private static void InitDB()
{
using (ECommerce2Context db = new ECommerce2Context()) {
IEnumerable <string> pendings = db.Database.GetPendingMigrations();
if (pendings != null)
{
db.Database.Migrate();
Console.WriteLine("DB Migrated");
}
else
{
Console.WriteLine("DB Migration Not Needed");
}
}
}
public OrderResponseManager()
{
redis = new RedisCacheManager();
factory = new ConnectionFactory()
{
HostName = Common.Constants.InternalHost
};
var connection = factory.CreateConnection();
var channel = connection.CreateModel();
channel.ExchangeDeclare(exchange: Common.Constants.RabbitMQExchange, type: "direct");
channel.QueueDeclare(queue: Common.Constants.RabbitMQOrderQueueName,
durable: false,
exclusive: false,
autoDelete: false,
arguments: null);
channel.QueueBind(queue: Common.Constants.RabbitMQOrderQueueName,
exchange: Common.Constants.RabbitMQExchange,
routingKey: Common.Constants.RabbitMQOrderRoutingKey);
var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
byte[] body = ea.Body.ToArray();
string orderRequestStr = Encoding.UTF8.GetString(body);
OrderRequestModel orderRequest = JsonConvert.DeserializeObject <OrderRequestModel>(orderRequestStr);
while (!redis.SetKey(orderRequest.ProductId, "lock", TimeSpan.FromSeconds(3)))
{
Console.WriteLine("Waiting For Access To => {0}", orderRequest.ProductId);
Thread.Sleep(100);
}
using (ECommerce2Context db = new ECommerce2Context())
{
Product p = db.Products.FirstOrDefault(x => x.ProductId == orderRequest.ProductId);
if (p != null)
{
OrderResponseModel orderResponse = new OrderResponseModel()
{
IsError = true,
Quantity = orderRequest.Quantity,
ProductId = orderRequest.ProductId,
ProductName = p.ProductName
};
if ((p.Quantity - orderRequest.Quantity) > 0)
{
Console.WriteLine("{0} x '{1}' Product Sold For (Customer Id = '{2}')", orderRequest.Quantity, p.ProductName, orderRequest.RequestCustomerId);
p.Quantity -= orderRequest.Quantity;
db.SaveChanges();
orderResponse.IsError = false;
}
else
{
Console.WriteLine("{0} x '{1}' Product Could't Sold (Customer Id = '{2}') - SQ: {3}", orderRequest.Quantity, p.ProductName, orderRequest.RequestCustomerId, p.Quantity);
}
string orderResponseStr = JsonConvert.SerializeObject(orderResponse);
byte[] requestBody = Encoding.UTF8.GetBytes(orderResponseStr);
try
{
channel.BasicPublish(exchange: Common.Constants.RabbitMQExchange, routingKey: Common.Constants.RabbitMQCustomerPrefix + orderRequest.RequestCustomerId, basicProperties: null, body: requestBody);
}
catch (Exception)
{
Console.WriteLine("Customer Gone Away => {0}", orderRequest.RequestCustomerId);
}
}
else
{
Console.WriteLine("Product Cannot Found => {0} ", orderRequest.ProductId);
}
}
redis.RemoveLockKey(orderRequest.ProductId);//RELASE LOCK
};
channel.BasicConsume(queue: Common.Constants.RabbitMQOrderQueueName,
autoAck: true,
consumer: consumer);
}
