github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/cdc/sink/dmlsink/mq/dispatcher/topic/dispatcher.go (about)

     1  // Copyright 2022 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 topic
    15  
    16  import (
    17  	"fmt"
    18  )
    19  
    20  // Dispatcher is an abstraction for dispatching rows and ddls into different topics.
    21  type Dispatcher interface {
    22  	fmt.Stringer
    23  	Substitute(schema, table string) string
    24  }
    25  
    26  // StaticTopicDispatcher is a topic dispatcher which dispatches rows and DDL to the specific topic.
    27  type StaticTopicDispatcher struct {
    28  	topic string
    29  }
    30  
    31  // NewStaticTopicDispatcher returns a StaticTopicDispatcher.
    32  func NewStaticTopicDispatcher(defaultTopic string) *StaticTopicDispatcher {
    33  	return &StaticTopicDispatcher{
    34  		topic: defaultTopic,
    35  	}
    36  }
    37  
    38  // Substitute converts schema/table name in a topic expression to kafka topic name.
    39  func (s *StaticTopicDispatcher) Substitute(schema, table string) string {
    40  	return s.topic
    41  }
    42  
    43  func (s *StaticTopicDispatcher) String() string {
    44  	return s.topic
    45  }
    46  
    47  // DynamicTopicDispatcher is a topic dispatcher which dispatches rows and DDLs
    48  // dynamically to the target topics.
    49  type DynamicTopicDispatcher struct {
    50  	expression Expression
    51  }
    52  
    53  // NewDynamicTopicDispatcher creates a DynamicTopicDispatcher.
    54  func NewDynamicTopicDispatcher(topicExpr Expression) *DynamicTopicDispatcher {
    55  	return &DynamicTopicDispatcher{
    56  		expression: topicExpr,
    57  	}
    58  }
    59  
    60  // Substitute converts schema/table name in a topic expression to kafka topic name.
    61  func (d *DynamicTopicDispatcher) Substitute(schema, table string) string {
    62  	return d.expression.Substitute(schema, table)
    63  }
    64  
    65  func (d *DynamicTopicDispatcher) String() string {
    66  	return string(d.expression)
    67  }