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Questions tagged [callable]

A task that returns a result and may throw an exception.

The Callable interface is similar to Runnable, in that both are designed for classes whose instances are potentially executed by another thread. A Runnable, however, does not return a result and cannot throw a checked exception.

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Dynamically assigning function implementation in Python

I want to assign a function implementation dynamically. Let's start with the following: class Doer(object): def __init__(self): self.name = "Bob" def doSomething(self): print "%s got it done" % self.name def…
Yarin
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RestTemplate should be static globally declared?

I am using Java Callable Future in my code. Below is my main code which uses the future and callables - public class TimeoutThread { public static void main(String[] args) throws Exception { ExecutorService executor =…
AKIWEB
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making a class callable in same instance

class Foo(object): def tick(self): print("something") class Bar(object): def __init__(self): self.foo = Foo() def tick(self): #Here's what I do.... self.foo.tick() #here's what my goal would be …
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What does the keyword "callable" do in PHP

To be more exact, the "callable" used in function declaration arguments. like the one below. function post($pattern, callable $handler) { $this->routes['post'][$pattern] = $handler; return $this; } How does it benefit us? why and how do we…
S. Goody
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What is the difference between a function object and a callable object?

I recently saw the presentation about the changes in ECMAScript 5. And there was a slide with this statement: Function vs Callable typeof f === 'function' // → f is Callable ({}).toString.call(f) === '[object Function]' // → f…
Gumbo
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Java: Parameterized Runnable

Standard Runnable interface has only non-parametrized run() method. There is also Callable interface with call() method returning result of generic type. I need to pass generic parameter, something like this: interface MyRunnable { public…
mschayna
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timeit ValueError: stmt is neither a string nor callable

I played with timeit in Python, got a weird problem. I define a simple function add. timeit works when I pass add two string parameters. But it raises ValueError: stmt is neither a string nor callable when I pass add two int parameters. >>>…
liang li
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executing a method in parallel from a call method

I have a library which is being used by customer and they are passing DataRequest object which has userid, timeout and some other fields in it. Now I use this DataRequest object to make a URL and then I make an HTTP call using RestTemplate and my…
john
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Understanding Java FixedThreadPool

I am trying to understand how Java FixedThreadPool works in practice, but the docs do not answer my question. Assume a simple scenario like: ExecutorService ES= Executors.newFixedThreadPool(3); List FL; for(int i=1;i<=200;i++){ …
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How to code/reference to a PHP callable functions easy to manage for my IDE

When I have to write a reference to a callable function I use the standard syntax of PHP defined as: A PHP function is passed by its name as a string. Any built-in or user-defined function can be used [... omitted...]. A method of an instantiated…
Ivan Buttinoni
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Python 3: Making a str object callable

I have a Python program that takes user input. I store user input a string variable called "userInput". I want to be able to call the string the user entered... userInput = input("Enter a command: ") userInput() From this, I get the error:…
just_a_programmer
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How to declare Callable to execute function returning void in Java?

Suppose I would like to run static method foo asynchronously void foo() throws Exception {...} Since foo throws an exception I would prefer create a Callable and invoke ExecutorService.submit with it to get a Future. Now I wonder how to declare…
Michael
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How can I wrap a method so that I can kill its execution if it exceeds a specified timeout?

I have a method that I would like to call. However, I'm looking for a clean, simple way to kill it or force it to return if it is taking too long to execute. I'm using Java. to illustrate: logger.info("sequentially executing all batches..."); for…
carrier
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Is a generator the callable? Which is the generator?

A generator is simply a function which returns an object on which you can call next, such that for every call it returns some value, until it raises a StopIteration exception, signaling that all values have been generated. Such an object is called…
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What is the implementation of call() in dart?

I somehow found the call() method is on every function. Using this method I could change my if (callback != null) callback() to callback?.call(). So I tried to find the implementation and document of call(), but I couldn't. Is it just built-in…
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