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Set up notification listener

This topic describes how to set up and remove notification listeners.

Notification listeners trigger a callback function that you define when certain actions are triggered in the SDK.

The most common use case is to send a stream of all feature flag decisions to an analytics provider or to an internal data warehouse to join it with other data that you have about your users.

Notification listener types

For more information about notification listener types and use cases, see Notification listeners.

For code samples, see the following sections.

Add and remove all notification listeners

The example code below shows how to add a listener, remove a listener, remove all listeners of a specific type (such as all decision listeners), and remove all listeners.

use Optimizely\Notification\NotificationType;

// Remove Notification Listener
$optimizelyClient->notificationCenter->removeNotificationListener($notificationId);

// Remove all Notification Listeners
$optimizelyClient->notificationCenter->clearAllNotificationListeners();

// Remove all Notification Listeners of a certain type
$optimizelyClient->notificationCenter->clearNotificationListeners(NotificationType::DECISION);

Set up each type of notification listener

The example code below shows how to set up each type of notification listener.

// import your third-party analytics integration here

#######################################
# SET UP ACTIVATE NOTIFICATION LISTENER
#######################################

public function onActivate($experiment, $userId, $attributes, $variation) {
}

$optimizelyClient->notificationCenter->addNotificationListener(
    NotificationType::ACTIVATE,
    'onActivate'
);


#######################################
# SET UP DECISION NOTIFICATION LISTENER
#######################################

public function onDecision($type, $userId, $attributes, $decisionInfo) {
}

$optimizelyClient->notificationCenter->addNotificationListener(
    NotificationType::DECISION,
    'onDecision'
);



#######################################
# SET UP OPTIMIZELY CONFIG NOTIFICATION LISTENER
#######################################

// listen to OPTIMIZELY_CONFIG_UPDATE to get updated data
public function onConfigUpdate() {
}

$optimizelyClient->notificationCenter->addNotificationListener(
    NotificationType::OPTIMIZELY_CONFIG_UPDATE,
    'onConfigUpdate'
);


#######################################
# SET UP TRACK LISTENER
#######################################

public function onTrack($eventKey, $userId, $attributes, $eventTags, $event) {
}

$optimizelyClient->notificationCenter->addNotificationListener(
    NotificationType::TRACK,
    'onTrack'
);

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