RxJava's Consequences: Laziness
Understand the concept of laziness in RxJava and how to implement deferred execution to ensure long-running operations only occur when necessary. This lesson teaches you to use operators like .defer() and .fromCallable() to keep your reactive streams efficient and aligned with RxJava principles for Android development.
We'll cover the following...
We'll cover the following...
Issue: Violation of RxJava’s Laziness
RxJava is designed with laziness in mind. Revisit Lazy Emissions]for a reminder. That is, no long operations should be performed when there are no subscribers to the Observable. With this modification, that assumption is no longer true since UserCache.getAllUsers() is invoked even before there are any subscribers. Whether or not the backing cache is in memory or on disk, ...