util.sql
Class ConnectionManager

java.lang.Object
  util.sql.ConnectionManager

public class ConnectionManager
extends java.lang.Object

creates a pool of connections to DB for performance reasons

Field Summary

private java.util.Vector<java.sql.Connection>	connectionPool
private java.lang.String	databaseUrl
private java.lang.String	driver
private int	MAX_POOL_SIZE
private java.lang.String	password
private java.lang.String	username

Constructor Summary

ConnectionManager()
Constructor default

ConnectionManager(java.lang.String driver, java.lang.String databaseUrl, java.lang.String username, java.lang.String password, int maxPoolSize)

Method Summary

private boolean	checkIfConnectionPoolIsFull()
boolean	connectionSuccess()
private java.sql.Connection	createNewConnectionForPool() creates new connection to db
java.sql.Connection	getConnectionFromPool()
private void	initializeConnectionPool() fills connectionPool with connections for numConnections < MAX_POOL_SIZE
void	returnConnectionToPool(java.sql.Connection connection) Adding the connection from the client back to the connectionPool

Methods inherited from class java.lang.Object

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

Field Detail

driver

private java.lang.String driver

databaseUrl

private java.lang.String databaseUrl

username

private java.lang.String username

password

private java.lang.String password

connectionPool

private java.util.Vector<java.sql.Connection> connectionPool

MAX_POOL_SIZE

private int MAX_POOL_SIZE

Constructor Detail

ConnectionManager

public ConnectionManager()

Constructor default

ConnectionManager

public ConnectionManager(java.lang.String driver,
                         java.lang.String databaseUrl,
                         java.lang.String username,
                         java.lang.String password,
                         int maxPoolSize)

Parameters:

driver - which dbc driver

databaseUrl - -

username - -

password - -

maxPoolSize - - how many db-connection should the ConnectionManager allocate

Method Detail

initializeConnectionPool

private void initializeConnectionPool()

fills connectionPool with connections for numConnections < MAX_POOL_SIZE

checkIfConnectionPoolIsFull

private boolean checkIfConnectionPoolIsFull()

Returns:

connectionPool.size() < MAX_POOL_SIZE

createNewConnectionForPool

private java.sql.Connection createNewConnectionForPool()

creates new connection to db

Returns:

new connection

getConnectionFromPool

public java.sql.Connection getConnectionFromPool()

Returns:

a connection out of the connectionPool

returnConnectionToPool

public void returnConnectionToPool(java.sql.Connection connection)

Adding the connection from the client back to the connectionPool

Parameters:

connection - -

connectionSuccess

public boolean connectionSuccess()

Returns:

true, if there is at least one connection to the db