Chapter 8 - Reflection & Dependency Injection

Reading Materials

·         Jenkov Tutorial - Reflection API

·         SOLIDprincipals

·         Martin Fowler – Dependency Injection

·         Howto Do in Java – Factory Pattern

·         Google- Guice – Read the users guide

Exercise:

In the previous exercises we used Constructor Injection to pass the algorithm implementation of choice.

Replace this method of DI with Google Guice’s @Inject annotation.

Everything should be defined in Guice’s AbstractModule (you should inherit from it).

Update the automatic tests to work with the injection configuration using Guice (it is possible to implement this using an inner class in the tests).

The key creation method should be changed to the following method (instead of a random key):

-       Read the method names of all the methods in the implementation class of the algorithm (e.g. DoubleEncryption) using reflection API.

-       Write a hash function that transforms the list of strings (method names) to the key.