[RFC][Icedtea-web]: Changed how cache works.

[Andrew Su]

Oops forgot to attach patch.

----- Original Message -----
> Hi,
> 
> I have attached a patch for changing how cache stores its entries to
> fix some problems that existed in the current cache system.
> 
> Right now the jar files may be overwritten by another plugin/javaws
> when a new version is pushed while the user is using an old version
> (prior update) then open another instance of the applet/javaws. With
> the patch this gets fixed by creating a new location for the update to
> be downloaded to instead of overwriting the current file.
> 
> [I'm going to use applet, but assume I mean applet+javaws]
> Another issue with the current one is.. When loading the same applet
> twice (or more), it could detect that it's not current and both applet
> would download to the same place. In the patch, we will wait for the
> download to finish first then check if we have already downloaded it.
> If so just proceed without re-downloading.
> 
> This patch makes the cache keep track of the most recently used items
> and remove items until we hit the cache limit if set.
> 
> Changelog:
> 
> 2011-04-04 Andrew Su <asu at redhat.com>
> 
> * netx/net/sourceforge/jnlp/cache/CacheEntry.java:
> (markForDelete, lock, unlock): New methods.
> * netx/net/sourceforge/jnlp/cache/CacheUtil.java:
> (getCacheFile): Changed to look for most recently used item, and when
> not found create a new entry.
> (makeNewCacheFile, cleanCache, lockFile, unlockFile,
> lockRecentlyUsedFile, unlockRecentlyUsedFile): New methods.
> * netx/net/sourceforge/jnlp/cache/ResourceTracker.java:
> (downloadResource): Changed to wait if we are already downloading the
> file. If file downloaded is compressed, mark compressed and extracted
> files for delete at shutdown.
> (initializeResource): Added checks for when the cache needs updating
> to create new folder entry.
> * netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java:
> (JNLPClassLoader): Change order so that we get resources first then
> check permissions for the jars.
> * netx/net/sourceforge/jnlp/runtime/JNLPRuntime.java:
> (markNetxRunning): Add call to clean up cache directory.
> * netx/net/sourceforge/jnlp/util/FileUtils.java:
> (getFileLock): New method.
> 
> Any questions or comments welcome.
> 
> Cheers,
> Andrew
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