Hi Ken:
A JDBCMessageResources class already exists. I believe that James Mitchell wrote it. After a quick search, I couldn't find any additional links to it, however.
Ken Pullin wrote:
I've been looking into extending the MessageResources class and providing my own MessageResourcesFactory. The end goal is to house the ApplicationResource files in a database table. The issue I'm noticing is that the MessageResources class maintains a HashMap of key/values called 'formats'. So any class that extends MessageResources only get's called when the particular value is not in the cache(hashmap) in the MessageResource class. This is the method that gets called in the MessageResources class:
String formatKey = messageKey(locale, key); synchronized (formats) { format = (MessageFormat) formats.get(formatKey); if (format == null) { String formatString = getMessage(locale, key); if (formatString == null) { if (returnNull) return (null); else return ("???" + formatKey + "???"); } format = new MessageFormat(escape(formatString)); formats.put(formatKey, format); }
}
Notice how the 1st step is to check to see if the formats hashmap contains the key. If it doesn't it then calls the getMessage(locale,key) which is provided by my implemenation class. At that point, it gets back a value and then puts it on the HashMap.
The problem I'm having is when I want to update a value. How do you tell the MessageResources class to refresh it's cache. This becomes even more complicated if the application resides in a clustered environment. You could use OJB or even Entity Bean to retrieve the data from the database in the Custom Implemenation, but you still have the problem with the MessageResources class maintaining a seperate cache. The EJB or OJB classes would contain the correct values, but the cache at the parent level would not. I basically need a way when a value gets updated to tell the MessageResources class to either 1) clear it's cache all together or 2) take the value off of the HashMap so the next call to it would go to my custom implementation.
I hope this wasn't 2 confusing....
Thanks
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