io.debezium.connector.sqlserver

类 SqlServerStreamingChangeEventSource

java.lang.Object

io.debezium.connector.sqlserver.SqlServerStreamingChangeEventSource

所有已实现的接口:

io.debezium.pipeline.source.spi.ChangeEventSource, io.debezium.pipeline.source.spi.StreamingChangeEventSource<io.debezium.connector.sqlserver.SqlServerOffsetContext>

直接已知子类:

SqlServerTransactionLogFetchTask.TransactionLogSplitReadTask

public class SqlServerStreamingChangeEventSource
extends Object
implements io.debezium.pipeline.source.spi.StreamingChangeEventSource<io.debezium.connector.sqlserver.SqlServerOffsetContext>

A StreamingChangeEventSource based on SQL Server change data capture functionality. A main loop polls database DDL change and change data tables and turns them into change events.

The connector uses CDC functionality of SQL Server that is implemented as as a process that monitors source table and write changes from the table into the change table.

The main loop keeps a pointer to the LSN of changes that were already processed. It queries all change tables and get result set of changes. It always finds the smallest LSN across all tables and the change is converted into the event message and sent downstream. The process repeats until all result sets are empty. The LSN is marked and the procedure repeats.

The schema changes detection follows the procedure recommended by SQL Server CDC documentation. The database operator should create one more capture process (and table) when a table schema is updated. The code detects presence of two change tables for a single source table. It decides which table is the new one depending on LSNs stored in them. The loop streams changes from the older table till there are events in new table with the LSN larger than in the old one. Then the change table is switched and streaming is executed from the new one.

嵌套类概要

从接口继承的嵌套类/接口 io.debezium.pipeline.source.spi.ChangeEventSource

io.debezium.pipeline.source.spi.ChangeEventSource.ChangeEventSourceContext

构造器概要

构造器

构造器和说明

SqlServerStreamingChangeEventSource(io.debezium.connector.sqlserver.SqlServerConnectorConfig connectorConfig, io.debezium.connector.sqlserver.SqlServerConnection dataConnection, io.debezium.connector.sqlserver.SqlServerConnection metadataConnection, io.debezium.pipeline.EventDispatcher<TableId> dispatcher, io.debezium.pipeline.ErrorHandler errorHandler, io.debezium.util.Clock clock, io.debezium.connector.sqlserver.SqlServerDatabaseSchema schema)

方法概要

限定符和类型	方法和说明
protected void	afterHandleLsn(io.debezium.connector.sqlserver.SqlServerOffsetContext offsetContext) expose control to the user to stop the connector.
void	execute(io.debezium.pipeline.source.spi.ChangeEventSource.ChangeEventSourceContext context, io.debezium.connector.sqlserver.SqlServerOffsetContext offsetContext)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 io.debezium.pipeline.source.spi.StreamingChangeEventSource

commitOffset, init

构造器详细资料

SqlServerStreamingChangeEventSource

public SqlServerStreamingChangeEventSource(io.debezium.connector.sqlserver.SqlServerConnectorConfig connectorConfig,
                                           io.debezium.connector.sqlserver.SqlServerConnection dataConnection,
                                           io.debezium.connector.sqlserver.SqlServerConnection metadataConnection,
                                           io.debezium.pipeline.EventDispatcher<TableId> dispatcher,
                                           io.debezium.pipeline.ErrorHandler errorHandler,
                                           io.debezium.util.Clock clock,
                                           io.debezium.connector.sqlserver.SqlServerDatabaseSchema schema)

方法详细资料

execute

public void execute(io.debezium.pipeline.source.spi.ChangeEventSource.ChangeEventSourceContext context,
                    io.debezium.connector.sqlserver.SqlServerOffsetContext offsetContext)
             throws InterruptedException

指定者:

execute 在接口中 io.debezium.pipeline.source.spi.StreamingChangeEventSource<io.debezium.connector.sqlserver.SqlServerOffsetContext>

抛出:

InterruptedException

afterHandleLsn

protected void afterHandleLsn(io.debezium.connector.sqlserver.SqlServerOffsetContext offsetContext)

expose control to the user to stop the connector.