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Window events still alive even it is deleted

By : Erica Lin
Date : August 01 2020, 03:00 PM
Hope this helps I believe you are attaching multiple event listeners. Each time the Page1 component re-renders, it attaches a new set of event listeners without cleaning up the old ones. What causes a re-render? State changes. That's why you are only seeing the issue once you add useState and setState.
You can verify this by checking the logs and noticing this not so helpful error:
code :
  renderChart = () => {
    console.log('render chart');
    const { current } = this.chartRef;
    if (current !== null) {
      this.chartInstance = bb.generate({
        bindto: this.chartRef.current
// Bind to 'this' otherwise 'this' is lost
  setChartRef = (ref) => {
    // Remove listeners
    if (!ref) {
      console.log('no reference');
      this.chartRef.current = null;
    // Add listeners
    else {
      console.log('new reference');
      this.chartRef.current = ref;
  createChart = () => {
    this.chartInstance = bb.generate({
      bindto: this.chartRef.current

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Ghost file remains alive when deleted and recreated

By : Mohammad Motalab
Date : March 29 2020, 07:55 AM
it helps some times This is a known problem/feature in Windows called file tunneling.
Ref: http://support.microsoft.com/kb/172190

HTTP: what are the relations between pipelining, keep-alive and Server Sent Events?

By : siraaji
Date : March 29 2020, 07:55 AM
wish helps you
Yes, FIFO. TCP/IP guarantees delivering data in-order, so responses can't arrive in a different order (if the server/proxy is buggy and sends responses in wrong order then you're totally screwed).

How to use SignalR events to keep connection alive in the right way?

By : KhoiNguyenICT
Date : March 29 2020, 07:55 AM
wish help you to fix your issue 1. After I close server, on web-client the "Reconnect" event occurs and the "Disconnect" event occurs only after. Why?
SignalR cannot tell the difference between closing the server and restarting the server. For this reason, when the server shuts down the client will start to try to reconnect in case the server is actually restarting.
code :
$.connection.hub.disconnected(function() {
    setTimeout(function() {
    }, 5000); // Re-start connection after 5 seconds

Keep alive nsmangedobject even if it has been deleted

By : user2515194
Date : March 29 2020, 07:55 AM
I wish did fix the issue. It sounds like you want to create a new NSManagedObjectContext for this controller. You need to do it somewhere that you have access to to original context or its persistent store coordinator. You can do this in prepareForSegue:sender: if you load the view controller via a storyboard segue.
The controller needs to load its objects from this context. You can't pass it objects you fetched using the original context. Instead, ask each of those original objects for its objectID and use those ids to create new managed objects using the new context. Create all of the new objects immediately and access a persistent property of each (to un-fault the objects). The new controller must keep a strong reference to each of these objects because the context doesn't necessarily retain them.

Will events be acknowledged if the thread is dead (but process is alive)

By : Mingkit
Date : March 29 2020, 07:55 AM
it helps some times Yes, handleGpioPinDigitalStateChangeEvent() should continue to be invoked after the initializing threads terminate.
In fact, you shouldn't need to start a new thread to add a listener. Just add the listener directly to your button. An additional thread would be useful to do something that might take a long time. But simply registering an event listener can be expected to be fast.
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