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Java Source Code / Java Documentation » Web Framework » anvil » anvil.database

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

anvil.database .ConnectionPool

ConnectionPool

public class ConnectionPool implements ConnectionMonitor(Code)

Pool for storing limited amount of connections as PooledConnection. Pool is used by ConnectionAccessQueue which takes care of the situations when connections aren't immediately available.

Methods which might alter the connection vectors are internally synchronized so that only one thread at a time can perform operations on them. However several threads may be creating connections at the same time.

See Also:   PooledConnection
See Also:   ConnectionAccessQueue
See Also:   ConnectionFactory
version:
   $Revision: 1.16 $
author:
   Jani Lehtim�ki

Inner Class :public class ConnectionAllocator extends Thread

Constructor Summary
public	ConnectionPool(Zone zone, PoolPreferences prefs) Constructs the pool.

Method Summary
public PooledConnection	acquire(int timeout) Acquires new connection from the pool.
public void	connectionAcquireTimedout(ConnectionPool pool, long duration)
public void	connectionClosed(PooledConnection connection)
public void	connectionCreated(PooledConnection connection, long duration)
public void	connectionException(String source, Exception exception)
public void	connectionReleased(PooledConnection connection)
public void	connectionReserved(PooledConnection connection, long duration)
public void	connectionTimeout(PooledConnection connection)
public int	getActiveConnections() Gets the current amount of connections active.
public int	getConnectionAcquireTimeout() Gets the connection reservation timeout.
public int	getConnectionLifetime() Gets the connection lifetime.
public int	getConnectionTimeout() Gets the connection reservation timeout.
public String	getDriver() Gets the class of driver.
public int	getFreeConnections() Gets the current amount of connections free.
public int	getMaxConnections() Gets the maximum amount of connections.
public int	getMinConnections() Gets the recommended minimum amount of connections.
public String	getName() Gets the name of pool.
public String	getPassword()
public int	getPendingConnections() Gets the current amount of pending connections, ie.
public Object	getPreference(String name) Gets preference by name from PoolPreferences.
public int	getTotalConnections() Gets the current amount of connections on this pool.
public String	getURL()
public String	getUsername()
public Zone	getZone() Gets the zhe for this pool.
public void	initialize(ConnectionPool pool)
public void	release(PooledConnection connection) Notifies pool about the connection being released.
void	setObserver(ConnectionObserver observer) Sets the connection observer.
void	stop() Shuts the pool down.

Constructor Detail

ConnectionPool
public ConnectionPool(Zone zone, PoolPreferences prefs)(Code)
	Constructs the pool. Parameters: name - Name of pool Parameters: factory - Connection factory Parameters: min - Recommended minimum amount of connections Parameters: max - Absolute maximum amount of connections Parameters: lifetime - Lifetime of connection (ms) Parameters: checkTimeout - Period after which connections are checked out (ms)

Method Detail

acquire
public PooledConnection acquire(int timeout) throws Exception(Code)
	Acquires new connection from the pool. Strategy: `freeConnections` vector is scanned through for a usable connection from the beginning until one is found. If total amount of connections is less than maximum amount of connections, a new connection is created. Parameters: timeout - Timeout override (if > 0) Connection or `null` if it couldn't be created

connectionAcquireTimedout
public void connectionAcquireTimedout(ConnectionPool pool, long duration)(Code)

connectionClosed
public void connectionClosed(PooledConnection connection)(Code)

connectionCreated
public void connectionCreated(PooledConnection connection, long duration)(Code)

connectionException
public void connectionException(String source, Exception exception)(Code)

connectionReleased
public void connectionReleased(PooledConnection connection)(Code)

connectionReserved
public void connectionReserved(PooledConnection connection, long duration)(Code)

connectionTimeout
public void connectionTimeout(PooledConnection connection)(Code)

getActiveConnections
public int getActiveConnections()(Code)
	Gets the current amount of connections active. Amount of active connections

getConnectionAcquireTimeout
public int getConnectionAcquireTimeout()(Code)
	Gets the connection reservation timeout. When this period is exceed connection is unconditionally closed. Connection timeout, milliseconds

getConnectionLifetime
public int getConnectionLifetime()(Code)
	Gets the connection lifetime. Lifetime may be exceed if the connection is reserved. Connection lifetime, milliseconds

getConnectionTimeout
public int getConnectionTimeout()(Code)
	Gets the connection reservation timeout. When this period is exceed connection is unconditionally closed. Connection timeout, milliseconds

getDriver
public String getDriver()(Code)
	Gets the class of driver. Connection timeout, milliseconds

getFreeConnections
public int getFreeConnections()(Code)
	Gets the current amount of connections free. Amount of free connections

getMaxConnections
public int getMaxConnections()(Code)
	Gets the maximum amount of connections. Maximum amount of connections

getMinConnections
public int getMinConnections()(Code)
	Gets the recommended minimum amount of connections. Minimum amount of connections

getName
public String getName()(Code)
	Gets the name of pool. Name of pool

getPassword
public String getPassword()(Code)

getPendingConnections
public int getPendingConnections()(Code)
	Gets the current amount of pending connections, ie. connections that currently being opened. Amount of pending connections

getPreference
public Object getPreference(String name)(Code)
	Gets preference by name from PoolPreferences.

getTotalConnections
public int getTotalConnections()(Code)
	Gets the current amount of connections on this pool. Amount of connections

getURL
public String getURL()(Code)

getUsername
public String getUsername()(Code)

getZone
public Zone getZone()(Code)
	Gets the zhe for this pool. Connection timeout, milliseconds

initialize
public void initialize(ConnectionPool pool)(Code)

release
public void release(PooledConnection connection)(Code)
	Notifies pool about the connection being released. Allocator thread is interrupted immediately because active connections now contains released connection whose state need to be checked. Parameters: connection - Connection

setObserver
void setObserver(ConnectionObserver observer)(Code)
	Sets the connection observer. (Package visibility.) Parameters: Connection - observer

stop
void stop()(Code)
	Shuts the pool down. Allocator thread is stopped and all connections are unconditionally released and closed. See Also: ConnectionPool.ConnectionAllocator

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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