| | | 1 | | using System; |
| | | 2 | | using System.Runtime.InteropServices.ComTypes; |
| | | 3 | | using System.Threading; |
| | | 4 | | |
| | | 5 | | namespace SolidEdgeCommunity; |
| | | 6 | | |
| | | 7 | | public abstract class EventSink<T> : IDisposable where T : class |
| | | 8 | | { |
| | | 9 | | private IConnectionPoint _connectionPoint; |
| | | 10 | | private int _cookie; |
| | | 11 | | |
| | 2 | 12 | | protected EventSink() |
| | | 13 | | { |
| | 2 | 14 | | } |
| | | 15 | | |
| | | 16 | | /// <summary> |
| | | 17 | | /// Establishes a connection between a connection point object and the client's sink. |
| | | 18 | | /// </summary> |
| | | 19 | | /// <param name="source">An event source that implements IConnectionPointContainer.</param> |
| | 0 | 20 | | protected EventSink(object source) => Connect(source); // If event source is specified, automatically connect. |
| | | 21 | | |
| | | 22 | | public void Dispose() |
| | | 23 | | { |
| | 1 | 24 | | Dispose(true); |
| | 1 | 25 | | GC.SuppressFinalize(this); |
| | 1 | 26 | | } |
| | | 27 | | |
| | | 28 | | protected virtual void Dispose(bool disposing) |
| | | 29 | | { |
| | 1 | 30 | | if (disposing) |
| | | 31 | | { |
| | | 32 | | // Clean up all managed resources |
| | | 33 | | } |
| | | 34 | | |
| | 1 | 35 | | Disconnect(); |
| | 1 | 36 | | } |
| | | 37 | | |
| | | 38 | | /// <summary> |
| | | 39 | | /// Establishes a connection between a connection point object and the client's sink. |
| | | 40 | | /// </summary> |
| | | 41 | | /// <param name="source">An event source that implements IConnectionPointContainer.</param> |
| | | 42 | | public void Connect(object source) |
| | | 43 | | { |
| | 2 | 44 | | bool lockTaken = false; |
| | 2 | 45 | | IConnectionPointContainer container = null; |
| | | 46 | | |
| | | 47 | | try |
| | | 48 | | { |
| | 2 | 49 | | Monitor.Enter(this, ref lockTaken); |
| | | 50 | | |
| | | 51 | | // If previous call was made, disconnect existing connection. |
| | 2 | 52 | | if (container != null) |
| | | 53 | | { |
| | 0 | 54 | | Disconnect(); |
| | | 55 | | } |
| | | 56 | | |
| | | 57 | | // QueryInterface for IConnectionPointContainer. |
| | 2 | 58 | | container = (IConnectionPointContainer)source; |
| | | 59 | | |
| | 2 | 60 | | var item = typeof(T).GUID; |
| | | 61 | | // Find the connection point by the GUID of type T. |
| | 2 | 62 | | container.FindConnectionPoint(ref item, out _connectionPoint); |
| | | 63 | | |
| | | 64 | | // Establish the sink connection. |
| | 2 | 65 | | _connectionPoint?.Advise(this, out _cookie); |
| | 2 | 66 | | } |
| | | 67 | | finally |
| | | 68 | | { |
| | 2 | 69 | | if (lockTaken) |
| | | 70 | | { |
| | 2 | 71 | | Monitor.Exit(this); |
| | | 72 | | } |
| | 2 | 73 | | } |
| | 2 | 74 | | } |
| | | 75 | | |
| | | 76 | | /// <summary> |
| | | 77 | | /// Terminates the advisory connection between a connection point and a client's sink. |
| | | 78 | | /// </summary> |
| | | 79 | | public void Disconnect() |
| | | 80 | | { |
| | 2 | 81 | | bool lockTaken = false; |
| | | 82 | | |
| | | 83 | | try |
| | | 84 | | { |
| | 2 | 85 | | Monitor.Enter(this, ref lockTaken); |
| | | 86 | | |
| | | 87 | | // Terminate the sink connection. |
| | 2 | 88 | | _connectionPoint?.Unadvise(_cookie); |
| | 2 | 89 | | } |
| | | 90 | | finally |
| | | 91 | | { |
| | 2 | 92 | | if (_connectionPoint != null) |
| | | 93 | | { |
| | | 94 | | try |
| | | 95 | | { |
| | 2 | 96 | | var count = System.Runtime.InteropServices.Marshal.ReleaseComObject(_connectionPoint); |
| | 0 | 97 | | } |
| | 2 | 98 | | catch |
| | | 99 | | { |
| | 2 | 100 | | } |
| | | 101 | | |
| | 2 | 102 | | _connectionPoint = null; |
| | 2 | 103 | | _cookie = 0; |
| | | 104 | | } |
| | | 105 | | |
| | 2 | 106 | | if (lockTaken) |
| | | 107 | | { |
| | 2 | 108 | | Monitor.Exit(this); |
| | | 109 | | } |
| | 2 | 110 | | } |
| | 2 | 111 | | } |
| | | 112 | | } |