Laravel中schedule调度的运行机制

// namespace \Illuminate\Console\Scheduling\Schedule

public function command($command, array $parameters = [])
{
    if (class_exists($command)) {
        $command = Container::getInstance()->make($command)->getName();
    }

    return $this->exec(
        Application::formatCommandString($command), $parameters
    );
}

public function exec($command, array $parameters = [])
{
    if (count($parameters)) {
        $command .= ' '.$this->compileParameters($parameters);
    }

    $this->events[] = $event = new Event($this->eventMutex, $command, $this->timezone);

    return $event;
}

// namespace \Illuminate\Console\Scheduling\Event
protected function runCommandInForeground(Container $container)
{
    $this->callBeforeCallbacks($container);

    $this->exitCode = Process::fromShellCommandline($this->buildCommand(), base_path(), null, null, null)->run();

    $this->callAfterCallbacks($container);
}

protected function runCommandInBackground(Container $container)
{
    $this->callBeforeCallbacks($container);

    Process::fromShellCommandline($this->buildCommand(), base_path(), null, null, null)->run();
}

public function buildCommand()
{
    return (new CommandBuilder)->buildCommand($this);
}

// namespace Illuminate\Console\Scheduling\CommandBuilder
public function buildCommand(Event $event)
{
    if ($event->runInBackground) {
        return $this->buildBackgroundCommand($event);
    }

    return $this->buildForegroundCommand($event);
}

protected function buildForegroundCommand(Event $event)
{
    $output = ProcessUtils::escapeArgument($event->output);

    return $this->ensureCorrectUser(
        $event, $event->command.($event->shouldAppendOutput ? ' >> ' : ' > ').$output.' 2>&1'
    );
}

protected function buildBackgroundCommand(Event $event)
{
    $output = ProcessUtils::escapeArgument($event->output);

    $redirect = $event->shouldAppendOutput ? ' >> ' : ' > ';

    $finished = Application::formatCommandString('schedule:finish').' "'.$event->mutexName().'"';

    if (windows_os()) {
        return 'start /b cmd /c "('.$event->command.' & '.$finished.' "%errorlevel%")'.$redirect.$output.' 2>&1"';
    }

    return $this->ensureCorrectUser($event,
        '('.$event->command.$redirect.$output.' 2>&1 ; '.$finished.' "$?") > '
        .ProcessUtils::escapeArgument($event->getDefaultOutput()).' 2>&1 &'
    );
}

// namespace Illuminate\Console\Scheduling\Event
public function withoutOverlapping($expiresAt = 1440)
{
    $this->withoutOverlapping = true;

    $this->expiresAt = $expiresAt;

    return $this->then(function () {
        $this->mutex->forget($this);
    })->skip(function () {
        return $this->mutex->exists($this);
    });
}

public function run(Container $container)
{
    if ($this->withoutOverlapping &&
        ! $this->mutex->create($this)) {
        return;
    }

    $this->runInBackground
                ? $this->runCommandInBackground($container)
                : $this->runCommandInForeground($container);
}

// namespace \Illuminate\Console\Scheduling\Schedule
$this->eventMutex = $container->bound(EventMutex::class)
                                ? $container->make(EventMutex::class)
                                : $container->make(CacheEventMutex::class);

// namespace \Illuminate\Foundation\Console\Kernel
protected function defineConsoleSchedule()
{
    $this->app->singleton(Schedule::class, function ($app) {
        return tap(new Schedule($this->scheduleTimezone()), function ($schedule) {
            $this->schedule($schedule->useCache($this->scheduleCache()));
        });
    });
}

protected function scheduleCache()
{
    return Env::get('SCHEDULE_CACHE_DRIVER');
}

// namespace \Illuminate\Console\Scheduling\Schedule
public function useCache($store)
{
    if ($this->eventMutex instanceof CacheEventMutex) {
        $this->eventMutex->useStore($store);
    }

    /* ... ... */
    return $this;
}

// namespace \Illuminate\Console\Scheduling\CacheEventMutex
public function create(Event $event)
{
    return $this->cache->store($this->store)->add(
        $event->mutexName(), true, $event->expiresAt * 60
    );
}

// namespace \Illuminate\Cache\CacheManager
public function store($name = null)
{
    $name = $name ?: $this->getDefaultDriver();

    return $this->stores[$name] = $this->get($name);
}

public function getDefaultDriver()
{
    return $this->app['config']['cache.default'];
}

protected function get($name)
{
    return $this->stores[$name] ?? $this->resolve($name);
}

protected function resolve($name)
{
    $config = $this->getConfig($name);

    if (is_null($config)) {
        throw new InvalidArgumentException("Cache store [{$name}] is not defined.");
    }

    if (isset($this->customCreators[$config['driver']])) {
        return $this->callCustomCreator($config);
    } else {
        $driverMethod = 'create'.ucfirst($config['driver']).'Driver';

        if (method_exists($this, $driverMethod)) {
            return $this->{$driverMethod}($config);
        } else {
            throw new InvalidArgumentException("Driver [{$config['driver']}] is not supported.");
        }
    }
}

protected function getConfig($name)
{
    return $this->app['config']["cache.stores.{$name}"];
}

protected function createFileDriver(array $config)
{
    return $this->repository(new FileStore($this->app['files'], $config['path'], $config['permission'] ?? null));
}

