/// <summary>
/// The repository is a folder, and these are in time-order, so the smallest is oldest,
/// which is the one we want (FIFO). This will grabe this and deserialize it.
/// </summary>
/// <param name="queueLocation"></param>
/// <param name="explanation"></param>
/// <returns></returns>
public static bool PutRequest(string queueLocation, SimEngineRequest request, out string explanation)
{
explanation = "";
try
{
if (!Directory.Exists(queueLocation))
{
explanation = $"Path={queueLocation} does not exist.";
return(false);
}
if (request == null)
{
explanation = $"request cannot be null.";
return(false);
}
string path = BuildRequestPath(queueLocation, request);
if (!JsonHelpers.SerializeToFile <SimEngineRequest>(path, request, false, out explanation))
{
return(false);
}
return(true);
}
catch (Exception ex)
{
explanation = $"Location={queueLocation}. Err={ex.Message}";
return(false);
}
}
/// <summary>
/// Build a legitimate file path using the current time (DateTimeOffset)
/// and the Project name, with a .json extension.
/// This guarantess that the default ordering from GetFiles will have
/// the oldest files first.
/// Example: 2020-11-29 13-58-34-3922-DiscretPartsProduction.json
/// </summary>
/// <param name="queueLocation"></param>
/// <param name="request"></param>
/// <returns></returns>
public static string BuildRequestPath(string queueLocation, SimEngineRequest request)
{
string timestamp = DateTimeOffset.Now.ToString("yyyy-MM-dd HH:mm.ss.ffff")
.Replace(":", "-")
.Replace(".", "-");
string projectName = Path.GetFileNameWithoutExtension(request.ProjectFilename);
string fullpath = Path.Combine(queueLocation, $"{timestamp}-{projectName}.json");
return(fullpath);
}
/// <summary>
/// The request repository is a folder, and the files within are in time-order, so the smallest is oldest,
/// which is the one we want (FIFO). This will grabe this and deserialize it.
/// </summary>
/// <param name="queueLocation"></param>
/// <param name="explanation"></param>
/// <returns></returns>
public static SimEngineRequest GetNextRequest(string queueLocation, out string explanation)
{
explanation = "";
string marker = "Begin.";
SimEngineRequest request = null;
try
{
marker = $"Getting files from {queueLocation}";
List <string> fileList = Directory.GetFiles(queueLocation, "*.json").ToList();
if (!fileList.Any())
{
return(null);
}
string path = fileList.First();
// try 5 times... to handle the rare conflicts between producer and consumer.
int attempts = 0;
while (attempts < 5)
{
marker = $"Deserializing from={path}. Attempts={attempts}";
if (!JsonHelpers.DeserializeFromFile <SimEngineRequest>(path, out request, out explanation))
{
if (++attempts >= 5)
{
return(null);
}
System.Threading.Thread.Sleep(100);
}
else
{
request.RequestPath = path;
marker = $"Set RequestPath to={request.RequestPath}";
goto DoneWithAttempts;
}
} // while not successful
DoneWithAttempts:
return(request);
}
catch (Exception ex)
{
explanation = $"Location={queueLocation}. Marker={marker}. Err={ex.Message}";
return(null);
}
}