On Mon, Feb 21, 2011 at 4:28 PM, Ceki Gülcü <ceki@qos.ch> wrote:

Hello César,

Logback does not use any synchronization when invoking turbo filters.
TurboFilters needs to ensure they are thread safe on their own. The fact that DuplicateMessageFilter does not synchronize on LinkedHashMap is probably a bug. Could you please enter a bug report for the issue you just discovered?

On 21/02/2011 3:28 PM, César Álvarez Núñez wrote:

Hi all,

I would like to known if TurboFilter is multithread-safe or not since
the manual does not say anything about it.

Reviewing
https://github.com/ceki/logback/blob/master/logback-classic/src/main/java/ch/qos/logback/classic/turbo/DuplicateMessageFilter.java
I have seen that a it makes use of a LinkedHashMap
(http://download.oracle.com/javase/6/docs/api/java/util/LinkedHashMap.html)
which requires synchronization in case of multithread access.

BR,
/César.

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