The leftmost arrow-head indicates the direction of the stream, with the items emitted in sequence until the complete signal to indicate that all five to-dos have been emitted. In an app that displays a list of to-do items comprising a title and description, for example, the data item in the stream could be an instance of a class like this □ It represents the kind of information the consumer expects. In Java, it can be an instance of a pre-built or user-defined class. There are three main types of objects that flow in the stream: a data object, an error, and a complete signal. A stream, like its name suggests, consists of a flow of data (or objects, signals, …) from a source to a consumer. It is centered around the notion of a stream. Reactive Programming is similar to the explained Observer Design Pattern. Secondly, what happens to the thread when the Data Source is no longer needed? These are some of the issues that can be resolved when using RxJava. In the real world, this exception could be a network interruption which is important to notify the Observer of. For instance, the Observer is not notified when for some reason the thread in pushUpdates() in Illustration 4 is interrupted. There are a couple of issues with this trivial example. An Observer is subscribed to receive random integers from the Data Source.
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