Dispose channel pool on application shutdown.

framework/src/Volo.Abp.BackgroundJobs.RabbitMQ/Volo/Abp/BackgroundJobs/RabbitMQ/AbpBackgroundJobsRabbitMqModule.cs

@@ -25,5 +25,12 @@ namespace Volo.Abp.BackgroundJobs.RabbitMQ
                 .GetRequiredService<IJobQueueManager>()
                 .Start();
         }
+
+        public override void OnApplicationShutdown(ApplicationShutdownContext context)
+        {
+            context.ServiceProvider
+                .GetRequiredService<IJobQueueManager>()
+                .Stop();
+        }
     }
 }

framework/src/Volo.Abp.Core/Volo/Abp/Modularity/ModuleManager.cs

@@ -57,9 +57,11 @@ namespace Volo.Abp.Modularity
 
         public void ShutdownModules(ApplicationShutdownContext context)
         {
+            var modules = _moduleContainer.Modules.Reverse().ToList();
+
             foreach (var contributer in _lifecycleContributers)
             {
-                foreach (var module in _moduleContainer.Modules)
+                foreach (var module in modules)
                 {
                     contributer.Shutdown(context, module.Instance);
                 }

framework/src/Volo.Abp.RabbitMQ/Volo/Abp/RabbitMQ/AbpRabbitMqModule.cs

@@ -17,10 +17,12 @@ namespace Volo.Abp.RabbitMQ
         public override void OnApplicationShutdown(ApplicationShutdownContext context)
         {
             context.ServiceProvider
-                .GetRequiredService<IConnectionPool>()
+                .GetRequiredService<IChannelPool>()
                 .Dispose();
 
-            //TODO: Dispose channel pool when it's implemented! 
+            context.ServiceProvider
+                .GetRequiredService<IConnectionPool>()
+                .Dispose();
         }
     }
 }

framework/src/Volo.Abp.RabbitMQ/Volo/Abp/RabbitMQ/ChannelPool.cs

@@ -11,7 +11,11 @@ namespace Volo.Abp.RabbitMQ
         protected IConnectionPool ConnectionPool { get; }
 
         protected ConcurrentDictionary<string, ChannelPoolItem> Channels { get; }
+
+        protected bool IsDisposed { get; private set; }
         
+        protected TimeSpan ChannelDisposeWaitDuration { get; set; } = TimeSpan.FromSeconds(15);
+
         public ChannelPool(IConnectionPool connectionPool)
         {
             ConnectionPool = connectionPool;
@@ -20,40 +24,115 @@ namespace Volo.Abp.RabbitMQ
 
         public virtual IChannelAccessor Acquire(string channelName = null)
         {
+            CheckDisposed();
+
             channelName = channelName ?? "";
 
-            var poolItem = Channels.GetOrAdd(channelName, _ => new ChannelPoolItem
+            var poolItem = Channels.GetOrAdd(
+                channelName,
+                _ => new ChannelPoolItem(CreateChannel(channelName))
+            );
+
+            poolItem.Acquire();
+
+            return new ChannelAccessor(
+                poolItem.Channel,
+                () => poolItem.Release()
+            );
+        }
+
+        protected virtual IModel CreateChannel(string channelName)
+        {
+            //TODO: How to determine the right connection name?
+            return ConnectionPool.Get().CreateModel();
+        }
+
+        protected void CheckDisposed()
+        {
+            if (IsDisposed)
+            {
+                throw new ObjectDisposedException(nameof(ChannelPool));
+            }
+        }
+
+        public void Dispose()
+        {
+            if (IsDisposed)
             {
-                Channel = CreateChannel(channelName)
-            });
+                return;
+            }
 
-            lock (poolItem)
+            IsDisposed = true;
+
+            foreach (var poolItem in Channels.Values)
             {
-                while (poolItem.IsInUse)
+                try
                 {
-                    Monitor.Wait(poolItem);
+                    poolItem.WaitIfInUse(ChannelDisposeWaitDuration);
+                    poolItem.Channel.Dispose();
                 }
-                
-                poolItem.IsInUse = true;
+                catch
+                { }
             }
 
-            return new ChannelAccessor(
-                poolItem.Channel,
-                () =>
+            Channels.Clear();
+        }
+
+        protected class ChannelPoolItem : IDisposable
+        {
+            public IModel Channel { get; }
+
+            public bool IsInUse
+            {
+                get => _isInUse;
+                private set => _isInUse = value;
+            }
+            private volatile bool _isInUse;
+
+            public ChannelPoolItem(IModel channel)
+            {
+                Channel = channel;
+            }
+
+            public void Acquire()
+            {
+                lock (this)
                 {
-                    lock (poolItem)
+                    while (IsInUse)
                     {
-                        poolItem.IsInUse = false;
-                        Monitor.PulseAll(poolItem);
+                        Monitor.Wait(this);
                     }
+
+                    IsInUse = true;
                 }
-            );
-        }
+            }
 
-        protected virtual IModel CreateChannel(string channelName)
-        {
-            //TODO: How to determine the right connection name?
-            return ConnectionPool.Get().CreateModel();
+            public void WaitIfInUse(TimeSpan timeout)
+            {
+                lock (this)
+                {
+                    if (!IsInUse)
+                    {
+                        return;
+                    }
+
+                    Monitor.Wait(this, timeout);
+                }
+            }
+
+            public void Release()
+            {
+                lock (this)
+                {
+                    IsInUse = false;
+                    Monitor.PulseAll(this);
+                }
+            }
+
+            public void Dispose()
+            {
+                Channel.Dispose();
+            }
         }
 
         protected class ChannelAccessor : IChannelAccessor

framework/src/Volo.Abp.RabbitMQ/Volo/Abp/RabbitMQ/ChannelPoolItem.cs

@@ -1,16 +0,0 @@
-using RabbitMQ.Client;
-
-namespace Volo.Abp.RabbitMQ
-{
-    public class ChannelPoolItem
-    {
-        public IModel Channel { get; set; }
-
-        public bool IsInUse
-        {
-            get => _isInUse;
-            set => _isInUse = value;
-        }
-        private volatile bool _isInUse;
-    }
-}

framework/src/Volo.Abp.RabbitMQ/Volo/Abp/RabbitMQ/ConnectionPool.cs

@@ -53,6 +53,8 @@ namespace Volo.Abp.RabbitMQ
 
                 }
             }
+
+            Connections.Clear();
         }
     }
 }

framework/src/Volo.Abp.RabbitMQ/Volo/Abp/RabbitMQ/IChannelPool.cs

@@ -1,6 +1,8 @@
-namespace Volo.Abp.RabbitMQ
+using System;
+
+namespace Volo.Abp.RabbitMQ
 {
-    public interface IChannelPool
+    public interface IChannelPool : IDisposable
     {
         IChannelAccessor Acquire(string channelName = null);
     }