VFS transport should support a locking mechanism
------------------------------------------------

                 Key: ESBJAVA-602
                 URL: https://wso2.org/jira/browse/ESBJAVA-602
             Project: WSO2 ESB
          Issue Type: Improvement
          Components: Core Engine
    Affects Versions: 2.1
         Environment: all env
            Reporter: Ruwan Linton
            Assignee: Ruwan Linton
            Priority: Highest
             Fix For: 2.2


This issue is raised by a user (Harm Verhagen) on the user list, and the issue 
reads as;

<quote>
Say you have one server uploading flat files to a directory (scp). You have the 
ESB processing that library using the vfs file listener. to prevent that the 
ESB starts processing a file is is partially uploaded we'd like to put a file 
(eg:  lock.txt) in the directory, that blocks reading that file).
</quote>

Further this could be extended to support cluster of servers polling the same 
directory and the file to be not picked by two servers on the same cluster.

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