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In Java FutureTask if the task Times out, does the Task get Cancelled?


In Java FutureTask if the task Times out, does the Task get Cancelled?

By : D. Andros
Date : November 20 2020, 11:01 PM
seems to work fine It continues to be executed.
By adding a second f.get(3, TimeUnit.SECONDS); you can retrieve the result:
code :
Object o2 = f.get(3, TimeUnit.SECONDS);
System.out.println("o2 = " + o2); // prints o2 = 3
f.cancel(true);
Object o2 = f.get(3, TimeUnit.SECONDS);


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java Callable FutureTask Excecuter: How to listen to finished task

java Callable FutureTask Excecuter: How to listen to finished task


By : user3185427
Date : March 29 2020, 07:55 AM
Does that help If you can make a specific assumption of using a java.util.concurrent.ThreadPoolExecutor, then you can use its hook methods; afterExecute() and beforeExecute().
http://download.oracle.com/javase/6/docs/api/java/util/concurrent/ThreadPoolExecutor.html
Why is a task continuation for a child task not triggered when parent is cancelled?

Why is a task continuation for a child task not triggered when parent is cancelled?


By : user3428025
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Now I know. The delegates in your task and nested task start right away. The nested task starts waiting 2000 ms, but it is already beyond the point where it checks the cancellation token. The 2000 ms wait in the nested task causes the continuation to cancel, because in the mean time the cancel token is cancelled. However, the continuation of the parent task has no cancellation token, so it always runs.
Edit: the point is that both tasks use the same cancellation token.
Handle cancelled task and task exceptions in Task.WaitAll?

Handle cancelled task and task exceptions in Task.WaitAll?


By : Joe vdH
Date : March 29 2020, 07:55 AM
this will help You can easily wrap a retry around GetStringAsync with a for loop that tries until there's no exception or the retry limit is reached. I store the task and extract the result from it using await so if the retry limit was reached without success, the exception would be rethrown:
code :
async Task<string> GetStringAsync(HttpClient client,string url, int retries)
{
    Task<string> task = null;
    for (int i = 0; i < retries; i++)
    {
        try
        {
            task = client.GetStringAsync(url);
            await task;
            break;
        }
        catch
        {
            // log
        }
    }

    return await task;
}
static async Task<string> GetStringAsync(this HttpClient client, string url, int retries);
Google Play services Task API: can a Task be cancelled

Google Play services Task API: can a Task be cancelled


By : Shashi Muley
Date : March 29 2020, 07:55 AM
wish helps you If you need a way to remove all the listeners from any Task at any time, you will have to remember all the listeners you previously added, then remove them all manually.
If you're working with an Android app, and you add Activity-scoped listeners, they will be removed automatically when the host activity is stopped (goes through its onStop() lifecycle method). Note that you have to pass the activity as an argument to addOnCompleteListener().
Writing a Task.WhenAll/WhenAny variant that cancels all other tasks on first faulted/Cancelled task

Writing a Task.WhenAll/WhenAny variant that cancels all other tasks on first faulted/Cancelled task


By : IncompleteJerk
Date : March 29 2020, 07:55 AM
it fixes the issue The CancellationToken class has no Cancel method. You need a CancellationTokenSource to be able to cancel the CancellationToken.
Similarly to affect the outcome of a task you need a TaskCompletionSource you can't safely cancel already running tasks. See this post
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