RE: [Jstyx-users] Re: question about CStyx.openOrCreate()

[Jon B. <jd...@ma...>]

 
> Actually, according to the rules of Styx you should create 
> directories with read permissions only.  Therefore your call:

Sorry, I meant to write that you should create directories and open them
with the mode OREAD only.  Nothing to do with permissions.

> -----Original Message-----
> From: jst...@li... 
> [mailto:jst...@li...] On Behalf Of 
> Jon Blower
> Sent: 12 May 2006 12:32
> To: jst...@li...
> Subject: RE: [Jstyx-users] Re: question about CStyx.openOrCreate()
> 
> Hi Tianchao,
> 
> Thanks for reporting this so clearly.  There is indeed a bug 
> in the OpenOrCreateCallback class.  The fix will be checked 
> into the SVN repository later, but in the meantime I've 
> attached the corrected version.
> 
> Actually, according to the rules of Styx you should create 
> directories with read permissions only.  Therefore your call:
> 
> file.openOrCreate(true, StyxUtils.OWRITE);
> 
> will return an error (although in the buggy version it went 
> into an infinite loop).  You should do this:
> 
> file.openOrCreate(true, StyxUtils.OREAD);
> 
> This may seem counter-intuitive but is logical.  The 
> StyxUtils.OREAD is the
> *mode* under which the newly-created directory is opened, not the
> *permissions* of the directory.  It is not legal to write to 
> directories so it is not legal to open them with mode OWRITE. 
>  You can create new files in the newly-created directory as normal.
> 
> Perhaps I should change the API to something more intuitive...
> 
> Jon
> 
> 
> > -----Original Message-----
> > From: jst...@li...
> > [mailto:jst...@li...] On Behalf 
> Of Tianchao 
> > Li
> > Sent: 11 May 2006 18:54
> > To: jst...@li...
> > Subject: [Jstyx-users] Re: question about CStyx.openOrCreate()
> > 
> > The problem only occurs if the first parameter is true (i.e. 
> > directory)
> > 
> > file.openOrCreate(true, StyxUtils.OWRITE);
> > 
> > Best regards,
> > Tianchao Li
> > 
> > On Thu, 2006-05-11 at 12:41 -0400, Tianchao Li wrote:
> > > Hi,
> > > 
> > > I have some problem with the correct usage of 
> CStyx.openOrCreate() 
> > > method.
> > > 
> > > I have started the following server:
> > > import java.io.IOException;
> > > 
> > > import uk.ac.rdg.resc.jstyx.StyxException;
> > > import uk.ac.rdg.resc.jstyx.server.DirectoryOnDisk;
> > > import uk.ac.rdg.resc.jstyx.server.StyxDirectory;
> > > import uk.ac.rdg.resc.jstyx.server.StyxServer;
> > > 
> > > 
> > > public class TestStyxServer {
> > > 
> > > 	/**
> > > 	 * @param args
> > > 	 */
> > > 	public static void main(String[] args) {
> > > 
> > >         StyxDirectory root;
> > > 		try {
> > > 			root = new StyxDirectory("/");
> > > 	        DirectoryOnDisk file = new
> > > DirectoryOnDisk("/home/lit/styxfilesystem");
> > > 	        root.addChild(file);
> > > 			new StyxServer(9876, root).start();
> > > 		} catch (StyxException e) {
> > > 			// TODO Auto-generated catch block
> > > 			e.printStackTrace();
> > > 		} catch (IOException e) {
> > > 			// TODO Auto-generated catch block
> > > 			e.printStackTrace();
> > > 		}
> > > 	}
> > > 
> > > }
> > > 
> > > and the following client:
> > > 
> > > import uk.ac.rdg.resc.jstyx.StyxException;
> > > import uk.ac.rdg.resc.jstyx.StyxUtils; import 
> > > uk.ac.rdg.resc.jstyx.client.CStyxFile;
> > > import uk.ac.rdg.resc.jstyx.client.StyxConnection;
> > > 
> > > 
> > > public class TestStyxClient {
> > > 
> > > 	/**
> > > 	 * @param args
> > > 	 */
> > > 	public static void main(String[] args) {
> > >         StyxConnection conn = new 
> StyxConnection("localhost", 9876);
> > >         try
> > >         {
> > >             conn.connect();
> > >             CStyxFile file =
> > conn.getFile("/styxfilesystem/test.txt");
> > >             file.openOrCreate(true, StyxUtils.OWRITE);
> > >             System.out.println(file.getURL());
> > >         }
> > >         catch (StyxException se)
> > >         {
> > >             se.printStackTrace();
> > >         }
> > >         finally
> > >         {
> > >             conn.close();
> > >         }
> > > 
> > > 	}
> > > 
> > > }
> > > 
> > > The client is blocked at file.openOrCreate(). Or more exactly, the
> > > callback.getReply() never returns.
> > > 
> > >     public void openOrCreate(boolean isDirectory, int 
> mode) throws 
> > > StyxException
> > >     {
> > >         StyxReplyCallback callback = new StyxReplyCallback();
> > >         this.openOrCreateAsync(isDirectory, mode, callback);
> > >         // Blocks until the process is complete
> > >         callback.getReply();
> > >     }
> > >     
> > > 
> > > Is this a bug?
> > > 
> > > Regards,
> > > Tianchao Li
> > > 
> > > 
> > 
> > 
> > 
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