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//------------------------------------------------------------------------------
// <copyright file="RequestTimeoutManager.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
* Request timeout manager -- implements the request timeout mechanism
*/
namespace System.Web {
using System.Threading;
using System.Collections;
using System.Web.Hosting;
using System.Web.Util;
internal class IdleTimeoutMonitor {
private TimeSpan _idleTimeout; // the timeout value
private DateTime _lastEvent; // idle since this time
private Timer _timer;
private readonly TimeSpan _timerPeriod = new TimeSpan(0, 0, 30); // 30 secs
internal IdleTimeoutMonitor(TimeSpan timeout) {
_idleTimeout = timeout;
_timer = new Timer(new TimerCallback(this.TimerCompletionCallback), null, _timerPeriod, _timerPeriod);
_lastEvent = DateTime.UtcNow;
}
internal void Stop() {
// stop the timer
if (_timer != null) {
lock (this) {
if (_timer != null) {
((IDisposable)_timer).Dispose();
_timer = null;
}
}
}
}
internal DateTime LastEvent { // thread-safe property
get {
DateTime t;
lock (this) { t = _lastEvent; }
return t;
}
set {
lock (this) { _lastEvent = value; }
}
}
private void TimerCompletionCallback(Object state) {
// user idle timer to trim the free list of app instanced
HttpApplicationFactory.TrimApplicationInstances();
// no idle timeout
if (_idleTimeout == TimeSpan.MaxValue)
return;
// don't do idle timeout if already shutting down
if (HostingEnvironment.ShutdownInitiated)
return;
// check if there are active requests
if (HostingEnvironment.BusyCount != 0)
return;
// check if enough time passed
if (DateTime.UtcNow <= LastEvent.Add(_idleTimeout))
return;
// check if debugger is attached
if (System.Diagnostics.Debugger.IsAttached)
return;
// shutdown
HttpRuntime.SetShutdownReason(ApplicationShutdownReason.IdleTimeout,
SR.GetString(SR.Hosting_Env_IdleTimeout));
HostingEnvironment.InitiateShutdownWithoutDemand();
}
}
}
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