Package org.nuxeo.common.utils

Class JDBCUtils

java.lang.Object

org.nuxeo.common.utils.JDBCUtils

public class JDBCUtils
extends Object

Helper for common JDBC-related operations.

Since:

7.3

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MAX_TRIES	Maximum number of times we retry a call if the server says it's overloaded.

Constructor Summary

Constructors

Constructor	Description
JDBCUtils()

Method Summary

Modifier and Type	Method	Description
static <V> V	callWithRetry(Callable<V> callable)	Tries to do a JDBC call even when the server is overloaded.
static Connection	getConnection(String url, String user, String password)	Tries to acquire a Connection through the DriverManager even when the server is overloaded.
static Connection	getConnection(DataSource dataSource)	Tries to acquire a Connection through a DataSource even when the server is overloaded.
static XAConnection	getXAConnection(XADataSource xaDataSource)	Tries to acquire a XAConnection through a XADataSource even when the server is overloaded.

Methods inherited from class java.lang.Object

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

Field Details

MAX_TRIES

public static final int MAX_TRIES

Maximum number of times we retry a call if the server says it's overloaded.

See Also:

• Constant Field Values

Constructor Details

JDBCUtils

public JDBCUtils()

Method Details

callWithRetry

public static <V> V callWithRetry(Callable<V> callable)
                           throws SQLException

Tries to do a JDBC call even when the server is overloaded.

Oracle has problems opening and closing many connections in a short time span (ORA-12516, ORA-12519). It seems to have something to do with how closed sessions are not immediately accounted for by Oracle's PMON (process monitor). When we get these errors, we retry a few times with exponential backoff.

Parameters:

callable - the callable

Returns:

the returned value

Throws:

SQLException

getConnection

public static Connection getConnection(String url,
 String user,
 String password)
                                throws SQLException

Tries to acquire a Connection through the DriverManager even when the server is overloaded.

Parameters:

url - a database url of the form jdbc:subprotocol:subname

user - the database user on whose behalf the connection is being made

password - the user's password

Returns:

a connection to the URL

Throws:

SQLException

getConnection

public static Connection getConnection(DataSource dataSource)
                                throws SQLException

Tries to acquire a Connection through a DataSource even when the server is overloaded.

Parameters:

dataSource - the data source

Returns:

a connection to the data source

Throws:

SQLException

getXAConnection

public static XAConnection getXAConnection(XADataSource xaDataSource)
                                    throws SQLException

Tries to acquire a XAConnection through a XADataSource even when the server is overloaded.

Parameters:

xaDataSource - the XA data source

Returns:

a XA connection to the XA data source

Throws:

SQLException