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source: code/archive/tutorial4/src/libraries/util/Scope.h @ 12329

Last change on this file since 12329 was 8858, checked in by landauf, 13 years ago

merged output branch back to trunk.

Changes:

  • you have to include util/Output.h instead of util/Debug.h
  • COUT(x) is now called orxout(level)
  • output levels are now defined by an enum instead of numbers. see util/Output.h for the definition
  • it's possible to use output contexts with orxout(level, context). see util/Output.h for some common contexts. you can define more contexts
  • you must use 'endl' at the end of an output message, '\n' does not flush the message

Output levels:

  • instead of COUT(0) use orxout()
  • instead of COUT(1) use orxout(user_error) or orxout(internal_error)
  • instead of COUT(2) use orxout(user_warning) or orxout(internal_warning)
  • instead of COUT(3) use orxout(user_status/user_info) or orxout(internal_status/internal_info)
  • instead of COUT(4) use orxout(verbose)
  • instead of COUT(5) use orxout(verbose_more)
  • instead of COUT(6) use orxout(verbose_ultra)

Guidelines:

  • user_* levels are for the user, visible in the console and the log-file
  • internal_* levels are for developers, visible in the log-file
  • verbose_* levels are for debugging, only visible if the context of the output is activated

Usage in C++:

  • orxout() << "message" << endl;
  • orxout(level) << "message" << endl;
  • orxout(level, context) << "message" << endl;

Usage in Lua:

  • orxout("message")
  • orxout(orxonox.level.levelname, "message")
  • orxout(orxonox.level.levelname, "context", "message")

Usage in Tcl (and in the in-game-console):

