org.apache.commons.pool
Class BaseKeyedObjectPool

java.lang.Object
  |
  +--org.apache.commons.pool.BaseKeyedObjectPool

All Implemented Interfaces:

KeyedObjectPool

Direct Known Subclasses:

GenericKeyedObjectPool, StackKeyedObjectPool

public abstract class BaseKeyedObjectPool

extends Object

implements KeyedObjectPool

A simple base impementation of ObjectPool. All optional operations are implemented as throwing UnsupportedOperationException.

Version:

$Revision: 1.3 $ $Date: 2002/05/03 17:01:06 $

Author:

Rodney Waldhoff

Constructor Summary

BaseKeyedObjectPool()

Method Summary

abstract Object	borrowObject(Object key) Obtain an instance from my pool for the specified key.
void	clear() Not supported in this base implementation.
void	clear(Object key) Not supported in this base implementation.
void	close() Does nothing this base implementation.
int	getNumActive() Not supported in this base implementation.
int	getNumActive(Object key) Not supported in this base implementation.
int	getNumIdle() Not supported in this base implementation.
int	getNumIdle(Object key) Not supported in this base implementation.
abstract void	returnObject(Object key, Object obj) Return an instance to my pool.
void	setFactory(KeyedPoolableObjectFactory factory) Not supported in this base implementation.

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseKeyedObjectPool

public BaseKeyedObjectPool()

Method Detail

borrowObject

public abstract Object borrowObject(Object key)
                             throws Exception

Description copied from interface: KeyedObjectPool

Obtain an instance from my pool for the specified key. By contract, clients MUST return the borrowed object using returnObject, or a related method as defined in an implementation or sub-interface, using a key that is equivalent to the one used to borrow the instance in the first place.

Specified by:

borrowObject in interface KeyedObjectPool

Parameters:

key - the key used to obtain the object

Returns:

an instance from my pool.

Exception

clear

public void clear()
           throws Exception,
                  UnsupportedOperationException

Not supported in this base implementation.

Specified by:

clear in interface KeyedObjectPool

Throws:

UnsupportedOperationException - when this implementation doesn't support the operation

Exception

clear

public void clear(Object key)
           throws Exception,
                  UnsupportedOperationException

Not supported in this base implementation.

Specified by:

clear in interface KeyedObjectPool

Parameters:

key - the key to clear

Throws:

UnsupportedOperationException - when this implementation doesn't support the operation

Exception

close

public void close()
           throws Exception

Does nothing this base implementation.

Specified by:

close in interface KeyedObjectPool

Exception

getNumActive

public int getNumActive()
                 throws UnsupportedOperationException

Not supported in this base implementation.

Specified by:

getNumActive in interface KeyedObjectPool

Returns:

the total number of instances currently borrowed from my pool

Throws:

UnsupportedOperationException - when this implementation doesn't support the operation

getNumActive

public int getNumActive(Object key)
                 throws UnsupportedOperationException

Not supported in this base implementation.

Specified by:

getNumActive in interface KeyedObjectPool

Parameters:

key - the key

Returns:

the number of instances corresponding to the given key currently borrowed in my pool

Throws:

UnsupportedOperationException - when this implementation doesn't support the operation

getNumIdle

public int getNumIdle()
               throws UnsupportedOperationException

Not supported in this base implementation.

Specified by:

getNumIdle in interface KeyedObjectPool

Returns:

the total number of instances currently idle in my pool

Throws:

UnsupportedOperationException - when this implementation doesn't support the operation

getNumIdle

public int getNumIdle(Object key)
               throws UnsupportedOperationException

Not supported in this base implementation.

Specified by:

getNumIdle in interface KeyedObjectPool

Parameters:

key - the key

Returns:

the number of instances corresponding to the given key currently idle in my pool

Throws:

UnsupportedOperationException - when this implementation doesn't support the operation

returnObject

public abstract void returnObject(Object key,
                                  Object obj)
                           throws Exception

Description copied from interface: KeyedObjectPool

Return an instance to my pool. By contract, obj MUST have been obtained using borrowObject or a related method as defined in an implementation or sub-interface, using a key that is equivalent to the one used to borrow the Object in the first place.

Specified by:

returnObject in interface KeyedObjectPool

Parameters:

key - the key used to obtain the object

obj - a borrowed instance to be returned.

Exception

setFactory

public void setFactory(KeyedPoolableObjectFactory factory)
                throws IllegalStateException,
                       UnsupportedOperationException

Not supported in this base implementation.

Specified by:

setFactory in interface KeyedObjectPool

Parameters:

factory - the KeyedPoolableObjectFactory I use to create new instances.

Throws:

IllegalStateException - when the factory cannot be set at this time

UnsupportedOperationException - when this implementation doesn't support the operation