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Taejins LLC Programming Guides

website·Indexed 30 days ago

https://llc.taejins.com/intro

A comprehensive collection of technical tutorials and guides covering Java, Spring (including Spring Batch, Spring Security, and WebFlux), JavaScript (Angular, Solid.js, and React Testing Library), Python (SQLAlchemy 2.0), TypeScript, and server integration with Nginx, Tomcat, and mod_jk.

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What's inside Taejins LLC

  1. Introduction to RxJS and Reactive Programming

    RxJS (Reactive Extensions for JavaScript) is a library for managing asynchronous data streams. It implements the reactive programming paradigm, which treats all events (clicks, HTTP responses, timers, user input) as streams. Unlike traditional request-response patterns, the reactive approach involves subscribing to a data stream and automatically processing data as it arrives.

  2. Introduction to Next.js Server Actions

    Server Actions in Next.js 15 allow developers to call server-side functions directly from the client. This eliminates the need to create separate API endpoints for data mutations (like form submissions), simplifying the process of updating server-side data.

  3. Overview of Sticky Sessions (Session Affinity)

    Sticky Session (Session Affinity) is a load balancing technique that ensures requests from the same client are always routed to the same backend server. This is typically achieved by the load balancer reading a routing suffix in a session cookie (e.g., .server2) or injecting its own cookie. It requires no application code changes, making it ideal for legacy systems.

  4. Overview of the Language Learning Center (LLC) Platform

    The Language Learning Center (LLC) is a curriculum-based programming education platform that provides structured roadmaps for developers. It reorganizes fragmented technical information from blogs and official documentation into step-by-step professional curricula covering programming fundamentals, enterprise frameworks, modern web frontends, and cloud infrastructure.

  5. Introduction to Java Generics

    Generics allow classes and methods to take a type as a parameter (e.g., using T instead of a hardcoded type like String). This provides compile-time type safety, eliminates the need for manual casting, and enables the creation of reusable algorithms that work across different types.
    // With generics: compile-time safety
List<String> list = new ArrayList<>();
list.add("hello");
// list.add(42); // COMPILE ERROR

String s = list.get(0); // No cast needed

  6. Overview of the Java Map Interface

    The Map interface in Java is a collection that stores data as unique key-value pairs. It provides instant value lookup by key, making it suitable for caching, frequency counting, and configuration storage. Key characteristics include: keys must be unique (adding a duplicate key replaces the existing value), values may be duplicated, and while it is part of the collection framework, Map does not extend the Collection interface.

  7. Overview of Java OOP II Core Concepts

    Java's advanced Object-Oriented Programming (OOP) is built on four primary pillars that enable design patterns, SOLID principles, and frameworks like Spring Boot:

    • Inheritance: Establishing parent-child relationships using the extends keyword to reuse fields and methods.
    • Polymorphism: Using upcasting, downcasting, and the instanceof operator to achieve flexible code and dynamic binding.
    • Abstraction: Utilizing abstract classes and interface for contract-based programming and design tools.
    • Encapsulation: Protecting data using private modifiers, getters/setters, and Record types for immutable classes.
    • The super Keyword: Used to access parent members via super.field, super.method(), and for constructor chaining via super().

  8. Overview of Pinia for Vue 3

    Pinia is the official state management library for Vue 3, designed as the successor to Vuex. It provides a centralized store to manage shared data across components, solving the 'props drilling' problem. Key advantages include full support for the Composition API, native TypeScript support with automatic type inference, a significantly smaller bundle size (~1.5KB), and the removal of mutations to reduce boilerplate.

  9. Overview of NestJS framework

    NestJS is a Node.js server framework written in TypeScript. It is heavily inspired by Angular and is built around Decorators and Dependency Injection (DI). It provides full type safety, a declarative coding style, and a module system for separation of concerns. It can run on top of Express or Fastify.

  10. Overview of AJP (Apache JServ Protocol)

    AJP is a high-speed binary protocol designed for communication between a web server (Apache HTTPD) and a Web Application Server (WAS) like Tomcat. While it offers lower parsing overhead than HTTP, it is now considered a legacy method. For new systems, using an HTTP proxy (mod_proxy_http) is recommended over AJP.

  11. Overview of DDoS attack types and defense strategies

    Different DDoS attack types target different network layers and require specific defense mechanisms:

    Attack TypeLayerDefense Method
    SYN FloodL4 (TCP)OS SYN Cookies, Firewall
    UDP FloodL4 (UDP)Firewall, Rate Limiting
    HTTP FloodL7 (HTTP)Rate Limiting, WAF
    SlowlorisL7 (HTTP)Timeout settings, Connection limits
    DNS AmplificationL3/L4Upstream filtering

  12. Overview of Prisma ORM

    Prisma is a next-generation Object-Relational Mapper (ORM) based on TypeScript. It uses a schema file to define data models and automatically generates a type-safe client for database queries. It consists of four main components: Prisma Schema (model definition), Prisma Client (type-safe query builder), Prisma Migrate (schema-based migrations), and Prisma Studio (GUI for data visualization).