org.mentawai.db

Class C3P0ConnectionHandler

java.lang.Object

org.mentawai.db.AbstractConnectionHandler

org.mentawai.db.C3P0ConnectionHandler

All Implemented Interfaces:

org.mentacontainer.Factory, org.mentacontainer.Interceptor<Connection>, ConnectionHandler

public class C3P0ConnectionHandler
extends AbstractConnectionHandler

A connection handler that uses the C3P0 connection pool. (http://sourceforge.net/projects/c3p0) To use this class you must have the C3P0 jar in your /WEB-INF/lib directory. You may access the underlying C3P0's ComboPooledDataSource to configure the pool, before you start calling getConnection().

Author:

Sergio Oliveira

Nested Class Summary

Nested classes/interfaces inherited from interface org.mentawai.db.ConnectionHandler

ConnectionHandler.Exec

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	DEBUG

Constructor Summary

Constructors

Constructor and Description
C3P0ConnectionHandler(String driver, String url, String user, String pass)
C3P0ConnectionHandler(String driver, String url, String user, String pass, String testQuery) Constructs a C3P0ConnectionHandler with C3P0's ComboPooledDataSource.

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy() Destroy the connection pool, closing and cleaning all connections.
Object	getBean()
com.mchange.v2.c3p0.ComboPooledDataSource	getComboPooledDataSource() Gets the underlying C3P0's ComboPooledDataSource.
Connection	getConnection() Returns a Connection to the database.
String	getStatus() Print the status of this connection pool if any.
void	release(Connection conn) Release this connection.

Methods inherited from class org.mentawai.db.AbstractConnectionHandler

exec, getInstance, getType, onCleared, onCreated

Methods inherited from class java.lang.Object

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

Field Detail

DEBUG

public static boolean DEBUG

Constructor Detail

C3P0ConnectionHandler

public C3P0ConnectionHandler(String driver,
                     String url,
                     String user,
                     String pass,
                     String testQuery)

Constructs a C3P0ConnectionHandler with C3P0's ComboPooledDataSource.

Parameters:

driver - The JDBC driver class name to use.

url - The JDBC url to connect to the database.

user - The database username to use.

pass - The database password to use.

testQuery - The test sql statement used to test the db connection.

Throws:

IllegalStateException - If the C3P0 jar is not in the /WEB-INF/lib directory or if the JDBC driver cannot be loaded.

C3P0ConnectionHandler

public C3P0ConnectionHandler(String driver,
                     String url,
                     String user,
                     String pass)

Method Detail

getStatus

public String getStatus()

Description copied from interface: ConnectionHandler

Print the status of this connection pool if any.

Returns:

The status

getComboPooledDataSource

public com.mchange.v2.c3p0.ComboPooledDataSource getComboPooledDataSource()

Gets the underlying C3P0's ComboPooledDataSource.

Returns:

The ComboPooledDataSource

getConnection

public Connection getConnection()
                         throws SQLException

Description copied from interface: ConnectionHandler

Returns a Connection to the database. Notice that it can never return null. If no connection can be acquired, then a SQLException is thrown.

Returns:

A connection to the database.

Throws:

SQLException - if there were problems trying to acquire the connection.

release

public void release(Connection conn)

Description copied from interface: ConnectionHandler

Release this connection. If this connection handler is using a database pool, the connection is returned to the pool. If this connection handler is not using a database pool, the connection is closed. If the connection passed as an argument is null, nothing is done.

Parameters:

conn - The connection to release.

getBean

public Object getBean()
               throws InstantiationException

Throws:

InstantiationException

destroy

public void destroy()

Description copied from interface: ConnectionHandler

Destroy the connection pool, closing and cleaning all connections. This is important for restarting the web context.