Package io.debezium.connector.oracle.logminer.logwriter

Class CommitLogWriterFlushStrategy

java.lang.Object

io.debezium.connector.oracle.logminer.logwriter.CommitLogWriterFlushStrategy

All Implemented Interfaces:

LogWriterFlushStrategy, AutoCloseable

public class CommitLogWriterFlushStrategy
extends Object
implements LogWriterFlushStrategy

A LogWriterFlushStrategy that uses a transaction commit to force the provided connection's Oracle LogWriter (LGWR) process to flush to disk.

Author:

Chris Cranford

Field Summary

Fields

Modifier and Type	Field	Description
private final boolean	closeConnectionOnClose
private final OracleConnection	connection
private static final String	CREATE_FLUSH_TABLE
private static final String	DELETE_FLUSH_TABLE
private static final String	INSERT_FLUSH_TABLE
private static final org.slf4j.Logger	LOGGER
private static final String	UPDATE_FLUSH_TABLE

Fields inherited from interface io.debezium.connector.oracle.logminer.logwriter.LogWriterFlushStrategy

LOGMNR_FLUSH_TABLE

Constructor Summary

Constructors

Constructor	Description
CommitLogWriterFlushStrategy(OracleConnection connection)	Creates a transaction-commit Oracle LogWriter (LGWR) process flush strategy.
CommitLogWriterFlushStrategy(JdbcConfiguration jdbcConfig)	Creates a transaction-commit Oracle LogWriter (LGWR) process flush strategy.

Method Summary

Modifier and Type	Method	Description
void	close()
private void	createFlushTableIfNotExists()	Makes sure that the flush table is created in the database and that it at least has 1 row of data so that when flushes occur that the update succeeds without failure.
private void	fixMultiRowDataBug()	Cleans and resets the state of the flush table if multiple rows are detected.
void	flush(Scn currentScn)	Perform the Oracle LGWR process flush.
String	getHost()

Methods inherited from class java.lang.Object

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

Field Details

LOGGER

private static final org.slf4j.Logger LOGGER

CREATE_FLUSH_TABLE

private static final String CREATE_FLUSH_TABLE

See Also:

• Constant Field Values

INSERT_FLUSH_TABLE

private static final String INSERT_FLUSH_TABLE

See Also:

• Constant Field Values

UPDATE_FLUSH_TABLE

private static final String UPDATE_FLUSH_TABLE

See Also:

• Constant Field Values

DELETE_FLUSH_TABLE

private static final String DELETE_FLUSH_TABLE

See Also:

• Constant Field Values

connection

private final OracleConnection connection

closeConnectionOnClose

private final boolean closeConnectionOnClose

Constructor Details

CommitLogWriterFlushStrategy

public CommitLogWriterFlushStrategy(OracleConnection connection)

Creates a transaction-commit Oracle LogWriter (LGWR) process flush strategy. This will use the existing database connection to make the flush and the connection will not be automatically closed when the strategy is closed.

Parameters:

connection - the connection to be used to force the flush, must not be null

CommitLogWriterFlushStrategy

public CommitLogWriterFlushStrategy(JdbcConfiguration jdbcConfig)
                             throws SQLException

Creates a transaction-commit Oracle LogWriter (LGWR) process flush strategy. This will create a new database connection based on the supplied JDBC configuration and the connection will automatically be closed when the strategy is closed.

Parameters:

jdbcConfig - the jdbc configuration

Throws:

SQLException - if there was a database problem

Method Details

close

public void close()

Specified by:

close in interface AutoCloseable

getHost

public String getHost()

Specified by:

getHost in interface LogWriterFlushStrategy

Returns:

the host or ip address that will be flushed by the strategy

flush

public void flush(Scn currentScn)

Description copied from interface: LogWriterFlushStrategy

Perform the Oracle LGWR process flush.

Specified by:

flush in interface LogWriterFlushStrategy

Parameters:

currentScn - the current system change number

createFlushTableIfNotExists

private void createFlushTableIfNotExists()

Makes sure that the flush table is created in the database and that it at least has 1 row of data so that when flushes occur that the update succeeds without failure.

fixMultiRowDataBug

private void fixMultiRowDataBug()
                         throws SQLException

Cleans and resets the state of the flush table if multiple rows are detected. This bug was introduced in Debezium 1.7.0.Final by mistake and this function will self-correct the data managed by the table.

Throws:

SQLException - if a database exception occurs