Re: [Wrapper-user] communicate to a wrapped service

[Leif M. <le...@ta...>]

Barry,
    It depends on exactly what it is that you want to trigger.
Is it a life cycle  action of the Wrapper to to start a piece of
arbitrary code in your server.

    I assume the later.

1)  The Wrapper allows you to capture and react to user defined
service control codes by registering a WrapperEventListener
using the following method call:
WrapperManager.addWrapperEventListener(l,WrapperEventListener.EVENT_FLAG_SERVICE);
    Your listener will then receive WrapperServiceControlEvents
whenever your service receives any control code, including user
codes.
   The drawback here is with the ability to easily send those
custom codes.  Do you know of a way to do it from the command
prompt?

2) The way I have done it in the past is to use the WrapperActionServer
class.  This creates a very simple telnet server which receives one
character commands and then immediately closes the connections.
It comes with a number of predefined commands, but you can also
register your own using the registerAction method which takes the
trigger character and a Runnable instance.
A sample code fragment can be found in the javadocs for
WrapperActionServer.

    This solution works nicely as you can control it from anywhere
by simply using a telnet client.  The drawback is that it is not very
secure as currently implemented.   That could be resolved by adding
Passwords, IP masks etc, but it is not in there at the moment.

    See the javadocs for documentation on all of the above:
http://wrapper.tanukisoftware.org/doc/english/javadocs.html

Cheers,
Leif

Barry Andrews wrote:
> Hi All,
>
> I am in the process of evaluating Java Service Wrapper for Windows and I 
> am wondering if there is a built in way to communicate to a wrapped 
> service?
>
> I have some code that I need to run as a Windows service and I need to 
> be able to communicate to it from another process and tell it to run. On 
> Windows you have you have the ServiceBase.OnCustomCommand listener.
>
> I have thought about different ways to communicate this event to the 
> service. One way is programmatically pausing the service, ( "net pause 
> <service name>" ) and continuing it when I need it to run. The problem 
> with this is it needs to work for someone logged in as a regular "User", 
> not just an admin. The service would have admin privileges, but the 
> program may only have User privileges.
>
> I also thought about communicating via ports, but I didn't know if there 
> was some communication functionality already built in that I was just 
> overlooking? Any thoughts on this?
>
> Many thanks to you all.
>
> -B
>
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