141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
/*
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AppState - application initialisation and behaviour
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Copyright (C) Lumiera.org
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2008, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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#include "include/lifecycle.h"
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#include "lumiera/appstate.hpp"
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#include "lib/lifecycleregistry.hpp"
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#include "include/error.hpp"
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#include "common/util.hpp"
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using util::isnil;
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using util::cStr;
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namespace lumiera {
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Symbol ON_BASIC_INIT ("ON_BASIC_INIT");
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Symbol ON_GLOBAL_INIT ("ON_GLOBAL_INIT");
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Symbol ON_GLOBAL_SHUTDOWN ("ON_GLOBAL_SHUTDOWN");
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/** perform initialisation triggered on first access.
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* Will execute the ON_BASIC_INIT hook, but under typical
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* circumstances this is a NOP, because when callbacks are
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* added to this hook, the AppState singleton instance has
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* already been created. For this reason, there is special
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* treatment for the ON_BASIC_INIT in LifecycleHook::add,
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* causing the provided callbacks to be fired immediately.
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* (btw, this is nothing to be worried of, because from
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* client codes POV it just behaves like intended).
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*/
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AppState::AppState()
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: lifecycleHooks_(new LifecycleRegistry)
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{
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lifecycleHooks_->execute (ON_BASIC_INIT); // note in most cases a NOP
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}
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AppState::~AppState() { }
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AppState&
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AppState::instance() // Meyer's singleton
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{
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static scoped_ptr<AppState> theApp_ (0);
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if (!theApp_) theApp_.reset (new AppState ());
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return *theApp_;
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}
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void
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AppState::lifecycle (Symbol event_label)
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{
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instance().lifecycleHooks_->execute(event_label);
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}
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// ==== implementation LifecycleHook class =======
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typedef LifecycleRegistry::Hook Callback;
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LifecycleHook::LifecycleHook (Symbol eventLabel, Callback callbackFun)
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{
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add (eventLabel,callbackFun);
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}
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void
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LifecycleHook::add (Symbol eventLabel, Callback callbackFun)
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{
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bool isNew = AppState::instance().lifecycleHooks_->enroll (eventLabel,callbackFun);
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if (isNew && !strcmp(ON_BASIC_INIT, eventLabel))
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callbackFun(); // when this code executes,
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// then per definition we are already post "basic init"
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// (which happens in the AppState ctor); thus fire it immediately
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}
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void
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trigger (Symbol eventLabel)
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{
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AppState::lifecycle (eventLabel);
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}
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} // namespace lumiera
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extern "C" { /* ==== implementation C interface for lifecycle hooks ======= */
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extern const char * lumiera_ON_BASIC_INIT = lumiera::ON_BASIC_INIT;
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extern const char * lumiera_ON_GLOBAL_INIT = lumiera::ON_GLOBAL_INIT;
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extern const char * lumiera_ON_GLOBAL_SHUTDOWN = lumiera::ON_GLOBAL_SHUTDOWN;
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void
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lumiera_LifecycleHook_add (const char* eventLabel, void callbackFun(void))
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{
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lumiera::LifecycleHook (eventLabel, callbackFun);
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}
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void
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lumiera_Lifecycle_trigger (const char* eventLabel)
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{
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lumiera::AppState::lifecycle (eventLabel);
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}
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}
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