org.datanucleus.store.rdbms

Class ConnectionProviderPriorityList

java.lang.Object

org.datanucleus.store.rdbms.ConnectionProviderPriorityList

All Implemented Interfaces:

ConnectionProvider

public class ConnectionProviderPriorityList
extends Object
implements ConnectionProvider

Utility class for Failover.

Constructor Summary

Constructors

Constructor and Description
ConnectionProviderPriorityList()

Method Summary

Methods

Modifier and Type	Method and Description
Connection	getConnection(DataSource[] ds) Obtain a connection from the datasources, starting on the first datasource, and if unable to obtain a connection skips to the next one on the list, and try again until the list is exhausted.
void	setFailOnError(boolean flag) Flag if an error causes the operation to thrown an exception, or false to skip to next DataSource.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConnectionProviderPriorityList

public ConnectionProviderPriorityList()

Method Detail

setFailOnError

public void setFailOnError(boolean flag)

Description copied from interface: ConnectionProvider

Flag if an error causes the operation to thrown an exception, or false to skip to next DataSource. If an error occurs on the last DataSource on the list an Exception will be thrown no matter if failOnError is true or false. This is a hint. Implementations may ignore the user setting and force it's own behaviour

Specified by:

setFailOnError in interface ConnectionProvider

Parameters:

flag - true if to fail on error

getConnection

public Connection getConnection(DataSource[] ds)
                         throws SQLException

Obtain a connection from the datasources, starting on the first datasource, and if unable to obtain a connection skips to the next one on the list, and try again until the list is exhausted.

Specified by:

getConnection in interface ConnectionProvider

Parameters:

ds - the array of datasources. An ordered list of datasources

Returns:

the Connection, null if ds is null, or null if the DataSources has returned a null as connection

Throws:

SQLException - in case of error and failOnError is true or the error occurs while obtaining a connection with the last DataSource on the list