/// <summary>
/// Signals to start a new execution at the next available slot.
/// </summary>
protected void QueueExecution()
{
lock (_syncExecution)
{
if (!this.IsLoaded || this.IsStopped)
{
throw new InvalidOperationException("Cannot execute. Service app is not loaded or has stopped.");
}
bool createContext = false;
switch (this.ExecutionMode)
{
case ExecutionMode.Default:
case ExecutionMode.Idempotent:
if (!this._executionContexts.Any() || this._executionContexts.All(c => c.Failed))
{
createContext = true;
}
break;
case ExecutionMode.Inline:
createContext = true;
break;
case ExecutionMode.Concurrent:
if (Settings.MaxConcurrentExecutions == 0 || this._executionContexts.Count(c => c.IsExecuting) <= Settings.MaxConcurrentExecutions)
{
createContext = true;
}
break;
default:
throw new NotImplementedException("Execution mode not yet implemented");
}
if (createContext)
{
var context = new ServiceAppContext()
{
Failed = false,
QueuedTime = DateTimeResolver.Resolve(),
Guid = Guid.NewGuid().ToString(),
Name = this.DisplayName
};
this._executionContexts.Add(context);
}
}
}
/// <summary>
/// Handles the 'tick' event of the executionTimer.
/// </summary>
/// <param name="state">The state.</param>
private void ExecutionTimer_Tick(object state)
{
if (this.IsStopped)
{
_executionTimer.Change(Timeout.Infinite, Timeout.Infinite);
return;
}
ServiceAppContext currentContext = null;
switch (this.ExecutionMode)
{
case Execution.ExecutionMode.Default:
case Execution.ExecutionMode.Idempotent:
case Execution.ExecutionMode.Concurrent:
currentContext = this._executionContexts.FirstOrDefault(c => c.CanExecute);
break;
case Execution.ExecutionMode.Inline:
currentContext = this._executionContexts.FirstOrDefault(c => c.CanExecute && !this.IsExecuting);
break;
default:
throw new NotImplementedException("Execution mode not yet implemented");
}
if (currentContext != null)
{
Task executionTask = Task.Run(() =>
{
Messages.WriteState(Enums.State.Executing);
Messages.WriteDebug("Starting exection for {0}. Time: {1}", this.DisplayName, currentContext.StartTime);
currentContext.StartTime = DateTimeResolver.Resolve();
Messages.WritePerformance(currentContext);
try
{
this.Execute(ref currentContext);
Messages.WriteState(Enums.State.Idle);
}
catch (Exception e)
{
currentContext.Failed = true;
currentContext.CustomMessage = e.Message;
this.HandleException(e, false);
Messages.WriteState(Enums.State.Failed);
}
finally
{
currentContext.EndTime = DateTimeResolver.Resolve();
Messages.WriteDebug("Ended exection for {0}. Duration: {1}", this.DisplayName, currentContext.Duration);
Messages.WritePerformance(currentContext);
}
this._executionContexts.Remove(currentContext);
});
currentContext.Handle = executionTask;
}
this.CleanUpServiceAppContexts();
this.CheckParentProcessAlive();
}