Re: [Cppcms-users] Consumer producer problem

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

> 

> [...]
> In the end it looks like I have a one process <----> one browser session
> connection.
> 

> [...]
> --
> Christian Gmeiner, MSc


So why not just use?

   // disable gzip to allow transparent flush
   response().io_mode(nogzip);
   // something like that not remember exactly the content type and API
   response().content_type("text/event-stream");


   while(get_some_input_from_process()!=EOF) {

     sse::write_event(response().out(),id,data);

     response().out() << std::flush;
   }

 
Of course there is no way to reconnect and see what happens if you closed
the session...

Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/


>> 
>>  However if you have many clients and one source it is
>>  a different problem.
>> 
>>  What happens if somebody requests the date after the process
>>  started do you send it from the begging or from the last
>>  event? What happens on reconnect you need to start from the
>>  last point but how long do you want to keep the data?
>> 
>>  In general you can keep all events - all the output
>> 
>>  and send it from the beginning, in such case you can either
>>  make the ring buffer with a big ring or just alter
>>  the class
>> 
>> 
> http://sourceforge.net/p/cppcms/code/2238/tree/framework/trunk/contrib/server_side/sse/server_sent_events.h
>> 
>> 
>>  With the policy you need. You can derive the event_source
>>  class and provide the policy of keeping and throwing messages
>>  the way you need.
>> 
> 
> As far as I have seen the broadcast() method in the event_source class
> works asynchronously. So I need
> to change it to be synchronously.
> 
> 
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