[infinispan-dev] Grid singletons using Infinispan ?

[Mircea Markus]

here is the continuous query link
[1]  http://community.jboss.org/wiki/ContinuousQuerywithInfinispan
On 22 Oct 2010, at 17:19, Mircea Markus wrote:

> 
> On 21 Oct 2010, at 10:34, Tristan Tarrant wrote:
> 
>> On Thu, Oct 21, 2010 at 11:08, Galder Zamarreño <galder at redhat.com> wrote:
>> 
>> On Oct 21, 2010, at 9:42 AM, Tristan Tarrant wrote:
>> 
>> > I have browsed quickly through the Infinispan docs, but I haven't found anything that would help me with what I need.
>> > In the past I have used JBoss' feature for deploying cluster-wide singletons, but obviously this is app-server-dependent. Is it possible to use Infinispan to implement the same thing ?
>> 
>> Hmmm, Infinispan is not an app server and hence does not do deployments, so not sure what you refer to.
>> 
>> 
>> I didn't explain myself properly. I don't want Infinispan to implement cluster singletons for me, but I would like to leverage Infinispan's features to implement the singleton myself. For example by binding a key in the cache to its owner (the first node to put() the key in the cache). If the owner "disappears", someone else might take ownership of that key.
> Not sure I get your example entirely: key ownership is already happening if you use numOwners>0, as keys have backups. Also when you talk about a singleton in AS I'm rather thinking about a service that gets executed on a single node only about sheer state.
> I've used something similar for implementing clustered continuous query[1].
> What I have is a "pice of code" that is notified whenever something changes in the cache. The code gets executed on a single node. If that node crashes then a different node takes the responsibility of executing it etc.  At the moment is quite limited: doesn't support distribution only total replication. 
> [1]
>> 
>> This can be done with JGroups, but I wanted something a bit more "abstracted" from the transport's implementation.
>> 
>> Tristan
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