Hire Top Magento developers with Ultragenius

A service contract is a set of PHP interfaces defined for a module. It includes - 

Data Interfaces  -  Interfaces that preserve data integrity.
Service Interfaces - Interfaces that hide business logic details from service requestors like web services, controllers, and other modules. 

According to service contracts, developers define the set of design patterns that generates a well-defined, durable API(s) that any other module or a third party can implement through Magento models. 

Magento 2 uses dependency injection instead of the functionality provided by Mage class in Magento 1.x. Dependency Injection is a design pattern that allows any object B to use dependencies declared by another object A. The dependencies declared by A are usually the class interfaces and dependencies used by B provide the implementations of those interfaces. This provides loose coupling of code as object A is free from the concern of initializing its dependencies and object B decides what kind of implementation has to be provided to object A based on requirement or configuration.

The ObjectManager is a type of service in Magento that instantiates objects at the starting of bootstrapping process. Magento uses the signatures of the class constructors to get information about the object’s constructor dependencies. When you construct a class, the class dependencies which are present in the di.xml file, are injected into the class constructor by ObjectManager. 

The ObjectManager can be used to maintain backward compatibility for a constructor, in static methods like  __wakeup(), __sleep(), etc., in global scopes, like units of integration testing. 

• app

• bin

• dev

• generated

• lib

• phpserver

•  pub

• The index.php file primarily processes the HTTP requests, 
• The static.php file processes all the HTML, CSS, and Javascript files and finds the file in the pub/static folder.

•  setup

• var

• vendor

Magento API is a web framework that developers and integrators use to establish communication between web services and the Magento system. Magento APIs are primarily responsible for Simple Object Access Protocol (SOAP) and Representational State Transfer (REST). They can be used to create an online shopping application, create Javascript widgets in the Admin Panel, integrate with Custom Relationship Management (CRM) or Enterprise Resource Planning (ERP) backend systems like Xero or Salesforce. 

1. Create a Magento theme folder
2. Create a theme.xml file and put basic information like the name of the theme, parent’s theme (if you are inheriting the theme from an existing theme).
3. Add a composer.json file to the theme directory and register the package on the packaging server.
4. Registration.php file
5. Create the static files and folders
6. Configure images for the catalog product grid.
7. Declare the logo of your theme.
8. Basic layout elements like blocks and containers.
9. Create a theme extending files, override theme, and base layouts.

• Entity -  The entity represents data items, like products, customers, categories, and orders. Each product, category, customer, and order will have its record in the database.

• Attribute - The attribute represents the data items belonging to an entity like product will have its name, price, entity, order status, and more.

• Value - The value attribute is the value of an attribute like the price of any product is 50 rupees.

Composer.Lock contains information about all the Magento packages and dependencies. It ensures that all the website versions on a server should be aligned. If the developer doesn’t use composer.lock while doing changes to the website, the store versions will differ and if the merchant will load it again he/she might face problems while re-installing it.