All Questions
9 questions
-1
votes
1
answer
351
views
Need help for CompletableFuture or Callable Future
I am facing issue for finding out which will be the best way for my below scenario.
I wanted to call 1 API by using multiple threads at a time and wanted to merge their response to make a list.
First ...
- 457
0
votes
0
answers
193
views
Java - read a file using executor service gives error 409
How to read same file twice, in different tasks using executor service?
I used below sample code structure, but while reading same file simultaneously gives 409 error. How to resolve it?
//Sample ...
user10386436
2
votes
1
answer
1k
views
Using Callable instead of Supplier or vice versa
I came across code that used Callable instead of Supplier. I did not see any threads spawning across to use Callable. But is it okay to use Callable instead of Supplier?.
One of the devs I work with ...
- 2,107
0
votes
2
answers
2k
views
Java 8 Deferring Execution of Method
I have a class hierarchy like this:
public abstract class AbstractFoo {
abstractMethod(/*parameters*/) {
//do something;
}
}
public class Foo extends AbstractFoo {
public String ...
- 6,088
1
vote
0
answers
3k
views
org.awaitility.Awaitility.await() is never triggered
I saw this post on how to use org.awaitility.await()
I have this code:
public void bar() {
await().forever().pollInterval(5, SECONDS).until(foo());
}
private Callable<Boolean> foo() {
...
- 36.6k
5
votes
2
answers
185
views
Make a Method Which Generates the x and y values of Another Given Function
I have just started to learn about Java Runnables and I have heard of Callables. However, I am very much struggling with this problem. I would like to make a method which takes a function as an ...
- 742
1
vote
0
answers
949
views
ExecutorService asynchronous never end the main method
I've to do a massive upload to a certain server - my program do each upload in about 1 second - but i will upload around 10 thousand documents each time.
To do this, i thought in use parallelism to ...
- 1,063
8
votes
1
answer
5k
views
Java 8 Function<String, Void> vs Consumer<String> [duplicate]
I can't for the life of me find an explanation of the following:
public static void takesAFunction(Function<String, Void> func) {
func.apply("Hi I'm running a function");
}
public static ...
- 2,400
11
votes
1
answer
16k
views
Callable<Void> as Functional Interface with lambdas
I am just learning about new java8 features. And here is my question:
Why is it not allowed to use Callable<Void> as a functional interface for lambda expressions? (Compiler complains about ...
- 618