111 lines
3.6 KiB
Markdown
111 lines
3.6 KiB
Markdown
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# ResourceDependencyGraph
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**命名空间**: `XCEngine::Resources`
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**类型**: `class`
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**描述**: 资源依赖图管理器，负责跟踪资源之间的依赖关系、引用计数和拓扑排序。
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## 概述
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`ResourceDependencyGraph` 维护了所有资源之间的依赖关系图。它支持添加/移除依赖节点、查询依赖关系、循环依赖检测、拓扑排序（用于正确的加载/卸载顺序）等功能。
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## 公共方法
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### 节点管理
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| 方法 | 描述 |
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|------|------|
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| `void AddNode(ResourceGUID guid, ResourceType type)` | 添加依赖节点 |
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| `void RemoveNode(ResourceGUID guid)` | 移除依赖节点 |
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| `bool HasNode(ResourceGUID guid) const` | 检查节点是否存在 |
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### 依赖关系
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| 方法 | 描述 |
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|------|------|
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| `void AddDependency(ResourceGUID owner, ResourceGUID dependency)` | 添加依赖关系（A 依赖 B） |
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| `void RemoveDependency(ResourceGUID owner, ResourceGUID dependency)` | 移除依赖关系 |
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| `Containers::Array<ResourceGUID> GetDependencies(ResourceGUID guid) const` | 获取指定资源的直接依赖列表 |
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| `Containers::Array<ResourceGUID> GetDependents(ResourceGUID guid) const` | 获取依赖指定资源的所有资源列表 |
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| `Containers::Array<ResourceGUID> GetAllDependencies(ResourceGUID guid) const` | 获取所有递归依赖（包括传递依赖） |
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### 引用计数
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| 方法 | 描述 |
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|------|------|
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| `void IncrementRefCount(ResourceGUID guid)` | 增加引用计数 |
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| `void DecrementRefCount(ResourceGUID guid)` | 减少引用计数 |
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| `Core::uint32 GetRefCount(ResourceGUID guid) const` | 获取引用计数 |
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### 循环检测
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| 方法 | 描述 |
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|------|------|
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| `bool HasCircularDependency(ResourceGUID guid, Containers::Array<ResourceGUID>& outCycle) const` | 检测是否存在循环依赖 |
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### 排序与卸载
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| 方法 | 描述 |
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|------|------|
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| `Containers::Array<ResourceGUID> TopologicalSort() const` | 拓扑排序（按依赖顺序） |
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| `bool Unload(ResourceGUID guid)` | 安全卸载（考虑依赖关系） |
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### 清理
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| 方法 | 描述 |
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|------|------|
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| `void Clear()` | 清空所有节点和依赖关系 |
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## DependencyNode 结构体
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| 成员 | 类型 | 描述 |
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|------|------|------|
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| `guid` | `ResourceGUID` | 资源全局唯一标识符 |
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| `type` | `ResourceType` | 资源类型 |
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| `dependencies` | `Containers::Array<ResourceGUID>` | 此资源依赖的其他资源 |
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| `dependents` | `Containers::Array<ResourceGUID>` | 依赖此资源的其他资源 |
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| `refCount` | `Core::uint32` | 引用计数 |
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## 使用示例
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```cpp
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ResourceDependencyGraph graph;
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// 添加节点
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graph.AddNode(textureGuid, ResourceType::Texture);
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graph.AddNode(materialGuid, ResourceType::Material);
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graph.AddNode(shaderGuid, ResourceType::Shader);
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// 设置依赖关系：Material 依赖 Texture 和 Shader
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graph.AddDependency(materialGuid, textureGuid);
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graph.AddDependency(materialGuid, shaderGuid);
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// 查询依赖
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auto deps = graph.GetDependencies(materialGuid);
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// deps 包含 textureGuid 和 shaderGuid
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// 查询被依赖者
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auto dependents = graph.GetDependents(textureGuid);
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// dependents 包含 materialGuid
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// 拓扑排序（正确的加载顺序）
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auto loadOrder = graph.TopologicalSort();
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// loadOrder 保证依赖在目标之前加载
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// 循环依赖检测
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Containers::Array<ResourceGUID> cycle;
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if (graph.HasCircularDependency(guid, cycle)) {
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printf("Circular dependency detected!");
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}
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// 引用计数
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graph.IncrementRefCount(guid);
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graph.DecrementRefCount(guid);
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```
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## 相关文档
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- [ResourceManager](./resources-resourcemanager.md) - 资源管理器
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- [ResourceHandle](./resources-resourcehandle.md) - 资源句柄
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