org.deegree.io
Class DBConnectionPool

java.lang.Object
  org.deegree.io.DBConnectionPool

public class DBConnectionPool
extends java.lang.Object

class to manage a database connection pool. this is part of the combination of the object pool pattern an the singelton pattern.

Version:

07.02.2001

Author:

Andreas Poth

Method Summary

java.sql.Connection	acquireConnection(java.lang.String driver, java.lang.String database, java.util.Properties properties)
java.sql.Connection	acquireConnection(java.lang.String driver, java.lang.String database, java.lang.String user, java.lang.String password)
static DBConnectionPool	getInstance() realize singelton pattern using double checked locking pattern.
void	releaseConnection(java.sql.Connection con, java.lang.String driver, java.lang.String database, java.util.Properties properties) releases a connection back to the pool
void	releaseConnection(java.sql.Connection con, java.lang.String driver, java.lang.String database, java.lang.String user, java.lang.String password) releases a connection back to the pool

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static DBConnectionPool getInstance()

realize singelton pattern using double checked locking pattern.

Returns:

an instance of the data base pool. it is gauranteed that there exists only one instance of pool for each submitted class name.

acquireConnection

public java.sql.Connection acquireConnection(java.lang.String driver,
                                             java.lang.String database,
                                             java.lang.String user,
                                             java.lang.String password)
                                      throws DBPoolException

Parameters:

driver - driver to look for

database - the database to open

user - the username

password - the password.

Returns:

get a Connection from the Connection pool

Throws:

DBPoolException

acquireConnection

public java.sql.Connection acquireConnection(java.lang.String driver,
                                             java.lang.String database,
                                             java.util.Properties properties)
                                      throws DBPoolException

Parameters:

driver - driver to look for

database - the database to open

properties - the properties of the database

Returns:

get a Connection from the Connection pool

Throws:

DBPoolException

releaseConnection

public void releaseConnection(java.sql.Connection con,
                              java.lang.String driver,
                              java.lang.String database,
                              java.lang.String user,
                              java.lang.String password)
                       throws DBPoolException

releases a connection back to the pool

Parameters:

con - connections to be released

driver - driver to look for

database - the database to open

user - the username

password - the password.

Throws:

DBPoolException

releaseConnection

public void releaseConnection(java.sql.Connection con,
                              java.lang.String driver,
                              java.lang.String database,
                              java.util.Properties properties)
                       throws java.lang.Exception

releases a connection back to the pool

Parameters:

con - connections to be released

driver - driver to look for

database - the database to open

properties - containing username and password.

Throws:

java.lang.Exception