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Lobster Programming

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Latest from Lobster Programming

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Lobster Programming

Mar 6, 2025 · Backend Development

Which Multi‑Tenant Architecture Is Right for Your SaaS? A Deep Dive into 5 Patterns

This article explains five common multi‑tenant implementation patterns—independent databases, shared database with separate schemas, shared tables, hybrid approaches, and containerized isolation—detailing their isolation levels, cost implications, scalability, and suitable use cases for SaaS applications.

ArchitectureDatabase isolationMulti‑Tenant

0 likes · 6 min read

Which Multi‑Tenant Architecture Is Right for Your SaaS? A Deep Dive into 5 Patterns

Lobster Programming

Mar 3, 2025 · Databases

Why Redis Keeps Core Commands Single‑Threaded and How Redis 6 Adds Multi‑Threaded I/O

Redis evolved rapidly, with versions up to 5.x handling all core CRUD commands on a single worker thread, while Redis 6 introduced multi‑threaded network I/O to leverage multi‑core CPUs, yet still processes core business commands single‑threadedly for performance and simplicity, as explained with diagrams.

I/ORedisdatabase

0 likes · 6 min read

Why Redis Keeps Core Commands Single‑Threaded and How Redis 6 Adds Multi‑Threaded I/O

Lobster Programming

Feb 27, 2025 · Fundamentals

Why Garbled Characters Appear: Exploring ASCII, GB2312, GBK & Unicode

This article explains how character encoding works—from ASCII and its extensions to Chinese GB2312 and GBK, through Unicode's UCS‑2, UCS‑4, and the versatile UTF‑8—showing why mismatched encodings produce garbled text and why UTF‑8 is the default in Spring Boot.

ASCIIGB2312GBK

0 likes · 9 min read

Lobster Programming

Feb 24, 2025 · Databases

Mastering Redis Transactions: Commands, Rollback Strategies, and Limitations

Redis, a non‑relational database, implements transaction-like behavior using commands such as MULTI, EXEC, DISCARD, and WATCH, allowing queued execution, optimistic locking, and various rollback granularities, though its semantics differ from traditional relational database transactions.

MULTINoSQLRedis

0 likes · 5 min read

Mastering Redis Transactions: Commands, Rollback Strategies, and Limitations

Lobster Programming

Feb 20, 2025 · Backend Development

Will a JVM Exit When a Thread Runs Out of Memory? Deep Dive with Code

This article investigates whether the JVM terminates when a thread encounters an OutOfMemoryError, demonstrating through Spring Boot controllers and multithreaded examples how main and child threads, daemon settings, and explicit OOM handling affect JVM shutdown behavior.

JVMJavaOutOfMemoryError

0 likes · 6 min read

Will a JVM Exit When a Thread Runs Out of Memory? Deep Dive with Code

Lobster Programming

Feb 13, 2025 · Backend Development

Zero‑Copy Explained: From write+read to mmap, sendfile and splice

This article breaks down zero‑copy data transfer techniques—write+read, mmap+write, sendfile, sendfile + SG‑DMA, and splice—showing how they reduce CPU copies and context switches to boost I/O performance in modern operating systems.

Data Transferbackendmmap

0 likes · 9 min read

Zero‑Copy Explained: From write+read to mmap, sendfile and splice

Lobster Programming

Feb 10, 2025 · Backend Development

How to Choose the Right Distributed Lock: DB, Redis, or ZooKeeper?

This article explains the concept of distributed locks and compares three common implementation approaches—using a database, Redis, and ZooKeeper—detailing their mechanisms, advantages, drawbacks, and suitable scenarios for ensuring consistent access to shared resources in distributed systems.

ConcurrencyZooKeeperbackend

0 likes · 7 min read

How to Choose the Right Distributed Lock: DB, Redis, or ZooKeeper?

Lobster Programming

Feb 6, 2025 · Mobile Development

How Does One‑Click Mobile Number Login Work? A Deep Dive into the Process

One‑click mobile number login streamlines user authentication by leveraging carrier‑provided phone number masks and tokens, eliminating passwords and verification codes; this article explains the underlying PPP‑based network principles, the multi‑stage token exchange flow, and integration considerations across China’s three major operators.

Mobile DevelopmentToken Flowcarrier integration

0 likes · 7 min read

How Does One‑Click Mobile Number Login Work? A Deep Dive into the Process

Lobster Programming

Feb 2, 2025 · Backend Development

How to Prevent Redis Cache Avalanche, Breakdown, and Penetration

This article explains the three major Redis cache issues—cache avalanche, cache breakdown, and cache penetration—how they can overload databases, and provides practical solutions such as high‑availability deployment, appropriate key expiration, local caches, mutex locks, empty‑object caching, request validation, and Bloom filters.

CacheRedisScalability

0 likes · 5 min read

How to Prevent Redis Cache Avalanche, Breakdown, and Penetration

Lobster Programming

Jan 23, 2025 · Backend Development

How to Implement Secure Auto‑Login with Cookie + Token in Java Spring

This guide explains how to create a seamless auto‑login feature by persisting a token in a cookie after the first successful login, storing the token in Redis, and validating it on subsequent visits, complete with Java Spring code examples.

Auto LoginCookieSpring

0 likes · 5 min read

How to Implement Secure Auto‑Login with Cookie + Token in Java Spring