[PHP-DEV] try/catch/FINALLY

[Cristiano Duarte]

Please, ignore this:

> IMHO I think that an implementation start would be hooking the function

exit

> at the engine..

And read this instead:
IMHO I think that an implementation start would be hooking the exit of the
try statement even if its normal or has an exception thrown...

Best regards,

Cristiano Duarte

"Cristiano Duarte" <cunha17@uol.com.br> escreveu na mensagem
news:20030806001540.7978.qmail@pb1.pair.com...

> Hi all,
>
> I know there was a lot of discussion about try/catch, but I will bring it

up

> again:
>
> What about finally ?
>
> I know someone posted that finally isn't necessary since PHP destroy all
> variables and releases all resources at the end of the script. But if the
> script is a PHP-GTK application or a standalone server aplication (like
> CORBA)?
>
> Finally is very useful in situations where you must be certain that some
> piece of code will be executed no matter what happens (a normal execution,

a

> return statement or an exception).
>
> IMHO I think that an implementation start would be hooking the function

exit

> at the engine..
>
> Cristiano Duarte
>
>

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[Marcus Börger]

Hello Cristiano,

Wednesday, August 6, 2003, 2:15:39 AM, you wrote:

CD> Hi all,

CD> I know there was a lot of discussion about try/catch, but I will bring it up
CD> again:

CD> What about finally ?

There's absolute no need for finally:

try {
}
catch (...) {
}
// here's you're finally code


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Best regards,
Marcus mailto:helly@php.net


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[Timm Friebe]

On Wed, 2003-08-06 at 09:14, Marcus Börger wrote:

> Hello Cristiano,

[...]

> There's absolute no need for finally:
>
> try {
> }
> catch (...) {
> }
> // here's you're finally code

Well, consider:

function foo() {
try {
// ...
} catch (Exception $e) {
// ...handle it...
return false;
} finally {
// ...clean up...
}

// ...continue doing whatever...
return true;
}

The cleanup code is always to be executed, the method should of course
not continue in case an exception was caught.

OK, I could write:

function foo() {
try {
// ...
} catch (Exception $e) {
// ...handle it...
}

// ...clean up ...
if ($e) return false;

// ...continue doing whatever...
return true;
}

so all it boils down to is, I guess, syntactic sugar.

Evil programming language sourcecode below:)
----------------------------------------------------------------------------
thekid@thekid:~ > cat FinallyTest.java
class FinallyTest {
public static void main(String[] args) {
boolean success= FinallyTest.test(args.length > 0);
System.out.println("Success? " + success);
}

public static boolean test(boolean dothrow) {
try {
if (dothrow) {
throw new Exception("Test");
}
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
System.out.println("<<< In finally >>>");
}
System.out.println("OK");
return true;
}
}
thekid@thekid:~ > CLASSPATH="." java FinallyTest
<<< In finally >>>
OK
Success? true
thekid@thekid:~ > CLASSPATH="." java FinallyTest 1
java.lang.Exception: Test
at FinallyTest.test(FinallyTest.java:10)
at FinallyTest.main(FinallyTest.java:3)
<<< In finally >>>
Success? false

- Timm


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[Wez Furlong]

The most important thing missing from this is that you cannot rethrow the
exception from the point where you suggest to place the finally code :-)

--Wez.

> There's absolute no need for finally:
>
> try {
> }
> catch (...) {
> }
> // here's you're finally code

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[Simeon Koptelov]

Hello Cristiano,

Wednesday, August 6, 2003, 6:15:39 AM, you wrote:

It would be much better if user will have to put method's throws in
method's declaration imho( see my reply to Marcus ).

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Best regards,
Simeon mailto:xi@newmail.ru


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[Jeff Moore]

On Wednesday, August 6, 2003, at 03:14 AM, Marcus B=F6rger wrote:

> There's absolute no need for finally:

PHP doesn't necessarily control every resources you might want to=20
deallocate.

mysql_query('LOCK ...');
try {
... do stuff
} finally {
mysql_query('UNLOCK...');
}
... do more stuff=


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