How can I await a minimum amount of time?
Clash Royale CLAN TAG#URR8PPP
up vote
6
down vote
favorite
I have an async C# method where I am getting an HTTP resource, and I am doing it in an infinite loop. However I don't want to hit the resource too quickly. My current code is:
HttpClient http = new HttpClient();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
However, I want to be able to make sure I don't make an HTTP request more often than once per 10 seconds. So I want to start a 10 second timer at the beginning of the loop, and at the end say "await the completion of the 10 second timer". Is there a way to do this in C#.NET?
c# .net asynchronous
add a comment |Â
up vote
6
down vote
favorite
I have an async C# method where I am getting an HTTP resource, and I am doing it in an infinite loop. However I don't want to hit the resource too quickly. My current code is:
HttpClient http = new HttpClient();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
However, I want to be able to make sure I don't make an HTTP request more often than once per 10 seconds. So I want to start a 10 second timer at the beginning of the loop, and at the end say "await the completion of the 10 second timer". Is there a way to do this in C#.NET?
c# .net asynchronous
1
Yes. Suggest the Polly Framework
â Crowcoder
6 hours ago
add a comment |Â
up vote
6
down vote
favorite
up vote
6
down vote
favorite
I have an async C# method where I am getting an HTTP resource, and I am doing it in an infinite loop. However I don't want to hit the resource too quickly. My current code is:
HttpClient http = new HttpClient();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
However, I want to be able to make sure I don't make an HTTP request more often than once per 10 seconds. So I want to start a 10 second timer at the beginning of the loop, and at the end say "await the completion of the 10 second timer". Is there a way to do this in C#.NET?
c# .net asynchronous
I have an async C# method where I am getting an HTTP resource, and I am doing it in an infinite loop. However I don't want to hit the resource too quickly. My current code is:
HttpClient http = new HttpClient();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
However, I want to be able to make sure I don't make an HTTP request more often than once per 10 seconds. So I want to start a 10 second timer at the beginning of the loop, and at the end say "await the completion of the 10 second timer". Is there a way to do this in C#.NET?
c# .net asynchronous
c# .net asynchronous
asked 6 hours ago
Jez
11.2k1878144
11.2k1878144
1
Yes. Suggest the Polly Framework
â Crowcoder
6 hours ago
add a comment |Â
1
Yes. Suggest the Polly Framework
â Crowcoder
6 hours ago
1
1
Yes. Suggest the Polly Framework
â Crowcoder
6 hours ago
Yes. Suggest the Polly Framework
â Crowcoder
6 hours ago
add a comment |Â
5 Answers
5
active
oldest
votes
up vote
4
down vote
accepted
At the simplest:
while (true)
var rateLimit = Task.Delay(TimeSpan.FromSeconds(10));
// ...await your http/whatever
await rateLimit;
The await rateLimit
will complete immediately if the http work took over the 10 seconds.
However, you may choose to compare the times before and after the http work, to see if you even need to wait; more like:
while (true)
var timeBefore = ...
// ...await your http/whatever
var timeAfter = ...
// ... calculate time left
if (timeLeft > TimeSpan.Zero) await Task.Delay(timeLeft);
This avoids the plumbing needed for Task.Delay
in the scenarios where it would complete immediately.
Does thatTask.Delay
plumbing really add much overhead?
â Jez
6 hours ago
1
@Jez context is everything; I don't know your scenario! if you have large concurrency, I would try to avoid it - it hooks intoTimer
; nothing too bad, but worth avoiding if not needed in some cases
â Marc Gravellâ¦
6 hours ago
add a comment |Â
up vote
4
down vote
Create a StopWatch
(and start it) when you start the loop.
Then when GetAsync
method returns, you read the ElapsedMilliseconds. Subtract this value from 10000. Now do:
await Task.Delay(yourValue);
Now it takes min. 10 seconds for a loop.
The code:
while (true)
// Long-poll the API
StopWatch sw = StopWatch.StartNew();
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
int milliseconds = 10000 - sw.ElapsedMilliSeconds;
if (milliseconds > 0)
await Task.Delay(milliseconds);
add a comment |Â
up vote
3
down vote
You can use a simple StopWatch
for this, and use Task.Delay
to wait the required time, if any.
const int minimumTime = 10_000;
var sw = StopWatch.StartNew();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
int difference = minimumTime - sw.EllapsedMiliseconds;
if (difference > 0)
await Task.Delay(difference);
sw.Restart();
This, however, is only for the case that you want 10 seconds between each call. If the API takes 9 seconds to complete, you'd get 2 calls in a second.
