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//
// System.Timers.Timer
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2002 Ximian, Inc (http://www.ximian.com)
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// The docs talk about server timers and such...
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.ComponentModel;
using System.Threading;
namespace System.Timers
{
[DefaultEventAttribute("Elapsed")]
[DefaultProperty("Interval")]
public class Timer : Component, ISupportInitialize
{
bool autoReset;
bool enabled;
bool exiting;
double interval;
ISynchronizeInvoke so;
ManualResetEvent wait;
WeakReference weak_thread;
readonly object locker = new object ();
[Category("Behavior")]
[TimersDescription("Occurs when the Interval has elapsed.")]
public event ElapsedEventHandler Elapsed;
public Timer () : this (100)
{
}
public Timer (double interval)
{
#if NET_2_0
// MSBUG: https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=296761
if (interval > 0x7FFFFFFF)
throw new ArgumentException ("Invalid value: " + interval, "interval");
#endif
autoReset = true;
Interval = interval;
}
[Category("Behavior")]
[DefaultValue(true)]
[TimersDescription("Indicates whether the timer will be restarted when it is enabled.")]
public bool AutoReset
{
get { return autoReset; }
set { autoReset = value; }
}
[Category("Behavior")]
[DefaultValue(false)]
[TimersDescription("Indicates whether the timer is enabled to fire events at a defined interval.")]
public bool Enabled
{
get {
return enabled && !exiting;
}
set {
if (Enabled == value)
return;
enabled = value;
if (value) {
if (exiting)
StopTimer ();
exiting = false;
wait = new ManualResetEvent (false);
Thread thread = new Thread (new ThreadStart (StartTimer));
weak_thread = new WeakReference (thread);
thread.IsBackground = true;
thread.Start ();
} else {
StopTimer ();
}
}
}
[Category("Behavior")]
[DefaultValue(100)]
[RecommendedAsConfigurable(true)]
[TimersDescription( "The number of milliseconds between timer events.")]
public double Interval
{
get { return interval; }
set {
// The doc says 'less than 0', but 0 also throws the exception
if (value <= 0)
throw new ArgumentException ("Invalid value: " + value);
interval = value;
}
}
public override ISite Site
{
get { return base.Site; }
set { base.Site = value; }
}
[DefaultValue(null)]
[TimersDescriptionAttribute("The object used to marshal the event handler calls issued " +
"when an interval has elapsed.")]
#if NET_2_0
[Browsable (false)]
#endif
public ISynchronizeInvoke SynchronizingObject
{
get { return so; }
set { so = value; }
}
public void BeginInit ()
{
// Nothing to do
}
public void Close ()
{
Enabled = false;
}
public void EndInit ()
{
// Nothing to do
}
public void Start ()
{
Enabled = true;
}
public void Stop ()
{
Enabled = false;
}
protected override void Dispose (bool disposing)
{
Close ();
base.Dispose (disposing);
}
static void Callback (object state)
{
Timer timer = (Timer) state;
if (timer.Elapsed == null)
return;
ElapsedEventArgs arg = new ElapsedEventArgs (DateTime.Now);
if (timer.so != null && timer.so.InvokeRequired) {
timer.so.BeginInvoke (timer.Elapsed, new object [2] {timer, arg});
} else {
timer.Elapsed (timer, arg);
}
}
void StartTimer ()
{
WaitCallback wc = new WaitCallback (Callback);
while (wait.WaitOne ((int) interval, false) == false) {
exiting = !autoReset;
ThreadPool.QueueUserWorkItem (wc, this);
if (exiting)
break;
}
lock (locker) {
wait.Close ();
wait = null;
}
}
void StopTimer ()
{
lock (locker) {
if (wait != null)
wait.Set ();
}
// the sleep speeds up the join under linux
Thread.Sleep (0);
Thread thread = (Thread)weak_thread.Target;
if (thread != null)
thread.Join ();
}
}
}
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