public void WriteJobToQueue(FileSystemJobMetaData data)
{
bool written = false;
while (!written)
{
try
{
using (FileStream fs =
File.Open(FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
{
byte[] toRead = null;
using (var memStream = new MemoryStream())
{
fs.CopyTo(memStream);
toRead = memStream.ToArray();
}
List <FileSystemJobMetaData> serializedData = null;
if (toRead.Length > 0)
{
serializedData =
Newtonsoft.Json.JsonConvert.DeserializeObject <List <FileSystemJobMetaData> >(
Encoding.UTF8.GetString(toRead), new JsonSerializerSettings()
{
TypeNameHandling = TypeNameHandling.All
});
}
else
{
serializedData = new List <FileSystemJobMetaData>();
}
serializedData.Add(data);
var newData = Newtonsoft.Json.JsonConvert.SerializeObject(serializedData, new JsonSerializerSettings()
{
TypeNameHandling = TypeNameHandling.All
});
var toWrite = Encoding.UTF8.GetBytes(newData);
fs.Position = 0;
fs.SetLength(toWrite.Length);
fs.Write(toWrite, 0, toWrite.Length);
written = true;
}
}
catch (IOException ex)
{
//Magic Number Source:
//https://stackoverflow.com/questions/2568875/how-to-tell-if-a-caught-ioexception-is-caused-by-the-file-being-used-by-another
if (ex.HResult == unchecked ((int)0x80070020))
{
//Retry.
}
else
{
throw;
}
}
}
}
public Guid AddJob <TJob>(Expression <Action <TJob> > jobExpression, RetryParameters retryParameters = null, DateTimeOffset?executionTime = null, string queueName = "default")
{
var jobData = JobCreator.Create(jobExpression);
var toSer = new FileSystemJobMetaData()
{
JobId = Guid.NewGuid(),
JobArgs = jobData.JobArgs,
MethodName = jobData.MethodName,
RetryParameters = retryParameters ?? new RetryParameters(0, TimeSpan.FromSeconds(0), 0, null),
TypeExecutedOn = jobData.TypeExecutedOn,
QueueName = queueName,
CreatedOn = DateTime.Now,
Status = JobStates.New,
MethodGenericTypes = jobData.MethodGenericTypes
};
WriteJobToQueue(toSer);
return(toSer.JobId);
}
