EventRegistry.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//

using System;

using Deveel.Data.Configuration;

namespace Deveel.Data.Diagnostics {
    public sealed class EventRegistry : ThreadedQueue<IEvent>, IEventRegistry, IDisposable {
        private bool disposed;

        private readonly int threadCount;

        public EventRegistry(IContext context) {
            if (context == null)
                throw new ArgumentNullException("context");

            Context = context;

            var config = context.ResolveService<IConfiguration>();
            threadCount = config.GetInt32("system.events.threadCount", 4);
        }

        ~EventRegistry() {
            Dispose(false);
        }

        public IContext Context { get; private set; }

        public override int ThreadCount {
            get { return threadCount; }
        }

        public void RegisterEvent(IEvent @event) {
            Enqueue(@event);
        }

        protected override void Consume(IEvent message) {
            var routers = Context.ResolveAllServices<IEventRouter>();
            foreach (var router in routers) {
                try {
                    if (router.CanRoute(message))
                        router.RouteEvent(message);
                } catch (Exception ex) {
                    Enqueue(new ErrorEvent(ex, -1, ErrorLevel.Critical));
                }
            }
        }

        protected override void Dispose(bool disposing) {
            if (disposed) {
                Context = null;
                disposed = true;
            }

            base.Dispose(disposing);
        }
    }
}