IdleTimeoutMonitor.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / IdleTimeoutMonitor.cs / 1 / IdleTimeoutMonitor.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * 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.InitiateShutdown(); 
        }
    } 
}

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