PostConstruct.md

@PostConstruct

Introduction

In the Bring framework, @PostConstruct is a method-level annotation used to indicate that a method should be invoked immediately after an instance of the bean is constructed, and before any other initialization logic occurs.

Usage

To use @PostConstruct, follow these steps:

1. Add the Annotation: Place the @PostConstruct annotation on a method within your Bring bean class.

   import io.github.blyznytsiaorg.bring.core.annotation.PostConstruct;
   
   public class MyBean {
   
       @PostConstruct
       public void init() {
           // Initialization logic here
           // This method will be called after bean instantiation.
       }
   }

2. Invoke the Bring Container: Make sure that you obtain the bean from the Bring container. The @PostConstruct annotated method will be automatically invoked.

   import io.github.blyznytsiaorg.bring.core.BringApplication;
   
   public class MyApp {
       public static void main(String[] args) {
            var bringApplicationContext = BringApplication.run("your.path");
            var myBean = bringApplicationContext.getBean(CustomPostConstruct.class);
               // Your bean is now initialized, and @PostConstruct method has been called.
           }
       }

Important Points

• The method annotated with @PostConstruct must not have any parameters.
• This annotation is generally used in conjunction with the @Component stereotype annotations (e.g., @Service, @Repository, @Controller) or in configuration classes.
• The @PostConstruct method will be invoked after the bean has been constructed and before any custom initialization logic specified in the bean definition.

Example

Here is a simple example of a class using @PostConstruct:

import io.github.blyznytsiaorg.bring.core.annotation.PostConstruct;

public class ExampleBean {

    private String message;

    @PostConstruct
    public void init() {
        message = "Hello, this is an example!";
        // Additional initialization logic
    }

    public String getMessage() {
        return message;
    }
}

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