Professional Wings Documentation

WingsBoot (code WingsGod) is a SpringBoot bootstrap designed to avoid 'magic' and heavy customization. It provides a foundation for small startup teams to evolve from single applications to data sharding, read-write (RW) splitting, and microservices. Key features include:

• Dynamic i18n, timezone, DST, and leap second solutions.
• Data and database versioning for safe table changes and maintenance.
• Robust engineering practices for enums, configurations, and templates.
• Support for non-English naming and industry jargon.
• Traceable, reviewable, and recoverable runtime data changes.

TinyMail is a database-centric mail service built on Spring Mail. It is designed to provide small transaction guarantees and handle common mail provider issues like frequency limits and account locks. Key capabilities include:

• Support for sync/async and single/batch sending.
• Frequency limiting and wait-times based on error types.
• Ability to stop sending based on success status or failure counts.
• Support for multiple email accounts (e.g., domestic and overseas).
• Dry-run mode and filtering by application or runmode.
• Use of business email headers to locate data upon receipt.

The Slardar framework utilizes Hazelcast as middleware for sessions, caching, and messaging. The following components are implemented:

• Session Management: Hazelcast4IndexedSessionRepository (Spring Session)
• Server Cache: WingsHazelcast
• Global Locking: HazelcastGlobalLock
• Global Events: HazelcastSyncPublisher
• ID Generation: FlakeIdHazelcastImpl (Snowflake ID)

Slardar provides a suite of SpringMvc (non-WebFlux) wrappers and extensions for multi-language support, multi-timezone handling, security, caching, and session management. The project is divided into the following modules:

• slardar: Basic features including caching, events, and serialization.
• slardar-hazel-caching: Distributed cache implementation using Hazelcast.
• slardar-hazel-session: Distributed session management using Hazelcast.
• slardar-webmvc: WebMvc, session, and security-web integrations.
• slardar-sprint: Hazelcast, security configuration, admin, and actuator support.
• slardar-test: Testing utilities, including login helpers.

The SilencerCurse module provides a mechanism to dynamically adjust system behavior at runtime using global or thread-level settings. This is achieved by storing parameters in static variables or ThreadLocal storage to provide valid values on demand via the following classes:

• TweakClock: Used for tweaking the system clock.
• TweakLogger: Used for tweaking logging levels (specifically limited to Logback).
• TweakStack: Used for tweaking the stack of CodeException.

Wings implements a cascading and filtering configuration system that allows developers to split configuration items by module, function, or profile. It supports overriding via loading order and disabling specific files via a block-list.

Key concepts:

• Cascading: Sorting by priority; higher priority configurations override lower ones.
• Filtering: Filtering configurations based on the active profile.
• Priority Order: In multi-config scenarios, the processing order is: 1. Profile $\rightarrow$ 2. Path $\rightarrow$ 3. File Sequence (seq) $\rightarrow$ 4. Charset order.

The B4 Execution Engine operates at two context levels which determine how variables and state are handled across evaluations:

• session level: Multiple evaluations within a merge share the same context. Evaluations can influence each other (e.g., the js engine).
• nothing level: No context is associated with each evaluation; there is no influence between separate evaluations (e.g., the sh engine, which depends on bash settings).

Batrider is a lightweight, full-stack microservice solution based on ServiceComb. It consists of the following core modules:

• batrider: Handles basic ServiceComb settings.
• batrider-zero: Provides registry-zero-config functionality.
• batrider-test: Contains testing utilities for both REST and RPC communication.