/// <summary>
/// Do some work. This is where the meat of the processing is done
/// </summary>
public async Task <JobResultModel> DoWorkAsync(string jobId, JobParametersModel work,
CancellationToken cancellationToken)
{
// here's an HttpClient if you need one
var httpClient = _httpClientFactory.CreateClient();
var next = work.SeedData;
var result = new JobResultModel();
var sw = new Stopwatch();
sw.Start();
for (ulong i = 0; i < work.Iterations; ++i)
{
next = unchecked (next * 1103515245 + 12345);
result.CalculatedResult = next / 65536 % 32768;
await Task.Delay(1000,
cancellationToken).ConfigureAwait(false); // simulate long-running task.
// make sure we only update status once a second
if (sw.ElapsedMilliseconds >= 1000)
{
sw.Restart();
await _computationJobStatus.UpdateJobProgressInformationAsync(
jobId, $"Current result: {result.CalculatedResult}",
i / (double)work.Iterations).ConfigureAwait(false);
}
}
await _computationJobStatus.UpdateJobProgressInformationAsync(
jobId, $"Done", 1.0).ConfigureAwait(false);
return(result);
}
/// <summary>
/// Transient method via IQueuedBackgroundService
/// </summary>
public async Task <JobCreatedModel> PostWorkItemAsync(JobParametersModel jobParameters)
{
var jobId = await _jobStatusService.CreateJobAsync(jobParameters).ConfigureAwait(false);
_queue.Enqueue(new JobQueueItem {
JobId = jobId, JobParameters = jobParameters
});
_signal.Release(); // signal for background service to start working on the job
return(new JobCreatedModel {
JobId = jobId, QueuePosition = _queue.Count
});
}
public async Task <string> CreateJobAsync(JobParametersModel jobParameters)
{
// find a jobId that isn't in use (this may be pointless, but could you imagine?)
string jobId;
do
{
jobId = Guid.NewGuid().ToString();
} while (await _jobStorage.ExistsAsync(DatabaseKey, jobId).ConfigureAwait(false));
await WriteAsync(new JobModel
{
JobId = jobId,
StartTime = DateTime.UtcNow,
Status = JobStatus.Pending,
WorkParameters = jobParameters
}).ConfigureAwait(false);
return(jobId);
}
public async Task <IActionResult> BeginComputation([FromBody] JobParametersModel obj)
{
return(Accepted(
await _queuedBackgroundService.PostWorkItemAsync(obj).ConfigureAwait(false)));
}
