Re: [Cppcms-users] comet question

[Artyom <art...@ya...>]

Hi,

I've tested your code and it mostly works.

Also I don't see any "Access to unassigned context" errors

The only problem is that you need to add "response().finalize();" before calling
async_complete_response() in case you do not write anything to output (i.e. not 
accessed to out())

I've updated the blog post. 

About unassigned context 

- what version of CppCMS are you using.
- In what case it happens (which URL is accessed and in what method)?

This exception is thrown in case you try to use any request/response related 
information
after calling release_context(), do you call any functions after 
release_context()
In what location the exception is thrown?

Artyom

See where to add finalize() in the code below.


> 
> i try to build the example from the  blogpost
> 
> http://art-blog.no-ip.info/cppcms/blog/post/47
> 
> and i'm  kind of stuck. the example seems not to be really compatible
> with the current  cppcms version. i adapted the source as follows:
> 
> class lpTest : public  cppcms::application {
> public:
>   lpTest(cppcms::service &srv)  :
>     cppcms::application(srv) {
> 
>      dispatcher().assign("^/postMessage$",
>                          &lpTest::postMessage,  this);
>      dispatcher().assign("^/consumeMessage/(\\d+)$",
>                           &lpTest::consumeMessage, this, 1);
>   }
> 
>   void  postMessage() {
>     if(request().request_method() == "POST")  {
>       if(request().post().find("message") !=  request().post().end()) {
>          messages.push_back(request().post().find("message")->second);
>          broadcast();
>       }
>      }
> 

NEED response().finalize() THERE

>      release_context()->async_complete_response();
>   }
> 
>   void  consumeMessage(std::string id) {
>     unsigned pos =  atoi(id.c_str());
> 
>     if(pos < messages.size()) {
>        response().set_plain_text_header();
>        response().out() << messages[pos];
>        release_context()->async_complete_response();
>     } else if(pos  == messages.size()) {
>        waiters.push_back(release_context());
>     } else {
>        response().status(404);

NEED response().finalize() THERE

>        release_context()->async_complete_response();
>     }
>    }
> 
>   void broadcast() {
>     // send the message to all  waiters
>     for(unsigned i=0; i<waiters.size(); i++) {
>        waiters[i]->response().set_plain_text_header();
>        waiters[i]->response().out() <<  messages.back();
>        waiters[i]->async_complete_response();
>     }
> 
>      waiters.clear();
>   }
> 
> private:
>    std::vector<std::string> messages;
>    std::vector<booster::shared_ptr<cppcms::http::context> >  waiters;
> };
> 
> and for main:
> 
>   cppcms::service srv(argc,  argv);
>   booster::intrusive_ptr<lpTest> app = new  lpTest(srv);
>   srv.applications_pool().mount(app);
>    srv.run();
> 
> as far as i understand this should work. my problem is that if  i start
> the application and do a request it gives me the following  exception:
> 
> Catched excepion [Access to unassigned context]  (.../http_context.cpp:144)
> 
> it seems like the framework tries to do  something with the context
> though it has been released by release_context() -  what am i  missing?
> 
> frank
> 
> 
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