IOC Container, BeanFactory, Lazy & Eager Loading. Spring-Ep:2 #springframework #learnjava #bengali

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Chapters ❤
0:00 Introduction
01:32 Spring IOC Container
03:10 What is Bean
03:22 Type Of IOC Container
03:32 BeanFactory Container
04:29 Code Implementation
10:56 APIs of BeanFactory
11:21 getBean()
11:35 containsBean()
12:42 isSingleton()
13:58 isPrototype()
14:48 getAliases()
17:20 XmlBeanFactory class is deprecated
19:18 Lazy Loading vs. Eager Loading

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Spring IOC Container
Spring IoC Container is the core of Spring Framework. It creates the objects, configures and assembles their dependencies, and manages their entire life cycle. The Container uses Dependency Injection(DI) to manage the components that make up the application. It gets the information about the objects from a configuration file(XML) or Java Code or Java Annotations and Java POJO class. These objects are called Beans.

Bean
In Spring, the objects that are managed by the Spring IoC container are called Beans.

Spring provides two types of Containers namely
BeanFactory Container
ApplicationContext Container

BeanFactory Container

BeanFactory represents a basic IoC container which is a parent interface of ApplicationContext.BeanFactory uses Beans and their dependencies metadata to create and configure them at run-time.

*For accessing a resource from the classpath, we can simply use ClassPathResource.

Let's discuss some of its important APIs.

1. The getBean() API
Various versions of the getBean() method return an instance of the specified bean, which may be shared or independent across the application.

2. The containsBean(String name) API
This method confirms if this bean factory contains a bean with the given name.

3.The isSingleton(String name) API

4. The isPrototype(String name) API

5. The getAliases(String name) API
Return the aliases for the given bean name, if any.

Note: XmlBeanFactory class is deprecated.

Lazy Loading vs. Eager Loading
BeanFactory(XmlBeanFactory) loads beans on-demand, while ApplicationContext loads all beans at startup. Thus, BeanFactory is lightweight as compared to ApplicationContext.

lazy-init="true"

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Timeline
Spring IOC Container ---- 01:32
What is Bean 03:10
Type Of IOC Container --- 03:22
BeanFactory Container --- 03:32
Code Implementation 04:29
APIs of BeanFactory 10:56
getBean() 11:21
containsBean() 11:35
isSingleton() 12:42
isPrototype() 13:58
getAliases() 14:48
XmlBeanFactory class is deprecated -- 17:20
Lazy Loading vs. Eager Loading 19:18