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scheduler.cpp
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scheduler.cpp
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/** @file scheduler.cpp Script scheduling utility.
*
* @authors Copyright (c) 2015 Jaakko Keränen <jaakko.keranen@iki.fi>
*
* @par License
* LGPL: http://www.gnu.org/licenses/lgpl.html
*
* <small>This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at your
* option) any later version. This program is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details. You should have received a copy of
* the GNU Lesser General Public License along with this program; if not, see:
* http://www.gnu.org/licenses</small>
*/
#include "de/Scheduler"
#include "de/ScriptedInfo"
#include "de/Record"
#include "de/Script"
#include "de/Process"
#include <queue>
#include <deque>
namespace de {
DENG2_PIMPL(Scheduler)
, DENG2_OBSERVES(Record, Deletion)
{
Record *context = nullptr;
struct Event {
TimeDelta at;
Script script;
Event(TimeDelta at, String const &source, String const &sourcePath)
: at(at)
, script(source)
{
script.setPath(sourcePath); // where the source comes from
}
struct Compare {
bool operator () (Event const *a, Event const *b) { return a->at > b->at; }
};
};
typedef std::priority_queue<Event *, std::deque<Event *>, Event::Compare> Events;
Events events;
Instance(Public *i) : Base(i)
{}
~Instance()
{
setContext(nullptr);
clear();
}
void clear()
{
while(!events.empty())
{
delete events.top();
events.pop();
}
}
void setContext(Record *rec)
{
if(context) context->audienceForDeletion() -= this;
context = rec;
if(context) context->audienceForDeletion() += this;
}
void recordBeingDeleted(Record &record)
{
if(context == &record)
{
context = nullptr;
}
}
};
Scheduler::Scheduler()
: d(new Instance(this))
{}
void Scheduler::clear()
{
d->clear();
}
void Scheduler::setContext(Record &context)
{
d->setContext(&context);
}
Script &Scheduler::addScript(TimeDelta at, String const &source, String const &sourcePath)
{
auto *ev = new Instance::Event(at, source, sourcePath);
d->events.push(ev);
return ev->script;
}
void Scheduler::addFromInfo(Record const &timelineRecord)
{
auto scripts = ScriptedInfo::subrecordsOfType(ScriptedInfo::SCRIPT, timelineRecord);
for(String key : ScriptedInfo::sortRecordsBySource(scripts))
{
auto const &def = *scripts[key];
try
{
addScript(def.getd("at", 0.0),
def.gets(ScriptedInfo::SCRIPT),
ScriptedInfo::sourceLocation(def));
}
catch(Error const &er)
{
LOG_RES_ERROR("%s: Error in timeline script: %s")
<< ScriptedInfo::sourceLocation(def)
<< er.asText();
}
}
}
//----------------------------------------------------------------------------
DENG2_PIMPL_NOREF(Scheduler::Clock)
{
typedef Scheduler::Instance::Event Event;
typedef Scheduler::Instance::Events Events; // Events not owned
Record *context = nullptr;
Scheduler const *scheduler = nullptr;
TimeDelta at = 0.0;
Events events;
void rewind(TimeDelta const &toTime)
{
at = toTime;
// Restore events into the queue.
events = scheduler->d->events;
while(!events.empty())
{
if(events.top()->at < at)
{
events.pop();
}
else break;
}
}
void advanceTime(TimeDelta const &elapsed)
{
at += elapsed;
while(!events.empty())
{
Event const *ev = events.top();
if(ev->at > at) break;
events.pop();
// Execute the script in the specified context.
Process process(context? context : scheduler->d->context);
process.run(ev->script);
process.execute();
}
}
};
Scheduler::Clock::Clock(Scheduler const &schedule, Record *context)
: d(new Instance)
{
d->scheduler = &schedule;
d->context = context;
d->rewind(0.0);
}
TimeDelta Scheduler::Clock::at() const
{
return d->at;
}
void Scheduler::Clock::rewind(TimeDelta const &toTime)
{
d->rewind(toTime);
}
void Scheduler::Clock::advanceTime(TimeDelta const &elapsed)
{
d->advanceTime(elapsed);
}
bool Scheduler::Clock::isFinished() const
{
return d->events.empty();
}
} // namespace de