This guide explains how to build a lightweight circuit‑breaker in Spring 5.3 using a custom @PackFuse annotation and AOP, detailing its purpose, configuration options, state management, and aspect logic, and provides complete Java code examples for annotation, state class, enum, and aspect.
This article explains how to dynamically modify Cron expressions for scheduled tasks in a SpringBoot application by using @EnableScheduling, @Scheduled, custom interfaces, and a refresh mechanism that registers, updates, or disables tasks at runtime without additional middleware.
This article explains how to enable and use the OpenJDK CRaC project with SpringBoot 3.2, covering prerequisites, dependency setup, automatic and manual checkpoint creation, and demonstrates significant startup‑time reductions through detailed examples and performance results.
This article explains the concept, advantages, and three implementation methods of Single Sign-On (SSO), then provides two complete practical examples—including architecture diagrams, step‑by‑step flows, and full Java code for ticket‑based and encrypted data‑based SSO—followed by supplementary RSA key generation notes and a brief promotional note.
The article introduces phpy, an open‑source Swoole project that embeds the Python ecosystem into PHP, explains its features, provides detailed compilation and installation steps, demonstrates usage through code examples—including AI libraries, GUI creation, named arguments, and callbacks—and shares real‑world sample applications.
This article explains the concept of idempotency, presents several strategies to achieve it, and provides a complete Spring Boot implementation using Redis, a custom @AutoIdempotent annotation, token generation and verification, interceptor configuration, and test cases to ensure only the first request succeeds.
This article explains PHP's fwrite() function, its syntax and parameters, and provides clear code examples for writing strings and serialized arrays to files, while highlighting important considerations such as file opening modes and data types.
This article explains the PHP rmdir() function, its syntax, parameters, return values, important usage notes, and provides a complete code example that checks for a directory's existence before safely removing an empty folder.
This article explains two PHP routing strategies—an original path‑based method that maps URL segments to controller and action names, and a more flexible regular‑expression based method that uses pattern matching for complex URL structures—providing code examples and guidance on when to use each.
This guide explains how to use Spring Boot configuration files and runtime APIs to change log levels on the fly, covering basic log level concepts, a practical controller example, dynamic endpoint implementation, disabling logs, and Spring Cloud integration for flexible logging management.
This article explains the PHP fwrite() function, its syntax, parameters, and provides clear examples for writing strings and serialized arrays to files, highlighting proper file opening modes and error handling.
This article explains how the PHP tempnam() function creates unique temporary file names, describes its syntax, parameters, return values, and provides two practical code examples demonstrating usage with optional directory and prefix settings.
This article outlines nine practical microservices best practices—from applying the Single Responsibility Principle and forming cross‑functional teams to using proper DevSecOps tools, asynchronous communication, independent data stores, and robust monitoring—to help developers design scalable, maintainable, and secure backend architectures.
This article explains how Kafka’s design uses the operating system’s page cache and sequential disk writes to achieve fast, reliable persistence, debunking the myth that disk I/O is inherently slow and outlining practical configuration tips.
The article introduces the second version of phpy, a PHP extension that embeds a Python interpreter, explains its dual‑VM runtime architecture, shows how to use it under PHP‑FPM, presents detailed performance benchmarks, covers exception handling, IDE auto‑completion, compilation options, dynamic‑library troubleshooting, and provides numerous code examples for testing and scientific computing.
The article explains the purpose and syntax of PHP's fseek() function, details its parameters—including file, offset, and whence options such as SEEK_SET, SEEK_CUR, and SEEK_END—provides a complete example demonstrating file opening, pointer positioning, reading, writing, and closing operations.
This article explains the PHP htmlspecialchars() function, its syntax and parameters, demonstrates how to escape special characters, quotes, and specify encoding or disable double‑encoding, and shows how it helps prevent XSS attacks in web applications.
This tutorial explains how to create a MySQL database on a Linux system using PHP's mysqli extension, covering prerequisite installations, establishing a connection to the MySQL server, and executing SQL statements to create the database, with complete code examples and instructions for customizing credentials.
This article explains the core concepts, architecture, and implementation details of the lightweight distributed scheduling platform Xxl-Job, including its scheduler center, executor, job handlers, registration, task triggering, routing strategies, execution flow, and result callbacks, with a step‑by‑step demo and code examples.
This article explains how PHP developers can improve network communication efficiency and overall application performance by using output buffering, GZIP compression, HTTP caching headers, and asynchronous curl_multi functions for concurrent requests.
