#InversionOfControl

[anusha-g]

What is the significance of Java frameworks like Spring in full stack development?

Java frameworks, particularly Spring, play a crucial role in full-stack development by providing a comprehensive set of tools and libraries that simplify the process of building robust, scalable, and maintainable web applications. Here are several key aspects highlighting the significance of Java frameworks like Spring in full-stack development:

Modularity and Reusability:

Spring Modules: Spring is designed as a modular framework with various modules such as Spring Core, Spring MVC, Spring Security, and more. This modularity allows developers to pick and choose the components they need, promoting a modular and reusable codebase.

Dependency Injection (DI):

Inversion of Control (IoC): Spring implements the IoC design pattern through dependency injection. This helps in reducing the coupling between components, making the code more maintainable and testable. Developers can easily manage and inject dependencies into components, promoting a more flexible and scalable architecture.

Aspect-Oriented Programming (AOP):

Cross-Cutting Concerns: Spring provides AOP support, allowing developers to separate cross-cutting concerns (e.g., logging, security, transaction management) from the core business logic. This enhances code modularity and maintainability.

Data Access:

Spring Data: For data access, Spring offers the Spring Data module, which simplifies database operations. It supports various data sources and provides a consistent programming model, reducing boilerplate code and enhancing developer productivity.

Model-View-Controller (MVC):

Spring MVC: For building web applications, Spring MVC offers a powerful and flexible MVC framework. It promotes the separation of concerns between the model, view, and controller, making it easier to manage and maintain the codebase.

Transaction Management:

Declarative Transaction Management: Spring simplifies transaction management through annotations and XML configuration, allowing developers to define transactional behavior declaratively. This helps in maintaining data integrity in complex business operations.

Security:

Spring Security: Security is a critical aspect of web applications. Spring Security provides comprehensive security services for Java EE-based enterprise software applications. It offers features such as authentication, authorization, and protection against common security vulnerabilities.

Integration with Other Technologies:

Integration Capabilities: Spring can be easily integrated with various technologies and frameworks. For example, it can integrate seamlessly with Hibernate for ORM, Apache Camel for integration patterns, and many other third-party libraries, making it versatile for different project requirements.

Testing Support:

Unit Testing: Spring's design principles, such as dependency injection, make it easier to write unit tests for components. Spring's testing support, along with the use of interfaces and abstractions, facilitates the creation of testable and maintainable code.

Community and Ecosystem:

Active Community: Spring has a large and active community of developers, which means that there is extensive documentation, forums, and third-party resources available. This community support is valuable for troubleshooting, learning, and staying updated on best practices.

Java frameworks like Spring not only provide a solid foundation for building applications but also evolve to address emerging challenges and technologies, making them a reliable choice for full-stack development. In summary, Java frameworks like Spring provide a robust foundation for full-stack development by offering modularity, abstraction, and a wide range of features that simplify the development process. They contribute to the creation of scalable, maintainable, and secure applications, making them a preferred choice in the Java ecosystem for building enterprise-level systems.

[completedeveloperpodcast]

Inversion of Control in Legacy Applications

Dealing with #legacycode via #dependencyinjection and #inversionofcontrol #completedevpod

When you get dropped into a legacy project, one of the main things you’ll miss is the use of more modern development practices, such as testing, inversion of control, proper object models, and configuration management. However, you probably can’t simply stop active development for six months to re-architect your entire application. This is especially risky if you don’t have a proven track…

[indra0237-blog]

Inversion of Control and Dependency Injection

These concepts are very popular and appear frequently in Java Software Engineer job interviews.

In Java and other programming languages, traditionally, when you need to call a method of an object, you will instantiate the object’s class first and after that call the method. As your program grows bigger and more complex, this kind of operation will become more tedious to do because suddenly they are everywhere and there are many of them. 

What if your program does not need to care about this object instantiation stuffs and just call a method of an object as if the object has been instantiated somewhere. We can reduce the amount of code and increase the amount of readability. Let’s meet Inversion of Control which means the instantiation stuffs are done somewhere and we can just use the instantiated object in our program. Why choose inversion in the naming? Well, because control-wise the flow has been inverted from you-instantiate-the-object into something-somewhere-instantiate-the-object. And what about Dependency Injection? It is a form of Inversion of Control which means the dependencies between your program and your objects are injected from somewhere by something.

To do example, I am using Spring Framework and Java Annotations here, but these concepts are available in other programming languages using other similar frameworks as well. 

@Repository public class EmployeeRepository { ... }

@Component public class OurMainApp {   @Resource   EmployeeRepository employeeRepository;   public List<EmployeeEntity> getOurEmployees() {     return employeeRepository.findAll();   } }

As you can see I have EmployeeRepository class whose method findAll() I need to call in my OurMainApp program. I don’t have any instantiation operation which normally will be new command. I assume and trust Spring Framework will inject my employeeRepository property with ready to use instantiated object.

Summary

Inversion of Control and Dependency Injection are game changer concepts and have changed the way Software Architects design their software solutions.

We must as much as possible use these concepts. But sometimes, some classes only allow their objects to be instantiated by using some static methods, which are resulting singleton objects. We cannot use Inversion of Control and Dependency Injection for this case.

[gfader]

What Technology to Use on the Microsoft Stack

Great article that shows technology choices from Microsoft for different platforms (Browser, Mobile, Desktop)

>> Try to Leave Silverlight and Flash Soon >> Mobile Web: Anything but Web Forms

I am wondering what SharePoint is going to use as their technology in the future

Microsoft spends a surprising amount of time discussing dependency injection and inversion of control containers. They list nine separate Inversion of Control Containers, the majority of which are community run projects unaffiliated with Microsoft. It should be noted many of the frameworks they list are not actually IoC Containers but rather Dependency Injection frameworks. The confusion between to two continues throughout the section with no clear indication if Microsoft prefers composite roots (a DI pattern) or service locators (an IoC Container pattern), which is rather frustrating because, as Mark Seemann argues, they are essentially opposites.

MS still not getting it right?

Full article http://www.infoq.com/articles/Microsoft-Stack-2013