Another curious question. How do you obtain a reference to your Registry in
your webapplication? In your example, you merely assign the Registry
reference to a local variable and start Jetty. How does your webapp get a
reference to this registry instance? You could set an attribute on every
WebApplicationContext you create by doing...
Registry registry = RegistryBuilder.constructDefaultRegistry();
Server server = new Server();
server.addWebApplication("/MyApp", "./context/").setAttribute("registry",
registry);
server.addWebApplication("/MyOtherApp",
"./otherContext/").setAttribute("registry", registry);
server.setTrace(true);
SocketListener listener = new SocketListener();
listener.setPort(8081);
listener.setMinThreads(5);
listener.setMaxThreads(250);
server.addListener(listener);
server.start();
That way, your registry would be server-wide, as you're injecting it into
each web application. Then, in your webapps, you could accesss it be
reading it off of the servlet context. How does that sound?
-----Original Message-----
From: Geoff Hopson [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 26, 2005 5:43 AM
To: [EMAIL PROTECTED]
Cc: [email protected]
Subject: Re: [Newbie] Singletons starting twice
OK - I set this up, but it still looks like the registry is set up in
the Main thread along with my singleton service, and then when the
first servlet request comes in, the registry is loaded again on one of
the web server listener threads. All subsequent calls use this second
registry.
Is this something to do with the <filter-mapping> stuff in web.xml?
Is it not possible to have a JVM-wide HiveMind registry?
On 5/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Hi,
>
> You could try adding a ServletContextListener to the webapp and
> initialize the registry in contextInitialized. That should be called as
> soon as the webapp is loaded, and before any requests come in.
>
> Best wishes
>
> John
>
> -----Original Message-----
> From: Geoff Hopson [mailto:[EMAIL PROTECTED]
> Sent: Thursday, May 26, 2005 9:59 AM
> To: [email protected]
> Subject: Re: [Newbie] Singletons starting twice
>
>
> Thanks for the help so far. Maybe I'm being dumb (again), but here's
> what I want.
>
> I have a web services-based application. I need to get some
> configuration from a database loaded up BEFORE I receive my first web
> srevice request, since connecting to the database, fetching, loading,
> rejigging etc takes time I haven't got when I recieve my first web
> service call.
>
> Therefore I want my HiveMind service to init BEFORE the web server
> starts up, so that all my ducks are in a row before I start receiving
> calls.
>
> I have a main in my startup class that starts up the web server (Jetty).
>
> Creating the registry in this main method doesn't work, because the
> Jetty listener threads have no idea that the registry has been started
> (since I haven't received a request yet, I can't use HiveMindFilter).
>
> Here's a dump of the main chunk of my Main method...
>
> // eagerload my service by constructing registry
> Registry registry = RegistryBuilder.constructDefaultRegistry();
> // my service has now been created and inited. Who-hoo...
> // now start jetty...
> Server server = new Server(); server.addWebApplication("/MyApp",
> "./context/"); server.setTrace(true); SocketListener listener = new
> SocketListener(); listener.setPort(8081);
> listener.setMinThreads(5);
> listener.setMaxThreads(250);
> server.addListener(listener);
> server.start();
> // And we are ready to receive our first caller...
>
>
> Trouble is, the first web service request comes in, and the HiveMind
> registry gets reloaded into the first Listener thread that responds,
> along with all the initialisation I think I have already done.
>
> Thanks again for any insights.
>
> Geoff
>
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