完善 eventbus 多个实例之间重试时的数据隔离

src/Pole.EventStorage.PostgreSql/PostgreSqlEventStorage.cs

@@ -83,22 +83,27 @@ $"UPDATE {tableName} SET \"Retries\"=@Retries,\"ExpiresAt\"=@ExpiresAt,\"StatusN
                 $"SELECT * FROM {tableName} WHERE \"Retries\"<{producerOptions.MaxFailedRetryCount} AND \"Added\"<'{fourMinAgo}' AND  \"StatusName\"='{EventStatus.Pending}' for update skip locked LIMIT 200;";
 
             var result = new List<EventEntity>();
-            using var connection = new NpgsqlConnection(options.ConnectionString);
-            var reader = await connection.ExecuteReaderAsync(sql);
-            while (reader.Read())
+            using (var connection = new NpgsqlConnection(options.ConnectionString))
             {
-                result.Add(new EventEntity
+                using (var transaction = await connection.BeginTransactionAsync())
                 {
-                    Id = reader.GetString(0),
-                    Name = reader.GetString(2),
-                    Content = reader.GetString(3),
-                    Retries = reader.GetInt32(4),
-                    Added = reader.GetDateTime(5),
-                    StatusName = reader.GetString(7)
-                });
+                    var reader = await connection.ExecuteReaderAsync(sql);
+                    while (reader.Read())
+                    {
+                        result.Add(new EventEntity
+                        {
+                            Id = reader.GetString(0),
+                            Name = reader.GetString(2),
+                            Content = reader.GetString(3),
+                            Retries = reader.GetInt32(4),
+                            Added = reader.GetDateTime(5),
+                            StatusName = reader.GetString(7)
+                        });
+                    }
+                    await transaction.CommitAsync();
+                    return result;
+                }
             }
-
-            return result;
         }
 
         public async Task<bool> StoreMessage(EventEntity eventEntity, object dbTransaction = null)