Resources and tutorials for programmers' advanced learning journey. Advanced tracks in Java, Python, and C#. Blog: https://blog.csdn.net/badao_liumang_qizhi
This article explains MQ consumption failure retry mechanisms in depth, using a courier analogy, detailing ACK modes, Spring Boot RabbitMQ and Kafka configurations, local vs MQ re‑delivery strategies, dead‑letter queue setup, retry interval policies, exception handling, monitoring tips, and common FAQs.
This article walks through adding a zero‑dependency human‑approval node to a Spring AI YAML‑DSL workflow engine, detailing the problem of critical business decisions, the JDK‑based pause‑and‑resume architecture, step‑by‑step code changes, best‑practice recommendations, and real‑world use cases such as large‑payment and content‑review approvals.
This guide walks you through adding a custom external model such as DeepSeek‑v4, Flash, or Pro to the Qoder AI programming assistant by configuring the provider, entering the Bailei API key, selecting the model, and verifying token usage with screenshots.
This article walks through Qoder's supported external API integration methods, details step‑by‑step MCP configuration, compares three transport protocols, provides multiple concrete configuration examples in Python and Node.js, and offers troubleshooting tips and official resource links for successful API integration.
This article introduces Redisson, a Redis‑based Java client that wraps Redis commands into familiar Java concurrency primitives, compares it with Jedis and Lettuce, explains why custom distributed locks are error‑prone, and provides step‑by‑step code for configuring, using, and integrating its core features such as locks, maps, queues, and rate limiters in Spring Boot.
An online education platform needs to batch‑download course materials from self‑hosted courses, partner APIs, and archived PDFs; the article details a Spring Boot service that aggregates URLs, signs them, distinguishes direct downloads, submits an asynchronous PDF conversion and ZIP packaging task via Feign, and returns a task ID for front‑end polling.
The article explains why sending messages before a Spring transaction commits can cause data inconsistency, and demonstrates how to reliably execute asynchronous actions such as MQ notifications after a successful commit using TransactionSynchronization, custom collectors, and @TransactionalEventListener, while highlighting common pitfalls and mitigation strategies.
The article explains a structured business‑trace logging pattern that records each critical step of a workflow as a node, stores logs in a dedicated MySQL database, aggregates them by a business number, and presents them in a sortable, color‑coded front‑end for both developers and business users.
This article explains unit testing fundamentals, compares unit and integration tests, introduces Mockito's core annotations and APIs, walks through a full order‑resend example with detailed test cases, and covers best‑practice methodologies, advanced techniques, common pitfalls, naming conventions, and how to run the tests.
The article demonstrates how to use Spring Boot and MyBatis-Plus to record user-product visit logs via an atomic INSERT ON DUPLICATE KEY UPDATE upsert, while isolating any remote-call failures through layered try-catch blocks so that logging never disrupts the main product-detail response.
