/// <summary>
/// Send message puts the message in the database to be processed
/// by the CDC.
/// </summary>
/// <param name="message">Message to publish</param>
void IMessageSender.Send(IMessage message)
{
// Relies on database column default value to set creation_time
var messageEntity = new Message(message);
using (EventuateTramDbContext dbContext = _dbContextProvider.CreateDbContext())
{
dbContext.Messages.Add(messageEntity);
dbContext.SaveChanges();
}
}
public bool IsDuplicate(string consumerId, string messageId)
{
string logContext = $"{nameof(IsDuplicate)} " +
$"for {nameof(consumerId)}='{consumerId}', {nameof(messageId)}='{messageId}'";
try
{
_logger.LogDebug($"+{logContext}");
using (EventuateTramDbContext dbContext = _dbContextProvider.CreateDbContext())
{
// Relies on database column default value to set creation_time
dbContext.ReceivedMessages.Add(new ReceivedMessage
{
ConsumerId = consumerId, MessageId = messageId
});
dbContext.SaveChanges();
}
_logger.LogDebug($"-{logContext}");
return(false);
}
catch (DbUpdateException e)
{
const int duplicateKeyError = 2627;
if (e.InnerException is SqlException sqlException && sqlException.Number == duplicateKeyError)
{
_logger.LogInformation($"{logContext}: Detected duplicate.");
return(true);
}
_logger.LogError(e, $"{logContext}: Got exception {e}");
throw;
}
}