If you want to always wait 10 seconds, regardless of how much it took the API to complete, just use:
const int waitTime = 10_000;
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
await Task.Delay(waitTime);
add a comment |Â
up vote
1
down vote
Not sure if that's exactly what you are looking for, but Task.Delay can suspend the loop for the given milliseconds.
while (true)
...
await Task.Delay(10 * 1000);
add a comment |Â
up vote
1
down vote
You could use CancellationTokenSource
combined with TaskCompletionSource
to create a "delay" task that starts when your request starts, and which you await when your request is complete:
private static Task GetDelayTask(TimeSpan delay, object state = null)
var taskSource = new TaskCompletionSource<object>();
var cts = new CancellationTokenSource(delay);
cts.Token.Register(() =>
taskSource.SetResult(state);
cts.Dispose();
);
return taskSource.Task;
Usage:
HttpClient http = new HttpClient();
while (true)
var delayTask = GetDelayTask(TimeSpan.FromSeconds(10));
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
await delayTask;
add a comment |Â
5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
4
down vote
accepted
At the simplest:
while (true)
var rateLimit = Task.Delay(TimeSpan.FromSeconds(10));
// ...await your http/whatever
await rateLimit;
The await rateLimit
will complete immediately if the http work took over the 10 seconds.
However, you may choose to compare the times before and after the http work, to see if you even need to wait; more like:
while (true)
var timeBefore = ...
// ...await your http/whatever
var timeAfter = ...
// ... calculate time left
if (timeLeft > TimeSpan.Zero) await Task.Delay(timeLeft);
This avoids the plumbing needed for Task.Delay
in the scenarios where it would complete immediately.
Does thatTask.Delay
plumbing really add much overhead?
â Jez
6 hours ago
1
@Jez context is everything; I don't know your scenario! if you have large concurrency, I would try to avoid it - it hooks intoTimer
; nothing too bad, but worth avoiding if not needed in some cases
â Marc Gravellâ¦
6 hours ago
add a comment |Â
up vote
4
down vote
accepted
At the simplest:
while (true)
var rateLimit = Task.Delay(TimeSpan.FromSeconds(10));
// ...await your http/whatever
await rateLimit;
The await rateLimit
will complete immediately if the http work took over the 10 seconds.
However, you may choose to compare the times before and after the http work, to see if you even need to wait; more like:
while (true)
var timeBefore = ...
// ...await your http/whatever
var timeAfter = ...
// ... calculate time left
if (timeLeft > TimeSpan.Zero) await Task.Delay(timeLeft);
This avoids the plumbing needed for Task.Delay
in the scenarios where it would complete immediately.
Does thatTask.Delay
plumbing really add much overhead?
â Jez
6 hours ago
1
@Jez context is everything; I don't know your scenario! if you have large concurrency, I would try to avoid it - it hooks intoTimer
; nothing too bad, but worth avoiding if not needed in some cases
â Marc Gravellâ¦
6 hours ago
add a comment |Â
up vote
4
down vote
accepted
up vote
4
down vote
accepted
At the simplest:
while (true)
var rateLimit = Task.Delay(TimeSpan.FromSeconds(10));
// ...await your http/whatever
await rateLimit;
The await rateLimit
will complete immediately if the http work took over the 10 seconds.
However, you may choose to compare the times before and after the http work, to see if you even need to wait; more like:
while (true)
var timeBefore = ...
// ...await your http/whatever
var timeAfter = ...
// ... calculate time left
if (timeLeft > TimeSpan.Zero) await Task.Delay(timeLeft);
This avoids the plumbing needed for Task.Delay
in the scenarios where it would complete immediately.
At the simplest:
while (true)
var rateLimit = Task.Delay(TimeSpan.FromSeconds(10));
// ...await your http/whatever
await rateLimit;
The await rateLimit
will complete immediately if the http work took over the 10 seconds.
However, you may choose to compare the times before and after the http work, to see if you even need to wait; more like:
while (true)
var timeBefore = ...
// ...await your http/whatever
var timeAfter = ...
// ... calculate time left
if (timeLeft > TimeSpan.Zero) await Task.Delay(timeLeft);
This avoids the plumbing needed for Task.Delay
in the scenarios where it would complete immediately.
answered 6 hours ago
Marc Gravellâ¦
767k19021112523
767k19021112523
Does thatTask.Delay
plumbing really add much overhead?
â Jez
6 hours ago
1
@Jez context is everything; I don't know your scenario! if you have large concurrency, I would try to avoid it - it hooks intoTimer
; nothing too bad, but worth avoiding if not needed in some cases
â Marc Gravellâ¦
6 hours ago
add a comment |Â
Does thatTask.Delay
plumbing really add much overhead?
