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using System;
using System.Collections.Generic;
using System.Linq;
using StardewModdingAPI.Framework.PerformanceCounter;
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.</summary>
private event EventHandler<TEventArgs> Event;
/// <summary>Writes messages to the log.</summary>
private readonly IMonitor Monitor;
/// <summary>The mod registry with which to identify mods.</summary>
protected readonly ModRegistry ModRegistry;
/// <summary>The display names for the mods which added each delegate.</summary>
private readonly IDictionary<EventHandler<TEventArgs>, IModMetadata> SourceMods = new Dictionary<EventHandler<TEventArgs>, IModMetadata>();
/// <summary>The cached invocation list.</summary>
private EventHandler<TEventArgs>[] CachedInvocationList;
/// <summary>Tracks performance metrics.</summary>
private readonly PerformanceMonitor PerformanceMonitor;
/*********
** 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="monitor">Writes messages to the log.</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, IMonitor monitor, ModRegistry modRegistry, PerformanceMonitor performanceMonitor, bool isPerformanceCritical = false)
{
this.EventName = eventName;
this.Monitor = monitor;
this.ModRegistry = modRegistry;
this.PerformanceMonitor = performanceMonitor;
this.IsPerformanceCritical = isPerformanceCritical;
}
/// <summary>Get whether anything is listening to the event.</summary>
public bool HasListeners()
{
return this.CachedInvocationList?.Length > 0;
}
/// <summary>Add an event handler.</summary>
/// <param name="handler">The event handler.</param>
public void Add(EventHandler<TEventArgs> handler)
{
this.Add(handler, this.ModRegistry.GetFromStack());
}
/// <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)
{
this.Event += handler;
this.AddTracking(mod, handler, this.Event?.GetInvocationList().Cast<EventHandler<TEventArgs>>());
}
/// <summary>Remove an event handler.</summary>
/// <param name="handler">The event handler.</param>
public void Remove(EventHandler<TEventArgs> handler)
{
this.Event -= handler;
this.RemoveTracking(handler, this.Event?.GetInvocationList().Cast<EventHandler<TEventArgs>>());
}
/// <summary>Raise the event and notify all handlers.</summary>
/// <param name="args">The event arguments to pass.</param>
public void Raise(TEventArgs args)
{
if (this.Event == null)
return;
this.PerformanceMonitor.Track(this.EventName, () =>
{
foreach (EventHandler<TEventArgs> handler in this.CachedInvocationList)
{
try
{
this.PerformanceMonitor.Track(this.EventName, this.GetModNameForPerformanceCounters(handler), () => handler.Invoke(null, args));
}
catch (Exception ex)
{
this.LogError(handler, ex);
}
}
});
}
/// <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 RaiseForMods(TEventArgs args, Func<IModMetadata, bool> match)
{
if (this.Event == null)
return;
foreach (EventHandler<TEventArgs> handler in this.CachedInvocationList)
{
if (match(this.GetSourceMod(handler)))
{
try
{
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(EventHandler<TEventArgs> handler)
{
IModMetadata mod = this.GetSourceMod(handler);
if (mod == null)
return Constants.GamePerformanceCounterName;
return mod.HasManifest()
? mod.Manifest.UniqueID
: mod.DisplayName;
}
/// <summary>Track an event handler.</summary>
/// <param name="mod">The mod which added the handler.</param>
/// <param name="handler">The event handler.</param>
/// <param name="invocationList">The updated event invocation list.</param>
protected void AddTracking(IModMetadata mod, EventHandler<TEventArgs> handler, IEnumerable<EventHandler<TEventArgs>> invocationList)
{
this.SourceMods[handler] = mod;
this.CachedInvocationList = invocationList?.ToArray() ?? new EventHandler<TEventArgs>[0];
}
/// <summary>Remove tracking for an event handler.</summary>
/// <param name="handler">The event handler.</param>
/// <param name="invocationList">The updated event invocation list.</param>
protected void RemoveTracking(EventHandler<TEventArgs> handler, IEnumerable<EventHandler<TEventArgs>> invocationList)
{
this.CachedInvocationList = invocationList?.ToArray() ?? new EventHandler<TEventArgs>[0];
if (!this.CachedInvocationList.Contains(handler)) // don't remove if there's still a reference to the removed handler (e.g. it was added twice and removed once)
this.SourceMods.Remove(handler);
}
/// <summary>Get the mod which registered the given event handler, if available.</summary>
/// <param name="handler">The event handler.</param>
protected IModMetadata GetSourceMod(EventHandler<TEventArgs> handler)
{
return this.SourceMods.TryGetValue(handler, out IModMetadata mod)
? mod
: null;
}
/// <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(EventHandler<TEventArgs> handler, Exception ex)
{
IModMetadata mod = this.GetSourceMod(handler);
if (mod != null)
mod.LogAsMod($"This mod failed in the {this.EventName} event. Technical details: \n{ex.GetLogSummary()}", LogLevel.Error);
else
this.Monitor.Log($"A mod failed in the {this.EventName} event. Technical details: \n{ex.GetLogSummary()}", LogLevel.Error);
}
}
}
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