[Opensource] addCacheEventListener (was ObservableDBObject: subscribing...)

[larry hamel]

This functionality already exists in DBObject as

    public static synchronized void addCacheEventListener(
                String senderClass,
                 CacheEventListener newListener)

the implementation is kinda dumb, but this is what I needed in API and intent.  I didn't make myself clear in my question...

larry

At 09:32 AM 4/23/2003, you wrote:
>At 12:42 AM 4/23/2003 -0700, you wrote:
>>hi,
>>
>>An application needs to know when a certain type of DBObject (call it ObservableDBObject) is added, updated, or deleted, in order to maintain a cache.
>>
>>The object could have some kind of static subscriber list (java.util.Observable?) and issue events as appropriate.
>>
>>Is there a better way?  Has anybody done this already?
>
>
>Larry,
>
>This has been started several times in various formats.  The code called SysEventHub was Mike N's last start in that.  It's completely agreed that something like this is needed.
>
>My only concern that I've seen so far is instantiation order.  There's several places that implement UserListener, for example, but were never instantiated and thus properly registered as UserListeners.  [eforum still needs to be fixed in this way]
>
>So we need is a lifecycle event somehow where DBObjects are initialized, which allows them to register listeners to various other dbobjects. [Also, how do we determine initialization order?]
>
>Currently on initialization, Schemas load DBObjects, so it would probably be when the DBobjects are initially loaded.
>
>Anyway, that's my thoughts on the issue ;)
>                                                -Mike
>
>
>
>
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