104 lines
3.2 KiB
C#
104 lines
3.2 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Threading;
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namespace SharpChat.Events {
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public class EventDispatcher : IEventDispatcher {
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private Queue<(object sender, IEvent evt)> EventQueue { get; } = new();
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private object SyncQueue { get; } = new();
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private HashSet<IEventHandler> EventHandlers { get; } = new();
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private object SyncHandlers { get; } = new();
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private HashSet<IEventHandler> PreventDelete { get; } = new();
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private object SyncPrevent { get; } = new();
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private bool IsRunning = false;
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private bool RunUntilEmpty = false;
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private Thread ProcessThread = null;
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[Conditional(@"DEBUG")]
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private static void WithDebugColour(string str, ConsoleColor colour) {
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ConsoleColor prev = Console.ForegroundColor;
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Console.ForegroundColor = colour;
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Logger.Debug(str);
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Console.ForegroundColor = prev;
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}
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public void DispatchEvent(object sender, IEvent evt) {
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lock(SyncQueue) {
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WithDebugColour($@"+ {evt} <- {sender}.", ConsoleColor.Red);
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EventQueue.Enqueue((sender, evt));
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}
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}
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public void AddEventHandler(IEventHandler handler) {
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if(handler == null)
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throw new ArgumentNullException(nameof(handler));
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lock(SyncHandlers)
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EventHandlers.Add(handler);
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}
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internal void ProtectEventHandler(IEventHandler handler) {
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lock(SyncPrevent)
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PreventDelete.Add(handler);
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}
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public void RemoveEventHandler(IEventHandler handler) {
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if(handler == null)
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throw new ArgumentNullException(nameof(handler));
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// prevent asshattery
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lock(SyncPrevent)
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if(PreventDelete.Contains(handler))
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return;
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lock(SyncHandlers)
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EventHandlers.Remove(handler);
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}
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public bool ProcessNextQueue() {
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(object sender, IEvent evt) queued;
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lock(SyncQueue) {
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if(!EventQueue.TryDequeue(out queued))
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return false;
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WithDebugColour($@"~ {queued.evt} <- {queued.sender}.", ConsoleColor.Green);
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}
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lock(SyncHandlers)
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foreach(IEventHandler handler in EventHandlers)
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handler.HandleEvent(queued.sender, queued.evt);
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return true;
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}
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public void StartProcessing() {
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if(IsRunning)
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return;
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IsRunning = true;
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ProcessThread = new Thread(() => {
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bool hadEvent;
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do {
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hadEvent = ProcessNextQueue();
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if(RunUntilEmpty && !hadEvent)
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StopProcessing();
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else
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Thread.Sleep(1);
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} while(IsRunning);
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});
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ProcessThread.Start();
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}
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public void FinishProcessing() {
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RunUntilEmpty = true;
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ProcessThread.Join();
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}
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public void StopProcessing() {
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IsRunning = false;
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RunUntilEmpty = false;
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}
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}
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}
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