Hi Thomas, you might take a look at this JIRA

there's definitely been interest in this area, however there are some real challenges as well. Most users do end up wrapping the basic api with some code, esp the "retry" metaphor is a common case, so I think it would be valuable. At the same time getting the semantics right is hard (and covering all the corner cases). Perhaps you could sync up with Aaron/Chris, I'd personally like to see this go into contrib, but I understand the extra burden the patch process presents -- it may make more sense to rapidly iterate on something like github and then move to contrib once you have something less frequently changing, where the patch issue would be less of a problem (see 679, there's discussion on this there). Regardless which way you take it we'd be happy to work with you.



ps. you might also take a look at recipes - it would be great if the recipes were compatible with either interface

On 05/26/2010 06:09 AM, Thomas Koch wrote:

for my current code I'm using zkclient[1] and have also looked at cages[2] for
some ZK usage examples. I observed, that there's a common pattern to wrap ZK
operations in callables and feed them to a "retryUntilConnected" executor.

Now my idea is, that ZK should already come with operations in classes, e.g.:

o.a.z.operation.Create extends Operation implements callable{

   private path, data[], acl, createMode

   public Create( .. all kind of ctors .. )

   public call(){
     .. move code from Zookeeper.create() here

Similiar classes should be provided for getChildren, delete, exists, getData,
getACL, setACL and setData.

One could then feed such operations to an ZkExecutor, which has the necessary
knowledge about the ZkConnection and can execute a command either
synchronously or asynchronously.

One could also wrap operations in an ExceptionCatcher to ignore certain
Exceptions or in a RetryPolicy.

This is only an idea so far, but I wanted to share my thoughts before starting
to try it out. (BTW: You can meet me at BerlinBuzzwords.de)

[1] http://github.com/sgroschupf/zkclient
[2] http://code.google.com/p/cages/

Best regards,

Thomas Koch, http://www.koch.ro

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