聊聊canalgo的position

• Z时代
• 2024-01-10
• 分类：综合

Position

canal-go-v1.0.7/protocol/Position/Position.go

package position
type Position interface {
}

• Position.go定义了一个Position接口

MetaqPosition

canal-go-v1.0.7/protocol/Position/metaq_position.go

package position
type MetaqPosition struct {
	Topic    string
	MsgNewId string
	Offset   int64
}

• MetaqPosition定义了Topic、MsgNewId、Offset属性

TimePosition

canal-go-v1.0.7/protocol/Position/time_position.go

package position
type TimePosition struct {
	Timestamp int64
}
func NewTimePosition(timestamp int64) *TimePosition {
	tstamp := &TimePosition{Timestamp: timestamp}
	return tstamp
}

• TimePosition定义了Timestamp属性，NewTimePosition方法实例化TimePosition

EntryPosition

canal-go-v1.0.7/protocol/Position/entry_position.go

package position
const (
	EVENTIDENTITY_SEGMENT = 3
	EVENTIDENTITY_SPLIT   = 5
)
type EntryPosition struct {
	TimePosition
	Included    bool
	JournalName string
	Position    int64
	ServerId    int64
}
func NewEntryPosition(journalName string, position int64, timestamp int64, serverId int64, Included bool) *EntryPosition {
	entryPosition := &EntryPosition{TimePosition{timestamp}, false, journalName, position, serverId}
	return entryPosition
}

• EntryPosition定义了TimePosition、Included、JournalName、Position、ServerId属性；NewEntryPosition方法实例一个EntryPosition

LogPosition

go-projects/canal-go-v1.0.7/protocol/Position/log_position.go

package position
type LogPosition struct {
	Identity LogIdentity
	Postion  EntryPosition
}

• LogPosition定义了LogIdentity、EntryPosition属性

小结

canal-go定义了Position、MetaqPosition、TimePosition、EntryPosition、LogPosition

doc

• Position

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