Note that this method will also check all parent classes to see if there is any handler attached
to the named event.
public function test_MigrationEvent()
{
try {
$this->cleanDb();
$this->mockYiiApplication();
\Yii::$app->mycfg->system->version = null;
// to trigger migration event
$bootstrap = new MyLibraryBootstrap();
$bootstrap->bootstrap(\Yii::$app);
$this->assertTrue(\yii\base\Event::hasHandlers(\app\components\Controller::class, \app\components\Controller::EVENT_BEFORE_ACTION), 'migration event for controller was not added');
} finally {
$this->resetConnection();
}
}
public function testHasHandlers()
{
$this->assertFalse(Event::hasHandlers(Post::className(), 'save'));
$this->assertFalse(Event::hasHandlers(ActiveRecord::className(), 'save'));
Event::on(Post::className(), 'save', function ($event) {
$this->counter += 1;
});
$this->assertTrue(Event::hasHandlers(Post::className(), 'save'));
$this->assertFalse(Event::hasHandlers(ActiveRecord::className(), 'save'));
$this->assertFalse(Event::hasHandlers(User::className(), 'save'));
Event::on(ActiveRecord::className(), 'save', function ($event) {
$this->counter += 1;
});
$this->assertTrue(Event::hasHandlers(User::className(), 'save'));
$this->assertTrue(Event::hasHandlers(ActiveRecord::className(), 'save'));
}
/**
* Returns a value indicating whether there is any handler attached to the named event.
* @param string $name the event name
* @return boolean whether there is any handler attached to the event.
*/
public function hasEventHandlers($name)
{
$this->ensureBehaviors();
return !empty($this->_events[$name]) || Event::hasHandlers($this, $name);
}
/**
* Returns a value indicating whether there is any handler attached to the named event.
*
* 判断 _events 中的一个 event 是否具有 handler
* @param string $name the event name
* @return boolean whether there is any handler attached to the event.
*/
public function hasEventHandlers($name)
{
$this->ensureBehaviors();
// _events 中存在 $name 的 event 或者 $name 的 event 是否含有该对象所在的类的 handler
return !empty($this->_events[$name]) || Event::hasHandlers($this, $name);
}
/**
* Returns a value indicating whether there is any handler attached to the named event.
* @param string $name the event name
* @return boolean whether there is any handler attached to the event.
*/
public function hasEventHandlers($name)
{
$this->ensureBehaviors();
if (!empty($this->_events[$name])) {
return true;
} else {
return Event::hasHandlers($this, $name);
}
}
