Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:88965
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 209.85.217.169 as permitted sender)
Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes
To: internals@lists.php.net, "Erik van Velzen" <erik@evanv.nl>
References: <CAFEDrMNQ2gUYV-335NwW8WoYqOkJBPg3ZH+7vnHEk8w_+fFmrQ@mail.gmail.com> <CAPwsocFpzysgNFF0dPB3J0qD6Ltmcz5yvgcF0AGgAMGQt6jYjQ@mail.gmail.com> <CAFEDrMPaTP1f8_-ufodPj-5q7rCNeVG5ZJ_HPHsC-CDywyZkQg@mail.gmail.com>
Date: Wed, 28 Oct 2015 17:34:28 +0300
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Message-ID: <op.x67z3ql6c9evq2@nikita-300e4c-300e5c-300e7c>
In-Reply-To: <CAFEDrMPaTP1f8_-ufodPj-5q7rCNeVG5ZJ_HPHsC-CDywyZkQg@mail.gmail.com>
User-Agent: Opera Mail/12.16 (Linux)
Subject: Re: [PHP-DEV] In a destructor, how to detect if an exception is
 currently in flight?
From: inefedor@gmail.com ("Nikita Nefedov")

Hi Erik,

On Wed, 28 Oct 2015 16:28:59 +0300, Erik van Velzen <erik@evanv.nl> wrote:

> Thanks for your input.
>
> I did not try-catch because it doesn't really work, you either
> duplicate rollback code or get excessive nesting. Real code will
> obviously be more complicated than the examples.
> Also in both cases the handlers are many lines apart from the actual
> transaction call.
>
> Duplicate rollback code:
>
>     try {
>         transactionOne();
>     }
>     catch (\Throwable $e) {
>        rollbackTransactionOne();
>        throw $e;
>     }
>
>     try {
>         transactionTwo();
>     }
>     catch (\Throwable $e) {
>         rollbackTransactionOne();
>         rollbackTransactionTwo();
>         throw $e;
>     }
>     finally {
>         cleanupTransactionTwo();
>     }
>
>     try {
>        transactionThree();
>     }
>     catch (\Throwable $e) {
>         rollbackTransactionOne();
>         rollbackTransactionTwo();
>         rollbackTransactionThree();
>         throw $e;
>     }
>
>     logTransactionOne();
>     logTransactionTwo();
>     logTransactionThree();

In C goto is usually used for this kind of problem, this is how it's  
usually done:

https://gist.github.com/nikita2206/dc48c9f14db61420751e

here's a first article I could find about it  
http://eli.thegreenplace.net/2009/04/27/using-goto-for-error-handling-in-c

What you could also use though is a generator function:

https://gist.github.com/nikita2206/64959e63ebb49d6ce0c8