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using System;
using System.Collections.Generic;
using System.Linq;
namespace StardewModdingAPI.Framework.Events
{
/// <summary>The base implementation for an event wrapper which intercepts and logs errors in handler code.</summary>
internal abstract class ManagedEventBase<TEventHandler>
{
/*********
** Properties
*********/
/// <summary>A human-readable name for the event.</summary>
private readonly string EventName;
/// <summary>Writes messages to the log.</summary>
private readonly IMonitor Monitor;
/// <summary>The mod registry with which to identify mods.</summary>
private readonly ModRegistry ModRegistry;
/// <summary>The display names for the mods which added each delegate.</summary>
private readonly IDictionary<TEventHandler, IModMetadata> SourceMods = new Dictionary<TEventHandler, IModMetadata>();
/// <summary>The cached invocation list.</summary>
protected TEventHandler[] CachedInvocationList { get; private set; }
/*********
** Public methods
*********/
/// <summary>Get whether anything is listening to the event.</summary>
public bool HasListeners()
{
return this.CachedInvocationList?.Length > 0;
}
/*********
** Protected 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>
protected ManagedEventBase(string eventName, IMonitor monitor, ModRegistry modRegistry)
{
this.EventName = eventName;
this.Monitor = monitor;
this.ModRegistry = modRegistry;
}
/// <summary>Track an event handler.</summary>
/// <param name="handler">The event handler.</param>
/// <param name="invocationList">The updated event invocation list.</param>
protected void AddTracking(TEventHandler handler, IEnumerable<TEventHandler> invocationList)
{
this.SourceMods[handler] = this.ModRegistry.GetFromStack();
this.CachedInvocationList = invocationList?.ToArray() ?? new TEventHandler[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(TEventHandler handler, IEnumerable<TEventHandler> invocationList)
{
this.CachedInvocationList = invocationList?.ToArray() ?? new TEventHandler[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>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(TEventHandler handler, Exception ex)
{
if (this.SourceMods.TryGetValue(handler, out IModMetadata mod))
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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