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backend.go
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backend.go
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// Copyright 2020 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 unified
import "github.com/tikv/migration/cdc/cdc/model"
type backEnd interface {
reader() (backEndReader, error)
writer() (backEndWriter, error)
free() error
}
type backEndReader interface {
readNext() (*model.PolymorphicEvent, error)
resetAndClose() error
}
type backEndWriter interface {
writeNext(event *model.PolymorphicEvent) error
writtenCount() int
dataSize() uint64
flushAndClose() error
}