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callback.go
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callback.go
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// Copyright 2015 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 ddl
import (
"github.com/pingcap/tidb/model"
goctx "golang.org/x/net/context"
)
// Callback is the interface supporting callback function when DDL changed.
type Callback interface {
// OnChanged is called after schema is changed.
OnChanged(err error) error
// OnJobRunBefore is called before running job.
OnJobRunBefore(job *model.Job)
// OnJobUpdated is called after the running job is updated.
OnJobUpdated(job *model.Job)
// OnWatched is called after watching owner is completed.
OnWatched(ctx goctx.Context)
}
// BaseCallback implements Callback.OnChanged interface.
type BaseCallback struct {
}
// OnChanged implements Callback interface.
func (c *BaseCallback) OnChanged(err error) error {
return err
}
// OnJobRunBefore implements Callback.OnJobRunBefore interface.
func (c *BaseCallback) OnJobRunBefore(job *model.Job) {
// Nothing to do.
}
// OnJobUpdated implements Callback.OnJobUpdated interface.
func (c *BaseCallback) OnJobUpdated(job *model.Job) {
// Nothing to do.
}
// OnWatched implements Callback.OnWatched interface.
func (c *BaseCallback) OnWatched(ctx goctx.Context) {
// Nothing to do.
}