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Posted to user@zookeeper.apache.org by Narasimha Tadepalli <Na...@pervasive.com> on 2012/11/13 20:47:52 UTC
getChildren question.
Does anybody have any idea about importance of object parameter in this below method? What exactly it does if we provide some object? Documentation didn't provide any details about this extra parameter. Appreciate your time.
public void getChildren(String path,
Watcher watcher,
AsyncCallback.ChildrenCallback<http://zookeeper.apache.org/doc/r3.4.4/api/org/apache/zookeeper/AsyncCallback.ChildrenCallback.html> cb,
Object ctx)
http://zookeeper.apache.org/doc/r3.4.4/api/index.html
for example
zk.getChildren("/node/child1/subchild", watcher, childrencallback, Context.MESSAGE);
where Context is enum
private enum Context {
MESSAGE,
LOCK;
}
NOTICE: All information in and attached to this email may be proprietary, confidential, privileged and otherwise protected from improper or erroneous disclosure. If you are not the sender's intended recipient, you are not authorized to intercept, read, print, retain, copy, forward, or disseminate this message.
RE: getChildren question.
Posted by Narasimha Tadepalli <Na...@pervasive.com>.
Hi Michi
Thanks a lot. That helped me a bit.
-Narasimha
-----Original Message-----
From: mutsuzaki@gmail.com [mailto:mutsuzaki@gmail.com] On Behalf Of Michi Mutsuzaki
Sent: Tuesday, November 13, 2012 2:30 PM
To: user@zookeeper.apache.org
Cc: zookeeper-user@hadoop.apache.org; dev@zookeeper.apache.org
Subject: Re: getChildren question.
Hi Narasimha,
It's an opaque object. Zookeeper client doesn't do anything with it, except that it's passed back to the callback. It's useful when you need to pass some kind of context to the callback.
--Michi
On Tue, Nov 13, 2012 at 11:47 AM, Narasimha Tadepalli <Na...@pervasive.com> wrote:
> Does anybody have any idea about importance of object parameter in this below method? What exactly it does if we provide some object? Documentation didn't provide any details about this extra parameter. Appreciate your time.
>
>
>
> public void getChildren(String path,
>
> Watcher watcher,
>
>
> AsyncCallback.ChildrenCallback<http://zookeeper.apache.org/doc/r3.4.4/
> api/org/apache/zookeeper/AsyncCallback.ChildrenCallback.html> cb,
>
> Object ctx)
>
> http://zookeeper.apache.org/doc/r3.4.4/api/index.html
>
>
> for example
>
> zk.getChildren("/node/child1/subchild", watcher, childrencallback,
> Context.MESSAGE);
>
>
> where Context is enum
>
> private enum Context {
>
> MESSAGE,
> LOCK;
> }
> NOTICE: All information in and attached to this email may be proprietary, confidential, privileged and otherwise protected from improper or erroneous disclosure. If you are not the sender's intended recipient, you are not authorized to intercept, read, print, retain, copy, forward, or disseminate this message.
NOTICE: All information in and attached to this email may be proprietary, confidential, privileged and otherwise protected from improper or erroneous disclosure. If you are not the sender's intended recipient, you are not authorized to intercept, read, print, retain, copy, forward, or disseminate this message.
RE: getChildren question.
Posted by Narasimha Tadepalli <Na...@pervasive.com>.
Hi Michi
Thanks a lot. That helped me a bit.
-Narasimha
-----Original Message-----
From: mutsuzaki@gmail.com [mailto:mutsuzaki@gmail.com] On Behalf Of Michi Mutsuzaki
Sent: Tuesday, November 13, 2012 2:30 PM
To: user@zookeeper.apache.org
Cc: zookeeper-user@hadoop.apache.org; dev@zookeeper.apache.org
Subject: Re: getChildren question.
Hi Narasimha,
It's an opaque object. Zookeeper client doesn't do anything with it, except that it's passed back to the callback. It's useful when you need to pass some kind of context to the callback.
--Michi
On Tue, Nov 13, 2012 at 11:47 AM, Narasimha Tadepalli <Na...@pervasive.com> wrote:
> Does anybody have any idea about importance of object parameter in this below method? What exactly it does if we provide some object? Documentation didn't provide any details about this extra parameter. Appreciate your time.
