C#事件去抖动
我正在收听一条硬件事件消息，但我需要对其进行去抖动，以避免太多查询C#事件去抖动,c#,events,debouncing,C#,Events,Debouncing,我正在收听一条硬件事件消息，但我需要对其进行去抖动，以避免太多查询 这是一个发送机器状态的硬件事件，出于统计目的，我必须将其存储在数据库中，有时它的状态经常发生变化（闪烁？）。在这种情况下，我只想存储一个“稳定”状态，我想通过在将状态存储到数据库之前等待1-2秒来实现它 这是我的代码： private MachineClass connect() { try { MachineClass rpc = new MachineClass(); rpc.
这是一个发送机器状态的硬件事件，出于统计目的，我必须将其存储在数据库中，有时它的状态经常发生变化（闪烁？）。在这种情况下，我只想存储一个“稳定”状态，我想通过在将状态存储到数据库之前等待1-2秒来实现它 这是我的代码：
private MachineClass connect()
{
try
{
MachineClass rpc = new MachineClass();
rpc.RxVARxH += eventRxVARxH;
return rpc;
}
catch (Exception e1)
{
log.Error(e1.Message);
return null;
}
}
private void eventRxVARxH(MachineClass Machine)
{
log.Debug("Event fired");
}
我将这种行为称为“去抖动”：等待几次以真正完成其工作：如果在去抖动时间内再次触发相同的事件，我必须取消第一个请求，并开始等待去抖动时间以完成第二个事件 管理它的最佳选择是什么？只是一个一次性计时器 要解释“去盎司”功能，请参见以下关键事件的javascript实现：
只要记住最新的“热门歌曲：
DateTime latestHit = DatetIme.MinValue;
private void eventRxVARxH(MachineClass Machine)
{
log.Debug("Event fired");
if(latestHit - DateTime.Now < TimeSpan.FromXYZ() // too fast
{
// ignore second hit, too fast
return;
}
latestHit = DateTime.Now;
// it was slow enough, do processing
...
}
DateTime latestHit=DateTime.MinValue；
私有void eventRxVARxH（MachineClass Machine）
{
log.Debug（“触发事件”）；
if（latestHit-DateTime.NowDateTime latestHit = DatetIme.MinValue;
Machine historicEvent;
private void eventRxVARxH(MachineClass Machine)
{
log.Debug("Event fired");
if(latestHit - DateTime.Now < TimeSpan.FromXYZ() // too fast
{
// ignore second hit, too fast
historicEvent = Machine; // or some property
return;
}
latestHit = DateTime.Now;
// it was slow enough, do processing
...
// process historicEvent
...
historicEvent = Machine;
}
DateTime latestHit=DateTime.MinValue；
机器历史事件；
私有void eventRxVARxH（MachineClass Machine）
{
log.Debug（“触发事件”）；
if（latestHit-DateTime.NowSubject<MyEventData> _mySubject=new Subject<MyEventData>();
....
var eventSequenc=mySubject.Throttle(TimeSpan.FromSeconds(1))
.Subscribe(events=>MySubscriptionMethod(events));
var mySequence=Observable.FromEventPattern(
h=>\u myDevice.MyEvent+=h，
h=>\u myDevice.MyEvent-=h）；
_mySequence.节流阀（时间跨度从秒（1））
.Subscribe（events=>MySubscriptionMethod（events））；
IObservable<MachineClass> _myObservable;
private MachineClass connect()
{
MachineClass rpc = new MachineClass();
_myObservable=Observable
.FromEventPattern<MachineClass>(
h=> rpc.RxVARxH += h,
h=> rpc.RxVARxH -= h)
.Throttle(TimeSpan.FromSeconds(1));
_myObservable.Subscribe(machine=>eventRxVARxH(machine));
return rpc;
}
ioobservable\u myObservable；
专用计算机类连接（）
{
MachineClass rpc=新MachineClass（）；
_可观察的
.FromEventPattern(
h=>rpc.RxVARxH+=h，
h=>rpc.RxVARxH-=h）
.节气门（时间跨度从秒（1））；
_Subscribe（machine=>eventRxVARxH（machine））；
返回rpc；
}
当然，这可以得到极大的改进-可观察到的和订阅都需要在某一点上进行处理。此代码假设您只控制一个设备。如果您有多个设备，则可以在类内创建可观察到的，以便每个MachineClass公开和处理其自己的可观察到的。我已经使用此方法来解除Bounce一些成功的活动：
public static Action<T> Debounce<T>(this Action<T> func, int milliseconds = 300)
{
var last = 0;
return arg =>
{
var current = Interlocked.Increment(ref last);
Task.Delay(milliseconds).ContinueWith(task =>
{
if (current == last) func(arg);
task.Dispose();
});
};
}
public静态动作反Bounce（此动作func，int毫秒=300）
{
var last=0；
返回arg=>
{
无功电流=联锁增量（参考最后一次）；
Task.Delay（毫秒）。ContinueWith（Task=>
{
如果（当前==上次）函数（参数）；
task.Dispose（）；
});
};
}
动作a=（arg）=>
{
//这是成功的取消公告。。。
控制台写入线（arg）；
};
var debouncedWrapper=a.Debounce（）；
while（true）
{
var rndVal=下一个（400）rnd；
睡眠（rndVal）；
去BouncedWrapper（rndVal）；
}
public static Action<T> Debounce<T>(this Action<T> func, int milliseconds = 300)
{
CancellationTokenSource? cancelTokenSource = null;
return arg =>
{
cancelTokenSource?.Cancel();
cancelTokenSource = new CancellationTokenSource();
Task.Delay(milliseconds, cancelTokenSource.Token)
.ContinueWith(t =>
{
if (t.IsCompletedSuccessfully)
{
func(arg);
}
}, TaskScheduler.Default);
