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Clojure function that waits on the completion of another function before executing


Clojure function that waits on the completion of another function before executing

By : Titus Njenga
Date : November 23 2020, 09:01 AM
I wish this help you Clojure's combination of future, promise, and deliver is well suited to starting a process and have several threads wait for it to finish.
code :
hello.core> (def lock [])
#'hello.core/lock
hello.core> (def wait-for-function-helper             
              (memoize (fn [f args]
                         (let [answer (promise)]
                           (println "waiting for function " f " with args" args)
                           (future (deliver answer (apply f args)))
                           answer))))

#'hello.core/wait-for-function-helper
hello.core> (defn wait-for-function [& args]
              (locking lock
                (apply wait-for-function-helper args)))
#'hello.core/wait-for-function
hello.core> (defn dependent-func [f g & args]
              @(wait-for-function f args)
              (apply g args))
#'hello.core/dependent-func
hello.core> (defn slow-f-1 [x]
              (println "starting slow-f-1")
              (Thread/sleep 10000)
              (println "finishing slow-f-1")
              (dec x))
#'hello.core/slow-f-1
hello.core> (do (future
                  (println "first" (dependent-func slow-f-1 inc 4)))
                (future
                  (println "second" (dependent-func slow-f-1 inc 4))))

waiting for function  
#object[clojure.core$future_call$reify__6736 0x40534083 {:status :pending, :val nil}] with args (4)
#object[hello.core$slow_f_1 0x4f9b3396 hello.core$slow_f_1@4f9b3396]
starting slow-f-1
finishing slow-f-1
second
first
5
5
hello.core> (do (future
                  (println "first" (dependent-func slow-f-1 inc 4)))
                (future
                  (println "second" (dependent-func slow-f-1 inc 4))))

#object[clojure.core$future_call$reify__6736 0x3935ea29 {:status :pending, :val nil}]
first 5
second 5


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wait for functiion to complete and execute a function (page loading) that waits for the prevoius function completion

wait for functiion to complete and execute a function (page loading) that waits for the prevoius function completion


By : Ariel Zilbertzan
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You are using it in your code already. Please check the documentation about the onreadystatechange event.
The onreadystatechange event is triggered every time the readyState changes. The readyState property holds the status of the XMLHttpRequest.
code :
xmlhttp.onreadystatechange = function () {

    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

        $("#loading").append('Loaded. Status is ' + xmlhttp.readyState + '<br />');

    } else {

        $("#loading").append('Working... Status is ' + xmlhttp.readyState + '<br />');
    }
}
Why isn't this clojure function executing?

Why isn't this clojure function executing?


By : John
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The function criticize-code is being invoked. The quasi-quote, `, in the body of the function is a reader macro for syntax-quote, which means the following println form, after its trip through the syntax-quote reader, will be returned as data structure rather than executed. The criticize-code function is semantically equivalent to
code :
(defn criticize-code
  [[critkey code]]
  (list 
    'clojure.core/println 
    (list critkey 'turtle/criticisms) 
    (list 'quote code)))
turtle=> (criticize-code [:good '(+ 1 1)])
(clojure.core/println (:good turtle/criticisms) (quote (+ 1 1)))
turtle=> (eval (criticize-code [:good '(+ 1 1)]))
good code: (+ 1 1)
nil
Clojure watch function executing, but 'map' as part of function not executing

Clojure watch function executing, but 'map' as part of function not executing


By : user2823517
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The map function is lazy so it only does its work if a caller realizes the sequence it produces (which is not the case when a function is invoked as part of a watch because the result is essentially thrown away).
You'll either want to wrap the map call in doall, or use doseq instead (which is more idiomatic for side-effecting code):
code :
(doseq [subscriber (:subscribers new-state)]
  (replace-canvas (:canvas new-state) subscriber))
Why does selenium's move_by_offset function sometime waits before executing (Python/Chrome)

Why does selenium's move_by_offset function sometime waits before executing (Python/Chrome)


By : Andre Alves Bezerra
Date : March 29 2020, 07:55 AM
With these it helps I am using Selenium in Chrome with Python to automate some testing and part of that is moving the mouse, as I am creating a lot of test I run them in parallel on threads. The only piece of code that really gives me problems are the following: , You are doing it wrong commenting out the line:
code :
self.w3c_actions.key_action.pause()
JS: Create function that returns function that, when invoked waits for the specified amount of time before executing

JS: Create function that returns function that, when invoked waits for the specified amount of time before executing


By : Orrosta
Date : March 29 2020, 07:55 AM
wish of those help My objective is to: ,
setTimeout(inputFunc(), waitTime, ...args)
code :
setTimeout(inputFunc, waitTime, ...args)  
setTimeout(() => { 
  // do some cleanup stuff related to delay
  inputFunc();
}, waitTime, ...args);
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