  • orxout levelname message
  • orxout_context levelname context message
  • shortcuts: log message, error message, warning message, status message, info message, debug message
  • Property svn:eol-style set to native
File size: 7.8 KB
Line 
1/*
2 *   ORXONOX - the hottest 3D action shooter ever to exist
3 *                    > www.orxonox.net <
4 *
5 *
6 *   License notice:
7 *
8 *   This program is free software; you can redistribute it and/or
9 *   modify it under the terms of the GNU General Public License
10 *   as published by the Free Software Foundation; either version 2
11 *   of the License, or (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21 *
22 *   Author:
23 *      Fabian 'x3n' Landau
24 *   Co-authors:
25 *      ...
26 *
27 */
28
29/**
30@file
31@ingroup SingletonScope
32@brief Declaration of the classes that are needed to use Scopes:
33orxonox::Scope, orxonox::ScopeListener, and orxonox::ScopeManager.
34
35@anchor Scope
36
37A virtual scope can be represented by an instance of class orxonox::Scope. orxonox::Scope<@a scope> is a template
38an its template argument defines the name of the virtual scope. See orxonox::ScopeID for an enumeration of the
39available values for @a scope. The orxonox::Scope object for a given @a scope can be activated or deactivated.
40Instances of orxonox::ScopeListener can register for a given @a scope and will get a notification if the
41corresponding orxonox::Scope object changes its state.
42
43To avoid multiple instances of orxonox::Scope<@a scope> in different libraries, each instance of orxonox::Scope
44registers in orxonox::ScopeManager, where they are linked statically in the util library.
45
46Scopes are usually used to control the creation and destruction of Singletons.
47
48@see orxonox::ScopedSingletonManager
49@see orxonox::Singleton
50*/
51
52#ifndef __Util_Scope_H__
53#define __Util_Scope_H__
54
55#include "UtilPrereqs.h"
56
57#include <cassert>
58#include <map>
59#include <set>
60#include <loki/ScopeGuard.h>
61
62#include "Output.h"
63
64namespace orxonox
65{
66    /**
67        @brief The ScopeManager stores the variables of the Scope templates in a statically linked context.
68
69        If all Scope objects are managed by this class, they are statically linked in the util library.
70        Without this, a new instance of Scope<T> for each T would be created in every library of Orxonox,
71        which is of course not the desired behavior.
72
73        @see See @ref Scope "this description" for details about the interrelationship of Scope, ScopeListener, and ScopeManager.
74    */
75    class _UtilExport ScopeManager
76    {
77        template <ScopeID::Value scope>
78        friend class Scope;
79        friend class ScopeListener;
80
81        private:
82            static std::map<ScopeID::Value, int> instanceCounts_s;                  //!< Counts the number of active instances (>0 means active) for a scope
83            static std::map<ScopeID::Value, std::set<ScopeListener*> > listeners_s; //!< Stores all listeners for a scope
84    };
85
86    /**
87        @brief ScopeListeners register themselves in the corresponding Scope and wait for notifications.
88        Notifications are sent if a Scope is activated or deactivated.
89
90        @see See @ref Scope "this description" for details about the interrelationship of Scope, ScopeListener, and ScopeManager.
91    */
92    class _UtilExport ScopeListener
93    {
94        template <ScopeID::Value scope>
95        friend class Scope;
96
97        protected:
98            //! Constructor: Registers the instance.
99            ScopeListener(ScopeID::Value scope) : scope_(scope), bActivated_(false)
100                { ScopeManager::listeners_s[this->scope_].insert(this); }
101            //! Destructor: Unregisters the instance.
102            virtual ~ScopeListener()
103                { ScopeManager::listeners_s[this->scope_].erase(this); }
104
105            //! Gets called if the scope is activated
106            virtual void activated() = 0;
107            //! Gets called if the scope is deactivated
108            virtual void deactivated() = 0;
109
110        private:
111            ScopeID::Value scope_; //!< Store the scope to unregister on destruction
112            bool bActivated_;
113    };
114
115    /**
116        @brief A scope for a given template argument is either active or not.
117
118        Objects inheriting from a ScopeListener are registered in a list (different for each scope).
119        If the scope gets activated or deactivated, all objects in this list are notified.
120
121        @see See @ref Scope "this description" for details about the interrelationship of Scope, ScopeListener, and ScopeManager.
122    */
123    template <ScopeID::Value scope>
124    class Scope
125    {
126        public:
127            //! Constructor: Increases the instance counter and activates the scope if the count went from 0 to 1. Counts >1 don't change anything.
128            Scope()
129            {
130                orxout(internal_status) << "creating scope... (" << scope << ")" << endl;
131
132                try
133                {
134                    ScopeManager::instanceCounts_s[scope]++;
135                    assert(ScopeManager::instanceCounts_s[scope] > 0);
136                    if (ScopeManager::instanceCounts_s[scope] == 1)
137                    {
138                        Loki::ScopeGuard deactivator = Loki::MakeObjGuard(*this, &Scope::deactivateListeners);
139                        for (typename std::set<ScopeListener*>::iterator it = ScopeManager::listeners_s[scope].begin(); it != ScopeManager::listeners_s[scope].end(); )
140                        {
141                            (*it)->activated();
142                            (*(it++))->bActivated_ = true;
143                        }
144                        deactivator.Dismiss();
145                    }
146                }
147                catch (...)
148                {
149                    ScopeManager::instanceCounts_s[scope]--;
150                    throw;
151                }
152
153                orxout(internal_status) << "created scope (" << scope << ")" << endl;
154            }
155
156            //! Destructor: Decreases the instance counter and deactivates the scope if the count went from 1 to 0. Counts >0 don't change anything.
157            ~Scope()
158            {
159                orxout(internal_status) << "destroying scope... (" << scope << ")" << endl;
160
161                ScopeManager::instanceCounts_s[scope]--;
162
163                // This shouldn't happen but just to be sure: check if the count is positive
164                assert(ScopeManager::instanceCounts_s[scope] >= 0);
165                if (ScopeManager::instanceCounts_s[scope] < 0)
166                    ScopeManager::instanceCounts_s[scope] = 0;
167
168                if (ScopeManager::instanceCounts_s[scope] == 0)
169                    this->deactivateListeners();
170
171                orxout(internal_status) << "destroyed scope (" << scope << ")" << endl;
172            }
173
174            //! Deactivates the listeners of this scope in case the scope is destroyed or the construction fails.
175            void deactivateListeners()
176            {
177                for (typename std::set<ScopeListener*>::iterator it = ScopeManager::listeners_s[scope].begin(); it != ScopeManager::listeners_s[scope].end(); )
178                {
179                    if ((*it)->bActivated_)
180                    {
181                        try
182                            { (*it)->deactivated(); }
183                        catch (...)
184                            { orxout(internal_warning) << "ScopeListener::deactivated() failed! This MUST NOT happen, fix it!" << endl; }
185                        (*(it++))->bActivated_ = false;
186                    }
187                    else
188                        ++it;
189                }
190            }
191
192            //! Returns true if the scope is active.
193            static bool isActive()
194            {
195                return (ScopeManager::instanceCounts_s[scope] > 0);
196            }
197    };
198}
199
200#endif /* __Util_Scope_H__ */
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