public int EnqueueRecurrentTask(Guid identifier, long interval)
{
if (interval < 1000)
{
throw new ArgumentException("interval");
}
var info = this.GetTaskInfo(identifier);
if (info == null)
{
throw new ArgumentException(String.Format("Task identifier [{0}] not registered.", identifier.ToString()));
}
LockInfo lockInfo = null;
try
{
if (LockManager.WaitForLock(ENQUEUE_RECURRENT_TASK_LOCK, new TimeSpan(TimeSpan.TicksPerMinute), new TimeSpan(TimeSpan.TicksPerSecond * 10), out lockInfo))
{
using (var tr = new TransactionScope(TransactionScopeOption.Suppress, TransactionScopeAsyncFlowOption.Enabled))
using (var context = CreateRepository())
{
//Adds or updates a recurrent task
var data = context.RecurrentTasks
.Where(t => t.Identifier == info.Identifier)
.OrderBy(t => t.Id).FirstOrDefault();
data = data ?? new RecurrentTaskDefinition()
{
Identifier = info.Identifier
};
data.Enabled = true;
data.Interval = interval;
if (data.Id == 0)
{
context.RecurrentTasks.Add(data);
}
context.SaveChanges();
var copies = context.RecurrentTasks
.Where(t => t.Identifier == info.Identifier)
.OrderBy(t => t.Id).ToList();
if (copies.Count == 0)
{
throw new ApplicationException("Database task entry was modified while enqueuing task.");
}
//Recurrent tasks cannot have duplicates
foreach (var duplicate in copies.Skip(1))
{
context.RecurrentTasks.Remove(duplicate);
}
var first = copies.FirstOrDefault();
if (first.Interval != interval)
{
first.Interval = interval;
}
context.SaveChanges();
return(first.Id);
}
}
else
{
throw new ApplicationException("Lock for resource ENQUEUE_RECURRENT_TASK_LOCK has been constantly denied.");
}
}
finally
{
LockManager.Release(lockInfo);
}
}
