On Thu, Jun 04, 2009 at 05:25:34AM -0700, Reinier Zwitserloot wrote:
> Dominic: That is -extremely- bad and buggy code. NEVER use that, ever.
Tell that to the Cocoon guys... That's where I encountered it.
> The problem is this:
>
> If the try block does NOT throw an exception, but the close method
> DOES, then you should not swallow that exception like closeDontThrow()
> supposedly does. Remember, some outputstreams buffer; odds are that no
> actual I/O takes place until you call the close() method!
>
>
> It's acceptable to swallow *INPUTSTREAM*'s close method's IOException,
> not so much because you can safely ignore that exception, but more
> because it never gets thrown anyway, so its a moot point. Rethrowing
> as a RuntimeException (throw new RuntimeException(e)) is a wiser plan,
> though.
>
> The only 'right' way to do it, without ARM or closures, is:
> try {
> boolean swallowClose = false;
> InputStream stream = getStream();
> try {
> //do stuff here
> } catch ( IOException e ) {
> swallowClose = true;
> throw e;
> } finally {
> try {
> stream.close();
> } catch ( IOException e ) {
> if ( !swallowClose ) throw e;
> }
> }
> } catch ( IOException e ) {
> //THIS is where you should handle I/O issues!
> }
>
> a handful, isn't it? And can you believe some people are against the
> ARM proposal? I say those people clearly hate life and adore
> boilerplate.
>
> with arm, that would become:
>
> try ( InputStream stream = getStream() ) {
> //do stuff here
> } catch ( IOException e ) {
> //Handle Exceptions here
> }
I really, really want project COIN. Making it part of Java 5 would have
been nice. :)
Serisouly, this sort of thing is exactly what pushes me towards scala /
groovy / jruby. The boilerplate involved in something as simple as
writing a file _correctly_ is phenomenal.
FWIW I've been dealing with similar boilerplate issues in Perl. For all
it's status as a good "glue" language, it's annoyingly difficult to work
out what went wrong in a call to system()...
-Dom
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