mirror of https://github.com/tikv/client-go.git
81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
// Copyright 2021 TiKV Authors
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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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// See the License for the specific language governing permissions and
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// limitations under the License.
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// NOTE: The code in this file is based on code from the
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// TiDB project, licensed under the Apache License v 2.0
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//
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// https://github.com/pingcap/tidb/tree/cc5e161ac06827589c4966674597c137cc9e809c/store/tikv/kv/kv.go
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//
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package kv
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import (
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"sync"
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"time"
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tikverr "github.com/tikv/client-go/v2/error"
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"github.com/tikv/client-go/v2/util"
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)
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// ReturnedValue pairs the Value and AlreadyLocked flag for PessimisticLock return values result.
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type ReturnedValue struct {
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Value []byte
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AlreadyLocked bool
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}
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// LockCtx contains information for LockKeys method.
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type LockCtx struct {
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Killed *uint32
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ForUpdateTS uint64
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LockWaitTime int64
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WaitStartTime time.Time
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PessimisticLockWaited *int32
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LockKeysDuration *int64
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LockKeysCount *int32
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ReturnValues bool
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Values map[string]ReturnedValue
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ValuesLock sync.Mutex
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LockExpired *uint32
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Stats *util.LockKeysDetails
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ResourceGroupTag []byte
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OnDeadlock func(*tikverr.ErrDeadlock)
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}
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// InitReturnValues creates the map to store returned value.
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func (ctx *LockCtx) InitReturnValues(valueLen int) {
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ctx.ReturnValues = true
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ctx.Values = make(map[string]ReturnedValue, valueLen)
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}
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// GetValueNotLocked returns a value if the key is not already locked.
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// (nil, false) means already locked.
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func (ctx *LockCtx) GetValueNotLocked(key []byte) ([]byte, bool) {
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rv := ctx.Values[string(key)]
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if !rv.AlreadyLocked {
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return rv.Value, true
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}
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return nil, false
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}
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// IterateValuesNotLocked applies f to all key-values that are not already
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// locked.
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func (ctx *LockCtx) IterateValuesNotLocked(f func([]byte, []byte)) {
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ctx.ValuesLock.Lock()
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defer ctx.ValuesLock.Unlock()
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for key, val := range ctx.Values {
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if !val.AlreadyLocked {
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f([]byte(key), val.Value)
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}
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}
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}
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