* {@link getErrorHandler errorHandler}: handles PHP errors and
* uncaught exceptions. This application component is dynamically loaded when needed.
* {@link getSecurityManager securityManager}: provides security-related
* services, such as hashing, encryption. This application component is dynamically
* loaded when needed.
* {@link getStatePersister statePersister}: provides global state
* persistence method. This application component is dynamically loaded when needed.
* {@link getCache cache}: provides caching feature. This application component is
* disabled by default.
* {@link getMessages messages}: provides the message source for translating
* application messages. This application component is dynamically loaded when needed.
* {@link getCoreMessages coreMessages}: provides the message source for translating
* Yii framework messages. This application component is dynamically loaded when needed.
*
*
* Application will undergo the following lifecycles when processing a user request:
*
* - load application configuration;
* - set up class autoloader and error handling;
* - load static application components;
* - {@link beforeRequest}: preprocess the user request; `beforeRequest` event raised.
* - {@link processRequest}: process the user request;
* - {@link afterRequest}: postprocess the user request; `afterRequest` event raised.
*
*
* Starting from lifecycle 3, if a PHP error or an uncaught exception occurs,
* the application will switch to its error handling logic and jump to step 6 afterwards.
*
* @property string $basePath Returns the root path of the application.
* @property CCache $cache Returns the cache component.
* @property CPhpMessageSource $coreMessages Returns the core message translations.
* @property CDateFormatter $dateFormatter Returns the locale-dependent date formatter.
* @property CDbConnection $db Returns the database connection component.
* @property CErrorHandler $errorHandler Returns the error handler component.
* @property string $extensionPath Returns the root directory that holds all third-party extensions.
* @property string $id Returns the unique identifier for the application.
* @property string $language Returns the language that the user is using and the application should be targeted to.
* @property CLocale $locale Returns the locale instance.
* @property string $localeDataPath Returns the directory that contains the locale data.
* @property CMessageSource $messages Returns the application message translations component.
* @property CNumberFormatter $numberFormatter The locale-dependent number formatter.
* @property CHttpRequest $request Returns the request component.
* @property string $runtimePath Returns the directory that stores runtime files.
* @property CSecurityManager $securityManager Returns the security manager component.
* @property CStatePersister $statePersister Returns the state persister component.
* @property string $timeZone Returns the time zone used by this application.
* @property CUrlManager $urlManager Returns the URL manager component.
* @property string $baseUrl Returns the relative URL for the application
* @property string $homeUrl the homepage URL
*
* @author Qiang Xue
* @since 2.0
*/
class Application extends Module
{
/**
* @var string the application name. Defaults to 'My Application'.
*/
public $name = 'My Application';
/**
* @var string the charset currently used for the application. Defaults to 'UTF-8'.
*/
public $charset = 'UTF-8';
/**
* @var string the language that the application is written in. This mainly refers to
* the language that the messages and view files are in. Defaults to 'en_us' (US English).
* @see language
*/
public $sourceLanguage = 'en_us';
/**
* @var array IDs of application components that need to be loaded when the application starts.
* The default value is `array('errorHandler')`, which loads the [[errorHandler]] component
* to ensure errors and exceptions can be handled nicely.
*/
public $preload = array('errorHandler');
public $localeDataPath = '@yii/i18n/data';
private $_runtimePath;
private $_ended = false;
private $_language;
/**
* Constructor.
* @param string $id the ID of this application. The ID should uniquely identify the application from others.
* @param string $basePath the base path of this application. This should point to
* the directory containing all application logic, template and data.
*/
public function __construct($id, $basePath)
{
\Yii::$application = $this;
$this->id = $id;
$this->setBasePath($basePath);
\Yii::setAlias('application', $this->getBasePath());
$this->registerCoreComponents();
}
/**
* Initializes the module.
* This method is called after the module is created and initialized with property values
* given in configuration.
*/
public function init()
{
$this->preloadComponents();
}
/**
* Runs the application.
* This method loads static application components. Derived classes usually overrides this
* method to do more application-specific tasks.
* Remember to call the parent implementation so that static application components are loaded.
*/
public function run()
{
$this->beforeRequest();
$this->processRequest();
$this->afterRequest();
}
/**
* Terminates the application.
* This method replaces PHP's exit() function by calling [[afterRequest()]] before exiting.
* @param integer $status exit status (value 0 means normal exit while other values mean abnormal exit).
* @param boolean $exit whether to exit the current request.
* It defaults to true, meaning the PHP's exit() function will be called at the end of this method.
*/
public function end($status = 0, $exit = true)
{
if (!$this->_ended) {
$this->_ended = true;
$this->afterRequest();
}
if ($exit) {
exit($status);
}
}
/**
* Raises the [[beforeRequest]] event right BEFORE the application processes the request.
*/
public function beforeRequest()
{
$this->trigger('beforeRequest');
}
/**
* Processes the request.
* This is the place where the actual request processing work is done.
* Derived classes should override this method.
*/
public function processRequest()
{
}
/**
* Raises the [[afterRequest]] event right AFTER the application processes the request.
*/
public function afterRequest()
{
$this->trigger('afterRequest');
}
/**
* Returns the directory that stores runtime files.
* @return string the directory that stores runtime files. Defaults to 'protected/runtime'.
*/
public function getRuntimePath()
{
if ($this->_runtimePath !== null) {
return $this->_runtimePath;
} else {
$this->setRuntimePath($this->getBasePath() . DIRECTORY_SEPARATOR . 'runtime');
return $this->_runtimePath;
}
}
/**
* Sets the directory that stores runtime files.
* @param string $path the directory that stores runtime files.
