Devuly | Smart Analytics for Developers & Projects

This article focuses on how DTO, DAO, and MVC divide responsibilities in NestJS: DTO handles data shape and validation, DAO handles persistence access, and MVC handles request layering and decoupling. The core problems are object misuse, unclear boundaries, and rising maintenance costs. Keywords: NestJS, DTO, DAO. The Technical Specification Snapshot Parameter Description Language TypeScript Framework/Architecture … Read more

This Django-based second-hand housing data visualization and analytics system centers on listing search, multidimensional chart analysis, personalized recommendations, and house price prediction. It addresses fragmented resale housing information, difficulty in judging prices, and data-poor decision-making. Keywords: Django, ECharts, house price prediction. Technical Specifications Snapshot Parameter Description Primary Languages Python, JavaScript, HTML, CSS Web Framework Django … Read more

Elasticsearch now natively supports Prometheus Remote Write, allowing you to send metrics directly into time series data streams without extra adapters. This creates a unified backend for logs, traces, and metrics, and removes the long-standing split between Prometheus long-term storage and cross-signal analysis. Keywords: Prometheus, Elasticsearch, Remote Write. Technical specifications are easy to summarize Parameter … Read more

This article walks through the full Linux storage path: from data centers, servers, and hard disk drive architecture to tracks, sectors, cylinders, CHS and LBA addressing, block and partition abstractions, and the split design of inodes and data blocks. It addresses the core question of how files are written to disk and how the system … Read more

This article shows how to use ArkTS to implement bottom navigation, multi-page switching, and basic UI polish in OpenHarmony API 20+. It also addresses common issues such as component naming conflicts, type inference problems, and List sizing warnings. Keywords: OpenHarmony, ArkTS, bottom navigation. Technical Specification Snapshot Parameter Value Language ArkTS Platform OpenHarmony / HarmonyOS API … Read more

Kalibr is a high-precision camera-IMU calibration tool for VIO and SLAM. Its core capability is to jointly estimate intrinsics, extrinsics, and temporal offset, helping fix localization drift and unstable mapping caused by multi-sensor spatial and temporal misalignment. Keywords: Kalibr, camera-IMU calibration, ROS. The technical specification snapshot outlines Kalibr at a glance Parameter Details Primary languages … Read more

[AI Readability Summary] Spring resolves circular dependencies in singleton beans by separating instantiation from initialization and exposing early references through a three-level cache. The real reason the third cache level matters is not the circular dependency itself, but the fact that AOP proxy creation happens later than dependency injection. Keywords: Spring, circular dependency, three-level cache. … Read more

The core goal of distributed ID generation is to satisfy global uniqueness, monotonic growth, and high throughput at the same time. This article breaks down the principles, strengths, weaknesses, and production boundaries of Snowflake, segment-based allocation, Leaf, and UidGenerator, with a special focus on clock rollback governance. Keywords: distributed ID, Snowflake algorithm, clock rollback. Technical … Read more

Fireworks Tech Graph is a diagram generation skill built for AI coding agents. Its core capability is turning natural language descriptions into publication-ready SVG+PNG technical diagrams, solving the pain points of time-consuming manual drawing, inconsistent styling, and difficult maintenance. Keywords: AI diagram generation, SVG, Claude Code. The technical specification snapshot shows a production-oriented diagram engine … Read more

This article explains how to connect Spring Boot and Logback directly to Kafka, then use Logstash to write logs into Elasticsearch and search them in Kibana to build a real-time log collection pipeline. It addresses fragmented logs across distributed systems, slow troubleshooting, and weak search capabilities. Keywords: ELK, Kafka, Spring Boot. Technical Specifications Snapshot Parameter … Read more