public JsonResult StartJob(string filename)//or maybe you've already uploaded and have a fileId instead
{
var jobState = new ResumableJobState
{
CurrentIteration = 0,
InputFile = filename,
OutputFile = filename + "_output.csv"
};
var job = new LongRunningJob
{
State = "Running",
ResumableJobState = jobState
};
_context.ResumableJobStates.Add(jobState);
_context.LongRunningJobs.Add(job);
var result = _context.SaveChanges();
if (result == 0) throw new Exception("Error saving to database");
_jobinatorService.StartOrResume(job);
return Json(job);
}
public void StartOrResume(LongRunningJob job)
{
Task.Run(() =>
{
using (var inputFile = System.IO.File.OpenRead(_filePath + job.ResumableJobState.InputFile))
using (var outputFile = System.IO.File.OpenWrite(_filePath + job.ResumableJobState.OutputFile))
{
inputFile.Position = job.ResumableJobState.CurrentIteration;
for (int i = (int)inputFile.Position; i < inputFile.Length; i++)//casting long to int, what could possibly go wrong?
{
if (job.State == "Input Required" && job.ResumableJobState.RequiredInputType != null)
{//We needed input and received it
//You might want to do a switch..case on the various inputs, and branch into different functions
if (job.ResumableJobState.RequiredInputType.InputName == "6*7")
if (job.ResumableJobState.RequiredInputType.IntValue.Value == 42)
break;//Pass Go, collect 42 dollars;
}
outputFile.WriteByte((byte)inputFile.ReadByte());//Don't try this at home!
job.ResumableJobState.CurrentIteration = i;//or row, or line, or however you delimit processing
job.ResumableJobState.InputFileBufferReadPosition = inputFile.Position;//or something
if (i % 7 == 0)
job.ResumableJobState.RequiredInputType = _context.RequiredInputTypes.First(t => t.InputName == "Row 7 Input");
if (i % 42 == 0)
job.ResumableJobState.RequiredInputType = _context.RequiredInputTypes.First(t => t.InputName == "6*7");
if (job.ResumableJobState.RequiredInputType != null)
job.State = "Input Required";
_context.SaveChanges();
if (job.State != "Running")
return;
}
job.State = "Completed";
_context.SaveChanges();
}
});
return;
}
