org.deegree_impl.io
Class DBConnectionPool

java.lang.Object
  org.deegree_impl.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.

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Version:

07.02.2001

Author:

Andreas Poth

Field Summary

private static DBConnectionPool	instance
private java.util.HashMap	pools

Constructor Summary

private

DBConnectionPool() Creates a new DBConnectionPool object.

Method Summary

java.sql.Connection	acuireConnection(java.lang.String driver, java.lang.String database, java.util.Properties properties) get an object from the object pool
java.sql.Connection	acuireConnection(java.lang.String driver, java.lang.String database, java.lang.String user, java.lang.String password) get an object from the object pool
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

Field Detail

instance

private static DBConnectionPool instance

pools

private java.util.HashMap pools

Constructor Detail

DBConnectionPool

private DBConnectionPool()

Creates a new DBConnectionPool object.

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.

acuireConnection

public java.sql.Connection acuireConnection(java.lang.String driver,
                                            java.lang.String database,
                                            java.lang.String user,
                                            java.lang.String password)
                                     throws java.lang.Exception

get an object from the object pool

Throws:

java.lang.Exception

acuireConnection

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

get an object from the object pool

Throws:

java.lang.Exception

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 java.lang.Exception

releases a connection back to the pool

Throws:

java.lang.Exception

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

Throws:

java.lang.Exception