RFC: Netx - Implement SingeInstanceService

[Omair Majid]

Hi,

The attached patch adds support for SingleInstanceService to Netx.

It creates a lock file under ~/.netx/locks/ once an application adds a 
SingleInstanceListener to the SingleInstanceService. A second instance 
of the application sees this lock file, sends it's arguments to the 
first instance and shuts down.

ChangeLog:
2009-06-18  Omair Majid  <omajid at redhat.com>

     *rt/net/sourceforge/jnlp/Launcher.java
     (launchApplication): Check for any existing single instance.
     Dont start a second instance.
     *rt/net/sourceforge/jnlp/resources/Messages.properties: Add
     RNoLockDir.
     *rt/net/sourceforge/jnlp/services/ExtendedSingleInstanceService.java
     New file.
     *rt/net/sourceforge/jnlp/services/InstanceExistsException.java: New
     file.
     *rt/net/sourceforge/jnlp/services/ServiceUtil.java
     (getSingleInstanceService): New function.
     (checkExistingSingleInstance): New function.
     *rt/net/sourceforge/jnlp/services/SingleInstanceLock.java: New
     file.
     *rt/net/sourceforge/jnlp/services/XServiceManagerStub.java: Add
     SingleInstanceService to serviceNames. Create a new instance of
     XSingleInstanceService as a privileged proxy.
     *rt/net/sourceforge/jnlp/services/XSingleInstanceService.java: New
     file.

Any comments?

Cheers,
Omair
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