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Date: Mon, 24 Nov 2025 22:48:51 +0000
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Subject: Re: [PHP-DEV] [VOTE] True Async RFC 1.6
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From: imsop.php@rwec.co.uk ("Rowan Tommins [IMSoP]")

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On 24/11/2025 16:57, Edmond Dantes wrote:
>> An error will occur for whom? SDK Susie when unit testing her library?
> If SDK Susie used a new coroutine in which she calls the
> `LoggerInterface::flush()` method, then with some probability the user
> may notice that log entries are sometimes duplicated because the
> `LoggerInterface::logs` property is not being cleared.
> You could say that SDK Susie is responsible for this, because she ran
> code that was never intended to be executed in a concurrent
> environment.


Just to be clear, LoggerInterface is not an imaginary example, it's 
right here: https://www.php-fig.org/psr/psr-3/#3-psrlogloggerinterface

Packagist lists 9539 packages which depend on it, and has logged more 
than 1 billion installs: https://packagist.org/packages/psr/log

It is an absolute certainty that a PHP library will want to both use 
async I/O and accept a LoggerInterface as a dependency.


>> If it is an error for SDK Susie, what is her solution to allow users to pass in a logger to her library?
> To avoid the error, SDK Susie must be sure that the
> **LoggerInterface** implementation supports concurrent execution.


Susie doesn't know anything about the implementation, other than what is 
defined in the interface. That is literally the purpose of accepting an 
interface.

So it sounds like her only safe option is to restrict her usage of async 
coroutines to small self-contained pieces of code, and only use injected 
dependencies and callbacks in the "main" coroutine where they were 
passed in.


Regards,

-- 
Rowan Tommins
[IMSoP]

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    <div class="moz-cite-prefix">On 24/11/2025 16:57, Edmond Dantes
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAMW7n8Cfs9+wEpGVp5C2VL3ey8vKUNS2NyJAq+w7-DJXg172Dw@mail.gmail.com">
      <blockquote type="cite">
        <pre wrap="" class="moz-quote-pre">An error will occur for whom? SDK Susie when unit testing her library?
</pre>
      </blockquote>
      <pre wrap="" class="moz-quote-pre">If SDK Susie used a new coroutine in which she calls the
`LoggerInterface::flush()` method, then with some probability the user
may notice that log entries are sometimes duplicated because the
`LoggerInterface::logs` property is not being cleared.
You could say that SDK Susie is responsible for this, because she ran
code that was never intended to be executed in a concurrent
environment.</pre>
    </blockquote>
    <p><br>
    </p>
    <p>Just to be clear, LoggerInterface is not an imaginary example,
      it's right here:
      <a class="moz-txt-link-freetext" href="https://www.php-fig.org/psr/psr-3/#3-psrlogloggerinterface">https://www.php-fig.org/psr/psr-3/#3-psrlogloggerinterface</a></p>
    <p>Packagist lists 9539 packages which depend on it, and has logged
      more than 1 billion installs:
      <a class="moz-txt-link-freetext" href="https://packagist.org/packages/psr/log">https://packagist.org/packages/psr/log</a></p>
    <p>It is an absolute certainty that a PHP library will want to both
      use async I/O and accept a LoggerInterface as a dependency.</p>
    <p><br>
    </p>
    <p><span style="white-space: pre-wrap">
</span><span style="white-space: pre-wrap">
</span></p>
    <blockquote type="cite"
cite="mid:CAMW7n8Cfs9+wEpGVp5C2VL3ey8vKUNS2NyJAq+w7-DJXg172Dw@mail.gmail.com">
      <blockquote type="cite">
        <pre wrap="" class="moz-quote-pre">If it is an error for SDK Susie, what is her solution to allow users to pass in a logger to her library?
</pre>
      </blockquote>
      <pre wrap="" class="moz-quote-pre">To avoid the error, SDK Susie must be sure that the
**LoggerInterface** implementation supports concurrent execution.</pre>
    </blockquote>
    <p><br>
    </p>
    <p>Susie doesn't know anything about the implementation, other than
      what is defined in the interface. That is literally the purpose of
      accepting an interface.</p>
    <p>So it sounds like her only safe option is to restrict her usage
      of async coroutines to small self-contained pieces of code, and
      only use injected dependencies and callbacks in the "main"
      coroutine where they were passed in.</p>
    <p><br>
    </p>
    <p>Regards,</p>
    <pre class="moz-signature" cols="72">-- 
Rowan Tommins
[IMSoP]</pre>
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