This article explains how to use the MyBatis @MapKey annotation to map query results into a Java Map, provides a concrete code example, and delves into the internal processing steps—including MapperProxy, MapperMethod, MethodSignature, and DefaultMapResultHandler—that enable this functionality.
This article details Baidu's search display service evolution, outlining its original C and PHP/HHVM implementation, the three major challenges of high development difficulty, limited architecture capability, and low reusability, and presents a comprehensive solution using a graph execution engine, common operators, and a phased migration to Go.
This article explains how to redesign a Java data model so that a single sessionId is stored at the outer level while multiple sceneId/sceneName pairs are nested inside a sceneList, and shows the required MyBatis mapper, XML mapping, service, and controller implementations.
This guide explains how Spring Boot 3.2 leverages the OpenJDK CRaC project to create and restore JVM checkpoints, dramatically reducing application startup time through automatic and manual checkpoint techniques, complete with required dependencies, installation steps, and performance results.
This article explains how to mask sensitive fields in Java logs, demonstrates the pitfalls of shallow‑copying nested Maps during masking, and shows a robust solution using Guava's Maps.transformEntries to perform lazy, view‑based deep transformation without mutating the original data structures.
This article explains how to build a custom dynamic data‑source solution for Spring Boot by leveraging ThreadLocal and AbstractRoutingDataSource, provides complete Java code for context holders, routing datasource, configuration, annotation‑driven switching, and runtime addition of new data sources.
This article explains how Cloudflare replaced NGINX with Pingora, a Rust‑written HTTP proxy that processes over a trillion daily requests, offering superior performance, efficiency, and security through a multithreaded design, custom HTTP library, and programmable request lifecycle.
This article walks through implementing EasyCache, a Go‑based in‑memory cache with sharding, lock‑free concurrency, LRU eviction, and configurable expiration, explaining the underlying data structures, goroutine cleanup logic, and key handling with concrete code examples.
This article explains how to improve PHP logging performance by controlling log levels, batching writes, using asynchronous processes, and implementing log rotation, providing clear code examples for each technique in real-world PHP applications.
The article explains why large database transactions degrade backend API performance, outlines issues such as data inconsistency, lock contention, and log overhead, and presents practical optimization techniques including avoiding RPC inside transactions, using programmatic transactions, batch processing, splitting into smaller transactions, and asynchronous parallel execution with CompletableFuture.
This article explains the underlying principles and step‑by‑step configuration for integrating Spring Boot with MyBatis to manage multiple data sources, covering BeanFactory, FactoryBean, SqlSessionFactoryBean setup, datasource properties, mapper scanning, and sample controller code for accessing distinct databases.
This article explains why heartbeat detection is crucial for WebSocket connections, describes the underlying Ping/Pong mechanism, details server and client configuration parameters, and provides complete code examples for implementing reliable heartbeat and reconnection logic.
This article explains the OSI seven‑layer model, the mechanics of TCP three‑way handshake and four‑way termination, differences between TCP and UDP, long‑living socket connections, custom protocol design, and how to implement a socket connection pool for high‑concurrency backend services.
This guide explains how to design group and private chat messages, define a unified JSON protocol, validate payloads with a custom validator, and implement WebSocket callbacks (onWorkerStart, onWebSocketConnect, onMessage, onClose) using PHP and JavaScript client examples for both one‑to‑one and group conversations.
This article introduces the PowerJob distributed task framework, explains why it was chosen, details its architecture and high‑availability design, demonstrates various job types—including standalone, broadcast, map, and map‑reduce—with Java code examples, and covers scheduling options such as CRON, fixed‑rate, and fixed‑delay execution.
This article explains the syntax and parameters of PHP's file_get_contents() function, provides example code for reading both local and remote files, and highlights important usage notes for efficiently retrieving file contents in backend development.
This article demonstrates how to enable and use Coordinated Restore at Checkpoint (CRaC) in Spring Boot 3.2 with the Spring Petclinic example, covering required dependencies, JVM setup, automatic and manual checkpoint creation, performance measurements, and best‑practice considerations for backend developers.
This article explains PHP's shuffle() function, its syntax, behavior, return value, and demonstrates how it randomizes both indexed and associative arrays with code examples, highlighting that it modifies the original array and reindexes non‑sequential keys.
This article explains PHP's strlen() function, covering its syntax, usage examples for measuring string length with and without surrounding spaces, important encoding considerations, and provides learning resources for further in PHP development.
This article examines the challenges of a tightly coupled retail product system and proposes a domain‑driven, micro‑service architecture that decouples business units, introduces unified domain models, and enables flexible, scalable solutions for both retail and catering operations.
