"Welcome To Ashok IT"				
			                         "Spring Boot and MicroServices"
                                                Topic : Spring Boot - Layered Application
                                                  Date  : 26/09/2024
                                                    (Session - 33)   
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Spring Boot Profiles
====================
* Spring Boot Profiles are a feature provided by the Spring Framework and Spring Boot that allows you to define and configure   application environments for different deployment scenarios. 

* Profiles help you customize the behavior of your Spring Boot application based on the specific environment it is running      in,such as development, production, testing, or any other custom profile you define.

* With profiles, you can have different configurations, beans, and properties activated based on the active profile. This       allows you to keep your application codebase unchanged while providing different settings and behaviors depending on the      deployment environment.

* Here's how you can work with Spring Boot Profiles:

1) Defining Profiles
====================
* We can define the each property file/YAML File for each environment with following syntax

     "application-<profilename>.properties/application-<profilename>.yml"

   i) application-dev.properties      >>>>> Dev environment Configurations

  ii) application-qa.poperties        >>>>> QA environment Configurations.

 iii) application-preprod.properties  >>>>> preprod environment Configurations.

  iv) application-prod.properties     >>>>> prod environment Configurations.

application-dev.properties
==========================
database.username=ashokit_dev
database.password=ashokit_dev

application.emails=dev.ashokit@gmail.com

application-qa.properties
==========================
database.username=ashokit_qa
database.password=ashokit_qa

application.emails=qa.ashokit@gmail.com

application-preprod.properties
==============================
database.username=ashokit_preprod
database.password=ashokit_preprod

application.emails=preprod.ashokit@gmail.com

application-prod.properties
===========================
database.username=ashokit_prod
database.password=ashokit_prod

application.emails=ashokitschools@gmail.com


* In your Spring Boot application, you can define profiles by using the @Profile annotation on classes or methods.

Example
=======
@Configuration
@Profile("dev")
public class DevelopmentConfig {
    // Configuration specific to the development profile
}

@Configuration
@Profile("prod")
public class ProductionConfig {
    // Configuration specific to the production profile
}
------------------------------------------------
@Configuration
public class Config{


     @Bean     
     @Profile("dev")
     public DataSource getDataSourceObj(){
        DriverManagerDataSource dmd = new DriverManagerDataSource();
        dmd.setDriverClassName(MySQLJdbcDriverClassName);
        dmd.setUrl(MySqlJdbcURL);
        dmd.setUsername(MySqlUsername);
        dmd.setPassword(MySqlPassword);
    }


    @Bean
    @Profile("prod")
    public DataSource getDataSourceObj1(){
        DriverManagerDataSource dmd = new DriverManagerDataSource();
        dmd.setDriverClassName(OracleJdbcDriverClassName);
        dmd.setUrl(OracleJdbcURL);
        dmd.setUsername(OracleUsername);
        dmd.setPassword(OraclePassword);
    }
}

2) Activate Profiles
====================
* Using the "spring.profiles.active" property in the application.properties or application.yml file

	spring.profiles.active=dev

* Using the System Property i.e.,commandLine Arguments

	-Dspring.profiles.active=dev

* Programmatically activating profiles using the SpringApplication class:

        SpringApplication.setAdditionalProfiles("dev");


NOTE
====
 * If there is no profile activated in Spring Boot Application then it will fall into "default" profile.

IIQ) Is it possible to activate multiple profiles at a time ?

---> Yes we can activate it with following line of code i.e.,spring.profiles.active=prod,qa

     It is not recommended approach for activating the multiple profiles in spring boot application

     Example OUTPUT
     ===============
     The following 2 profiles are active: "prod", "qa"
     ProdConfig Class Constructor
     ashokit_qa=====ashokit_qa=====qa.ashokit@gmail.com
     Activated Profile Name :::::[prod, qa]