message-passing – Tarik Billa

Passing message from background.js to popup.js

August 31, 2023 by Tarik

Popup doesn’t have tab id so you will get the error. You can use chrome.runtime.sendMessage and chrome.runtime.onMessage.addListener in that case. So in background.js chrome.runtime.sendMessage({ msg: “something_completed”, data: { subject: “Loading”, content: “Just completed!” } }); And in popup.js chrome.runtime.onMessage.addListener( function(request, sender, sendResponse) { if (request.msg === “something_completed”) { // To do something console.log(request.data.subject) console.log(request.data.content) } … Read more

What is the difference between message-passing and method-invocation?

August 17, 2023 by Tarik

Using Objective-C as an example of messages and Java for methods, the major difference is that when you pass messages, the Object decides how it wants to handle that message (usually results in an instance method in the Object being called). In Java however, method invocation is a more static thing, because you must have … Read more

What’s the difference between the message passing and shared memory concurrency models?

April 3, 2023 by Tarik

It’s a pretty simple difference. In a shared memory model, multiple workers all operate on the same data. This opens up a lot of the concurrency issues that are common in parallel programming. Message passing systems make workers communicate through a messaging system. Messages keep everyone seperated, so that workers cannot modify each other’s data. … Read more

How to send and receive broadcast message

March 30, 2023 by Tarik

I was having the same problem as you, but I figured out: Remove the intent filter from the manifest and change Intent intent=new Intent(getApplicationContext(),WebResults.class); for Intent intent=new Intent(); Hope it helps!

TPL Dataflow, whats the functional difference between Post() and SendAsync()?

March 24, 2023 by Tarik

To see the difference, you need a situation where blocks will postpone their messages. In this case, Post will return false immediately, whereas SendAsync will return a Task that will be completed when the block decides what to do with the message. The Task will have a true result if the message is accepted, and … Read more

Communication between Activity and Service

March 11, 2023 by Tarik

I have implemented communication between Activity and Service using Bind and Callbacks interface. For sending data to the service I used Binder which retruns the Service instace to the Activity, and then the Activity can access public methods in the Service. To send data back to the Activity from the Service, I used Callbacks interface … Read more

The actor model: Why is Erlang/OTP special? Could you use another language?

February 8, 2023 by Tarik

The C++ code does not deal with fairness, isolation, fault detection or distribution which are all things which Erlang brings as part of its actor model. No actor is allowed to starve any other actor (fairness) If one actor crashes, it should only affect that actor (isolation) If one actor crashes, other actors should be … Read more

How does Actors work compared to threads?

January 20, 2023 by Tarik

The actor model operates on message passing. Individual processes (actors) are allowed to send messages asynchronously to each other. What distinguishes this from what we normally think of as the threading model, is that there is (in theory at least) no shared state. And if one believes (justifiably, I think) that shared state is the … Read more

Cancel an already executing task with Celery?

December 21, 2022 by Tarik

revoke cancels the task execution. If a task is revoked, the workers ignore the task and do not execute it. If you don’t use persistent revokes your task can be executed after worker’s restart. https://docs.celeryq.dev/en/stable/userguide/workers.html#worker-persistent-revokes revoke has an terminate option which is False by default. If you need to kill the executing task you need … Read more