protected void InvokePerform(IJobPublisher publisher, IMessageReceiver receiver, JobInfo jobInfo, ulong deliveryTag, IJobServiceScope serviceScope, CancellationToken cancellationToken)
{
IBrokerTransaction tx = null;
try
{
var reflectionInfo = ReflectionUtilities.ReflectionCache.GetJobReflectionInfo(jobInfo.JobType, jobInfo.ArgsType);
object job;
switch (reflectionInfo.CtorType)
{
case ReflectionUtilities.ConstructorType.NoArgs:
job = reflectionInfo.Ctor.Invoke(null);
break;
case ReflectionUtilities.ConstructorType.NeedsPublisher:
job = reflectionInfo.Ctor.Invoke(new object[] { publisher });
break;
default:
var parametersInfo = reflectionInfo.Ctor.GetParameters();
var parameters = new object[parametersInfo.Length];
for (var i = 0; i < parametersInfo.Length; i++)
{
if (parametersInfo[i].IsOut)
{
throw new Exception("Out parameters are not supported.");
}
parameters[i] = serviceScope.GetRequiredService(parametersInfo[i].ParameterType);
}
job = reflectionInfo.Ctor.Invoke(parameters);
break;
}
if (job == null)
{
throw new Exception($"Job type {jobInfo.JobType} is not registered in service scope and appropriate constructor does not exist!");
}
if ((bool)reflectionInfo.UseTransactionGetter(job))
{
tx = receiver.BeginTransaction(serviceScope);
}
object result;
switch (reflectionInfo.PerfMethodType)
{
case ReflectionUtilities.PerformMethodType.NoArgs:
result = reflectionInfo.PerformDelegate1(job);
break;
case ReflectionUtilities.PerformMethodType.NeedsArgs:
result = reflectionInfo.PerformDelegate2(job, jobInfo.Args);
break;
case ReflectionUtilities.PerformMethodType.NeedsCancellationToken:
result = reflectionInfo.PerformDelegate3(job, cancellationToken);
break;
case ReflectionUtilities.PerformMethodType.NeedsArgsAndCancellationToken:
result = reflectionInfo.PerformDelegate4(job, jobInfo.Args, cancellationToken);
break;
default:
throw new ArgumentOutOfRangeException(nameof(reflectionInfo.PerfMethodType));
}
if (result != null && result is Task taskResult)
{
taskResult.Wait(cancellationToken);
}
receiver.AckBatchMessageProcessed(serviceScope, deliveryTag);
tx?.Commit();
}
catch (TargetInvocationException ex)
{
try
{
tx?.Rollback();
}
catch (Exception rollbackEx)
{
_logger.LogError(rollbackEx, "Rollback failed");
}
if (ex.InnerException == null)
{
throw;
}
ExceptionDispatchInfo.Capture(ex.InnerException).Throw();
}
finally
{
tx.SafeDispose(_logger);
}
}