[Cppcms-users] Fw: Unmount asynchronous application from application pool
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[Cppcms-users] Fw: Unmount asynchronous application from application pool
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From: Artyom B. <art...@ya...> - 2013-11-19 08:13:11
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On Tuesday, November 19, 2013 10:05 AM, Artyom Beilis <art...@ya...> wrote:
What handler to be called?
>
>
>I assume you are working on linux. If you want to reload the application/system per SIGHUP you need
>create appropriate singal handler. Signals are not just callbacks, they are very different. They do stuff differently.
>
>
>Also I'm not even sure about what are you trying to do.
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>
>See this is the original code:
>
>
> while(1) {
> cppcms::service srv(...)
> srv.run();
> if(got_sighup) {
> got_sighup = false;
> continue;
> }
> break;
> }
>
>
>
>
>Now lets say you want to add an async application:
>
>
> while(1) {
> booster::intrusive_ptr<myapp> p(new myapp)
> cppcms::service srv(...)
> srv.mount(p,...)
> srv.run();
> p = 0; // reset there...
> if(got_sighup) {
> got_sighup = false;
> continue;
>
> }
> break;
> }
>
>
>Thats it... How hard can it be?
>
>
>Artyom Beilis
>--------------
>CppCMS - C++ Web Framework: http://cppcms.com/
>CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>
>
>
>On Monday, November 18, 2013 11:45 PM, DieterM75 . <die...@gm...> wrote:
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>
>>Thanks for your answers, I appreciate it!
>>
>>If you believe it or not, I have read every single page on the wiki and tried to understand the application pool and the service class. The thing is, most of it is written very minimalistic. And I can understand it, time is valuable. I am writing managed code for a living and I also want to learn, try things out and in the end understand the framework, but I sure get stuck without some input.
>>
>>For instance the handler code on page "Reload the application" cannot compile, because no return type is specified. Furthermore I had a look inside the application base class and there is no potential handler method that could be overridden. So how is it supposed to get called?
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>>
>>
>>Sincerely
>>
>>
>>
>>
>>On Mon, Nov 18, 2013 at 10:04 PM, Artyom Beilis <art...@ya...> wrote:
>>
>>> Well thanks for the really helpful reply (not).
>>>
>>>First of all, instead of being sarcastic I'd suggest you to read... manual pages about signal handling and understand how the code in wiki works and why, also read about cppcms::service::shutdown, read about the event loop in the wiki and so on.
>>>
>>>As I told you, your pattern is wrong, you should be based on the pattern in wiki.
>>>
>>>What is wrong:
>>>
>>>- wrong signal handler
>>>- wrong exception implementation
>>>- wrong assumption about how exceptions are handled... etc
>>>
>>>Instead reinventing the wheel, do as I told you in the previous mails, all you need to reset the application pointer when the srv.run() exits, before you restart the service.
>>>
>>>
>>>
>>>
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>>
>>
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>>
>
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