james strachan updated ZOOKEEPER-78:

    Attachment: writeLock_protocol_version3.patch

Here is an improved version. 

* we use more optimal comparison by using a ZNodeName object which caches the 
prefix & sequence number for ordering node names. We can also use this to order 
node names using different prefixes - maybe useful for read/write locks
* fixed a bug and enhanced the test case so that we now test that a leader is 
established; then when that leader fails another leader/owner is created

> added a high level protocol/feature - for easy Leader Election or exclusive 
> Write Lock creation
> -----------------------------------------------------------------------------------------------
>                 Key: ZOOKEEPER-78
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-78
>             Project: Zookeeper
>          Issue Type: New Feature
>          Components: java client
>    Affects Versions: 3.0.0
>            Reporter: james strachan
>            Assignee: james strachan
>         Attachments: writeLock_protocol_version3.patch
> Here's a patch which adds a little WriteLock helper class for performing 
> leader elections or creating exclusive locks in some directory znode. Note 
> its an early cut; am sure we can improve it over time. The aim is to avoid 
> folks having to use the low level ZK stuff but provide a simpler high level 
> abstraction.

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