List of Figures

Chapter 1. Did you say reactive?

Figure 1.1. High-level architecture of the Play Framework

Figure 1.2. Threaded web server

Figure 1.3. Evented web server

Figure 1.4. Traditional application deployment model

Figure 1.5. Replicated application deployment model

Figure 1.6. Horizontal architecture model

Figure 1.7. Network partition on a system with four servers. When the partition occurs, server A is isolated from the other servers, yet the application running on the server is still reachable from the outside world. Changes occurring on this server will occur in isolation, and once the network partition is over, there may be data inconsistency between server A and servers B, C, and D.

Figure 1.8. Failure handling and user interaction in Trello

Figure 1.9. Different states of a circuit breaker

Chapter 2. Your first reactive web application

Figure 2.1. Reactive Twitter broadcaster

Figure 2.2. Enumerators, enumeratees, and iteratees

Figure 2.3. Twitter stream transformation step

Figure 2.4. Reactive pipeline from Twitter to the client’s browser

Figure 2.5. Scaling out using replica nodes

Chapter 3. Functional programming primer

Figure 3.1. Car moving on a road, at one instant and the next

Figure 3.2. Two threads accessing the same mutable car at the same time

Figure 3.3. Example of a function in Scala

Figure 3.4. Applying map to a list of integers

Figure 3.5. Applying flatMap to a list of integers

Figure 3.6. An Option represented as a box or a list

Chapter 4. Quick introduction to Play