* Change connection so it disposes its channel and session

projects/RabbitMQ.Client/client/impl/ChannelBase.cs

@@ -544,6 +544,7 @@ protected virtual void Dispose(bool disposing)
                         this.AbortAsync().GetAwaiter().GetResult();
                     }
                     ConsumerDispatcher.Dispose();
+                    Session.Dispose();
                     _rpcSemaphore.Dispose();
                     _confirmSemaphore?.Dispose();
                 }

projects/RabbitMQ.Client/client/impl/Connection.cs

@@ -50,7 +50,7 @@ internal sealed partial class Connection : IConnection
         private volatile bool _closed;
 
         private readonly ConnectionConfig _config;
-        private readonly ChannelBase _channel0; // FUTURE Note: this is not disposed
+        private readonly ChannelBase _channel0;
         private readonly MainSession _session0;
 
         private Guid _id = Guid.NewGuid();
@@ -513,7 +513,8 @@ private void Dispose(bool disposing)
                     {
                         this.AbortAsync().GetAwaiter().GetResult();
                     }
-                    _session0.Dispose();
+                    ((IDisposable)_channel0).Dispose();
+                    ((IDisposable)_session0).Dispose();
                     _mainLoopCts.Dispose();
                     _sessionManager.Dispose();
                 }

projects/RabbitMQ.Client/client/impl/ISession.cs

@@ -39,7 +39,7 @@ namespace RabbitMQ.Client.Impl
 {
     internal delegate Task CommandReceivedAction(IncomingCommand cmd, CancellationToken cancellationToken);
 
-    internal interface ISession
+    internal interface ISession : IDisposable
     {
         /// <summary>
         /// Gets the channel number.

projects/RabbitMQ.Client/client/impl/MainSession.cs

@@ -43,7 +43,7 @@
 namespace RabbitMQ.Client.Impl
 {
     ///<summary>Small ISession implementation used only for channel 0.</summary>
-    internal sealed class MainSession : Session, IDisposable
+    internal sealed class MainSession : Session
     {
         private volatile bool _closeIsServerInitiated;
         private volatile bool _closing;
@@ -121,6 +121,17 @@ public override ValueTask TransmitAsync<T>(in T cmd, CancellationToken cancellat
             return base.TransmitAsync(in cmd, cancellationToken);
         }
 
-        public void Dispose() => ((IDisposable)_closingSemaphore).Dispose();
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                if (false == _disposedValue)
+                {
+                    ((IDisposable)_closingSemaphore).Dispose();
+                }
+            }
+
+            base.Dispose(disposing);
+        }
     }
 }

projects/RabbitMQ.Client/client/impl/SessionBase.cs

@@ -44,6 +44,7 @@ namespace RabbitMQ.Client.Impl
 {
     internal abstract class SessionBase : ISession
     {
+        protected bool _disposedValue;
         private ShutdownEventArgs _closeReason;
         public ShutdownEventArgs CloseReason => Volatile.Read(ref _closeReason);
 
@@ -169,5 +170,20 @@ public Task NotifyAsync(CancellationToken cancellationToken)
 
         private void ThrowAlreadyClosedException()
             => throw new AlreadyClosedException(CloseReason);
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _disposedValue = true;
+            }
+        }
+
+        public void Dispose()
+        {
+            // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
     }
 }

projects/RabbitMQ.Client/client/impl/SessionManager.cs

@@ -122,6 +122,6 @@ public ISession Lookup(int number)
             }
         }
 
-        public void Dispose() => _sessionMapSemaphore.Dispose();
+        public void Dispose() => ((IDisposable)_sessionMapSemaphore).Dispose();
     }
 }