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Accessing an API back-end from Angular client may result in missing response headers. A common scenario is a missing Authorization header, containing the JSON Web Token (JWT) which is returned from the back-end service when the user logs in successfully.
As we learned in the previous chapter dependency injection is a very powerful technique. DI is provided by the Spring 5 Framework implementation of the Inversion of Control (IoC) principle.
Each Object-oriented application consists of many classes that work together in order to solve a problem. However, when writing a complex application, application classes should be as independent as possible.
In this article we will go through the steps of creating a simple game screen. We will make it the traditional way without using View Model and we will see why it is absolutely wrong to persist data in the View.
ViewModel – it is a model of the view. The purpose of the ViewModel is to apply any business logic to the Model before exposing it to the View for consumption. This way the View is free of business logic.
In the Android application CryptoOracle the data is persisted in SQLite database. The reasons are two:
The application can still work and show persisted data when there is no internet connection.
Accessing an API back-end from Angular client may result in missing response headers. A common scenario is a missing Authorization header, containing the JSON Web Token (JWT) which is returned from the back-end service when the user logs in successfully.
As we learned in the previous chapter dependency injection is a very powerful technique. DI is provided by the Spring 5 Framework implementation of the Inversion of Control (IoC) principle.
Each Object-oriented application consists of many classes that work together in order to solve a problem. However, when writing a complex application, application classes should be as independent as possible.
In this article we will go through the steps of creating a simple game screen. We will make it the traditional way without using View Model and we will see why it is absolutely wrong to persist data in the View.
ViewModel – it is a model of the view. The purpose of the ViewModel is to apply any business logic to the Model before exposing it to the View for consumption. This way the View is free of business logic.
In the Android application CryptoOracle the data is persisted in SQLite database. The reasons are two:
The application can still work and show persisted data when there is no internet connection.
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