[infinispan-dev] ISPN-863 - Thoughts / Questions

[david marion]

I should have been more specific, notification delivery is not guaranteed. From http://download.oracle.com/javase/6/docs/api/java/lang/management/MemoryPoolMXBean.html:
 
"There is no guarantee about when the MemoryMXBean will emit a threshold notification and when the notification will be delivered. "
 
> Date: Fri, 14 Jan 2011 15:46:02 +0100
> From: bban at redhat.com
> To: infinispan-dev at lists.jboss.org
> Subject: Re: [infinispan-dev] ISPN-863 - Thoughts / Questions
> 
> 
> 
> On 1/14/11 3:32 PM, david marion wrote:
> >
> >
> > I agree. There are two ways to determine what the memory usage is, polling or notifications. The notification mechanism is not guaranteed
> 
> 
> Are you referring to MemoryMXBean / MemoryPoolMXBean ? What do you mean 
> by not guaranteed ? Are you suggesting the notfications are not 
> implemented by all JVM vendors ?
> 
> 
> > so we could have a background thread that polls to determine whether or not the threshold has been passed. Then in the put and replace methods, it would be the cost of checking a boolean value.
> 
> When notifications are available, we should use them, otherwise polling 
> would be fine, I guess.
> 
> 
> -- 
> Bela Ban
> Lead JGroups / Clustering Team
> JBoss
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