DP44/enriched-qwen3-coder-next/DataPRO/Modules/TestSetups/CachedItemsList/Model.md

source_files, generated_at, model, schema_version, sha256

source_files	generated_at	model	schema_version	sha256
DataPRO/Modules/TestSetups/CachedItemsList/Model/CachedItem.cs	2026-04-16T04:52:12.109191+00:00	Qwen/Qwen3-Coder-Next-FP8	1	13d6de34ad0e45b6

Model

1. Purpose

This module defines the CachedItem class, a concrete implementation of the ICachedItem interface, representing metadata for an item stored in a caching layer (likely associated with test setups). It encapsulates the item’s identity (Name, ObjectType), when it was cached (CacheTime), and the timestamp of its last modification in the underlying database (DBTime). Its role is to provide a consistent, immutable snapshot of cached item state for use in UI or business logic that needs to reason about cache freshness and database synchronization.

2. Public Interface

• CachedItem(string name, string objectType, DateTime cacheTime, DateTime dbTime)
  Constructor. Initializes all properties. All parameters are required and stored as read-only values (via private set accessors).
• string Name { get; }
  Read-only property. The logical name of the cached item (e.g., test setup name).
• string ObjectType { get; }
  Read-only property. A string indicating the type of object being cached (e.g., "TestSetup", "Scenario").
• DateTime CacheTime { get; }
  Read-only property. The timestamp when the item was last loaded into the cache.
• DateTime DBTime { get; }
  Read-only property. The timestamp of the item’s last modification in the database. Special semantics: DateTime.MinValue indicates the item no longer exists in the database; any other value is the actual LastModified time from the database.

3. Invariants

• All properties are immutable after construction (private set ensures no external mutation).
• DBTime == DateTime.MinValue is a sentinel value meaning the item is no longer present in the database; all other DBTime values represent valid database timestamps.
• No validation is performed on input parameters (e.g., empty Name or ObjectType is allowed by the constructor).
• CacheTime and DBTime may be equal, but CacheTime is not guaranteed to be ≥ DBTime (no ordering invariant enforced).

4. Dependencies

• Depends on:
  • DTS.Common.Interface.TestSetups.CachedItemsList (specifically, the ICachedItem interface).
  • System (for DateTime).
• Depended on by:
  • Any consumer of the ICachedItem interface (e.g., UI components, cache invalidation logic, comparison services) — inferred from the namespace CachedItemsList.Model and interface implementation.
  • Likely used by modules in TestSetups or CachedItemsList layers (not visible in this file but implied by the namespace structure).

5. Gotchas

• DBTime == DateTime.MinValue is a sentinel, not a valid database timestamp. Misinterpreting this as a real modification time could lead to incorrect assumptions (e.g., treating it as a recent item).
• The class is fully immutable, but callers must be aware that DBTime.MinValue carries special meaning — this is documented only in XML comments, not enforced.
• No equality semantics (Equals, GetHashCode, or IEquatable<T>) are defined; reference equality is used by default.
• No validation on Name or ObjectType — empty strings or null are permitted, which may cause downstream issues if not handled.
• None identified beyond the above.