Re: [ jEdit-devel ] Plugin Development: Lifecycle of VFSSession

[Slava P. <sl...@je...>]

Hi,

A session's object lifecycle typically goes like this:

- User invokes an I/O operation from the GUI. For example, opening a
  file.

  This takes place in the AWT thread, and creates a new VFS session
  using createVFSSession().

  A work request is then queued if the session was created successfully.

- The work request makes I/O calls (those that start with _).

- When finished, the work request calls _endVFSSession().

Calls to _createInputStream() are not guaranteed to be balanced with
calls to _createOutputStream(). So you need to handle locking some other
way.

On Wed, Jun 25, 2003 at 04:43:19PM +0200, Torsten Schlabach wrote:
> Dear list,
> 
> working on a Plugin I just wanted to clarify how the VFSSession is supposed
> to be used.
> 
> My understanding was:
> 
> If the user opens a file, the createVFSSession method is called. Let's
> assume the file system in question requires a login. The plugin will create a user
> session with the filesystem and return it as the result of its
> implementation of the createCFSSession method.
> 
> If a function that starts with an underscore such as _createInputStream is
> called this session object is passed back and can be used to access that
> existsing session with the file system. So no need for the plugin to hold onto the
> session information somewhere else.
> 
> Am I right?
> 
> This all works fine except for the _createOutputStream. If I try to save the
> file, a new call to createVFSSession is issued somewhere out of jEdit's code
> which leads to a new file system session being established which may (or in
> my case does) lead to conflicts as the original session holds a lock on the
> file that I will never be able to release.
> 
> Did I miss anything?
> 
> Torsten
> 
> 
> 
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-- 
Slava Pestov