A Java backend developer investigates why an enum‑based status field becomes an empty string during database insertion, tracing the issue through code inspection, Arthas watches, and ultimately discovering a mis‑implemented enum setter caused by a third‑party library.
This article explains how the team transformed a Go‑based microservice recommendation system into a single‑pod monolithic application using tRPC‑Go, detailing performance bottlenecks, code‑level mock‑proxy techniques, deployment adjustments, and the resulting dramatic reduction in CPU consumption.
This article demonstrates how to build a real-time equipment monitoring solution by using WebSocket for server‑client communication, a Vue.js front‑end to display device status on a map, and a SpringBoot back‑end that broadcasts abnormal alerts to connected browsers.
This article explains how asynchronous programming and event‑driven mechanisms work in both frontend JavaScript and backend Golang, covering the JavaScript event loop, macro‑ and micro‑tasks, goroutine‑based concurrency, and the kernel‑level epoll architecture that together enable efficient, non‑blocking execution.
This article explains why caching is crucial for Spring Boot applications, examines its impact on microservice architectures, outlines criteria for selecting the right cache—usability, speed, availability, observability—and compares local, distributed, and hierarchical caches with practical strategies and code examples.
This article analyzes the current store system issues, outlines various refactoring types and their difficulties, presents common efficiency measures, and details testing schemes for both unchanged‑business and changed‑business refactoring cases, highlighting objectives, challenges, processes, and overall effectiveness.
The article describes the background, pain points, and detailed design of the Xinge messaging platform, including decoupling of messages, lifecycle management, rate‑limiting strategies, template usage, and future enhancements to provide a unified, reliable backend service for business notifications.
This article explains PHP's built‑in array() function, demonstrating how to create both indexed and associative arrays with clear examples, code snippets, and important usage notes for developers. It also covers mixed and nested arrays, parameter rules, and common pitfalls to help you write robust PHP code.
This article explains the PHP is_float() function, covering its syntax, behavior, and practical code examples that demonstrate how to check whether variables are floating‑point numbers and handle related conditional logic.
Facing uncontrolled log proliferation, the author shares a real-world case of log governance that reduces costs and boosts efficiency by categorizing logs, simplifying formats, consolidating tools, introducing a three‑layer log architecture, and applying stack‑trace reversal techniques with concrete code examples.
This article outlines ten practical REST API design guidelines—including meaningful resource naming, proper HTTP methods and status codes, versioning, consistent error handling, query parameters, authentication, statelessness, and thorough documentation—to help developers build robust, scalable backend services.
The article presents a collection of typical Java backend coding mistakes—ranging from misused ternary operators and poor parameter validation to logging pitfalls, dead code, improper exception handling, AOP self‑invocation issues, Redis resilience problems, and Excel file upload bugs—along with concrete examples, images, and corrected code snippets to help developers avoid and fix them.
This article explains PHP's in_array() function, detailing its syntax, parameters, and return values, and provides multiple code examples demonstrating basic usage, strict type comparison, and practical tips for efficiently checking the presence of values in arrays.
This article explains how to install the pthreads extension for PHP and demonstrates three approaches—try‑catch blocks, shared variables, and logging—to capture and propagate errors from worker threads back to the main thread, ensuring stable multithreaded applications.
phpy is an open‑source Swoole project that lets PHP import and use Python packages—including popular AI and scientific libraries—by providing a PHP extension or a Python C module, with detailed installation steps, usage examples, and support for callbacks and named parameters.
This article explains how to design and refactor a Java rule engine that supports short‑circuit AND/OR logic, demonstrates the abstraction of rules, shows concrete implementations, and provides a chainable service for executing combined rule sets with example code.
This article analyzes the problem of scattered try‑catch blocks in Java services, explains why per‑controller exception methods are cumbersome, and presents a unified exception handling solution using @ControllerAdvice, custom Assert utilities, enum‑based error codes, and environment‑aware response formatting, all illustrated with concrete code examples and test results.
This article recounts three production‑level pagination bugs encountered in a payment system, explains why they occurred—ranging from naive batch processing to MySQL's nondeterministic LIMIT behavior—and shows how proper pagination, ThreadLocal cleanup, and deterministic ordering resolve the issues.
This article presents a Java-based rule engine design that separates rule definitions, data transfer objects, and execution logic, demonstrating AND/OR composition, abstract rule templates, concrete implementations, and a fluent API for building and executing complex rule chains.
This article explains the PHP str_word_count() function, its syntax, parameters, and provides multiple code examples showing how to count words, retrieve word arrays, obtain word positions, customize ignored characters, and use regular expressions for word matching.
