Use lazy in connection pooling

framework/src/Volo.Abp.Kafka/Volo/Abp/Kafka/ConsumerPool.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Concurrent;
-using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using Confluent.Kafka;
@@ -15,7 +14,7 @@ namespace Volo.Abp.Kafka
     {
         protected AbpKafkaOptions Options { get; }
 
-        protected ConcurrentDictionary<string, IConsumer<string, byte[]>> Consumers { get; }
+        protected ConcurrentDictionary<string, Lazy<IConsumer<string, byte[]>>> Consumers { get; }
 
         protected TimeSpan TotalDisposeWaitDuration { get; set; } = TimeSpan.FromSeconds(10);
 
@@ -27,7 +26,7 @@ namespace Volo.Abp.Kafka
         {
             Options = options.Value;
 
-            Consumers = new ConcurrentDictionary<string, IConsumer<string, byte[]>>();
+            Consumers = new ConcurrentDictionary<string, Lazy<IConsumer<string, byte[]>>>();
             Logger = new NullLogger<ConsumerPool>();
         }
 
@@ -36,7 +35,7 @@ namespace Volo.Abp.Kafka
             connectionName ??= KafkaConnections.DefaultConnectionName;
 
             return Consumers.GetOrAdd(
-                connectionName, connection =>
+                connectionName, connection => new Lazy<IConsumer<string, byte[]>>(() =>
                 {
                     var config = new ConsumerConfig(Options.Connections.GetOrDefault(connection))
                     {
@@ -45,10 +44,9 @@ namespace Volo.Abp.Kafka
                     };
 
                     Options.ConfigureConsumer?.Invoke(config);
-
                     return new ConsumerBuilder<string, byte[]>(config).Build();
-                }
-            );
+                })
+            ).Value;
         }
 
         public void Dispose()
@@ -78,8 +76,8 @@ namespace Volo.Abp.Kafka
 
                 try
                 {
-                    consumer.Close();
-                    consumer.Dispose();
+                    consumer.Value.Close();
+                    consumer.Value.Dispose();
                 }
                 catch
                 {

framework/src/Volo.Abp.Kafka/Volo/Abp/Kafka/ProducerPool.cs

@@ -14,7 +14,7 @@ namespace Volo.Abp.Kafka
     {
         protected AbpKafkaOptions Options { get; }
 
-        protected ConcurrentDictionary<string, IProducer<string, byte[]>> Producers { get; }
+        protected ConcurrentDictionary<string, Lazy<IProducer<string, byte[]>>> Producers { get; }
 
         protected TimeSpan TotalDisposeWaitDuration { get; set; } = TimeSpan.FromSeconds(10);
 
@@ -26,7 +26,7 @@ namespace Volo.Abp.Kafka
         {
             Options = options.Value;
 
-            Producers = new ConcurrentDictionary<string, IProducer<string, byte[]>>();
+            Producers = new ConcurrentDictionary<string, Lazy<IProducer<string, byte[]>>>();
             Logger = new NullLogger<ProducerPool>();
         }
 
@@ -35,14 +35,14 @@ namespace Volo.Abp.Kafka
             connectionName ??= KafkaConnections.DefaultConnectionName;
 
             return Producers.GetOrAdd(
-                connectionName, connection =>
+                connectionName, connection => new Lazy<IProducer<string, byte[]>>(() =>
                 {
                     var config = Options.Connections.GetOrDefault(connection);
 
                     Options.ConfigureProducer?.Invoke(new ProducerConfig(config));
 
                     return new ProducerBuilder<string, byte[]>(config).Build();
-                });
+                })).Value;
         }
 
         public void Dispose()
@@ -72,7 +72,7 @@ namespace Volo.Abp.Kafka
 
                 try
                 {
-                    producer.Dispose();
+                    producer.Value.Dispose();
                 }
                 catch
                 {

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

@@ -1,4 +1,5 @@
-using System.Collections.Concurrent;
+using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using Microsoft.Extensions.Options;
 using RabbitMQ.Client;
@@ -10,14 +11,14 @@ namespace Volo.Abp.RabbitMQ
     {
         protected AbpRabbitMqOptions Options { get; }
 
-        protected ConcurrentDictionary<string, IConnection> Connections { get; }
+        protected ConcurrentDictionary<string, Lazy<IConnection>> Connections { get; }
 
         private bool _isDisposed;
 
         public ConnectionPool(IOptions<AbpRabbitMqOptions> options)
         {
             Options = options.Value;
-            Connections = new ConcurrentDictionary<string, IConnection>();
+            Connections = new ConcurrentDictionary<string, Lazy<IConnection>>();
         }
 
         public virtual IConnection Get(string connectionName = null)
@@ -25,15 +26,15 @@ namespace Volo.Abp.RabbitMQ
             connectionName ??= RabbitMqConnections.DefaultConnectionName;
 
             return Connections.GetOrAdd(
-                connectionName,
-                () =>
+                connectionName, () => new Lazy<IConnection>(() =>
                 {
                     var connection = Options.Connections.GetOrDefault(connectionName);
                     var hostnames = connection.HostName.TrimEnd(';').Split(';');
                     // Handle Rabbit MQ Cluster.
                     return hostnames.Length == 1 ? connection.CreateConnection() : connection.CreateConnection(hostnames);
-                }
-            );
+
+                })
+            ).Value;
         }
 
         public void Dispose()
@@ -49,7 +50,7 @@ namespace Volo.Abp.RabbitMQ
             {
                 try
                 {
-                    connection.Dispose();
+                    connection.Value.Dispose();
                 }
                 catch
                 {