Streamline application class registration

[libs/core.git] / source / core / application.cpp

diff --git a/source/core/application.cpp b/source/core/application.cpp
index 47c176bd8a882a6869df467e7330f2274bfcc5e4..a588e9dbb7900cff2b3d15a200f41a9be2382d8f 100644 (file)
--- a/source/core/application.cpp
+++ b/source/core/application.cpp
@@ -1,20 +1,28 @@
 /* $Id$
 
 This file is part of libmspcore
-Copyright © 2006 Mikko Rasa, Mikkosoft Productions
+Copyright © 2006-2008, 2011  Mikko Rasa, Mikkosoft Productions
 Distributed under the LGPL
 */
+
 #include <signal.h>
 #include <iostream>
+#include <typeinfo>
+#include "../debug/backtrace.h"
+#include "../debug/demangle.h"
 #include "../time/units.h"
 #include "../time/utils.h"
 #include "application.h"
-#include "error.h"
+#include "except.h"
 
 using namespace std;
 
 namespace Msp {
 
+Application::Application():
+       exit_code(0)
+{ }
+
 /**
 Constructs an instance of the registered application class and runs it.  If the
 application throws a UsageError, the static usage() function is called.
@@ -22,7 +30,7 @@ application throws a UsageError, the static usage() function is called.
 This function can only be called once.  The global main() function provided by
 the library normally does it automatically at program startup.
 */
-int Application::run(int argc, char **argv)
+int Application::run(int argc, char **argv, void *data)
 {
        static bool called=false;
        if(called)
@@ -32,21 +40,23 @@ int Application::run(int argc, char **argv)
        }
        called=true;
 
-       if(!reg_app_)
+       if(!starter_)
        {
-               cerr<<"Trying to run with no application class registered!\n";
+               cerr<<"Trying to run with no RegisteredApplication class!\n";
                return 126;
        }
 
+       data_=data;
+
        try
        {
                try
                {
-                       app_=reg_app_->create_app(argc, argv);
+                       app_=starter_->create_app(argc, argv);
                }
                catch(const UsageError &e)
                {
-                       reg_app_->usage(e.what(), argv[0], e.get_brief());
+                       starter_->usage(e.what(), argv[0], e.get_brief());
                        return 1;
                }
 
@@ -56,11 +66,27 @@ int Application::run(int argc, char **argv)
        }
        catch(const exception &e)
        {
+               delete app_;
+
+#ifdef WIN32
+               string msg=Debug::demangle(typeid(e).name())+":\n"+e.what();
+               MessageBoxA(0, msg.c_str(), "Uncaught exception", MB_OK|MB_ICONERROR);
+#else
                cerr<<"An uncaught exception occurred.\n";
-               cerr<<"  type:   "<<typeid(e).name()<<'\n';
+               cerr<<"  type:   "<<Debug::demangle(typeid(e).name())<<'\n';
                cerr<<"  what(): "<<e.what()<<'\n';
-               delete app_;
-               throw;
+
+               const Exception *exc=dynamic_cast<const Exception *>(&e);
+               if(exc && !exc->get_backtrace().get_frames().empty())
+               {
+                       cerr<<"  backtrace:\n";
+                       const list<Debug::Backtrace::StackFrame> &frames=exc->get_backtrace().get_frames();
+                       for(list<Debug::Backtrace::StackFrame>::const_iterator i=frames.begin(); i!=frames.end(); ++i)
+                               cerr<<"    "<<*i<<'\n';
+               }
+#endif
+
+               return 124;
        }
 }
 
@@ -79,44 +105,15 @@ void Application::usage(const char *reason, const char *, bool)
        cerr<<"The programmer was lazy and didn't write a usage() function for this application.\n";
 }
 
-Application::Application():
-       exit_code(0),
-       loop_mode_(TICK_SLEEP)
-{ }
-
 /**
-Default main loop.  Behavior depends on loop_mode_.  A custom main loop should
-monitor the done member variable and return exit_code.
+Default main loop.  Calls tick() repeatedly until exit() is called.  A custom
+main loop should monitor the done member variable and return exit_code.
 */
 int Application::main()
 {
-       if(loop_mode_==NONE)
-               return 0;
-
-       done=false;
+       done = false;
        while(!done)
-       {
-               if(loop_mode_==SLEEP)
-               {
-                       sleep_sem_.wait();
-                       if(!done)
-                               tick();
-               }
-               else if(loop_mode_==TICK_SLEEP)
-               {
-                       tick();
-                       Time::sleep(Time::msec);
-               }
-               else if(loop_mode_==TICK_YIELD)
-               {
-                       tick();
-#ifdef WIN32
-                       Sleep(0);
-#else
-                       sched_yield();
-#endif
-               }
-       }
+               tick();
 
        return exit_code;
 }
@@ -129,36 +126,13 @@ void Application::catch_signal(int s)
        signal(s, &sighandler_);
 }
 
-/**
-Changes the main loop mode.
-*/
-void Application::set_loop_mode(LoopMode l)
-{
-       LoopMode old_mode=loop_mode_;
-       loop_mode_=l;
-       if(old_mode==SLEEP)
-               sleep_sem_.signal();
-}
-
-/**
-Causes the tick() function to be executed once if loop mode is SLEEP.  Has no
-effect with other loop modes.
-*/
-void Application::induce_tick()
-{
-       if(loop_mode_==SLEEP)
-               sleep_sem_.signal();
-}
-
 /**
 Causes the application to exit gracefully with the given exit code.
 */
 void Application::exit(int c)
 {
-       done=true;
-       exit_code=c;
-       if(loop_mode_==SLEEP)
-               sleep_sem_.signal();
+       done = true;
+       exit_code = c;
 }
 
 /**
@@ -169,18 +143,17 @@ void Application::sighandler_(int s)
        app_->sighandler(s);
 }
 
-Application::RegBase::RegBase()
+
+Application::Starter::Starter()
 {
-       if(reg_app_)
-       {
-               cerr<<"Warning: registering the application twice\n";
-               delete reg_app_;
-       }
+       if(starter_)
+               throw InvalidState("Can't create more than one Starter instance");
 
-       reg_app_=this;
+       starter_=this;
 }
 
 Application *Application::app_=0;
 Application::RegBase *Application::reg_app_=0;
+void *Application::data_=0;
 
 } // namespace Msp