[Freeswitch-users] Subscribing to events in managed C# / .NET
Phillip Jones
pjintheusa at gmail.com
Tue Sep 8 14:50:27 PDT 2009
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> 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>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] *On Behalf Of *Raffaele P.
>> Guidi
>> *Sent:* Tuesday, September 08, 2009 12:22 PM
>>
>> *To:* 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>
>> 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] *On Behalf Of *Raffaele P.
>> Guidi
>> *Sent:* Tuesday, September 08, 2009 10:08 AM
>>
>>
>> *To:* 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> 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> 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> 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> 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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