};
}
public静态动作反Bounce（此动作func，int毫秒=300）
{
CancellationTokenSource？cancelTokenSource=null；
返回arg=>
{
cancelTokenSource？.Cancel（）；
cancelTokenSource=新的CancellationTokenSource（）；
Task.Delay（毫秒，cancelTokenSource.Token）
.ContinueWith（t=>
{
如果（t.IsCompletedSuccessfully）
{
func（arg）；
}
public static Action<T> Debounce<T>(this Action<T> func, int milliseconds = 300)
{
var last = 0;
return arg =>
{
var current = Interlocked.Increment(ref last);
Task.Delay(milliseconds).ContinueWith(task =>
{
if (current == last) func(arg);
task.Dispose();
});
};
}
Action<int> a = (arg) =>
{
// This was successfully debounced...
Console.WriteLine(arg);
};
var debouncedWrapper = a.Debounce<int>();
while (true)
{
var rndVal = rnd.Next(400);
Thread.Sleep(rndVal);
debouncedWrapper(rndVal);
}
public static Action<T> Debounce<T>(this Action<T> func, int milliseconds = 300)
{
CancellationTokenSource? cancelTokenSource = null;
return arg =>
{
cancelTokenSource?.Cancel();
cancelTokenSource = new CancellationTokenSource();
Task.Delay(milliseconds, cancelTokenSource.Token)
.ContinueWith(t =>
{
if (t.IsCompletedSuccessfully)
{
func(arg);
}
}, TaskScheduler.Default);
};
}
private Subject<string> typingSubject = new Subject<string> ();
private IDisposable typingEventSequence;
private void Init () {
var searchText = layoutView.FindViewById<EditText> (Resource.Id.search_text);
searchText.TextChanged += SearchTextChanged;
typingEventSequence = typingSubject.Throttle (TimeSpan.FromSeconds (1))
.Subscribe (query => suggestionsAdapter.Get (query));
}
private void SearchTextChanged (object sender, TextChangedEventArgs e) {
var searchText = layoutView.FindViewById<EditText> (Resource.Id.search_text);
typingSubject.OnNext (searchText.Text.Trim ());
}
public override void OnDestroy () {
if (typingEventSequence != null)
typingEventSequence.Dispose ();
base.OnDestroy ();
}
public class DebounceDispatcher
{
private DispatcherTimer timer;
private DateTime timerStarted { get; set; } = DateTime.UtcNow.AddYears(-1);
public void Debounce(int interval, Action<object> action,
object param = null,
DispatcherPriority priority = DispatcherPriority.ApplicationIdle,
Dispatcher disp = null)
{
// kill pending timer and pending ticks
timer?.Stop();
timer = null;
if (disp == null)
disp = Dispatcher.CurrentDispatcher;
// timer is recreated for each event and effectively
// resets the timeout. Action only fires after timeout has fully
// elapsed without other events firing in between
timer = new DispatcherTimer(TimeSpan.FromMilliseconds(interval), priority, (s, e) =>
{
if (timer == null)
return;
timer?.Stop();
timer = null;
action.Invoke(param);
}, disp);
timer.Start();
}
}
private DebounceDispatcher debounceTimer = new DebounceDispatcher();
private void TextSearchText_KeyUp(object sender, KeyEventArgs e)
{
debounceTimer.Debounce(500, parm =>
{
Model.AppModel.Window.ShowStatus("Searching topics...");
Model.TopicsFilter = TextSearchText.Text;
Model.AppModel.Window.ShowStatus();
});
}
public void Throttle(int interval, Action<object> action,
object param = null,
DispatcherPriority priority = DispatcherPriority.ApplicationIdle,
Dispatcher disp = null)
{
// kill pending timer and pending ticks
timer?.Stop();
timer = null;
if (disp == null)
disp = Dispatcher.CurrentDispatcher;
var curTime = DateTime.UtcNow;
// if timeout is not up yet - adjust timeout to fire
// with potentially new Action parameters
if (curTime.Subtract(timerStarted).TotalMilliseconds < interval)
interval = (int) curTime.Subtract(timerStarted).TotalMilliseconds;
timer = new DispatcherTimer(TimeSpan.FromMilliseconds(interval), priority, (s, e) =>
{
if (timer == null)
return;
timer?.Stop();
timer = null;
action.Invoke(param);
}, disp);
timer.Start();
timerStarted = curTime;
