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refactor(events): 重构PriorityEvent事件处理逻辑
- 将原有的大块switch语句拆分为独立的方法 - 提取TriggerAll、TriggerUntilHandled和TriggerHighest方法 - 新增MergeAndSortHandlers方法用于合并和排序处理器 - 添加GetHighestPriority方法获取最高优先级值 - 分离普通事件处理器和上下文事件处理器的执行逻辑 - 提高代码可读性和维护性
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GeWuYou
gewuyou
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@ -107,94 +107,151 @@ public class PriorityEvent<T> : IEvent
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switch (propagation)
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{
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case EventPropagation.All:
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// 使用快照避免迭代期间修改
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// 合并所有处理器并按优先级排序
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var allHandlersForAll = _handlers
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.Select(h => (h.Priority, Handler: (Action?)(() => h.Handler.Invoke(t)),
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ContextHandler: (Action<EventContext<T>>?)null, IsContext: false))
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.Concat(_contextHandlers
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.Select(h => (h.Priority, Handler: (Action?)null,
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ContextHandler: (Action<EventContext<T>>?)h.Handler, IsContext: true)))
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.OrderByDescending(h => h.Priority)
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.ToList();
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var contextAll = new EventContext<T>(t);
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foreach (var item in allHandlersForAll)
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{
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if (item.IsContext)
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{
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item.ContextHandler?.Invoke(contextAll);
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}
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else
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{
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item.Handler?.Invoke();
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}
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}
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TriggerAll(t);
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break;
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case EventPropagation.UntilHandled:
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// 合并所有处理器并按优先级排序
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var allHandlers = _handlers
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.Select(h => (h.Priority, Handler: (Action?)(() => h.Handler.Invoke(t)),
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ContextHandler: (Action<EventContext<T>>?)null, IsContext: false))
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.Concat(_contextHandlers
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.Select(h => (h.Priority, Handler: (Action?)null,
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ContextHandler: (Action<EventContext<T>>?)h.Handler, IsContext: true)))
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.OrderByDescending(h => h.Priority)
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.ToList();
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var context = new EventContext<T>(t);
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foreach (var item in allHandlers)
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{
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if (item.IsContext)
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{
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item.ContextHandler?.Invoke(context);
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if (context.IsHandled) break;
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}
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else
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{
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item.Handler?.Invoke();
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if (_handled) break; // 保持向后兼容
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}
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}
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TriggerUntilHandled(t);
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break;
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case EventPropagation.Highest:
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// 使用快照避免迭代期间修改
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var normalSnapshot = _handlers.ToArray();
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var contextSnapshot = _contextHandlers.ToArray();
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// 找到最高优先级
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var highestPriority = int.MinValue;
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if (normalSnapshot.Length > 0)
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highestPriority = Math.Max(highestPriority, normalSnapshot[0].Priority);
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if (contextSnapshot.Length > 0)
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highestPriority = Math.Max(highestPriority, contextSnapshot[0].Priority);
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if (highestPriority != int.MinValue)
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{
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// 触发最高优先级的普通处理器
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foreach (var handler in normalSnapshot)
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{
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if (handler.Priority < highestPriority) break;
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handler.Handler.Invoke(t);
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}
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// 触发最高优先级的上下文处理器
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var contextHighest = new EventContext<T>(t);
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foreach (var handler in contextSnapshot)
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{
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if (handler.Priority < highestPriority) break;
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handler.Handler.Invoke(contextHighest);
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}
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}
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TriggerHighest(t);
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break;
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}
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}
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/// <summary>
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/// 触发所有事件处理器（按优先级顺序）
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/// </summary>
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/// <param name="t">事件参数</param>
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private void TriggerAll(T t)
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{
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var allHandlers = MergeAndSortHandlers(t);
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var context = new EventContext<T>(t);
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foreach (var item in allHandlers)
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{
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if (item.IsContext)
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{
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item.ContextHandler?.Invoke(context);
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}
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else
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{
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item.Handler?.Invoke();
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}
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}
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}
