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Programmer DD
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Programmer DD

A tinkering programmer and author of "Spring Cloud Microservices in Action"

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Latest from Programmer DD

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Programmer DD
Programmer DD
May 23, 2024 · Backend Development

Mastering High‑Concurrency Architecture: From Metrics to Read/Write Splitting and Caching

This article explains the essential elements of high‑concurrency system design—performance, availability, scalability—introduces quantitative metrics, classifies read‑heavy and write‑heavy scenarios, and details practical solutions such as database read/write separation, local and distributed caching, cache‑penetration and avalanche mitigation, and CQRS implementation for billion‑user applications.

CQRSCachingPerformance Metrics
0 likes · 22 min read
Mastering High‑Concurrency Architecture: From Metrics to Read/Write Splitting and Caching
Programmer DD
Programmer DD
May 23, 2024 · Backend Development

6 Essential Ways to Read Request Parameters in Spring Boot

This guide explains six common Spring Boot techniques—@RequestParam, @PathVariable, @MatrixVariable, @RequestBody, @RequestHeader, and @CookieValue—for extracting URL query strings, path variables, matrix variables, request bodies, headers, and cookies, complete with code examples for each method.

APIBackend DevelopmentJava
0 likes · 5 min read
6 Essential Ways to Read Request Parameters in Spring Boot
Programmer DD
Programmer DD
May 14, 2024 · Information Security

Why My Game Score Rankings Went Crazy: Lessons from RSA & AES API Encryption

The article recounts a real‑world incident where a game’s leaderboard showed absurd scores due to insecure API parameters, then explains RSA and AES fundamentals, demonstrates how to combine asymmetric and symmetric encryption for secure request handling, and provides Java code, custom annotations, and AOP logic to automate decryption on the server side.

AESAPI SecurityJava
0 likes · 23 min read
Why My Game Score Rankings Went Crazy: Lessons from RSA & AES API Encryption
Programmer DD
Programmer DD
May 14, 2024 · Operations

Mastering Full‑Link Load Testing: The Ultimate Guide to Capacity Assurance

This article explains the concept, challenges, step‑by‑step process, organizational and tool requirements, capacity governance, planning, and AI‑driven prediction for full‑link load testing, illustrating how enterprises can ensure system capacity and stability during large‑scale online events.

Operationscapacity assurancefull-link load testing
0 likes · 9 min read
Mastering Full‑Link Load Testing: The Ultimate Guide to Capacity Assurance
Programmer DD
Programmer DD
Apr 23, 2024 · Operations

Singapore's New Flexible Work Policy: Can Employees Choose Remote Hours?

Singapore's Ministry of Manpower announced that from December 1 employees can formally request flexible work arrangements—including remote work, flexi‑time, and flexi‑load—with employers required to respond within two months, while the guidelines remain non‑binding and global four‑day work‑week experiments illustrate growing demand for such flexibility.

Remote WorkSingapore labor policyflexible work
0 likes · 9 min read
Singapore's New Flexible Work Policy: Can Employees Choose Remote Hours?
Programmer DD
Programmer DD
Apr 9, 2024 · Backend Development

What’s New in Java 22? Explore 12 Key Features and Their Benefits

Java 22 introduces twelve enhancements—including seven preview and one incubator features—spanning language syntax, APIs, performance, and tooling, with detailed explanations of each JEP’s purpose, value, and impact on developer productivity and code readability.

Backend DevelopmentJDK 22JEP
0 likes · 15 min read
What’s New in Java 22? Explore 12 Key Features and Their Benefits
Programmer DD
Programmer DD
Mar 22, 2024 · Databases

Redis Shifts to Source‑Available Licenses: What It Means for Developers

Redis announced that starting with version 7.4 it will abandon the BSD 3‑Clause license in favor of a dual SSPLv1/RSALv2 model, making the source code source‑available while keeping the community edition free, and clarifying the impact on cloud providers, partners, and end‑users.

LicensingRSALSSPL
0 likes · 4 min read
Redis Shifts to Source‑Available Licenses: What It Means for Developers