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unit_state.go
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unit_state.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 metadata
import (
"context"
"encoding/json"
"sync"
"time"
"github.com/pingcap/tiflow/dm/pb"
frameModel "github.com/pingcap/tiflow/engine/framework/model"
"github.com/pingcap/tiflow/engine/pkg/adapter"
metaModel "github.com/pingcap/tiflow/engine/pkg/meta/model"
"github.com/pingcap/tiflow/pkg/errors"
)
// UnitState represents the state of units.
type UnitState struct {
// taskID -> sequence of finished status
FinishedUnitStatus map[string][]*FinishedTaskStatus
CurrentUnitStatus map[string]*UnitStatus
}
// UnitStateStore is the meta store for UnitState.
type UnitStateStore struct {
// rmwLock is used to prevent concurrent read-modify-write to the state.
rmwLock sync.Mutex
*frameworkMetaStore
}
func (f *UnitStateStore) createState() state {
return &UnitState{
FinishedUnitStatus: map[string][]*FinishedTaskStatus{},
CurrentUnitStatus: map[string]*UnitStatus{},
}
}
func (f *UnitStateStore) key() string {
return adapter.DMUnitStateAdapter.Encode()
}
// ReadModifyWrite reads the state, modifies it, and writes it back.
func (f *UnitStateStore) ReadModifyWrite(
ctx context.Context,
action func(*UnitState) error,
) error {
f.rmwLock.Lock()
defer f.rmwLock.Unlock()
s, err := f.Get(ctx)
if err != nil {
if errors.Cause(err) == ErrStateNotFound {
s = f.createState()
} else {
return err
}
}
err = action(s.(*UnitState))
if err != nil {
return err
}
return f.Put(ctx, s)
}
// NewUnitStateStore creates a new UnitStateStore.
func NewUnitStateStore(kvClient metaModel.KVClient) *UnitStateStore {
ret := &UnitStateStore{
frameworkMetaStore: newJSONFrameworkMetaStore(kvClient),
}
ret.frameworkMetaStore.stateFactory = ret
return ret
}
// TaskStatus defines the running task status.
type TaskStatus struct {
Unit frameModel.WorkerType
Task string
Stage TaskStage
CfgModRevision uint64
StageUpdatedTime time.Time
}
// FinishedTaskStatus wraps the TaskStatus with FinishedStatus.
// It only used when a task is finished.
type FinishedTaskStatus struct {
TaskStatus
Result *pb.ProcessResult
Status json.RawMessage
Duration time.Duration
}
// UnitStatus defines the unit status.
type UnitStatus struct {
Unit frameModel.WorkerType
Task string
CreatedTime time.Time
}