在自動加載實現完成後,接着new flightEngine()實例化了下框架的核心類Engine,這個類翻譯過來名字就是引擎發動機的意思,是flight的引擎發動機,很有想象力吧。
public static function app() {
static $initialized = false;
if (!$initialized) {
require_once __DIR__.'/autoload.php';
self::$engine = new \flight\Engine();
$initialized = true;
}
return self::$engine;
}
在實例化Engine這個類的時候,當前類的構造方法進行了對框架的初始化工作。
public function __construct() {
$this->vars = array();
$this->loader = new Loader();
$this->dispatcher = new Dispatcher();
$this->init();
}
接着來看init方法都做了什麼,將初始化狀態標記爲靜態變量static $initialized
,判斷如果爲true,將$this->vars
以及$this->loader
、$this->dispatcher
中保存的屬性重置爲默認狀態。
static $initialized = false;
$self = $this;
if ($initialized) {
$this->vars = array();
$this->loader->reset();
$this->dispatcher->reset();
}
接下來將框架的Request、Response、Router、View類的命定空間地址register(設置)到Loader類的classes屬性中。
// Register default components
$this->loader->register('request', '\flight\net\Request');
$this->loader->register('response', '\flight\net\Response');
$this->loader->register('router', '\flight\net\Router');
$this->loader->register('view', '\flight\template\View', array(), function($view) use ($self) {
$view->path = $self->get('flight.views.path');
$view->extension = $self->get('flight.views.extension');
});
Loader.php
public function register($name, $class, array $params = array(), $callback = null) {
unset($this->instances[$name]);
$this->classes[$name] = array($class, $params, $callback);
}
再接下來就是將框架給用戶提供的調用方法,設置到調度器Dispatcher類的events屬性中。
// Register framework methods
$methods = array(
'start','stop','route','halt','error','notFound',
'render','redirect','etag','lastModified','json','jsonp'
);
foreach ($methods as $name) {
$this->dispatcher->set($name, array($this, '_'.$name));
}
Dispatcher.php
/**
* Assigns a callback to an event.
*
* @param string $name Event name
* @param callback $callback Callback function
*/
public function set($name, $callback) {
$this->events[$name] = $callback;
}
接下來呢,就是設置框架的一些配置,將這些配置保存在Engine類的vars屬性中。
// Default configuration settings
$this->set('flight.base_url', null);
$this->set('flight.case_sensitive', false);
$this->set('flight.handle_errors', true);
$this->set('flight.log_errors', false);
$this->set('flight.views.path', './views');
$this->set('flight.views.extension', '.php');
Engine.php
/**
* Sets a variable.
*
* @param mixed $key Key
* @param string $value Value
*/
public function set($key, $value = null) {
if (is_array($key) || is_object($key)) {
foreach ($key as $k => $v) {
$this->vars[$k] = $v;
}
}
else {
$this->vars[$key] = $value;
}
}
最後一步的操作,當調用框架的start方法時,給其設置一些前置操作,通過set_error_handler()和set_exception_handler()設置用戶自定義的錯誤和異常處理函數,如何使用自定義的錯誤和異常函數,可以看這兩個範例:https://segmentfault.com/n/13...
https://segmentfault.com/n/13...。這些操作完成後,將$initialized = true
。
// Startup configuration
$this->before('start', function() use ($self) {
// Enable error handling
if ($self->get('flight.handle_errors')) {
set_error_handler(array($self, 'handleError'));
set_exception_handler(array($self, 'handleException'));
}
// Set case-sensitivity
$self->router()->case_sensitive = $self->get('flight.case_sensitive');
});
$initialized = true;
/**
* Custom error handler. Converts errors into exceptions.
*
* @param int $errno Error number
* @param int $errstr Error string
* @param int $errfile Error file name
* @param int $errline Error file line number
* @throws \ErrorException
*/
public function handleError($errno, $errstr, $errfile, $errline) {
if ($errno & error_reporting()) {
throw new \ErrorException($errstr, $errno, 0, $errfile, $errline);
}
}
/**
* Custom exception handler. Logs exceptions.
*
* @param \Exception $e Thrown exception
*/
public function handleException($e) {
if ($this->get('flight.log_errors')) {
error_log($e->getMessage());
}
$this->error($e);
}