EventConsumer.cs

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using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Tgstation.Server.Host.Components.StaticFiles;
using Tgstation.Server.Host.Components.Watchdog;

namespace Tgstation.Server.Host.Components.Events
{
    sealed class EventConsumer : IEventConsumer
    {
        readonly IConfiguration configuration;

        IWatchdog watchdog;

        public EventConsumer(IConfiguration configuration)
        {
            this.configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
        }

        public async Task HandleEvent(EventType eventType, IEnumerable<string> parameters, CancellationToken cancellationToken)
        {
            if (watchdog == null)
                throw new InvalidOperationException("EventConsumer used without watchdog set!");

            await configuration.HandleEvent(eventType, parameters, cancellationToken).ConfigureAwait(false);
            await watchdog.HandleEvent(eventType, parameters, cancellationToken).ConfigureAwait(false);
        }

        public void SetWatchdog(IWatchdog watchdog)
        {
#pragma warning disable IDE0016 // Use 'throw' expression
            if (watchdog == null)
                throw new ArgumentNullException(nameof(watchdog));
#pragma warning restore IDE0016 // Use 'throw' expression
            if (this.watchdog != null)
                throw new InvalidOperationException("watchdog already set!");
            this.watchdog = watchdog;
        }
    }
}