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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using StardewModdingAPI.Events;
using StardewModdingAPI.Framework.PerformanceMonitoring;
namespace StardewModdingAPI.Framework.Events
{
/// <summary>An event wrapper which intercepts and logs errors in handler code.</summary>
/// <typeparam name="TEventArgs">The event arguments type.</typeparam>
internal class ManagedEvent<TEventArgs> : IManagedEvent
{
/*********
** Fields
*********/
/// <summary>The underlying event handlers.</summary>
private readonly List<ManagedEventHandler<TEventArgs>> EventHandlers = new List<ManagedEventHandler<TEventArgs>>();
/// <summary>The mod registry with which to identify mods.</summary>
protected readonly ModRegistry ModRegistry;
/// <summary>Tracks performance metrics.</summary>
private readonly PerformanceMonitor PerformanceMonitor;
/// <summary>The total number of event handlers registered for this events, regardless of whether they're still registered.</summary>
private int RegistrationIndex;
/// <summary>Whether any registered event handlers have a custom priority value.</summary>
private bool HasCustomPriorities;
/// <summary>Whether event handlers should be sorted before the next invocation.</summary>
private bool NeedsSort;
/*********
** Accessors
*********/
/// <summary>A human-readable name for the event.</summary>
public string EventName { get; }
/// <summary>Whether the event is typically called at least once per second.</summary>
public bool IsPerformanceCritical { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="eventName">A human-readable name for the event.</param>
/// <param name="modRegistry">The mod registry with which to identify mods.</param>
/// <param name="performanceMonitor">Tracks performance metrics.</param>
/// <param name="isPerformanceCritical">Whether the event is typically called at least once per second.</param>
public ManagedEvent(string eventName, ModRegistry modRegistry, PerformanceMonitor performanceMonitor, bool isPerformanceCritical = false)
{
this.EventName = eventName;
this.ModRegistry = modRegistry;
this.PerformanceMonitor = performanceMonitor;
this.IsPerformanceCritical = isPerformanceCritical;
}
/// <summary>Get whether anything is listening to the event.</summary>
public bool HasListeners()
{
return this.EventHandlers.Count > 0;
}
/// <summary>Add an event handler.</summary>
/// <param name="handler">The event handler.</param>
/// <param name="mod">The mod which added the event handler.</param>
public void Add(EventHandler<TEventArgs> handler, IModMetadata mod)
{
EventPriority priority = handler.Method.GetCustomAttribute<EventPriorityAttribute>()?.Priority ?? EventPriority.Normal;
var managedHandler = new ManagedEventHandler<TEventArgs>(handler, this.RegistrationIndex++, priority, mod);
this.EventHandlers.Add(managedHandler);
this.HasCustomPriorities = this.HasCustomPriorities || managedHandler.HasCustomPriority();
if (this.HasCustomPriorities)
this.NeedsSort = true;
}
/// <summary>Remove an event handler.</summary>
/// <param name="handler">The event handler.</param>
public void Remove(EventHandler<TEventArgs> handler)
{
this.EventHandlers.RemoveAll(p => p.Handler == handler);
this.HasCustomPriorities = this.HasCustomPriorities && this.EventHandlers.Any(p => p.HasCustomPriority());
}
/// <summary>Raise the event and notify all handlers.</summary>
/// <param name="args">The event arguments to pass.</param>
/// <param name="match">A lambda which returns true if the event should be raised for the given mod.</param>
public void Raise(TEventArgs args, Func<IModMetadata, bool> match = null)
{
// skip if no handlers
if (this.EventHandlers.Count == 0)
return;
// sort event handlers by priority
// (This is done here to avoid repeatedly sorting when handlers are added/removed.)
if (this.NeedsSort)
{
this.NeedsSort = false;
this.EventHandlers.Sort();
}
// raise event
this.PerformanceMonitor.Track(this.EventName, () =>
{
foreach (ManagedEventHandler<TEventArgs> handler in this.EventHandlers)
{
if (match != null && !match(handler.SourceMod))
continue;
try
{
this.PerformanceMonitor.Track(this.EventName, this.GetModNameForPerformanceCounters(handler), () => handler.Handler.Invoke(null, args));
}
catch (Exception ex)
{
this.LogError(handler, ex);
}
}
});
}
/*********
** Private methods
*********/
/// <summary>Get the mod name for a given event handler to display in performance monitoring reports.</summary>
/// <param name="handler">The event handler.</param>
private string GetModNameForPerformanceCounters(ManagedEventHandler<TEventArgs> handler)
{
IModMetadata mod = handler.SourceMod;
return mod.HasManifest()
? mod.Manifest.UniqueID
: mod.DisplayName;
}
/// <summary>Log an exception from an event handler.</summary>
/// <param name="handler">The event handler instance.</param>
/// <param name="ex">The exception that was raised.</param>
protected void LogError(ManagedEventHandler<TEventArgs> handler, Exception ex)
{
handler.SourceMod.LogAsMod($"This mod failed in the {this.EventName} event. Technical details: \n{ex.GetLogSummary()}", LogLevel.Error);
}
}
}
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