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
namespace MyApplication
{
public class Debouncer : IDisposable
{
readonly TimeSpan _ts;
readonly Action _action;
readonly HashSet<ManualResetEvent> _resets = new HashSet<ManualResetEvent>();
readonly object _mutex = new object();
public Debouncer(TimeSpan timespan, Action action)
{
_ts = timespan;
_action = action;
}
public void Invoke()
{
var thisReset = new ManualResetEvent(false);
lock (_mutex)
{
while (_resets.Count > 0)
{
var otherReset = _resets.First();
_resets.Remove(otherReset);
otherReset.Set();
}
_resets.Add(thisReset);
}
ThreadPool.QueueUserWorkItem(_ =>
{
try
{
if (!thisReset.WaitOne(_ts))
{
_action();
}
}
finally
{
lock (_mutex)
{
using (thisReset)
_resets.Remove(thisReset);
}
}
});
}
public void Dispose()
{
lock (_mutex)
{
while (_resets.Count > 0)
{
var reset = _resets.First();
_resets.Remove(reset);
reset.Set();
}
}
}
}
}
public partial class Example : Form
{
private readonly Debouncer _searchDebouncer;
public Example()
{
InitializeComponent();
_searchDebouncer = new Debouncer(TimeSpan.FromSeconds(.75), Search);
txtSearchText.TextChanged += txtSearchText_TextChanged;
}
private void txtSearchText_TextChanged(object sender, EventArgs e)
{
_searchDebouncer.Invoke();
}
private void Search()
{
if (InvokeRequired)
{
Invoke((Action)Search);
return;
}
if (!string.IsNullOrEmpty(txtSearchText.Text))
{
// Search here
}
}
}
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
namespace OrderScanner.Models
{
class Debouncer
{
private List<CancellationTokenSource> StepperCancelTokens = new List<CancellationTokenSource>();
private int MillisecondsToWait;
private readonly object _lockThis = new object(); // Use a locking object to prevent the debouncer to trigger again while the func is still running
public Debouncer(int millisecondsToWait = 300)
{
this.MillisecondsToWait = millisecondsToWait;
}
public void Debouce(Action func)
{
CancelAllStepperTokens(); // Cancel all api requests;
var newTokenSrc = new CancellationTokenSource();
lock (_lockThis)
{
StepperCancelTokens.Add(newTokenSrc);
}
Task.Delay(MillisecondsToWait, newTokenSrc.Token).ContinueWith(task => // Create new request
{
if (!newTokenSrc.IsCancellationRequested) // if it hasn't been cancelled
{
CancelAllStepperTokens(); // Cancel any that remain (there shouldn't be any)
StepperCancelTokens = new List<CancellationTokenSource>(); // set to new list
lock (_lockThis)
{
func(); // run
}
}
}, TaskScheduler.FromCurrentSynchronizationContext());
}
private void CancelAllStepperTokens()
{
foreach (var token in StepperCancelTokens)
{
if (!token.IsCancellationRequested)
{
token.Cancel();
}
}
}
}
}
private Debouncer StepperDeboucer = new Debouncer(1000); // one second
StepperDeboucer.Debouce(() => { WhateverMethod(args) });
private Task _debounceTask = Task.CompletedTask;
private volatile Action _debounceAction;
/// <summary>
/// Debounces anything passed through this
/// function to happen at most every three seconds
/// </summary>
/// <param name="act">An action to run</param>
private async void DebounceAction(Action act)
{
_debounceAction = act;
await _debounceTask;
if (_debounceAction == act)
{
_debounceTask = Task.Delay(3000);
act();
}
}
TIME: 1e&a2e&a3e&a4e&a5e&a6e&a7e&a8e&a9e&a0e&a
EVENT: A B C D E F
OBSERVED: A B E F
using System.Threading;
Timer delayedActionTimer;
public MyClass()
{
// Setup our timer
delayedActionTimer = new Timer(saveOrWhatever, // The method to call when triggered
null, // State object (Not required)
Timeout.Infinite, // Start disabled
Timeout.Infinite); // Don't repeat the trigger
}
// A change was made that we want to save but not until a
// reasonable amount of time between changes has gone by
// so that we're not saving on every keystroke/trigger event.
