2022-04-14 13:52:51 +00:00
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// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.EventBus;
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2022-02-10 14:42:21 +00:00
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public partial class InMemoryEventBusSubscriptionsManager : IEventBusSubscriptionsManager
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{
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private readonly Dictionary<string, List<SubscriptionInfo>> _handlers;
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private readonly List<Type> _eventTypes;
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public event EventHandler<string> OnEventRemoved;
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public InMemoryEventBusSubscriptionsManager()
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{
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_handlers = new Dictionary<string, List<SubscriptionInfo>>();
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_eventTypes = new List<Type>();
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}
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public bool IsEmpty => _handlers is { Count: 0 };
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public void Clear() => _handlers.Clear();
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public void AddDynamicSubscription<TH>(string eventName)
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where TH : IDynamicIntegrationEventHandler
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{
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DoAddSubscription(typeof(TH), eventName, isDynamic: true);
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}
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public void AddSubscription<T, TH>()
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where T : IntegrationEvent
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where TH : IIntegrationEventHandler<T>
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{
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var eventName = GetEventKey<T>();
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DoAddSubscription(typeof(TH), eventName, isDynamic: false);
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if (!_eventTypes.Contains(typeof(T)))
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{
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_eventTypes.Add(typeof(T));
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}
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}
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private void DoAddSubscription(Type handlerType, string eventName, bool isDynamic)
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{
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if (!HasSubscriptionsForEvent(eventName))
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{
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_handlers.Add(eventName, new List<SubscriptionInfo>());
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}
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if (_handlers[eventName].Any(s => s.HandlerType == handlerType))
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{
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throw new ArgumentException(
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$"Handler Type {handlerType.Name} already registered for '{eventName}'", nameof(handlerType));
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}
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if (isDynamic)
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{
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_handlers[eventName].Add(SubscriptionInfo.Dynamic(handlerType));
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}
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else
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{
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_handlers[eventName].Add(SubscriptionInfo.Typed(handlerType));
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}
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}
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public void RemoveDynamicSubscription<TH>(string eventName)
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where TH : IDynamicIntegrationEventHandler
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{
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var handlerToRemove = FindDynamicSubscriptionToRemove<TH>(eventName);
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DoRemoveHandler(eventName, handlerToRemove);
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}
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public void RemoveSubscription<T, TH>()
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where TH : IIntegrationEventHandler<T>
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where T : IntegrationEvent
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{
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var handlerToRemove = FindSubscriptionToRemove<T, TH>();
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var eventName = GetEventKey<T>();
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DoRemoveHandler(eventName, handlerToRemove);
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}
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private void DoRemoveHandler(string eventName, SubscriptionInfo subsToRemove)
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{
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if (subsToRemove != null)
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{
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_handlers[eventName].Remove(subsToRemove);
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if (!_handlers[eventName].Any())
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{
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_handlers.Remove(eventName);
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var eventType = _eventTypes.SingleOrDefault(e => e.Name == eventName);
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if (eventType != null)
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{
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_eventTypes.Remove(eventType);
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}
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RaiseOnEventRemoved(eventName);
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}
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}
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}
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public IEnumerable<SubscriptionInfo> GetHandlersForEvent<T>() where T : IntegrationEvent
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{
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var key = GetEventKey<T>();
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return GetHandlersForEvent(key);
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}
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public IEnumerable<SubscriptionInfo> GetHandlersForEvent(string eventName) => _handlers[eventName];
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private void RaiseOnEventRemoved(string eventName)
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{
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var handler = OnEventRemoved;
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handler?.Invoke(this, eventName);
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}
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private SubscriptionInfo FindDynamicSubscriptionToRemove<TH>(string eventName)
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where TH : IDynamicIntegrationEventHandler
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{
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return DoFindSubscriptionToRemove(eventName, typeof(TH));
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}
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private SubscriptionInfo FindSubscriptionToRemove<T, TH>()
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where T : IntegrationEvent
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where TH : IIntegrationEventHandler<T>
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{
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var eventName = GetEventKey<T>();
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return DoFindSubscriptionToRemove(eventName, typeof(TH));
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}
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private SubscriptionInfo DoFindSubscriptionToRemove(string eventName, Type handlerType)
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{
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if (!HasSubscriptionsForEvent(eventName))
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{
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return null;
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}
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return _handlers[eventName].SingleOrDefault(s => s.HandlerType == handlerType);
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}
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public bool HasSubscriptionsForEvent<T>() where T : IntegrationEvent
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{
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var key = GetEventKey<T>();
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return HasSubscriptionsForEvent(key);
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}
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public bool HasSubscriptionsForEvent(string eventName) => _handlers.ContainsKey(eventName);
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public Type GetEventTypeByName(string eventName) => _eventTypes.SingleOrDefault(t => t.Name == eventName);
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public string GetEventKey<T>()
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{
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return typeof(T).Name;
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}
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}
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