onComplete event for async?

[d47081]

I'm trying to execute function by \Amp\async

$future = \Amp\async(
        function(): void
        {
           // some action...
        }
);

but how can I catch completed event for this $future?

like in JS - on complete event or something like that

$future->on('complete', function() {
     // some action for complete event...
});

[Pader]

Just call map

$future->map(function() {
    // do sth when success
});

$future->catch(function($e) {
    // do sth when error
});

$future->finally(function() {
    // do sth when completed
});

[d47081]

Thanks, but I can't see any print yet:

$future = \Amp\async(
    function()
    {
        print 0;
    }
);

$future->map(function() {
    // do sth when success
    print 1;
});

$future->catch(function($e) {
    // do sth when error
    print 2;
});

$future->finally(function() {
    // do sth when completed
    print 3;
});

I just want to make some action (hide loading bar) in main application thread.
Or at least print 1-3 on print 0 completed

[Pader]

You need await() for future, or php-cli will not wait for async.

$future = \Amp\async(
    function()
    {
        print 0;
    }
);

$future->map(function() {
    // do sth when success
    print 1;
});

$future->catch(function($e) {
    // do sth when error
    print 2;
});

$future->finally(function() {
    // do sth when completed
    print 3;
});

$future->await();

[d47081]

But it make the main thread pending for result like sync..

[Niklas Keller]

Your main thread will always have to wait for all async events you want to have processed before the process dies.

[d47081]

My app have build in \Gtk::timeout_add method to listen Amp status updates on frame background, here is an example:

$future = \Amp\async(
    function()
    {
        print 0;
    }
);

\Gtk::timeout_add( // loop with 1 seconds delay
    1000,
    function() use ($future)
    {
        $future->finally(function() {
            print 1;
        });

        # $future->await(); // not wanted here
    }
);

But $future->await(); freezes application because pending for sync response. And I haven't any print without await.

In other words, I need to check status only, without sync/await marker.

[Pader]

@d47081 Why did you do finally after 1 second? finally must be called on $future immediately.

And what is \Gtk::timeout_add, is this timeout depends on php main thread?

If not, you should do like this:

$future = \Amp\async(
    function()
    {
        print 0;
    }
);

$future->finally(function() {
       print 1;
});

\Gtk::timeout_add( // loop with 1 seconds delay
    1000,
    function() use ($future)
    {
        //do something here
    }
);

$future->await();

[d47081]

Thanks but finally solved my task with shared memory and https://www.php.net/manual/en/function.pcntl-fork.php

because no idea what this library do as \Amp\async does not return $future->finally result into the main thread.

[Pader]

You should figure out what is finally, finally is not for result returning, it's for to do something after whatever a Future is success of failed.

It likes:

try {
    // your job in async...
    // means $future->map() here
} catch (\Throwable $e) {
    // means $future->catch() here
} finally {
    // means $future->finally() here
}