public void TextChanged()
{
delayedActionTimer.Change(3000, // Trigger this timers function in 3 seconds,
// overwriting any existing countdown
Timeout.Infinite); // Don't repeat this trigger; Only fire once
}
// Timer requires the method take an Object which we've set to null since we don't
// need it for this example
private void saveOrWhatever(Object obj)
{
/*Do the thing*/
}
public static Action Debounce(this Action action, int milliseconds = 300)
{
CancellationTokenSource lastCToken = null;
return () =>
{
//Cancel/dispose previous
lastCToken?.Cancel();
try {
lastCToken?.Dispose();
} catch {}
var tokenSrc = lastCToken = new CancellationTokenSource();
Task.Delay(milliseconds).ContinueWith(task => { action(); }, tokenSrc.Token);
};
}
Action DebounceToConsole;
int count = 0;
void Main()
{
//Assign
DebounceToConsole = ((Action)ToConsole).Debounce(50);
var random = new Random();
for (int i = 0; i < 50; i++)
{
DebounceToConsole();
Thread.Sleep(random.Next(100));
}
}
public void ToConsole()
{
Console.WriteLine($"I ran for the {++count} time.");
}
class Debouncer: IDisposable
{
private CancellationTokenSource lastCToken;
private int milliseconds;
public Debouncer(int milliseconds = 300)
{
this.milliseconds = milliseconds;
}
public void Debounce(Action action)
{
Cancel(lastCToken);
var tokenSrc = lastCToken = new CancellationTokenSource();
Task.Delay(milliseconds).ContinueWith(task =>
{
action();
},
tokenSrc.Token
);
}
public void Cancel(CancellationTokenSource source)
{
if (source != null)
{
source.Cancel();
source.Dispose();
}
}
public void Dispose()
{
Cancel(lastCToken);
}
~Debouncer()
{
Dispose();
}
}
private Debouncer debouncer = new Debouncer(500); //1/2 a second
...
debouncer.Debounce(SomeAction);
private IObservable<EventPattern<TextChangedEventArgs>> textChanged;
// Debouncing capability
textChanged = Observable.FromEventPattern<TextChangedEventArgs>(txtSearch, "TextChanged");
textChanged.ObserveOnDispatcher().Throttle(TimeSpan.FromSeconds(1)).Subscribe(args => {
Debug.WriteLine("bounce!");
});
public static class Debouncer
{
static ConcurrentDictionary<string, CancellationTokenSource> _tokens = new ConcurrentDictionary<string, CancellationTokenSource>();
public static void Debounce(string uniqueKey, Action action, int seconds)
{
var token = _tokens.AddOrUpdate(uniqueKey,
(key) => //key not found - create new
{
return new CancellationTokenSource();
},
(key, existingToken) => //key found - cancel task and recreate
{
existingToken.Cancel(); //cancel previous
return new CancellationTokenSource();
}
);
Task.Delay(seconds * 1000, token.Token).ContinueWith(task =>
{
if (!task.IsCanceled)
{
action();
_tokens.TryRemove(uniqueKey, out _);
}
}, token.Token);
}
}
//throttle for 5 secs if it's already been called with this KEY
Debouncer.Debounce("Some-Unique-ID", () => SendEmails(), 5);
Debouncer.Debounce("Some-Unique-ID", () =>
{
//do some work here
}, 5);