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InProcessServiceBus.cs
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InProcessServiceBus.cs
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using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using ServiceAnt.Handler;
using ServiceAnt.Handler.Request;
using ServiceAnt.Handler.Subscription.Handler;
using ServiceAnt.Request.Handler;
using ServiceAnt.Subscription;
using System;
using System.Linq;
using System.Threading.Tasks;
namespace ServiceAnt
{
/// <summary>
/// The implement that work in-process
/// </summary>
public class InProcessServiceBus : IServiceBus
{
private ISubscriptionManager _subcriptionManager;
private IRequestHandlerManager _requestHandlerManager;
/// <summary>
/// Use to log message of bus
/// </summary>
public event Action<string, string, Exception> OnLogBusMessage;
private static Lazy<InProcessServiceBus> _defaultInstance = new Lazy<InProcessServiceBus>();
/// <summary>
/// Default Instance
/// </summary>
public static InProcessServiceBus Default => _defaultInstance.Value;
/// <summary>
/// Constructor
/// </summary>
public InProcessServiceBus()
{
_subcriptionManager = new InMemorySubscriptionsManager();
_requestHandlerManager = new InMemoryRequestHandlerManager();
}
/// <summary>
/// It used to inject mock object
/// </summary>
/// <param name="subcriptionManager"></param>
/// <param name="requestHandlerManager"></param>
public InProcessServiceBus(ISubscriptionManager subcriptionManager, IRequestHandlerManager requestHandlerManager)
{
_subcriptionManager = subcriptionManager;
_requestHandlerManager = requestHandlerManager;
}
#region Pub/Sub
/// <summary>
/// Add Subscription for event by delegate with dynamic parameter
/// </summary>
/// <param name="eventName">the name of event(the class name of event type)</param>
/// <param name="action">Handler delegate</param>
public void AddDynamicSubscription(string eventName, Func<dynamic, Task> action)
{
_subcriptionManager.AddDynamicSubscription(eventName, action);
}
/// <summary>
/// Add Subscription for event by factory
/// </summary>
/// <param name="eventType">The type of event must inherit TransportTray</param>
/// <param name="factory">The factory of handler</param>
public void AddSubscription(Type eventType, IHandlerFactory factory)
{
_subcriptionManager.AddSubscription(eventType, factory);
}
/// <summary>
/// Add Subscription for event by delegate
/// </summary>
/// <typeparam name="TEvent">The event must inherit TransportTray</typeparam>
/// <param name="action">Handler delegate</param>
public void AddSubscription<TEvent>(Func<TEvent, Task> action) where TEvent : TransportTray
{
_subcriptionManager.AddSubscription<TEvent>(action);
}
/// <summary>
/// Add Subscription for event by factory
/// </summary>
/// <typeparam name="TEvent">The event must inherit TransportTray </typeparam>
/// <param name="factory"></param>s
public void AddSubscription<TEvent>(IHandlerFactory factory) where TEvent : TransportTray
{
_subcriptionManager.AddSubscription<TEvent>(factory);
}
/// <summary>
/// Remove subscription from servicebus
/// </summary>
/// <param name="eventName">the name of event(the class name of event type)</param>
/// <param name="action">Handler delegate</param>
public void RemoveDynamicSubscription(string eventName, Func<dynamic, Task> action)
{
_subcriptionManager.RemoveDynamicSubscription(eventName, action);
}
/// <summary>
/// Remove subscription from servicebus
/// </summary>
/// <typeparam name="TEvent">The event must inherit TransportTray</typeparam>
/// <param name="action">Handler delegate</param>
public void RemoveSubscription<TEvent>(Func<TEvent, Task> action) where TEvent : TransportTray
{
_subcriptionManager.RemoveSubscription<TEvent>(action);
}
/// <summary>
/// Publish a event
/// </summary>
/// <param name="event"></param>
/// <returns></returns>
public Task Publish(TransportTray @event)
{
var asyncTask = ProcessEvent(_subcriptionManager.GetEventName(@event.GetType()), JsonConvert.SerializeObject(@event));
return asyncTask;
}
/// <summary>
/// Publish a event sync
/// </summary>
/// <param name="event"></param>
public void PublishSync(TransportTray @event)
{
var asyncTask = ProcessEvent(_subcriptionManager.GetEventName(@event.GetType()), JsonConvert.SerializeObject(@event));
asyncTask.Wait();
}
private async Task ProcessEvent(string eventName, string message)
{
var handlerFactories = _subcriptionManager.GetHandlerFactoriesForEvent(eventName);
foreach (var aHandlerFactory in handlerFactories)
{
try
{
