SER516 Lecture 17

SER516 Software Agility: Project and Process Management Lecture 17. Clean
Design II Javier Gonzalez-Sanchez javiergs@asu.edu javiergs.engineering.asu.edu Office Hours: By appointment

About Your Velocity …

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 3 Numbers
for Project 2 Team Hours Points 1 40 55 2 20 18 3 75 26 4 5 10 20 6 50 60 7 48 45 8 44 52 • 5 members per team working 10 hours per week each • 50 person-hours per week

for Project 3 Team Hours Points 1 49 91 2 63 55 3 103 37 4 5 34.5 70 6 59 84 7 60 66 8 56 65 • 5 members per team working 10 hours per week each • 50 person-hours per week

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 5 Estimated
Numbers for Project 4 Team Hours Points 1 85 140 2 110 100 3 117 48 4 5 50 100 6 90 110 7 60 70 8 108 136 • 5 members per team working 10 hours per week each • 50 person-hours per week

for Project 4 § Size P4 in Points § Size P4 in Hours (optional) § Sprints = Size P4 / Average Velocity P2 and P3

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 7 Sprint
Size Team Size P4 Average points per sprint Sprints Did you complete it? 1 140 73 1.91 2 100 36.5 2.7 3 48 31.5 1.52 4 5 100 45 2.22 6 110 72 1.52 7 70 55.5 1.26 8 136 58.62 2.32 • 5 members per team working 10 hours per week each • 50 person-hours per week

Separation of Concerns (SoC)

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 9 Design
Principles § Concerns and Separation of concerns § Dependencies and Dependency Injection § Low Coupling

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 10 Patterns
§ Observer (behavior) § Delegate (behavior) § Factory (creation)

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 11 Factory
class Creator { public Product create() { return new Product (); } } class Client { private Iproduct product; public Client(Creator factory){ product= factory.create (); } public void run() { // ... } } public static void Main() { Creator creator = new Creator(); Client client = new Client(creator); client.run(); }

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 12 Factory
§ JSON string to JSON object § Gson and/or Guava library Gson g = new Gson(); MyClass example = g.fromJson(stringToParse, MyClass.class) § JSON-Simple library JSONParser parser = new JSONParser(); JSONObject json = (JSONObject) parser.parse(stringToParse); § Jackson library MyClass object = new ObjectMapper().readValue(jsonString, MyClass.class);

Dependency Injection (DI)

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 14 Dependency
Injection (DI) § A Java class has a dependency on another class, if it uses an instance of this class. § A class should not configure its dependencies statically (new) but should be configured from the outside (using vs having). § hard dependency – a class creates an instance of another class via the new operator § dependency injection – passing of a dependency to a dependent object (as a parameter)

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 15 Dependency
Injection (DI) public class ClientFrame { ... public ClientFrame() { ... = new PlotPanel(); ... = new FacePanel(); ... = new ConsolePanel(); ... = new JButton(); ... = new JLabel(); } } public class ClientFrame { public ClientFrame(Jpanel a, Jpanel b) { } }

Low Coupling

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 17 Definition
§ Low coupling. Coupling refers to the degree to which the different classes depend on each other. All classes should be independent as far as possible. § Create Mock objects (dummy implementations that emulate real code). § Create Interfaces

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 18 Separation
of Main § Execution vs Construction § Design the system assuming that all objects are constructed and wired up

Test Yourselves

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 20 What
about this? View Controller Model Client View Controller Model Server

do you have? Highest value: Lowest value: Average: Channels: Frequency (Hz): Client O X - 2 ▼ localhost:1516 start / stop Console: Highest value: Lowest value: Frequency (Hz): Server O X - 1024 0 5 localhost:1516 start / stop Console:

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 22 Case
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6 sensing device Java platform external native libraries AgentNet toolkit ar.sensing gui ar.perception DelegatePerception <<delegate>> ThreadDevice <<observable, runnable>> PublisherThread <<observer, publisher>> PlotSet <<observer>> ConsoleObserver <<observer>>

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Test Yourselves

do you have? Highest value: Lowest value: Average: Channels: Frequency (Hz): Client O X - 2 ▼ localhost:1516 start / stop Console: Highest value: Lowest value: Frequency (Hz): Server O X - 1024 0 5 localhost:1516 start / stop Console:

Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 31 Level
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Javier Gonzalez-Sanchez | SER516 | Spring 2018 | 63 Reference
§ Clean Code, Chapter 11 and 12.

SER516 – Software Agility Javier Gonzalez-Sanchez javiergs@asu.edu Spring 2018 Disclaimer.
These slides can only be used as study material for the SER516 course at ASU. They cannot be distributed or used for another purpose.

SER516 Lecture 17

SER516 Lecture 17

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