public void Execute(IAquilesCommand command)
{
if (command != null)
{
this.ExecuteCommand(command);
}
else
{
throw new ArgumentNullException("command");
}
}
private void ExecuteCommand(IAquilesCommand command)
{
long startedTicks = DateTime.Now.Ticks;
command.ValidateInput(cluster.KeySpaces);
bool isClientStillHealthy = false;
bool openedInScope = false;
bool shouldRetry = false;
do
{
openedInScope = this.OpenCassandraClientConnection(openedInScope);
try
{
this.logger.Debug("executing command.");
command.Execute(this.cassandraClient.InnerClient);
isClientStillHealthy = true;
shouldRetry = false;
}
catch (NotFoundException ex)
{
//WTF?? "not found" should be trapped.
string error = BuildExceptionMessage(ex);
logger.Error(error, ex);
// despite this command failed, the connection is still usable.
isClientStillHealthy = true;
throw new AquilesException(error, ex);
}
catch (InvalidRequestException ex)
{
//WTF?? "invalid request" should checked on the command method "ValidateRequest"
string error = BuildExceptionMessage(ex, ex.Why);
logger.Error(error, ex);
// despite this command failed, the connection is still usable.
isClientStillHealthy = true;
throw new AquilesException(error, ex);
}
catch (UnavailableException ex)
{
//WTF?? Cassandra cannot ensure object replication state?
string error = BuildExceptionMessage(ex);
logger.Error(error, ex);
throw new AquilesException(error, ex);
}
catch (TimedOutException ex)
{
//WTF?? Cassandra timeout?
string error = BuildExceptionMessage(ex);
logger.Error(error, ex);
throw new AquilesException(error, ex);
}
catch (TApplicationException ex)
{
// client thrift version does not match server version?
string error = BuildExceptionMessage(ex);
logger.Error(error, ex);
throw new AquilesException(error, ex);
}
catch (AuthenticationException ex)
{
// invalid credentials
string error = BuildExceptionMessage(ex, ex.Why);
logger.Error(error, ex);
// despite this command failed, the connection is still usable.
isClientStillHealthy = true;
throw new AquilesException(error, ex);
}
catch (AuthorizationException ex)
{
// user does not have access to keyspace
string error = BuildExceptionMessage(ex, ex.Why);
logger.Error(error, ex);
// despite this command failed, the connection is still usable.
isClientStillHealthy = true;
throw new AquilesException(error, ex);
}
catch (IOException ex)
{
// i got the client, it was opened but the node crashed or something
if (openedInScope)
{
logger.Warn(logger.StringFormatInvariantCulture("Exception '{0}', retrying on a different connection.", ex), ex);
shouldRetry = true;
}
else
{
string error = BuildExceptionMessage(ex);
logger.Error(error, ex);
// despite this command failed, the connection is still usable.
throw new AquilesException(error, ex);
}
}
finally
{
this.isClientHealthy = isClientStillHealthy;
if (openedInScope)
{
this.logger.Debug("connection opened in scope, closing.");
this.Close();
}
}
} while (shouldRetry);
TimeSpan duration = new TimeSpan(DateTime.Now.Ticks - startedTicks);
logger.Info(logger.StringFormatInvariantCulture("Command '{0}' took {1} ms.", command, duration.Milliseconds));
}
