.schemaVersion = is.SchemaMetaVersion()
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c.pid2tid = buildPartitionID2TableID(is)
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}
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if id, ok := c.pid2tid[physicalID]; ok {
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return is.TableByID(context.Background(), id)
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}
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return is.TableByID(context.Background(), physicalID)
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}
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func buildPartitionID2TableID(is infoschema.InfoSchema) map[int64]int64 {
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mapper := make(map[int64]int64)
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rs := is.ListTablesWithSpecialAttribute(infoschema.PartitionAttribute)
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for _, db := range rs {
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for _, tbl := range db.TableInfos {
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pi := tbl.GetPartitionInfo()
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intest.AssertNotNil(pi)
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for _, def := range pi.Definitions {
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mapper[def.ID] = tbl.ID
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}
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}
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}
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return mapper
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}
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