78 lines
2.8 KiB
C#
78 lines
2.8 KiB
C#
using SharedLibraryCore;
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using SharedLibraryCore.Events;
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using SharedLibraryCore.Interfaces;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading;
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namespace IW4MAdmin.Application
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{
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class GameEventHandler : IEventHandler
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{
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static long NextEventId = 1;
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readonly IManager Manager;
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readonly SortedList<long, GameEvent> OutOfOrderEvents;
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readonly SemaphoreSlim IsProcessingEvent;
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public GameEventHandler(IManager mgr)
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{
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Manager = mgr;
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OutOfOrderEvents = new SortedList<long, GameEvent>();
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IsProcessingEvent = new SemaphoreSlim(1, 1);
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}
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public void AddEvent(GameEvent gameEvent)
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{
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#if DEBUG
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Manager.GetLogger().WriteDebug($"Got new event of type {gameEvent.Type} for {gameEvent.Owner} with id {gameEvent.Id}");
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#endif
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GameEvent sortedEvent = null;
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lock (OutOfOrderEvents)
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{
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sortedEvent = OutOfOrderEvents.Values.FirstOrDefault();
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while (sortedEvent?.Id == Interlocked.Read(ref NextEventId))
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{
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if (OutOfOrderEvents.Count > 0)
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{
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OutOfOrderEvents.RemoveAt(0);
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}
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AddEvent(sortedEvent);
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sortedEvent = OutOfOrderEvents.Values.FirstOrDefault();
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}
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}
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// both the gameEvent Id and the LastEventId are thread safe because we want to synchronize when the
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// event occurs
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if (gameEvent.Id == Interlocked.Read(ref NextEventId))
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{
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((Manager as ApplicationManager).OnServerEvent)(this, new GameEventArgs(null, false, gameEvent));
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#if DEBUG == true
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Manager.GetLogger().WriteDebug($"notified event {gameEvent.Type} for {gameEvent.Owner} with id {gameEvent.Id}");
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#endif
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Interlocked.Increment(ref NextEventId);
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}
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// a "newer" event has been added before and "older" one has been added (due to threads and context switching)
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// so me must wait until the next expected one arrives
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else
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{
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#if DEBUG == true
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Manager.GetLogger().WriteWarning("Incoming event is out of order");
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Manager.GetLogger().WriteDebug($"Expected event Id is {Interlocked.Read(ref NextEventId)}, but got {gameEvent.Id} instead");
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#endif
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// this prevents multiple threads from adding simultaneously
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lock (OutOfOrderEvents)
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{
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if (!OutOfOrderEvents.TryGetValue(gameEvent.Id, out GameEvent discard))
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{
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OutOfOrderEvents.Add(gameEvent.Id, gameEvent);
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}
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}
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}
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}
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}
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}
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