[RFC][Icedtea-Web]: Don't allow itw-settings to remove cache items when plugin in use

[Deepak Bhole]

* Andrew Su <asu at redhat.com> [2011-04-20 10:35]:
> Hi,
> 
> This patch is to make it so itw-settings won't remove cached items if plugin/javaws is in use.
> 
> Perhaps a messagebox to inform the user of a running instance?
> 

Please post changelog entry.

Also, if there is no lock file, the cache won't get cleared. We cannot
assume that the lock file will always exist.

Cheers,
Deepak

> Regards,
>  Andrew

> diff -r bc48727cfc1a netx/net/sourceforge/jnlp/controlpanel/CachePane.java
> --- a/netx/net/sourceforge/jnlp/controlpanel/CachePane.java	Wed Apr 20 09:26:50 2011 -0400
> +++ b/netx/net/sourceforge/jnlp/controlpanel/CachePane.java	Wed Apr 20 10:34:54 2011 -0400
> @@ -26,6 +26,9 @@
>  import java.awt.GridLayout;
>  import java.awt.event.ActionEvent;
>  import java.awt.event.ActionListener;
> +import java.io.FileNotFoundException;
> +import java.io.IOException;
> +import java.nio.channels.FileLock;
>  import java.text.SimpleDateFormat;
>  import java.util.ArrayList;
>  import java.util.List;
> @@ -125,8 +128,17 @@
>          deleteButton.addActionListener(new ActionListener() {
>              @Override
>              public void actionPerformed(ActionEvent e) {
> +                String netxRunningFile = config.getProperty(DeploymentConfiguration.KEY_USER_NETX_RUNNING_FILE);
> +                FileLock fl = null;
> +                try {
> +                    fl = FileUtils.getFileLock(netxRunningFile, false, false);
> +                } catch (FileNotFoundException e1) {
> +                    e1.printStackTrace();
> +                }
> +                
>                  int row = cacheTable.getSelectedRow();
>                  try {
> +                    if (fl == null) return;
>                      if (row == -1 || row > cacheTable.getRowCount() - 1)
>                          return;
>                      int modelRow = cacheTable.convertRowIndexToModel(row);
> @@ -141,6 +153,15 @@
>                  } catch (Exception exception) {
>                      //ignore
>                  }
> +                
> +                if (fl != null) {
> +                    try {
> +                        fl.release();
> +                        fl.channel().close();
> +                    } catch (IOException e1) {
> +                        e1.printStackTrace();
> +                    }
> +                }
>              }
>          });
>          buttons.add(deleteButton);