mozilla-mobile/reference-browser/app/src/main/java/org/mozilla/reference/browser/push
Name Description Size
FirebasePush.kt 466
PushFxaIntegration.kt A lazy initializer for FxaAccountManager if it isn't already initialized. Implementation notes: For push notifications, we need to initialize the service on Application#onCreate as soon as possible in order to receive messages. These are then decrypted and the observers of the push feature are notified. One of our observers is [FxaAccountManager] that needs to know about messages like Send Tab, new account logins, etc. This however comes at the cost of having the account manager initialized and observing the push feature when it initializes (which once again happens on application create) - the total cost of startup time now is additive for the both of them. What this integration class aims to do, is to observe the push feature immediately in order to act as a (temporary) delegate, and when we see a push message from FxA, only then we should initialize and deliver the message. Once FxaAccountManager is initialized, we no longer need this integration as there already are existing features to support these feature requirements, so we safely unregister ourselves. See: [FxaPushSupportFeature] and [SendTabFeature]. A solution that we considered was to pass in [BackgroundServices] to the [Push] class and lazily invoke the account manager - that lead to a cyclic dependency of initialization since [BackgroundServices] also depends on [Push] directly for observing messages via the account-based features. Another solution was to create a message buffer to queue up the messages until the account could consume them - this added the complexity of maintaining a buffer, the possibility of flooding the buffer, and delaying the delivery of high importance messages like Send Tab which are required to be processed immediately. Our final solution ended up being more concise that the above options that met all our required assurances, and most importantly, maintainable. 5501
WebPushEngineIntegration.kt 4089