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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Wed, 09 Dec 2009 08:49:46 -0000
Message-ID: <20091209084946.12063.55313@eos.apache.org>
Subject: 
 =?utf-8?q?=5BJackrabbit_Wiki=5D_Update_of_=22QuestionsAndAnswers=22_by_Th?=
 =?utf-8?q?omasMueller?=

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Jackrabbit Wiki" fo=
r change notification.

The "QuestionsAndAnswers" page has been changed by ThomasMueller.
http://wiki.apache.org/jackrabbit/QuestionsAndAnswers?action=3Ddiff&rev1=3D=
49&rev2=3D50

--------------------------------------------------

  =

  A: For JCR 1.0, use string, or multiply by 100 and use long. For JCR 2.0,=
 use decimal. Using double is not recommended, because of rounding problems=
 : [[http://www.javaranch.com/journal/2003/07/MoneyInJava.html|Java Ranch]]=
 [[http://www.javapractices.com/topic/TopicAction.do?Id=3D13|Java Practices=
]].
  =

+ =3D=3D=3D Concurrency =3D=3D=3D
+ =

+ Jackrabbit does not support multiple threads concurrently reading from or=
 writing to the same session. Each session should only ever be accessed fro=
m one thread.
+ =

+ Multiple session however can read from the same repository concurrently. =

+ =

+ Also, multiple session can write to the repository concurrently, given th=
at they write to different nodes. Internally, Jackrabbit stores the list of=
 child nodes at the node itself, that means you can't concurrently add, mov=
e, or delete child nodes of the same node.
+=20