On Fri, 9 Nov 2001 01:39, Paul Hammant wrote:
> How about an Interface PersistableBlock that implemented the following
> methods :-
>
> Object persist();
> void unPersist(Object persistedForm);
>
> Phoenix, on shutdown, could persist the block. If built-in, the
> unPersist method would come just before initialize() in terms of lifecycle;
I would prefer it not to be a kernel service.
> As a slight alternative, it could be a Cornerstone interface and a
> separate block (with defautl impl). That block could, on stop(), invoke
> the persist() method it it's dependancy. It could similarly invoke
> unPersist for on start(). That default block could take a number of
> configurations, including one that had a cron based automatic
> persistence scheme.
Instead of doing it as dependencies how about instead using the newly added
BlockListener. In fact it was these application wide non-lifecycle "aspects"
that led to creation of BlockListener. Your code would look something like
blockAdded
The logic would be something like the followin
class PersistantListener
{
private Persistor m_persistor;
private ArrayList m_persistants = new ArrayList();
void blockAdded( BlockEvent event )
{
final Block block = event.getBlock();
if( block instanceof Persistant )
{
m_persistants.add( block );
}
if( null == m_persistor && block instanceof Persistor )
{
m_persistor = (Persistor)block;
int size = m_persistants.size();
for( int i = 0; i < size; i++ )
{
final Block other = (Block)m_persistants.get( i );
m_persistor.load( (Persistant)other );
}
}
else if( null != _m_persistor )
{
m_persistor.load( (Persistant)block );
}
}
void blockRemoved()
{
//reverse above
}
}
So in this case you would have a Persistor Block that persists all the other
blocks that want it. We also have Persistent Blocks who want to be persisted.
The above code will tell the Persistor about all the persistents in the .sar
That work for you ?
--
Cheers,
Pete
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