This article explains PHP's json_decode() function, detailing its purpose, required and optional parameters, and provides a complete code example that demonstrates decoding a JSON string into an associative array and iterating over its contents.
This article presents a concise tutorial on building a flash‑sale (Seckill) system with SpringBoot, MySQL, Redis, RabbitMQ and a basic HTML/JQuery front‑end, covering architecture, key features, code snippets, over‑selling prevention, rate limiting, and deployment screenshots.
This article explains why introducing a cache improves read performance as traffic grows, compares different cache‑database consistency approaches, analyzes their pros and cons in concurrent scenarios, and recommends using the "update database then delete cache" pattern with message queues or change‑log subscriptions to maintain data integrity.
The article examines the reasons behind mandating POST for every API endpoint, compares GET and POST characteristics, discusses RESTful principles, highlights practical pros and cons, and offers guidance on choosing the most suitable HTTP method based on business and technical considerations.
This article examines seven typical messaging scenarios—ordinary, ordered, delayed, transactional, trace, dead‑letter, and priority messages—explaining the problem each solves, the trade‑offs, and concrete implementations in RocketMQ, Pulsar, RabbitMQ and Kafka with code samples.
This article explains the recent correction in Alibaba's developer manual that replaces the ambiguous "expansion count" of HashMap with the precise "resize count", details the conditions under which HashMap triggers resize during the first put operation, and shows why storing 1024 elements in JDK 1.8 results in eight resize calls.
This article explains how the PHP file_exists() function works, its syntax, return values, usage examples for local and remote files as well as directories, and important considerations when employing it in backend development.
This article demonstrates how to build a real‑time equipment monitoring application by using WebSocket for server‑client communication, a Vue.js front‑end to display device status, and a SpringBoot back‑end that broadcasts alerts when abnormal devices are reported.
This guide walks you through downloading, extracting, configuring, compiling, and installing the phpRedis C extension for PHP 7.4, shows how to enable it in php.ini, and provides commands to verify that the Redis extension is loaded correctly.
This article explains how to use Apache Commons GenericObjectPool to implement a reusable process pool in Java, covering the underlying concepts, required dependencies, custom factory implementation, pool configuration, and example code for borrowing and returning pooled objects.
This article explains PHP's dirname() function, detailing its syntax, parameters, return values, and providing four practical code examples that demonstrate extracting directory paths from absolute, relative, and Windows-style file paths, as well as handling paths that are already directories.
This article explains PHP's ceil() function, detailing its syntax, parameters, and behavior for rounding numbers upward, and provides three clear code examples demonstrating its use with positive, negative, and integer values, along with the expected output for each case.
This article explains how PHP developers can use generators to iterate over large data sets without exhausting memory, covering the concept, syntax with the yield keyword, step‑by‑step examples, converting regular functions, handling key‑value pairs, sending data back, returning values, and a real‑world file‑reading use case.
This article explains the PHP file_put_contents() function, its syntax, parameters, return values, and provides practical examples for writing strings, appending data, writing arrays, and using callbacks to dynamically generate file content.
This article explains PHP's is_callable() function, describing its purpose, parameter options, and how to use it to verify the callability of functions and class methods, accompanied by clear code examples and a discussion of its benefits for robust, maintainable code.
This article details the design, challenges, and monitoring strategies of Alibaba's travel billing system, explaining how a modular backend architecture, multi‑way reconciliation, full‑link monitoring, and a configurable expression engine enable near‑perfect bill accuracy and automated settlement for enterprise customers.
This guide explains how to configure Nginx to forward the original client IP using X-Real-IP or X-Forwarded-For headers and provides Java servlet code to reliably extract that IP on the backend.
This article explains PHP's implode() function, covering its syntax, parameters, return value, basic usage examples, and common application scenarios such as constructing SQL IN clauses and concatenating user-selected options for web development.
This article introduces multiple Java approaches for sending HTTP GET and POST requests, covering the built‑in HttpURLConnection class, Apache HttpClient, Square's OkHttp, and Spring's RestTemplate, with step‑by‑step explanations and complete code examples for each method.
The article introduces PHP 8.3’s major enhancements—including typed class constants, dynamic class constant access, deep‑clone support for readonly properties, and the new json_validate() function—while noting the upcoming end of PHP 8.0 support and providing practical code examples.
This article introduces Python coroutines and asynchronous programming using the asyncio module, explains key concepts such as event loops and non‑blocking I/O, and provides ten detailed code examples that demonstrate creating, managing, and synchronizing async tasks for improved performance.
