Package io.debezium.storage.jdbc

Class RetriableConnection

java.lang.Object

io.debezium.storage.jdbc.RetriableConnection

All Implemented Interfaces:

AutoCloseable

public class RetriableConnection
extends Object
implements AutoCloseable

Class encapsulates a java.sql.Connection. It provides executeWithRetry method to execute code snippet that interacts with the connection. If that fails with SQLRecoverableException, it will try to re-create new connection and perform the complete code snippet again (first, it performs rollback if specified in params). It attempts to reconnect number of times as specified in io.debezium.storage.jdbc.JdbcCommonConfig.PROP_MAX_RETRIES and there is a delay in between per io.debezium.storage.jdbc.JdbcCommonConfig.PROP_WAIT_RETRY_DELAY The code snippet provided should handle commit of its own if required. The connection is marked as autocommit = false

Author:

Jiri Kulhanek

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	RetriableConnection.ConnectionConsumer
static interface	RetriableConnection.ConnectionFunction<T>

Field Summary

Fields

Modifier and Type	Field	Description
private Connection	conn
private static final org.slf4j.Logger	LOGGER
private final int	maxRetryCount
private final String	pwd
private final String	url
private final String	user
private final Duration	waitRetryDelay

Constructor Summary

Constructors

Constructor	Description
RetriableConnection(String url, String user, String pwd, Duration waitRetryDelay, int maxRetryCount)

Method Summary

Modifier and Type	Method	Description
void	close()
private void	createConnection()
void	executeWithRetry(RetriableConnection.ConnectionConsumer consumer, String name, boolean rollback)	execute code snippet where no value is returned.
private <T> T	executeWithRetry(RetriableConnection.ConnectionFunction<T> func, RetriableConnection.ConnectionConsumer consumer, String name, boolean rollback)
<T> T	executeWithRetry(RetriableConnection.ConnectionFunction<T> func, String name, boolean rollback)	execute code snippet which returns some value.
boolean	isOpen()

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

url

private final String url

user

private final String user

pwd

private final String pwd

waitRetryDelay

private final Duration waitRetryDelay

maxRetryCount

private final int maxRetryCount

conn

private Connection conn

Constructor Details

RetriableConnection

public RetriableConnection(String url,
 String user,
 String pwd,
 Duration waitRetryDelay,
 int maxRetryCount)
                    throws SQLException

Throws:

SQLException

Method Details

createConnection

private void createConnection()
                       throws SQLException

Throws:

SQLException

close

public void close()
           throws SQLException

Specified by:

close in interface AutoCloseable

Throws:

SQLException

isOpen

public boolean isOpen()

executeWithRetry

public void executeWithRetry(RetriableConnection.ConnectionConsumer consumer,
 String name,
 boolean rollback)
                      throws SQLException

execute code snippet where no value is returned.

Parameters:

consumer - code snippet to execute

name - name of the operation being executed (for logging purposes)

rollback - if set to true, the rollback will be called in case of SQLException

Throws:

SQLException - sql connection related exception

executeWithRetry

public <T> T executeWithRetry(RetriableConnection.ConnectionFunction<T> func,
 String name,
 boolean rollback)
                       throws SQLException

execute code snippet which returns some value.

Parameters:

func - code snippet to execute

name - name of the operation being executed (for logging purposes)

rollback - if set to true, the rollback will be called in case of SQLException

Throws:

SQLException - sql connection related exception

executeWithRetry

private <T> T executeWithRetry(RetriableConnection.ConnectionFunction<T> func,
 RetriableConnection.ConnectionConsumer consumer,
 String name,
 boolean rollback)
                        throws SQLException

Throws:

SQLException