private static AccountBalance GetAccountEntity(string account, CAP_CQRSEntities entities)
{
IQueryable<AccountBalance> query =
from b in entities.AccountBalances
where b.Account == account
select b;
AccountBalance entity = query.FirstOrDefault();
if (entity == null)
throw new ApplicationException("No such account.");
return entity;
}
private static AccountBalance GetAccountEntity(string account, CAP_CQRSEntities entities)
{
IQueryable <AccountBalance> query =
from b in entities.AccountBalances
where b.Account == account
select b;
AccountBalance entity = query.FirstOrDefault();
if (entity == null)
{
throw new ApplicationException("No such account.");
}
return(entity);
}
// TODO 2d: Command doesn't update current state.
public void Transfer(string fromAccount, string toAccount, decimal amount)
{
try
{
using (CAP_CQRSEntities entities = new CAP_CQRSEntities())
{
using (var tx = new TransactionScope())
{
AccountBalance from = GetAccountEntity(fromAccount, entities);
if (from.Balance < amount)
{
throw new ApplicationException("Insufficient funds.");
}
// INSERT
entities.AddToTransfers(new Transfer()
{
From = fromAccount,
To = toAccount,
Amount = amount
});
// PUBLISH
TransferMessage message = new TransferMessage()
{
FromAccount = fromAccount,
ToAccount = toAccount,
Amount = amount
};
using (var queue = new MessageQueue(IncreaseQueueName))
{
queue.Send(message, MessageQueueTransactionType.Automatic);
}
using (var queue = new MessageQueue(DecreaseQueueName))
{
queue.Send(message, MessageQueueTransactionType.Automatic);
}
entities.SaveChanges();
tx.Complete();
}
}
}
catch (Exception ex)
{
throw new FaultException(ex.Message);
}
}
// TODO 2c: Query is the same as before.
public decimal GetAccountBalance(string account)
{
try
{
using (CAP_CQRSEntities entities = new CAP_CQRSEntities())
{
AccountBalance entity = GetAccountEntity(account, entities);
return entity.Balance;
}
}
catch (Exception ex)
{
throw new FaultException(ex.Message);
}
}
// TODO 2c: Query is the same as before.
public decimal GetAccountBalance(string account)
{
try
{
using (CAP_CQRSEntities entities = new CAP_CQRSEntities())
{
AccountBalance entity = GetAccountEntity(account, entities);
return(entity.Balance);
}
}
catch (Exception ex)
{
throw new FaultException(ex.Message);
}
}
// TODO 2d: Command doesn't update current state.
public void Transfer(string fromAccount, string toAccount, decimal amount)
{
try
{
using (CAP_CQRSEntities entities = new CAP_CQRSEntities())
{
using (var tx = new TransactionScope())
{
AccountBalance from = GetAccountEntity(fromAccount, entities);
if (from.Balance < amount)
throw new ApplicationException("Insufficient funds.");
// INSERT
entities.AddToTransfers(new Transfer()
{
From = fromAccount,
To = toAccount,
Amount = amount
});
// PUBLISH
TransferMessage message = new TransferMessage()
{
FromAccount = fromAccount,
ToAccount = toAccount,
Amount = amount
};
using (var queue = new MessageQueue(IncreaseQueueName))
{
queue.Send(message, MessageQueueTransactionType.Automatic);
}
using (var queue = new MessageQueue(DecreaseQueueName))
{
queue.Send(message, MessageQueueTransactionType.Automatic);
}
entities.SaveChanges();
tx.Complete();
}
}
}
catch (Exception ex)
{
throw new FaultException(ex.Message);
}
}