â Jez
6 hours ago
1
@Jez context is everything; I don't know your scenario! if you have large concurrency, I would try to avoid it - it hooks intoTimer
; nothing too bad, but worth avoiding if not needed in some cases
â Marc Gravellâ¦
6 hours ago
Does that
Task.Delay
plumbing really add much overhead?â Jez
6 hours ago
Does that
Task.Delay
plumbing really add much overhead?â Jez
6 hours ago
1
1
@Jez context is everything; I don't know your scenario! if you have large concurrency, I would try to avoid it - it hooks into
Timer
; nothing too bad, but worth avoiding if not needed in some casesâ Marc Gravellâ¦
6 hours ago
@Jez context is everything; I don't know your scenario! if you have large concurrency, I would try to avoid it - it hooks into
Timer
; nothing too bad, but worth avoiding if not needed in some casesâ Marc Gravellâ¦
6 hours ago
add a comment |Â
up vote
4
down vote
Create a StopWatch
(and start it) when you start the loop.
Then when GetAsync
method returns, you read the ElapsedMilliseconds. Subtract this value from 10000. Now do:
await Task.Delay(yourValue);
Now it takes min. 10 seconds for a loop.
The code:
while (true)
// Long-poll the API
StopWatch sw = StopWatch.StartNew();
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
int milliseconds = 10000 - sw.ElapsedMilliSeconds;
if (milliseconds > 0)
await Task.Delay(milliseconds);
add a comment |Â
up vote
4
down vote
Create a StopWatch
(and start it) when you start the loop.
Then when GetAsync
method returns, you read the ElapsedMilliseconds. Subtract this value from 10000. Now do:
await Task.Delay(yourValue);
Now it takes min. 10 seconds for a loop.
The code:
while (true)
// Long-poll the API
StopWatch sw = StopWatch.StartNew();
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
int milliseconds = 10000 - sw.ElapsedMilliSeconds;
if (milliseconds > 0)
await Task.Delay(milliseconds);
add a comment |Â
up vote
4
down vote
up vote
4
down vote
Create a StopWatch
(and start it) when you start the loop.
Then when GetAsync
method returns, you read the ElapsedMilliseconds. Subtract this value from 10000. Now do:
await Task.Delay(yourValue);
Now it takes min. 10 seconds for a loop.
The code:
while (true)
// Long-poll the API
StopWatch sw = StopWatch.StartNew();
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
int milliseconds = 10000 - sw.ElapsedMilliSeconds;
if (milliseconds > 0)
await Task.Delay(milliseconds);
Create a StopWatch
(and start it) when you start the loop.
Then when GetAsync
method returns, you read the ElapsedMilliseconds. Subtract this value from 10000. Now do:
await Task.Delay(yourValue);
Now it takes min. 10 seconds for a loop.
The code:
while (true)
// Long-poll the API
StopWatch sw = StopWatch.StartNew();
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
int milliseconds = 10000 - sw.ElapsedMilliSeconds;
if (milliseconds > 0)
await Task.Delay(milliseconds);
edited 5 hours ago
answered 6 hours ago
Poul Bak
4,4692631
4,4692631
add a comment |Â
add a comment |Â
up vote
3
down vote
You can use a simple StopWatch
for this, and use Task.Delay
to wait the required time, if any.
const int minimumTime = 10_000;
var sw = StopWatch.StartNew();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
int difference = minimumTime - sw.EllapsedMiliseconds;
if (difference > 0)
await Task.Delay(difference);
sw.Restart();
This, however, is only for the case that you want 10 seconds between each call. If the API takes 9 seconds to complete, you'd get 2 calls in a second.
If you want to always wait 10 seconds, regardless of how much it took the API to complete, just use:
const int waitTime = 10_000;
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
await Task.Delay(waitTime);
add a comment |Â
up vote
3
down vote
You can use a simple StopWatch
for this, and use Task.Delay
to wait the required time, if any.
const int minimumTime = 10_000;
var sw = StopWatch.StartNew();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
int difference = minimumTime - sw.EllapsedMiliseconds;
if (difference > 0)
await Task.Delay(difference);
sw.Restart();
This, however, is only for the case that you want 10 seconds between each call. If the API takes 9 seconds to complete, you'd get 2 calls in a second.
If you want to always wait 10 seconds, regardless of how much it took the API to complete, just use:
const int waitTime = 10_000;
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
await Task.Delay(waitTime);
add a comment |Â
up vote
3
down vote
up vote
3
down vote
You can use a simple StopWatch
for this, and use Task.Delay
to wait the required time, if any.
const int minimumTime = 10_000;
var sw = StopWatch.StartNew();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
int difference = minimumTime - sw.EllapsedMiliseconds;
if (difference > 0)
await Task.Delay(difference);
sw.Restart();
This, however, is only for the case that you want 10 seconds between each call. If the API takes 9 seconds to complete, you'd get 2 calls in a second.