* @throws Exception if the directory does not exist or is not writable
*/
public function setRuntimePath($path)
{
if (!is_dir($path) || !is_writable($path)) {
throw new \yii\base\Exception("Application runtime path \"$path\" is invalid. Please make sure it is a directory writable by the Web server process.");
}
$this->_runtimePath = $path;
}
/**
* Returns the language that the end user is using.
* @return string the language that the user is using (e.g. 'en_US', 'zh_CN').
* Defaults to the value of [[sourceLanguage]].
*/
public function getLanguage()
{
return $this->_language === null ? $this->sourceLanguage : $this->_language;
}
/**
* Specifies which language the end user is using.
* This is the language that the application should use to display to end users.
* By default, [[language]] and [[sourceLanguage]] are the same.
* Do not set this property unless your application needs to support multiple languages.
* @param string $language the user language (e.g. 'en_US', 'zh_CN').
* If it is null, the {@link sourceLanguage} will be used.
*/
public function setLanguage($language)
{
$this->_language = $language;
}
/**
* Returns the time zone used by this application.
* This is a simple wrapper of PHP function date_default_timezone_get().
* @return string the time zone used by this application.
* @see http://php.net/manual/en/function.date-default-timezone-get.php
*/
public function getTimeZone()
{
return date_default_timezone_get();
}
/**
* Sets the time zone used by this application.
* This is a simple wrapper of PHP function date_default_timezone_set().
* @param string $value the time zone used by this application.
* @see http://php.net/manual/en/function.date-default-timezone-set.php
*/
public function setTimeZone($value)
{
date_default_timezone_set($value);
}
/**
* Returns the localized version of a specified file.
*
* The searching is based on the specified language code. In particular,
* a file with the same name will be looked for under the subdirectory
* named as the locale ID. For example, given the file "path/to/view.php"
* and locale ID "zh_cn", the localized file will be looked for as
* "path/to/zh_cn/view.php". If the file is not found, the original file
* will be returned.
*
* For consistency, it is recommended that the locale ID is given
* in lower case and in the format of LanguageID_RegionID (e.g. "en_us").
*
* @param string $srcFile the original file
* @param string $srcLanguage the language that the original file is in. If null, the application {@link sourceLanguage source language} is used.
* @param string $language the desired language that the file should be localized to. If null, the {@link getLanguage application language} will be used.
* @return string the matching localized file. The original file is returned if no localized version is found
* or if source language is the same as the desired language.
*/
public function findLocalizedFile($srcFile, $srcLanguage = null, $language = null)
{
if ($srcLanguage === null) {
$srcLanguage = $this->sourceLanguage;
}
if ($language === null) {
$language = $this->getLanguage();
}
if ($language === $srcLanguage) {
return $srcFile;
}
$desiredFile = dirname($srcFile) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($srcFile);
return is_file($desiredFile) ? $desiredFile : $srcFile;
}
/**
* Returns the locale instance.
* @param string $localeID the locale ID (e.g. en_US). If null, the {@link getLanguage application language ID} will be used.
* @return CLocale the locale instance
*/
public function getLocale($localeID = null)
{
return CLocale::getInstance($localeID === null ? $this->getLanguage() : $localeID);
}
/**
* @return CNumberFormatter the locale-dependent number formatter.
* The current {@link getLocale application locale} will be used.
*/
public function getNumberFormatter()
{
return $this->getLocale()->getNumberFormatter();
}
/**
* Returns the locale-dependent date formatter.
* @return CDateFormatter the locale-dependent date formatter.
* The current {@link getLocale application locale} will be used.
*/
public function getDateFormatter()
{
return $this->getLocale()->getDateFormatter();
}
/**
* Returns the database connection component.
* @return \yii\db\dao\Connection the database connection
*/
public function getDb()
{
return $this->getComponent('db');
}
/**
* Returns the error handler component.
* @return ErrorHandler the error handler application component.
*/
public function getErrorHandler()
{
return $this->getComponent('errorHandler');
}
/**
* Returns the security manager component.
* @return SecurityManager the security manager application component.
*/
public function getSecurityManager()
{
return $this->getComponent('securityManager');
}
/**
* Returns the state persister component.
* @return CStatePersister the state persister application component.
*/
public function getStatePersister()
{
return $this->getComponent('statePersister');
}
/**
* Returns the cache component.
* @return \yii\caching\Cache the cache application component. Null if the component is not enabled.
*/
public function getCache()
{
return $this->getComponent('cache');
}
/**
* Returns the core message translations component.
* @return \yii\i18n\MessageSource the core message translations
*/
public function getCoreMessages()
{
return $this->getComponent('coreMessages');
}
/**
* Returns the application message translations component.
* @return \yii\i18n\MessageSource the application message translations
*/
public function getMessages()
{
return $this->getComponent('messages');
}
/**
* Returns the request component.
* @return Request the request component
*/
public function getRequest()
{
return $this->getComponent('request');
}
/**
* Registers the core application components.
* @see setComponents
*/
public function registerCoreComponents()
{
$this->setComponents(array(
'errorHandler' => array(
'class' => 'yii\base\ErrorHandler',
),
'request' => array(
'class' => 'yii\base\Request',
),
'response' => array(
'class' => 'yii\base\Response',
),
'format' => array(
'class' => 'yii\base\Formatter',
),
'coreMessages' => array(
'class' => 'yii\i18n\PhpMessageSource',
'language' => 'en_us',
'basePath' => '@yii/messages',
),
'messages' => array(
'class' => 'yii\i18n\PhpMessageSource',
),
'securityManager' => array(
'class' => 'yii\base\SecurityManager',
),
'statePersister' => array(
'class' => 'yii\base\StatePersister',
),
));
}
}