// namespace \Illuminate\Cache\Repository
public function add($key, $value, $ttl = null)
{
    if ($ttl !== null) {
        if ($this->getSeconds($ttl) <= 0) {
            return false;
        }

        if (method_exists($this->store, 'add')) {
            $seconds = $this->getSeconds($ttl);

            return $this->store->add(
                $this->itemKey($key), $value, $seconds
            );
        }
    }

    if (is_null($this->get($key))) {
        return $this->put($key, $value, $ttl);
    }

    return false;
}

public function get($key, $default = null)
{
    if (is_array($key)) {
        return $this->many($key);
    }

    $value = $this->store->get($this->itemKey($key));

    if (is_null($value)) {
        $this->event(new CacheMissed($key));

        $value = value($default);
    } else {
        $this->event(new CacheHit($key, $value));
    }

    return $value;
}

// namespace \Illuminate\Cache\FileStore
public function get($key)
{
    return $this->getPayload($key)['data'] ?? null;
}

protected function getPayload($key)
{
    $path = $this->path($key);

    try {
        $expire = substr(
            $contents = $this->files->get($path, true), 0, 10
        );
    } catch (Exception $e) {
        return $this->emptyPayload();
    }

    if ($this->currentTime() >= $expire) {
        $this->forget($key);

        return $this->emptyPayload();
    }

    try {
        $data = unserialize(substr($contents, 10));
    } catch (Exception $e) {
        $this->forget($key);

        return $this->emptyPayload();
    }

    $time = $expire - $this->currentTime();

    return compact('data', 'time');
}

// namespace \Illuminate\Cache\Repository
public function put($key, $value, $ttl = null)
{
    /* ... ... */

    $seconds = $this->getSeconds($ttl);

    if ($seconds <= 0) {
        return $this->forget($key);
    }

    $result = $this->store->put($this->itemKey($key), $value, $seconds);

    if ($result) {
        $this->event(new KeyWritten($key, $value, $seconds));
    }

    return $result;
}

// namespace \Illuminate\Cache\FileStore
public function put($key, $value, $seconds)
{
    $this->ensureCacheDirectoryExists($path = $this->path($key));

    $result = $this->files->put(
        $path, $this->expiration($seconds).serialize($value), true
    );

    if ($result !== false && $result > 0) {
        $this->ensureFileHasCorrectPermissions($path);

        return true;
    }

    return false;
}

protected function path($key)
{
    $parts = array_slice(str_split($hash = sha1($key), 2), 0, 2);

    return $this->directory.'/'.implode('/', $parts).'/'.$hash;
}

// namespace \Illuminate\Console\Scheduling\Schedule
public function mutexName()
{
    return 'framework'.DIRECTORY_SEPARATOR.'schedule-'.sha1($this->expression.$this->command);
}

// namespace \Illuminate\Console\Scheduling\ScheduleRunCommand
public function handle(Schedule $schedule, Dispatcher $dispatcher)
{
    $this->schedule = $schedule;
    $this->dispatcher = $dispatcher;

    foreach ($this->schedule->dueEvents($this->laravel) as $event) {
        if (! $event->filtersPass($this->laravel)) {
            $this->dispatcher->dispatch(new ScheduledTaskSkipped($event));

            continue;
        }

        if ($event->onOneServer) {
            $this->runSingleServerEvent($event);
        } else {
            $this->runEvent($event);
        }

        $this->eventsRan = true;
    }

    if (! $this->eventsRan) {
        $this->info('No scheduled commands are ready to run.');
    }
}

// namespace \Illuminate\Console\Scheduling\Schedule
public function dueEvents($app)
{
    return collect($this->events)->filter->isDue($app);
}

// namespace \Illuminate\Console\Scheduling\Event
public function isDue($app)
{
    /* ... ... */
    return $this->expressionPasses() &&
           $this->runsInEnvironment($app->environment());
}

protected function expressionPasses()
{
    $date = Carbon::now();
    /* ... ... */
    return CronExpression::factory($this->expression)->isDue($date->toDateTimeString());
}

// namespace \Cron\CronExpression
public function isDue($currentTime = 'now', $timeZone = null)
{
   /* ... ... */
   
    try {
        return $this->getNextRunDate($currentTime, 0, true)->getTimestamp() === $currentTime->getTimestamp();
    } catch (Exception $e) {
        return false;
    }
}

public function getNextRunDate($currentTime = 'now', $nth = 0, $allowCurrentDate = false, $timeZone = null)
{
    return $this->getRunDate($currentTime, $nth, false, $allowCurrentDate, $timeZone);
}