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Design

openspec/templates/design.md

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Context

<!-- Background and current state. Explain the existing architecture relevant to this change. -->

Goals / Non-Goals

Goals:

  • <!-- What this design aims to achieve -->
  • <!-- Be specific and measurable -->

Non-Goals:

  • <!-- What is explicitly out of scope -->
  • <!-- Helps prevent scope creep -->

Architecture Overview

<!-- High-level architecture diagram or description --> 
┌─────────────────────────────────────────────────────────┐
│                    Component Overview                    │
├─────────────────────────────────────────────────────────┤
│                                                          │
│   ┌────────────┐      ┌────────────┐                   │
│   │ Component  │      │ Component  │                   │
│   │     A      │─────▶│     B      │                   │
│   └────────────┘      └────────────┘                   │
│                                                          │
└─────────────────────────────────────────────────────────┘

Design Decisions

Decision 1: <!-- Decision Title -->

Context:

<!-- What is the issue or decision point -->

Options Considered:

OptionProsCons
Option A<!-- pros --><!-- cons -->
Option B<!-- pros --><!-- cons -->

Decision:

<!-- Which option was chosen and why -->

Consequences:

<!-- What this decision enables or prevents -->

Decision 2: <!-- Decision Title -->

<!-- Repeat as needed -->

Class Design

New Classes

ClassName

<!-- Describe the purpose and responsibilities --> 
public class ClassName {
    // Fields
    private Type field;

    // Public API
    public ReturnType method(ParamType param);

    // Internal methods
    private void internalMethod();
}

Modified Classes

ExistingClassName

<!-- Describe what changes -->
  • New methods:
  • Modified methods:
  • Removed methods:

Filter Chain Integration

<!-- If this change involves filters, document integration points --> 
Filter Chain Flow:
Request → Filter1 → Filter2 → ... → Target → Response
  • New Filter: <!-- Describe if adding a new filter -->
  • Filter Interaction: <!-- How existing filters are affected -->

Thread Safety

<!-- Document thread-safety considerations -->

Concurrent Access Patterns

<!-- How will this code be accessed concurrently -->

Synchronization Strategy

<!-- Locks, atomic operations, thread-local storage, etc. -->

Lock Ordering

<!-- If multiple locks are involved, document ordering -->

Configuration

New Configuration Properties

PropertyTypeDefaultDescription
druid.new.propertyint100Description

Configuration Integration

<!-- How to configure via: -->
  • Properties file
  • Spring Boot application.yml
  • Programmatic configuration

MBean Integration

<!-- If adding monitoring capabilities -->

New MBean Attributes

AttributeTypeDescription
AttributeNamelongDescription

JMX ObjectName

<!-- e.g., com.alibaba.druid:type=DruidDataSource,name=xxx -->

Risks / Trade-offs

Known Risks

RiskMitigation
<!-- risk --><!-- mitigation -->

Trade-offs

Trade-offReason
<!-- trade-off --><!-- reason -->

Migration Guide

<!-- If this change requires migration from existing behavior -->

Breaking Changes

<!-- List breaking changes and migration steps -->

Deprecation Timeline

<!-- If deprecating old behavior, document timeline -->

Testing Strategy

Unit Tests

<!-- What unit tests are needed -->

Concurrency Tests

<!-- How to verify thread safety -->

Benchmark Tests

<!-- Performance benchmarks if applicable -->

Integration Tests

<!-- Database-specific tests if needed -->

Implementation Notes

<!-- Any additional notes for implementers -->