77 lines
2.9 KiB
C#
77 lines
2.9 KiB
C#
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using Firebird2D.Interfaces;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net.Mail;
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using System.Text;
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using System.Threading.Tasks;
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namespace Firebird2D.EventPipelines
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{
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/// <summary>
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/// Eventpypeline which transports an event to every Subscyber
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/// </summary>
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/// <typeparam name="T">Event Arguments for the Pipeline event</typeparam>
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public class Pipeline <T> : IPipeline where T : EventArgs
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{
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/// <summary>
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/// Class witch owns the Pipeline and has the right to send events or delete the pipeline
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/// </summary>
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public object PipelineMaster { get; }
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//EventHandler to which the subscribers subribe.
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private event EventHandler<T>? OnEvent;
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/// <summary>
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/// Pipeline Constructor
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/// </summary>
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/// <param name="pipelineMaster">Every pipeline needs a Master which is able to send events or Destroy the pipeline</param>
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public Pipeline(object pipelineMaster)
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{
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PipelineMaster = pipelineMaster;
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}
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/// <summary>
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/// Check if no one subscribed to the event
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/// </summary>
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public bool IsEventEmpty { get { return OnEvent != null; } }
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/// <summary>
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/// Subscribe to this event Pipeline
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/// </summary>
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/// <param name="handler">Handler witch should be Invoked when the event is send</param>
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public void Subscribe(Delegate handler)
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{
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OnEvent += (EventHandler<T>)handler;
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}
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/// <summary>
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/// Unsubscribe from this event Pipeline
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/// </summary>
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/// <param name="handler">Handler witch should be removed from the Pipeline</param>
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public void Unsubscribe(Delegate handler)
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{
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OnEvent -= (EventHandler<T>)handler;
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}
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/// <summary>
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/// Method to send an event through the pipeline
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/// </summary>
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/// <param name="sender">Sneder object must be Pipelinemaster or the Pipeline throws an exception</param>
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/// <param name="args">Arguments that should be sent</param>
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/// <exception cref="ArgumentNullException">Exception when sender or arguments ar null</exception>
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/// <exception cref="ArgumentException">Exception wehn Arguments are not equal the Pipeline type</exception>
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/// <exception cref="InvalidDataException">Exception when sender is not Pipeline master</exception>
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public void SendEvent(object sender, T args)
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{
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if (sender == null || args == null) throw new ArgumentNullException(nameof(sender));
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if (args is not T) throw new ArgumentException($"Invalid EventArgs type. Expected {typeof(T)}");
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if (sender.Equals(PipelineMaster)) throw new InvalidDataException("Only the pipeline master is allowed to send events through this pipeline.");
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OnEvent?.Invoke(sender, args);
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}
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}
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}
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