>
>
>
> public void getChildren(String path,
>
> Watcher watcher,
>
>
> AsyncCallback.ChildrenCallback<http://zookeeper.apache.org/doc/r3.4.4/
> api/org/apache/zookeeper/AsyncCallback.ChildrenCallback.html> cb,
>
> Object ctx)
>
> http://zookeeper.apache.org/doc/r3.4.4/api/index.html
>
>
> for example
>
> zk.getChildren("/node/child1/subchild", watcher, childrencallback,
> Context.MESSAGE);
>
>
> where Context is enum
>
> private enum Context {
>
> MESSAGE,
> LOCK;
> }
> NOTICE: All information in and attached to this email may be proprietary, confidential, privileged and otherwise protected from improper or erroneous disclosure. If you are not the sender's intended recipient, you are not authorized to intercept, read, print, retain, copy, forward, or disseminate this message.
NOTICE: All information in and attached to this email may be proprietary, confidential, privileged and otherwise protected from improper or erroneous disclosure. If you are not the sender's intended recipient, you are not authorized to intercept, read, print, retain, copy, forward, or disseminate this message.
Re: getChildren question.
Posted by Michi Mutsuzaki <mi...@cs.stanford.edu>.
Hi Narasimha,
It's an opaque object. Zookeeper client doesn't do anything with it,
except that it's passed back to the callback. It's useful when you
need to pass some kind of context to the callback.
--Michi
On Tue, Nov 13, 2012 at 11:47 AM, Narasimha Tadepalli
<Na...@pervasive.com> wrote:
> Does anybody have any idea about importance of object parameter in this below method? What exactly it does if we provide some object? Documentation didn't provide any details about this extra parameter. Appreciate your time.
>
>
>
> public void getChildren(String path,
>
> Watcher watcher,
>
> AsyncCallback.ChildrenCallback<http://zookeeper.apache.org/doc/r3.4.4/api/org/apache/zookeeper/AsyncCallback.ChildrenCallback.html> cb,
>
> Object ctx)
>
> http://zookeeper.apache.org/doc/r3.4.4/api/index.html
>
>
> for example
>
> zk.getChildren("/node/child1/subchild", watcher, childrencallback, Context.MESSAGE);
>
>
> where Context is enum
>
> private enum Context {
>
> MESSAGE,
> LOCK;
> }
> NOTICE: All information in and attached to this email may be proprietary, confidential, privileged and otherwise protected from improper or erroneous disclosure. If you are not the sender's intended recipient, you are not authorized to intercept, read, print, retain, copy, forward, or disseminate this message.
Re: getChildren question.
Posted by Michi Mutsuzaki <mi...@cs.stanford.edu>.
Hi Narasimha,
It's an opaque object. Zookeeper client doesn't do anything with it,
except that it's passed back to the callback. It's useful when you
need to pass some kind of context to the callback.
--Michi
On Tue, Nov 13, 2012 at 11:47 AM, Narasimha Tadepalli
<Na...@pervasive.com> wrote:
> Does anybody have any idea about importance of object parameter in this below method? What exactly it does if we provide some object? Documentation didn't provide any details about this extra parameter. Appreciate your time.
>
>
>
> public void getChildren(String path,
>
> Watcher watcher,
>
> AsyncCallback.ChildrenCallback<http://zookeeper.apache.org/doc/r3.4.4/api/org/apache/zookeeper/AsyncCallback.ChildrenCallback.html> cb,
>
> Object ctx)
>
> http://zookeeper.apache.org/doc/r3.4.4/api/index.html
>
>
> for example
>
> zk.getChildren("/node/child1/subchild", watcher, childrencallback, Context.MESSAGE);
>
>
> where Context is enum
>
> private enum Context {
>
> MESSAGE,
> LOCK;
> }
> NOTICE: All information in and attached to this email may be proprietary, confidential, privileged and otherwise protected from improper or erroneous disclosure. If you are not the sender's intended recipient, you are not authorized to intercept, read, print, retain, copy, forward, or disseminate this message.