/// <summary>
///
/// </summary>
/// <param name="pool"></param>
/// <param name="threadName"></param>
/// <param name="breakoutInterval"></param>
/// <param name="taskQueue"></param>
protected SingleThreadEventExecutor(IThreadPoolExecutor pool, string threadName, TimeSpan breakoutInterval, IQueue <IRunnable> taskQueue)
: base(pool)
{
this.terminationCompletionSource = new TaskCompletionSource();
this.taskQueue = taskQueue;
this.preciseBreakoutInterval = PreciseTimeSpan.FromTimeSpan(breakoutInterval);
this.scheduler = new ExecutorTaskScheduler(this);
this.thread = new Thread(this.Loop);
if (string.IsNullOrEmpty(threadName))
{
this.thread.Name = DefaultWorkerThreadName;
}
else
{
this.thread.Name = threadName;
}
this.thread.Start();
}
/// <inheritdoc cref="IEventExecutor"/>
public override Task ShutdownGracefullyAsync(TimeSpan quietPeriod, TimeSpan timeout)
{
Contract.Requires(quietPeriod >= TimeSpan.Zero);
Contract.Requires(timeout >= quietPeriod);
if (this.IsShuttingDown)
{
return(this.TerminationCompletion);
}
bool inEventLoop = this.InEventLoop;
bool wakeup;
int oldState;
while (true)
{
if (this.IsShuttingDown)
{
return(this.TerminationCompletion);
}
int newState;
wakeup = true;
oldState = this.executionState;
if (inEventLoop)
{
newState = ST_SHUTTING_DOWN;
}
else
{
switch (oldState)
{
case ST_NOT_STARTED:
case ST_STARTED:
newState = ST_SHUTTING_DOWN;
break;
default:
newState = oldState;
wakeup = false;
break;
}
}
if (Interlocked.CompareExchange(ref this.executionState, newState, oldState) == oldState)
{
break;
}
}
this.gracefulShutdownQuietPeriod = PreciseTimeSpan.FromTimeSpan(quietPeriod);
this.gracefulShutdownTimeout = PreciseTimeSpan.FromTimeSpan(timeout);
// todo: revisit
//if (oldState == ST_NOT_STARTED)
//{
// scheduleExecution();
//}
if (wakeup)
{
this.WakeUp(inEventLoop);
}
return(this.TerminationCompletion);
}