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From "L (JIRA)" <j...@apache.org>
Subject [jira] [Created] (VFS-640) Synchronized AbstractOriginatingFileProvider.getFileSystem is too broad
Date Wed, 02 Aug 2017 11:28:00 GMT
L created VFS-640:
---------------------

             Summary: Synchronized AbstractOriginatingFileProvider.getFileSystem is too broad
                 Key: VFS-640
                 URL: https://issues.apache.org/jira/browse/VFS-640
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: 2.1, 2.0
            Reporter: L


Currently (rev. 1802455) this method looks like this:


{code:java}
    protected synchronized FileSystem getFileSystem(final FileName rootName, final FileSystemOptions
fileSystemOptions)
        throws FileSystemException
    {
        FileSystem fs = findFileSystem(rootName, fileSystemOptions);
        if (fs == null)
        {
            // Need to create the file system, and cache it
            fs = doCreateFileSystem(rootName, fileSystemOptions);
            addFileSystem(rootName, fs);
        }
        return fs;
    }
{code}

Given that there is a single instance of a provider per scheme, a very slow server that is
being accessed first time will block *all* other threads trying to access some other resources
via the same provider.
We have a server that takes sometimes 20-30 seconds in doCreateFileSystem. We do not mind
the thread trying to access this method taking that long, but because of that "synchronized"
we end up having multiple threads accessing unrelated servers for the same scheme blocked.



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