This guide explains how to implement a dynamic feature‑toggle for Spring Boot API endpoints using custom annotations, resolver interfaces, and an AOP aspect, enabling flexible control, safety, logging, monitoring, and user‑friendly fallback responses.
This comprehensive guide walks you through Go structs—covering their definition, instantiation, methods, receivers, anonymous fields, embedding, and method expressions—while providing clear code examples and practical guidelines for effective use in Go programming.
PHP 8.3 introduces a JIT compiler, enhanced array and string handling, OPcache improvements, and Match expressions, delivering significant performance gains and offering optimization strategies while highlighting common pitfalls to ensure efficient, maintainable backend development.
This article explains the PHP glob() function, detailing its syntax, parameters, and multiple usage examples—including listing all files, filtering by extension, recursive file discovery, and directory-only searches—while providing complete code snippets for each scenario.
This article provides a comprehensive guide to designing and implementing a unified exception handling framework in Spring Boot, covering the use of @ControllerAdvice, custom assertion interfaces, enum‑based error codes, standardized response structures, and practical testing scenarios to improve code readability and robustness.
This article introduces a WeChat mini‑program for habit tracking that combines PHP‑MySQL backend services with a UniApp‑based front‑end, detailing its habit‑check‑in, focus‑training features, custom calendar UI styling, and chart integration for statistical visualization.
This article explains how to use PHP's built‑in network functions, such as file_get_contents() and curl(), to send GET and POST HTTP requests, retrieve responses, and choose the appropriate method for remote data transmission in backend development.
This article outlines key guidelines for developing maintainable ThinkPHP applications, covering framework design principles, directory structure, naming conventions, error handling, caching, performance optimization, test‑driven development, and effective team collaboration with version control.
PHP 8.3, released on November 23 2023, introduces numerous backend enhancements such as improved readonly class cloning, typed class constants, the #[Override] attribute, negative array indexes, anonymous readonly classes, new functions like json_validate and mb_str_pad, Randomizer upgrades, and refined error handling, all aimed at boosting developer productivity.
A developer shares insights from a game company interview, explaining why microservice architectures often clash with the low‑latency, state‑heavy requirements of real‑time multiplayer games and when they might still be appropriate.
This article compares traditional Linux crontab with the PHP‑based Workerman Crontab, highlighting crontab's high‑availability, load‑balancing, and permission limitations, and demonstrating how Workerman Crontab offers second‑level precision, dynamic management, distributed deployment, and superior performance for modern task scheduling needs.
This article shares practical experiences and detailed technical solutions for applying Domain‑Driven Design, Clean (Onion) Architecture, CQRS, and Saga patterns in backend systems, covering theory recap, modeling methods, module separation, code examples, and distributed transaction strategies.
This article provides a detailed walkthrough of a typical microservice architecture, covering entry traffic with Nginx, gateway selection, business service design, service registry options, caching and distributed locks with Redis, data persistence strategies, structured data storage, messaging middleware, log collection, task scheduling, and distributed object storage, while also promoting related community resources.
This article explores how Kafka serves as a versatile backbone for messaging, durable storage, log aggregation, monitoring, commit logs, recommendation pipelines, stream processing, CDC, system migration, and event sourcing, highlighting its performance, reliability, and practical deployment patterns.
To support rapid overseas expansion, the article outlines a comprehensive backend architecture—including management, data ingestion, device tracking, attribution, and offline tasks—while detailing fine-grained user permission controls, automated product onboarding, batch ad creation, and server‑side attribution workflows, plus future enhancements.
This article explains how to use Celery together with Redis to manage and execute periodic and asynchronous tasks in Python, covering basic concepts, architecture, configuration steps, single‑worker and multi‑worker setups, distributed processing strategies, and practical considerations for reliable task execution.
This article presents a concise reference of Spring's Assert class, common ObjectUtils, StringUtils, CollectionUtils, file and stream copy helpers, as well as ReflectionUtils and AOP utilities, illustrating their purpose, typical usage scenarios, and providing ready‑to‑copy code snippets for Java backend development.
PHP 8.3 introduces a range of backend enhancements—including explicit typed class constants, dynamic constant access, the #[\Override] attribute, deep‑clone support for readonly properties, a new json_validate() function, and expanded Randomizer methods—plus numerous new DOM, Intl, LDAP, and POSIX functions, while deprecating several legacy features.
This article explains the principles of distributed tracing, the OpenTracing standard, SkyWalking's architecture and sampling strategies, and shares practical company implementations and custom plugins that help locate performance bottlenecks in micro‑service systems.
