[RFC][plugin]: fix concurrency problems in PAV.java

[Denis Lila]

Hi.

I found a few problems in PluginAppletViewer.java.
We were modifying/reading from two static hash maps
concurrently. The hash maps were "applets" and "status".
status was only modified in a synchronized method,
but we were reading from it outside of that method and
that's unsafe.

As far as I can tell, there are no group of operations
that need to happen atomically, so using ConcurrentHashMaps
should be enough.

I've also done a bit of refactoring (removing dead code,
adding some SuppressWarnings annotations, making members
private, etc).

Any criticism is appreciated.

Thank you,
Denis.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PAVConcur.patch
Type: text/x-patch
Size: 11481 bytes
Desc: not available
Url : http://mail.openjdk.java.net/pipermail/distro-pkg-dev/attachments/20110412/d5c648e9/PAVConcur.patch