github.com/pingcap/ticdc@v0.0.0-20220526033649-485a10ef2652/cdc/puller/sorter/backend.go (about)

     1  // Copyright 2020 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package sorter
    15  
    16  import "github.com/pingcap/ticdc/cdc/model"
    17  
    18  type backEnd interface {
    19  	reader() (backEndReader, error)
    20  	writer() (backEndWriter, error)
    21  	free() error
    22  }
    23  
    24  type backEndReader interface {
    25  	readNext() (*model.PolymorphicEvent, error)
    26  	resetAndClose() error
    27  }
    28  
    29  type backEndWriter interface {
    30  	writeNext(event *model.PolymorphicEvent) error
    31  	writtenCount() int
    32  	dataSize() uint64
    33  	flushAndClose() error
    34  }
    35  
    36  type serializerDeserializer interface {
    37  	marshal(event *model.PolymorphicEvent, bytes []byte) ([]byte, error)
    38  	unmarshal(event *model.PolymorphicEvent, bytes []byte) ([]byte, error)
    39  }