[Freeswitch-users] Subscribing to events in managed C# / .NET
Michael Giagnocavo
mgg at giagnocavo.net
Tue Sep 8 19:06:54 PDT 2009
I'm not sure how EventConsumer is supposed to work - maybe one of the real devs can explain how pop works and if it should fail on pop 0 or not.
From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Phillip Jones
Sent: Tuesday, September 08, 2009 3:50 PM
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] Subscribing to events in managed C# / .NET
I build this out.
This seems to work fine:
ThreadPool.QueueUserWorkItem((o) =>
{
Log.WriteLine(LogLevel.Notice, "Thread Starting. ");
EventConsumer con = new EventConsumer("all", "");
while (true)
{
Event ev = con.pop(1);
Log.WriteLine(LogLevel.Alert, "Event: " + ev.GetHeader("Event-Name"));
//freeswitch.msleep(100);
}
});
With
Event ev = con.pop(0) however FS crashes with a System.NullReferenceException (attached)
On Tue, Sep 8, 2009 at 5:20 PM, Raffaele P. Guidi <raffaele.p.guidi at gmail.com<mailto:raffaele.p.guidi at gmail.com>> wrote:
Oh, I see... all those years wasted doing java stuff! :D
On Tue, Sep 8, 2009 at 22:46, Michael Giagnocavo <mgg at giagnocavo.net<mailto:mgg at giagnocavo.net>> wrote:
" ThreadPool.QueueUserWorkItem((o) =>"
That starts a lambda, which is compiled to a delegate, same as anonymous methods.
Guess I'll wait for him to respond on the crash he gets.
From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org>] On Behalf Of Raffaele P. Guidi
Sent: Tuesday, September 08, 2009 12:22 PM
To: freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] Subscribing to events in managed C# / .NET
Well, I can't see any delegate in josh sample, just a ThreadPool.QueueUserWorkItem. Here is an example that, at least on my system (I reached my home pc in the meanwhile), works fine.
public class LoadPluginDemo : ILoadNotificationPlugin {
delegate void Listener();
private void EventListener() {
EventConsumer con = new EventConsumer("all", null);
while (true){
Event ev = con.pop(1);
Log.WriteLine(LogLevel.Notice, "Got event " + ev.GetHeader("Event-Name"));
}
}
public bool Load() {
Log.WriteLine(LogLevel.Notice, "LoadDemo running.");
new Listener(EventListener).BeginInvoke(null,null);
return true;
}
}
On Tue, Sep 8, 2009 at 18:43, Michael Giagnocavo <mgg at giagnocavo.net<mailto:mgg at giagnocavo.net>> wrote:
That's what his sample does, but he says it crashes.
From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org>] On Behalf Of Raffaele P. Guidi
Sent: Tuesday, September 08, 2009 10:08 AM
To: freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] Subscribing to events in managed C# / .NET
Hi, you just have to use delegates to asynchronously call the function containing the loop and return back the control to the calling thread. Here an example (don't have my code at hand, hope it doesn't contain typos).
Regards,
Raffaele
public class TestLoop : ILoadNotificationPlugin
{
Delegate void DoStuffDelegate();
public void doStuff()
{
EventConsumer con = new EventConsumer("all", "");
while (true)
{
Event ev = con.pop(0);
Log.WriteLine(LogLevel.Notice, "Event: " + ev.serialized_string);
freeswitch.msleep(100);
}
}
public bool Load()
{
DoStuffDelegate dsdlg = new DoStuffDelegate(doStuff);
dsdlg.BeginInvoke();
}
}
On Tue, Sep 8, 2009 at 08:21, Josh Rivers <josh at radianttiger.com<mailto:josh at radianttiger.com>> wrote:
Thanks for the response!
I have tried putting a long-running loop here, but then it blocks anything else managed from happening:
public class TestLoop : ILoadNotificationPlugin
{
public bool Load()
{
EventConsumer con = new EventConsumer("all", "");
while (true)
{
Event ev = con.pop(0);
Log.WriteLine(LogLevel.Notice, "Event: " + ev.serialized_string);
freeswitch.msleep(100);
}
}
}
However, if I fork off a thread here, freeswitch crashes:
public class TestLoop : ILoadNotificationPlugin
{
public bool Load()
{
ThreadPool.QueueUserWorkItem((o) =>
{
Log.WriteLine(LogLevel.Notice, "Thread Starting. ");
EventConsumer con = new EventConsumer("all", "");
while (true)
{
Event ev = con.pop(0);
Log.WriteLine(LogLevel.Notice, "Event: " + ev.serialized_string);
freeswitch.msleep(100);
}
});
return true;
}
}
It doesn't look like this is a good place to start a long-running process?
Thanks!
Josh
On Mon, Sep 7, 2009 at 11:05 PM, Raffaele P. Guidi <raffaele.p.guidi at gmail.com<mailto:raffaele.p.guidi at gmail.com>> wrote:
Yes!
public class LoadDemo : ILoadNotificationPlugin {
public bool Load() {
Log.WriteLine(LogLevel.Notice, "LoadDemo running.");
return true;
}
}
this example is from Michael Giagnocavo's Demo.csx which you can find into the mod_managed svn.
And let me add that works like a charm :)
Ciao,
Raffaele
On Sun, Sep 6, 2009 at 22:50, Josh Rivers <josh at radianttiger.com<mailto:josh at radianttiger.com>> wrote:
Is there a way to start this when FreeSWITCH starts? The lua and perl modules have a 'startup-script' configuration preference. Is there something similar in mod_managed? Or is there a way to have an api command executed at a startup?
<quote author="Phillip Jones">
Exactly what I was after - thank you!
On Thu, Sep 3, 2009 at 1:54 PM, Jeff Lenk <jlenk at frontiernet.net<mailto:jlenk at frontiernet.net>> wrote:
>
> try something like this
>
> EventConsumer con = new EventConsumer("all", "");
> Event ev = con.pop(0);
>
> see lua sample -
> http://wiki.freeswitch.org/wiki/Lua#freeswitch.EventConsumer
>
>
> Phillip Jones-2 wrote:
> >
> > Hi there,
> >
> > mod_managed exposes EventReceivedFunction such that:
> >
> > Session.EventReceivedFunction = (e) =>
> > {
> > Log.WriteLine(LogLevel.Alert, "Received Event {0}", e.ToString());
> > return "";
> > };
> >
> > should trap all events to which i subscribe.
> >
> >
> > But how do I subscribe to events? What is the .NET / managed equivalent
> > of:
> >
> > switch_event_bind(const char *id, switch_event_types_t event, const char
> > *subclass_name, switch_event_callback_t callback, void *user_data);
> >
> >
> >
> > Thank you!
> >
> >
> >
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