var aHandler = aHandlerFactory.GetHandler();
if (aHandler is IDynamicEventHandler)
{
dynamic eventData = JObject.Parse(message);
await ((IDynamicEventHandler)aHandler).HandleAsync(eventData);
}
else
{
var subscriptionParamType = aHandlerFactory.GetLocalEventType();
if (subscriptionParamType != null)
{
var integrationEvent = JsonConvert.DeserializeObject(message, subscriptionParamType);
var concreteType = typeof(IEventHandler<>).MakeGenericType(subscriptionParamType);
await (Task)concreteType.GetMethod("HandleAsync").Invoke(aHandler, new object[] { integrationEvent });
}
}
aHandlerFactory.ReleaseHandler(aHandler);
}
catch (Exception ex)
{
LogMessage( "error", "There has raised a error when publishing event.", ex);
}
}
}
#endregion
#region Req/Resp
/// <summary>
/// Register handler with handler factory
/// </summary>
/// <param name="eventType"></param>
/// <param name="factory"></param>
public void AddRequestHandler(Type eventType, IHandlerFactory factory)
{
_requestHandlerManager.AddRequestHandler(eventType, factory);
}
/// <summary>
/// Register handler with handler factory
/// </summary>
/// <typeparam name="TEvent"></typeparam>
/// <param name="factory"></param>
public void AddRequestHandler<TEvent>(IHandlerFactory factory)
where TEvent : TransportTray
{
_requestHandlerManager.AddRequestHandler<TEvent>(factory);
}
/// <summary>
/// Register handler with delegate
/// </summary>
/// <typeparam name="TEvent"></typeparam>
/// <param name="action"></param>
public void AddRequestHandler<TEvent>(Func<TEvent, IRequestHandlerContext, Task> action)
where TEvent : TransportTray
{
_requestHandlerManager.AddRequestHandler<TEvent>(action);
}
/// <summary>
/// Register dynamic handler with delegate
/// </summary>
/// <param name="eventName"></param>
/// <param name="action"></param>
public void AddDynamicRequestHandler(string eventName, Func<dynamic, IRequestHandlerContext, Task> action)
{
_requestHandlerManager.AddDynamicRequestHandler(eventName, action);
}
/// <summary>
/// Remove handler by event type
/// </summary>
/// <typeparam name="TEvent"></typeparam>
/// <param name="action"></param>
public void RemoveRequestHandler<TEvent>(Func<TEvent, IRequestHandlerContext, Task> action)
where TEvent : TransportTray
{
_requestHandlerManager.RemoveRequestHandler(action);
}
/// <summary>
/// Remove dynamic handler by eventName
/// </summary>
/// <param name="eventName"></param>
/// <param name="action"></param>
public void RemoveDynamicRequestHandler(string eventName, Func<dynamic, IRequestHandlerContext, Task> action)
{
_requestHandlerManager.RemoveDynamicRequestHandler(eventName, action);
}
/// <summary>
/// Send a request sync
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="event"></param>
/// <returns></returns>
public T Send<T>(TransportTray @event)
{
var asyncTask = ProcessRequest<T>(_requestHandlerManager.GetRequestName(@event.GetType()), JsonConvert.SerializeObject(@event));
asyncTask.ConfigureAwait(false);
return asyncTask.Result;
}
/// <summary>
/// Send a request async
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="event"></param>
/// <returns></returns>
public async Task<T> SendAsync<T>(TransportTray @event)
{
return await ProcessRequest<T>(_requestHandlerManager.GetRequestName(@event.GetType()), JsonConvert.SerializeObject(@event));
}
private async Task<T> ProcessRequest<T>(string eventName, string message)
{
var handlerFactories = _requestHandlerManager.GetHandlerFactoriesForRequest(eventName);
var requestContext = new RequestHandlerContext();
if (handlerFactories.Count == 0)
return default(T);
foreach (var aHandlerFactory in handlerFactories)
{
if (requestContext.IsEnd)
break;
try
{
var aHandler = aHandlerFactory.GetHandler();
if (aHandler is IDynamicRequestHandler)
{
dynamic eventData = JObject.Parse(message);
await ((IDynamicRequestHandler)aHandler).HandleAsync(eventData, requestContext);
}
else
{
var requestParamType = aHandlerFactory.GetLocalEventType();
if (requestParamType != null)
{
var integrationEvent = JsonConvert.DeserializeObject(message, requestParamType);
var concreteType = typeof(IRequestHandler<>).MakeGenericType(requestParamType);
await (Task)concreteType.GetMethod("HandleAsync").Invoke(aHandler, new object[] { integrationEvent, requestContext });
}
}
aHandlerFactory.ReleaseHandler(aHandler);
}
catch (Exception ex)
{
LogMessage("error", "There has raised a error when send request.", ex);
}
}
return (T)requestContext.Response;
}
#endregion
private void LogMessage(string type, string value, Exception ex)
{
OnLogBusMessage?.Invoke(type, value, ex);
}
}
}