/**
* Run the controller. Dequeues signals from the SW Engine's internal queue and
* notifies the listeners that a signal from SW Engine has been received
*
* @return void
*/
public function run()
{
$timeout = $this->_options[self::OPT_TIMEOUT];
Streamwide_Engine_Logger::info('Going to main loop');
for (;;) {
// Fetch a new signal from the SW Engine's queue
$signal = Streamwide_Engine_Signal::dequeue(array('timeout' => $timeout));
if (false === $signal) {
continue;
}
// Update the loggers event items
Streamwide_Engine_Logger::updateLogEventItems(array($signal->getPhpId() => $signal->getParams()));
// Log the received signal
Streamwide_Engine_Logger::dump($signal->toArray(), 'Received event from SW Engine:');
if ($signal->getName() === Streamwide_Engine_Signal::CREATE) {
// We have received a CREATE (new call), we need to create a new application to handle
// the call
if (false === ($application = $this->_createNewApplication($signal))) {
continue;
}
// Add the new application to the controller's running apps storage (will call
// the application's start method)
$this->addApp($signal->getPhpId(), $application);
} else {
// We have received a signal from SW Engine, we need to notify the listeners
$event = new Streamwide_Engine_Events_Event($signal->getName());
$event->setParam('signal', $signal);
$this->dispatchEvent($event);
}
}
}
/**
* Sends a signal to SW Engine
*
* @param integer $retries If as_send_event returns false, we can retry to send the signal
* @return boolean
*/
public function send($retries = 0)
{
if (!is_int($retries)) {
$retries = (int) $retries;
}
$array = $this->toArray();
do {
Streamwide_Engine_Logger::dump($array, 'Sending to SW Engine:');
$sent = $this->_engineProxy->sendEvent($array);
Streamwide_Engine_Logger::info(sprintf('Signal "%s" %s sent to SW Engine', $array[self::SIG_NAME], $sent === true ? 'successfully' : 'unsuccessfully'));
$retries--;
} while (false === $sent && $retries > 0);
return $sent;
}
/**
* Dispatches an event. This means notifying all listeners and passing them the event object
*
* @param Streamwide_Event_Interface $event
* @param scalar $phpId
* @return void
*/
protected function _dispatchEvent(Streamwide_Event_Interface $event, $phpId)
{
$eventType = $event->getEventType();
$logMessage = 'Preparing to dispatch the "%s" event in phpId "%d" from event dispatcher of class "%s"';
Streamwide_Engine_Logger::info(sprintf($logMessage, $eventType, $phpId, $this->_class));
$logMessage = 'The event listeners count for class "%s" is %d';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $this->_class, $this->_count));
// search the event listener list for info that matches the php id and event type
if (!isset($this->_list[$phpId][$eventType])) {
$logMessage = 'Event "%s" will not be dispatched in phpId "%d" from event dispatcher of class "%s"';
$logMessage .= ' because no event listeners subscribed to it';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $eventType, $phpId, $this->_class));
return;
}
// If the event does not have a source yet, set the source to be the instance of this class,
// this is needed because event dispatching capabilities can be aquired through composition too,
// not only through inheritance
if (null === $event->getEventSource()) {
$event->setEventSource($this);
}
foreach (new ArrayIterator($this->_list[$phpId][$eventType]) as $offset => $listener) {
if (!$event->isDispatchable()) {
$logMessage = 'Breaking out of the event dispatching loop in phpId "%d" from event dispatcher of class "%s"';
$logMessage .= ' because the event object has been marked as undispatchable';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $phpId, $this->_class));
break;
}
if (!isset($this->_list[$phpId][$eventType][$offset])) {
$forceExecution = $listener->getForceExecution();
if ($forceExecution) {
$logMessage = 'Forcing execution of listener "%s" from "%s"';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $listener->getLoggingName(), $this->_class));
} else {
$logMessage = 'Could not find offset "%d" in the event listener list in class "%s" while dispatching event "%s"';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $offset, $this->_class, $eventType));
continue;
}
}
$specification = $listener->getNotifyFilter();
if (!$specification->isSatisfiedBy($event)) {
$logMessage = 'Event "%s" will not be dispatched in phpId "%d" from event dispatcher of class "%s"';
$logMessage .= ' because the event does not satisfy the listener\'s specifications';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $eventType, $phpId, $this->_class));
continue;
}
if ($listener->isAutoRemovableBeforeExecution()) {
$removeGroup = $listener->getRemoveGroup();
if ($removeGroup && null !== ($groupName = $listener->getGroup())) {
$this->_flushByGroup($groupName);
} else {
unset($this->_list[$phpId][$eventType][$offset]);
$this->_count--;
$logMessage = 'Listener "%s" was automatically removed before execution from "%s"';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $listener->getLoggingName(), $this->_class));
$logMessage = 'The event listeners count for class "%s" is %d';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $this->_class, $this->_count));
}
}
// execute the listener
$listener->execute($event);
if ($listener->isAutoRemovableAfterExecution()) {
$removeGroup = $listener->getRemoveGroup();
if ($removeGroup && null !== ($groupName = $listener->getGroup())) {
$this->_flushByGroup($groupName);
} else {
unset($this->_list[$phpId][$eventType][$offset]);
$this->_count--;
$logMessage = 'Listener "%s" was automatically removed after execution from "%s"';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $listener->getLoggingName(), $this->_class));
$logMessage = 'The event listeners count for class "%s" is %d';
Streamwide_Engine_Logger::debug(sprintf($logMessage, $this->_class, $this->_count));
}
}
}
if (isset($this->_list[$phpId][$eventType])) {
$this->_performListMaintenance($phpId, $eventType);
}
}
/**
* Execute the action that was attached to a certain event
*
* @param Streamwide_Event_Interface $event
* @return mixed
*/
public function execute(Streamwide_Event_Interface $event = null)
{
Streamwide_Engine_Logger::info(sprintf('Executing callback "%s"', $this->_loggingName));
$args = $this->_args;
$args[] = null === $event ? $this->_event : $event;
return call_user_func_array($this->_callback, $args);
}
