[Biojava-dev] AnnotationForwarder

[Schreiber, Mark]

OK so no need to 'fix' the BioSQL stuff then.

I'm going to make all references to the AnnotationForwarder transient so
that listeners don't get dragged into serialization.

- Mark


> -----Original Message-----
> From: Thomas Down [mailto:td2@sanger.ac.uk] 
> Sent: Friday, 1 November 2002 2:18 p.m.
> To: biojava-dev@biojava.org
> Subject: Re: [Biojava-dev] AnnotationForwarder
> 
> 
> On Fri, Nov 01, 2002 at 01:59:12PM +1300, Schreiber, Mark wrote:
> > Would it be a good idea to add a method to Annotatable called
> > getAnnotationForwarder() as a reminder that the AnnotationForwarder 
> > needs to be implemented?
> > 
> > Obviously this would break lots of stuff so might not be a very 
> > attractive solution.
> 
> Please no.
> 
> The AbstractChangable/ChangeSupport/ChangeForwarder 
> mechanisms are a reasonable stab at providing a `general 
> purpose' implementation of the ChangeEvent framework, 
> especially since Matthew refactored them and thrashed them 
> about a bit.  However, if you've got events being forwarder 
> around a fairly complex graph of objects, the number of 
> ChangeSupport and ChangeListener objects can 
> rapidly become large.  Their existence also means that any 
> object which has listeners is effectively `locked' into 
> memory.  This just doesn't worth for big databases.  I've 
> implemented a number of systems which ignore these default 
> implementations.  The most obvious is the latest incarnation 
> of the biojava-biosql.  This has a ChangeHub object which 
> fakes all the event forwarding behind the scenes, even if an 
> event is actually being forwarded through an object which 
> isn't currently loaded in memory.
> 
> While I welcome any attempt to identify and fix classes which 
> are genuinely missing necessary event-handling logic (and I 
> know there are a number of these), it should still be 
> possible to write objects which use non-standard event 
> implementations (or, for that matter, no implementation at 
> all in cases where this underlying data isn't going to change).
> 
>      Thomas.
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