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A pooling interface.
ObjectPool defines a trivially simple pooling interface. The only
required methods are borrowObject and returnObject.
Example of use:
Object obj = null;
try {
obj = pool.borrowObject();
//...use the object...
} catch(Exception e) {
//...handle any exceptions...
} finally {
// make sure the object is returned to the pool
if(null != obj) {
pool.returnObject(obj);
}
} |
BaseObjectPool for a simple base implementation.
| Method Summary | |
void |
addObject()
Create an object using my factory or other
implementation dependent mechanism, and place it into the pool. |
Object |
borrowObject()
Obtain an instance from my pool. |
void |
clear()
Clears any objects sitting idle in the pool, releasing any associated resources (optional operation). |
void |
close()
Close this pool, and free any resources associated with it. |
int |
getNumActive()
Return the number of instances currently borrowed from my pool (optional operation). |
int |
getNumIdle()
Return the number of instances currently idle in my pool (optional operation). |
void |
invalidateObject(Object obj)
Invalidates an object from the pool By contract, obj MUST have been obtained using borrowObject
or a related method as defined in an implementation
or sub-interface. |
void |
returnObject(Object obj)
Return an instance to my pool. |
void |
setFactory(PoolableObjectFactory factory)
Sets the factory I use
to create new instances (optional operation). |
| Method Detail |
public void addObject()
throws Exception
factory or other
implementation dependent mechanism, and place it into the pool.
addObject() is useful for "pre-loading" a pool with idle objects.
(Optional operation).
Exception
public Object borrowObject()
throws Exception
returnObject
or a related method as defined in an implementation
or sub-interface.
The behaviour of this method when the pool has been exhausted is not specified (although it may be specified by implementations).
Exception
public void clear()
throws Exception,
UnsupportedOperationException
UnsupportedOperationException - if this implementation does not support the operation
Exception
public void close()
throws Exception
Exception
public int getNumActive()
throws UnsupportedOperationException
UnsupportedOperationException - if this implementation does not support the operation
public int getNumIdle()
throws UnsupportedOperationException
borrowed
without creating any new instances.
UnsupportedOperationException - if this implementation does not support the operation
public void invalidateObject(Object obj)
throws Exception
borrowObject
or a related method as defined in an implementation
or sub-interface.
This method should be used when an object that has been borrowed
is determined (due to an exception or other problem) to be invalid.
If the connection should be validated before or after borrowing,
then the PoolableObjectFactory.validateObject(java.lang.Object) method should be
used instead.
obj - a borrowed instance to be returned.
Exception
public void returnObject(Object obj)
throws Exception
borrowObject
or a related method as defined in an implementation
or sub-interface.
obj - a borrowed instance to be returned.
Exception
public void setFactory(PoolableObjectFactory factory)
throws IllegalStateException,
UnsupportedOperationException
factory I use
to create new instances (optional operation).
factory - the PoolableObjectFactory I use to create new instances.
IllegalStateException - when the factory cannot be set at this time
UnsupportedOperationException - if this implementation does not support the operation
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