Freaks City

1. Example: One Person and Two Pets 1.1 Cat class public class Cat { public void Cry() { System.out.println("Hiss"); } } 1.2 Dog class public class Dog { public void Cry() { System.out.println("Bark"); } } 1.3 People class public class People { private String name; private Cat cat ...

Problem Statement In a flash sale system, I encountered a scenario where one aspect handles Redis-based distributed locking and rate limiting, while another aspect is responsible for publishing order messages to a message queue. The core challenge: how to transmit data computed in the first aspect to the second aspect for further processing. So ...

Core Concepts of Interceptors In Spring applications, interceptors serve as middleware components designed to execute custom logic before or after HTTP requests are processed. Unlike Aspect-Oriented Programming (AOP), which targets method-level cross-cutting concerns, interceptors specifically focus on the request processing pipeline. Intercept ...

AOP enables method enhancement without modifying the original source code (enhancement = proxy). AOP Pointcut Expression Syntax: execution([access modifier] [return type] [full class path] [method name] ([parameter list])) Example: @Before(value = "execution(* com.example.service.AccountService.deposit(..))") Join Point Any method w ...

Prior to the introduction of Spring 3.x, configuration in Spring primarily relied on XML files. With the release of Spring 3.x, JavaConfig was introduced as a method of configuration based on Java code. This approach allows developers to define Spring container configurations and manage Spring beans through Java code, eliminating the need for e ...

Defining the Custom Constraint Annotation import javax.validation.Constraint; import javax.validation.Payload; import java.lang.annotation.*; @Constraint(validatedBy = RecordIdValidator.class) @Target({ElementType.FIELD}) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface RecordExists { String message() default "The pr ...

IoC Container Basics The Spring IoC (Inversion of Control) container manages application components and their lifecycle. Instead of creating objects manually, you define beans in configuration, and the container handles instantiation and wiring. Defining Beans A bean definition specifies how an object should be created and managed. In XML confi ...

Overview Spring provides comprehensive transaction management capabilities through its abstraction layer over various transaction APIs. This framework simplifies handling database transactions by offering both programmatic and declarative approaches. Core Interfaces PlatformTransactionManager The PlatformTransactionManager interface serves as t ...

Quartz Overview Quartz is an open-source project specializing in job scheduling. It can be used standalone or integrated with the Spring framework, with the latter being the preferred approach in production environments. Quartz enables development of single or multiple scheduled tasks, each with configurable execution patterns such as hourly ex ...

MyBatis-Spring Integration Before diving into the integration, let's review the core MyBatis components. Entity Class package com.example.entity; public class User { private Integer id; private String username; private String password; @Override public String toString() { return "User{" + ...