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https://issues.apache.org/jira/browse/CURATOR-22?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Tschetter updated CURATOR-22:
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Attachment: CURATOR-22.patch
I apparently fail at patch creation. Hopefully this will work.
> Add a listener to LeaderLatch
> -----------------------------
>
> Key: CURATOR-22
> URL: https://issues.apache.org/jira/browse/CURATOR-22
> Project: Apache Curator
> Issue Type: Bug
> Components: Recipes
> Affects Versions: 2.0.0
> Reporter: Eric Tschetter
> Assignee: Jordan Zimmerman
> Attachments: CURATOR-22.patch
>
>
> From the mailing list:
> Hi guys,
> I'm looking at using Leader Latch and I noticed it only has polling
> mechanisms for figuring out if you are the leader. I was wondering if there
> is a reason to not have a callback mechanism that you can register with two
> methods:
> startBeingMaster();
> stopBeingMaster();
> Basically, any time setLeadership() is called with a value other than what it
> was, it would cause either startBeingMaster() to be called or
> stopBeingMaster() to be called.
> I can effect this using an extra thread and the polling mechanisms that are
> there, but am wondering if I'm the only one that would prefer to interact
> with it in this way or if others would also prefer to have access to this
> type of API?
> (Btw, for anyone wondering, I'm currently swapping out an old zookeeper
> client library for Curator and that's why I have all of these random
> questions about APIs and stuff)
> Jordan Zimmerman [email protected] via googlegroups.com
> 1:48 PM (2 hours ago)
> to curator-users
> Look at LeaderSelector. It is a leader recipe that has a callback mechanism.
> Jordan Zimmerman
> Eric Tschetter [email protected]
> 2:27 PM (2 hours ago)
> to curator-users
> Oh, that's the Leader Election recipe.
> I don't really like that abstraction either because it makes me worry about
> too much:
> 1) Losing connection, etc.
> 2) "Relinquishing" leadership
> I just want to either be the leader or not be the leader and have that choice
> be completely external. That is, I want something to tell me that I became
> the leader or that I lost leadership. I assume that I can always give up my
> leadership by just closing the thing down.
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