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/// <summary>
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/// 触发事件处理器直到被处理
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/// </summary>
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/// <param name="t">事件参数</param>
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private void TriggerUntilHandled(T t)
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{
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var allHandlers = MergeAndSortHandlers(t);
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var context = new EventContext<T>(t);
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foreach (var item in allHandlers)
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{
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if (item.IsContext)
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{
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item.ContextHandler?.Invoke(context);
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if (context.IsHandled) break;
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}
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else
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{
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item.Handler?.Invoke();
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if (_handled) break; // 保持向后兼容
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}
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}
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}
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/// <summary>
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/// 仅触发最高优先级的事件处理器
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/// </summary>
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/// <param name="t">事件参数</param>
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private void TriggerHighest(T t)
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{
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var normalSnapshot = _handlers.ToArray();
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var contextSnapshot = _contextHandlers.ToArray();
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var highestPriority = GetHighestPriority(normalSnapshot, contextSnapshot);
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if (highestPriority != int.MinValue)
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{
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ExecuteHighPriorityNormalHandlers(normalSnapshot, t, highestPriority);
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ExecuteHighPriorityContextHandlers(contextSnapshot, t, highestPriority);
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}
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}
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/// <summary>
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/// 合并并排序所有事件处理器
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/// </summary>
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/// <param name="t">事件参数</param>
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/// <returns>合并排序后的处理器列表</returns>
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private List<(int Priority, Action? Handler, Action<EventContext<T>>? ContextHandler, bool IsContext)>
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MergeAndSortHandlers(T t)
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{
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// 使用快照避免迭代期间修改
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return _handlers
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.Select(h => (h.Priority, Handler: (Action?)(() => h.Handler.Invoke(t)),
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ContextHandler: (Action<EventContext<T>>?)null, IsContext: false))
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.Concat(_contextHandlers
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.Select(h => (h.Priority, Handler: (Action?)null,
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ContextHandler: (Action<EventContext<T>>?)h.Handler, IsContext: true)))
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.OrderByDescending(h => h.Priority)
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.ToList();
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}
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/// <summary>
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/// 获取最高优先级
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/// </summary>
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/// <param name="normalHandlers">普通事件处理器数组</param>
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/// <param name="contextHandlers">上下文事件处理器数组</param>
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/// <returns>最高优先级值</returns>
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private static int GetHighestPriority(EventHandler[] normalHandlers, ContextEventHandler[] contextHandlers)
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{
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var highestPriority = int.MinValue;
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if (normalHandlers.Length > 0)
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highestPriority = Math.Max(highestPriority, normalHandlers[0].Priority);
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if (contextHandlers.Length > 0)
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highestPriority = Math.Max(highestPriority, contextHandlers[0].Priority);
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return highestPriority;
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}
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/// <summary>
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/// 执行高优先级的普通事件处理器
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/// </summary>
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/// <param name="handlers">处理器数组</param>
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/// <param name="t">事件参数</param>
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/// <param name="highestPriority">最高优先级</param>
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private static void ExecuteHighPriorityNormalHandlers(EventHandler[] handlers, T t, int highestPriority)
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{
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foreach (var handler in handlers)
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{
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if (handler.Priority < highestPriority) break;
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handler.Handler.Invoke(t);
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}
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}
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/// <summary>
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/// 执行高优先级的上下文事件处理器
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/// </summary>
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/// <param name="handlers">处理器数组</param>
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/// <param name="t">事件参数</param>
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/// <param name="highestPriority">最高优先级</param>
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private static void ExecuteHighPriorityContextHandlers(ContextEventHandler[] handlers, T t, int highestPriority)
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{
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var context = new EventContext<T>(t);
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foreach (var handler in handlers)
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{
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if (handler.Priority < highestPriority) break;
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handler.Handler.Invoke(context);
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}
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}
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/// <summary>
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/// 事件处理器包装类，包含处理器和优先级
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/// </summary>
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