org.apache.xalan.lib.sql
Interface ConnectionPool
public
interface
ConnectionPool
An interface used to build wrapper classes around existing
Connection Pool libraries.
Title: ConnectionPool
Version: 1.0
Author: John Gentilin
Method Summary |
void | freeUnused()
Start downsizeing the pool, this usally happens right after the
pool has been marked as Inactive and we are removing connections
that are not currently inuse.
|
Connection | getConnection()
Retrive a database connection from the pool
|
boolean | hasActiveConnections()
Provide an indicator to the PoolManager when the Pool can be removed
from the Pool Table.
|
boolean | isEnabled()
Determine if a Connection Pool has been disabled. |
void | releaseConnection(Connection con)
Return a connection to the pool, the connection may be closed if the
pool is inactive or has exceeded the max number of free connections |
void | releaseConnectionOnError(Connection con)
Provide a mechinism to return a connection to the pool on Error.
|
void | setDriver(String d)
The Driver and URL are the only required parmeters. |
void | setMinConnections(int n)
Set tne minimum number of connections that are to be maintained in the
pool. |
void | setPassword(String p)
The rest of the protocol parameters can eiter be passed in as
just Username and Password or as a property collection. |
void | setPoolEnabled(boolean flag)
The Pool can be Enabled and Disabled. |
void | setProtocol(Properties p)
Used to pass in extra configuration options during the
database connect phase. |
void | setURL(String url) |
void | setUser(String u) |
boolean | testConnection()
Test to see if the connection info is valid to make a real connection
to the database. |
public void freeUnused()
Start downsizeing the pool, this usally happens right after the
pool has been marked as Inactive and we are removing connections
that are not currently inuse.
public Connection getConnection()
Retrive a database connection from the pool
Throws: SQLException
public boolean hasActiveConnections()
Provide an indicator to the PoolManager when the Pool can be removed
from the Pool Table.
public boolean isEnabled()
Determine if a Connection Pool has been disabled. If a Connection pool
is disabled, then it will only manage connections that are in use.
public void releaseConnection(Connection con)
Return a connection to the pool, the connection may be closed if the
pool is inactive or has exceeded the max number of free connections
Parameters: con
Throws: SQLException
public void releaseConnectionOnError(Connection con)
Provide a mechinism to return a connection to the pool on Error.
A good default behaviour is to close this connection and build
a new one to replace it. Some JDBC impl's won't allow you to
reuse a connection after an error occurs.
Parameters: con
Throws: SQLException
public void setDriver(String d)
The Driver and URL are the only required parmeters.
Parameters: d
public void setMinConnections(int n)
Set tne minimum number of connections that are to be maintained in the
pool.
Parameters: n
public void setPassword(String p)
The rest of the protocol parameters can eiter be passed in as
just Username and Password or as a property collection. If the
property collection is used, then the sperate username and password
may be ignored, it is up to the wrapper implementation to handle
the situation. If the connection information changes while after the
pool has been established, the wrapper implementation should ignore
the change and throw an error.
Parameters: p
public void setPoolEnabled(boolean flag)
The Pool can be Enabled and Disabled. Disabling the pool
closes all the outstanding Unused connections and any new
connections will be closed upon release.
Parameters: flag Control the Connection Pool. If it is enabled
then Connections will actuall be held around. If disabled
then all unused connections will be instantly closed and as
connections are released they are closed and removed from the pool.
public void setProtocol(Properties p)
Used to pass in extra configuration options during the
database connect phase.
public void setURL(String url)
public void setUser(String u)
public boolean testConnection()
Test to see if the connection info is valid to make a real connection
to the database. This method may cause the pool to be crated and filled
with min connections.
Copyright © 2005 Apache XML Project. All Rights Reserved.