If you want to always wait 10 seconds, regardless of how much it took the API to complete, just use:
const int waitTime = 10_000;
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
await Task.Delay(waitTime);
You can use a simple StopWatch
for this, and use Task.Delay
to wait the required time, if any.
const int minimumTime = 10_000;
var sw = StopWatch.StartNew();
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
int difference = minimumTime - sw.EllapsedMiliseconds;
if (difference > 0)
await Task.Delay(difference);
sw.Restart();
This, however, is only for the case that you want 10 seconds between each call. If the API takes 9 seconds to complete, you'd get 2 calls in a second.
If you want to always wait 10 seconds, regardless of how much it took the API to complete, just use:
const int waitTime = 10_000;
while (true)
// Long-poll the API
var response = await http.GetAsync(buildUri());
...
await Task.Delay(waitTime);
edited 6 hours ago
answered 6 hours ago
Camilo Terevinto
17k63261
17k63261
add a comment |Â
add a comment |Â
up vote
1
down vote
Not sure if that's exactly what you are looking for, but Task.Delay can suspend the loop for the given milliseconds.
while (true)
...
await Task.Delay(10 * 1000);
add a comment |Â
up vote
1
down vote
Not sure if that's exactly what you are looking for, but Task.Delay can suspend the loop for the given milliseconds.
while (true)
...
await Task.Delay(10 * 1000);
add a comment |Â
up vote
1
down vote
up vote
1
down vote
Not sure if that's exactly what you are looking for, but Task.Delay can suspend the loop for the given milliseconds.
while (true)
...
await Task.Delay(10 * 1000);
Not sure if that's exactly what you are looking for, but Task.Delay can suspend the loop for the given milliseconds.
while (true)
...
await Task.Delay(10 * 1000);
answered 6 hours ago
MichaC
10.8k23148
10.8k23148
add a comment |Â
add a comment |Â
up vote
1
down vote
You could use CancellationTokenSource
combined with TaskCompletionSource
to create a "delay" task that starts when your request starts, and which you await when your request is complete:
private static Task GetDelayTask(TimeSpan delay, object state = null)
var taskSource = new TaskCompletionSource<object>();
var cts = new CancellationTokenSource(delay);
cts.Token.Register(() =>
taskSource.SetResult(state);
cts.Dispose();
);
return taskSource.Task;
Usage:
HttpClient http = new HttpClient();
while (true)
var delayTask = GetDelayTask(TimeSpan.FromSeconds(10));
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
await delayTask;
add a comment |Â
up vote
1
down vote
You could use CancellationTokenSource
combined with TaskCompletionSource
to create a "delay" task that starts when your request starts, and which you await when your request is complete:
private static Task GetDelayTask(TimeSpan delay, object state = null)
var taskSource = new TaskCompletionSource<object>();
var cts = new CancellationTokenSource(delay);
cts.Token.Register(() =>
taskSource.SetResult(state);
cts.Dispose();
);
return taskSource.Task;
Usage:
HttpClient http = new HttpClient();
while (true)
var delayTask = GetDelayTask(TimeSpan.FromSeconds(10));
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
await delayTask;
add a comment |Â
up vote
1
down vote
up vote
1
down vote
You could use CancellationTokenSource
combined with TaskCompletionSource
to create a "delay" task that starts when your request starts, and which you await when your request is complete:
private static Task GetDelayTask(TimeSpan delay, object state = null)
var taskSource = new TaskCompletionSource<object>();
var cts = new CancellationTokenSource(delay);
cts.Token.Register(() =>
taskSource.SetResult(state);
cts.Dispose();
);
return taskSource.Task;
Usage:
HttpClient http = new HttpClient();
while (true)
var delayTask = GetDelayTask(TimeSpan.FromSeconds(10));
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
await delayTask;
You could use CancellationTokenSource
combined with TaskCompletionSource
to create a "delay" task that starts when your request starts, and which you await when your request is complete:
private static Task GetDelayTask(TimeSpan delay, object state = null)
var taskSource = new TaskCompletionSource<object>();
var cts = new CancellationTokenSource(delay);
cts.Token.Register(() =>
taskSource.SetResult(state);
cts.Dispose();
);
return taskSource.Task;
Usage:
HttpClient http = new HttpClient();
while (true)
var delayTask = GetDelayTask(TimeSpan.FromSeconds(10));
// Long-poll the API
var response = await http.GetAsync(buildUri());
Console.WriteLine("Resp: " + response.ToString());
Console.WriteLine("CONTENT:");
Console.WriteLine(await response.Content.ReadAsStringAsync());
await delayTask;
answered 6 hours ago
John
10k31734
10k31734
add a comment |Â
add a comment |Â
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1
Yes. Suggest the Polly Framework
â Crowcoder
6 hours ago