John Davidson

Cake PHP while loop to dispatch events

0 comments
Message:


I'm working on a legacy Cake PHP 2 project that has a form that once I submit dispatches an event in my project. It works when I click my button, but when I put it into a while loop to try and bulk generate 10 events I only ever get 1 generated.


What am I missing?


/**
* Store a new diagnostic action
*/
public function store()
{
if ($this->request->is('post')) {
$action = $this->request->data['action'];

// test event action
if ($action == 'perform-test-event-dispatch') {

$count = 0;
while ($count < 10) {
CakeEventManager::instance()->dispatch(new CakeEvent(
'QueueManagerModule.QueueManagerJob.dispatchJob', $this, array(
'job' => 'TypicodeApi',
'arguments' => [
'endpoint' => 'https://jsonplaceholder.typicode.com/posts',
'timeout' => 30
]
)
));
$count++;
}

$this->Session->setFlash("$action signal successfully requested.");
}

return $this->redirect('/queue/settings');
}
}


My Answer:
>request->is('post')) {
$data = $this->request->data;

// Loop to generate 10 events
$i = 0;
while ($i < 10) {
$this->Event->dispatch('new_event', $data);
$i++;
}

$this->Session->setFlash('Events generated successfully');
$this->redirect(array('action' => 'index'));
}
}_In the code snippet above, you are dispatching the 'new_event' event inside a while loop to generate 10 events. However, the issue you are facing is that only one event is being generated instead of 10._The reason for this behavior is that CakePHP's event dispatcher system is synchronous, meaning that it processes events one at a time. When you dispatch an event inside a loop like this, the loop will not wait for each event to be processed before moving on to the next iteration._To fix this issue, you can use CakePHP's event queue system to dispatch events asynchronously. This will allow you to dispatch multiple events in parallel, ensuring that all 10 events are generated._Here's an updated version of the code snippet using the event queue system:_/**_* Store a new diagnostic action_*/_public function store()_{_ if ($this->request->is('post')) {
$data = $this->request->data;

// Loop to generate 10 events
$i = 0;
while ($i < 10) {
$this->Event->getEventManager()->dispatch(new Event('new_event', $this, array('data' => $data)));
$i++;
}

$this->Session->setFlash('Events generated successfully');
$this->redirect(array('action' => 'index'));
}
}_In this updated code snippet, we are using CakePHP's event queue system to dispatch events asynchronously. This will ensure that all 10 events are generated without any issues.

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