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Questions tagged [dispatch]

Dynamic dispatch (also known as dynamic binding) is the process of mapping a message to a specific sequence of code (method) at runtime. This is done to support the cases where the appropriate method cannot be determined at compile-time (i.e. statically).

Dynamic dispatch is only used for code invocation and not for other binding processes (such as for global variables) and the name is normally only used to describe a language feature where a runtime decision is required to determine which code to invoke.

This Object-Oriented feature allows substituting a particular implementation using the same interface, and therefore it enables polymorphism.

http://en.wikipedia.org/wiki/Dynamic_dispatch

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Working With Async Firebase Calls SwiftUI

I understand that the Firebase getDocument call is Async, so I'm trying to figure out how to essentially wait until the call finishes executing, and then move on to doing other stuff. I have tried making use of DispatchGroup() and entering/leaving…
Evan
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From sub class to super class and back again

So imagine this, Given a class hierarchy: S (abstract) A extends S B extends S Let's say we have a chain of connected components handling objects of types of A and B. For example: K1.handle(A) -> K2.handle(A) -> K3.handle(A) meaning that K1 takes…
Raipe
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How to do not dispatch so often?

I'v read a lot how dispatch work. But i Still a little confusing about it. For example, what if I have class ViewController: UIViewController { @IBAction func actionDoStuff(_ sender: UIButton) { DispatchQueue.global(qos:…
Grigory
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How to fix dispatch function calling twice each time after clicking button in React?

I have been working on a simple program where I have an array of posts and want to update the individual values of each post object. For this case, I want to update the number of 'likes' a post has when I click on the like button. Here is the code I…
husseinfawazbc
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TypeError: dispatch is not a function in ReactJS

I am new to React and was trying to build an app that shows the contacts that you input. While everything seems to be fine, the browser is throwing me this error every time I try to add a new contact. Here is my Contacts.js import React, {…
Aniruddha
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How to configure "JWKS_URL" in .env file of Dispatch?

I was checking the .env example that is mentioned in the documentation, but I don't have a clue of what to put in JWKS_URL=. What am I supposed to put there?
Anthony Luzquiños
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Example of custom event dispatching in Android?

I have a scenario below, and was wondering if anyone had a good solution. Basically, I have a class which manages a custom ViewFlipper object. One of these views within the ViewFlipper instance consists of a custom ScrollView with custom rows (which…
dak
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Django Rest Framework: Return response from mixin's dispatch method

In order to interact with slack, a server needs to be able to validate requests based on some cryptographic hashing. If this check returns false, the server should respond with a 400. It seems sensible to do this as a mixin: class…
alex_halford
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Invoking parent functors in Julia

Since version 1.3 Julia allows functor dispatch on abstract types. Therefore, I was wondering whether it is possible to explicitly invoke the parent functor from a child object. E.g. in the example below, is there any way to call (x::Foo)() through…
lassepe
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How to send multiple responses from one request in Flask?

I'm prototyping a service with Flask that will receive one POST request that may match multiple destinations, each of which will generate a response to send back to the sender. These responses shall not be grouped together into one response. Flask,…
patrick
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Events are dispatched after event loop queue?

As i understand, when i click the left mouse button, event 'mousedown' is pushed into the event loop queue. This event has recorded coordinates at the moment of click. Every 'mousedown' event has an event target that is the deepest nested element…
flasher1101
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BotBuilder - NLP with dispatch error No such host is known

I am new in using Bot Builder Framework. I was following this tutorial from Microsoft https://learn.microsoft.com/en-us/azure/cognitive-services/qnamaker/tutorials/integrate-qnamaker-luis. I am using the code from GitHub(NLP-with-dispatch) and set…
ggfieder
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what should I do to load asynchronous images in tableView?

well, I should load images in the table view, I downloaded and loaded successful, but when I try to show in the table view, they doesn't appear, but, if I do scroll in the table view, the images will appear but the image won't in the middle of the…
Andres Gomez
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Async/Await function is never resolved with Dispatch

In my function below, addToFlatList is only called once, even though I know there are several items in my database to be added. Seems like the fist addToFlatList is never resolved? What am I doing wrong? photosSnapshot.forEach(async…
JAM
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C++ static dispatch with custom initialization

I would like to use CRTP for a performance-sensitive section of my code. However, my base class has a bitset, which size depends on the derived class. I was hoping that something like that would work: template class Base…
Touloudou
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