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Re: TeeOutputStream?

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On 06/08/2011 03:31 AM, Henk van Voorthuijsen wrote:
> On Jun 5, 2:17 am, Knute Johnson<nos...@knutejohnson.com>  wrote:
>> I'm working on a project where I need to send the same data to two
>> OutputStreams so I went snooping around on the net for some code to
>> snatch.  Most of the examples I found had what I think is a significant
>> flaw.  That is if for example the write() method looks like this;
>>
>> public void write(byte b) throws IOException {
>>       os1.write(b);
>>       os2.write(b);
>>
>> }
>>
>> if OutputStream os1 throws an IOException, no attempt to write the data
>> to os2 will happen.  This probably isn't too big a concern for writes
>> but what about close()?
>>
>> public void close() throws IOException {
>>       os1.close();
>>       os2.close();
>>
>> }
>>
>> If os1 throws an IOException on the close() method, then os2's close()
>> method will never get executed possibly leaving the stream open and the
>> attached resources still around.  What about;
>>
>> public void close() throws IOException {
>>       try {
>>           os1.close();
>>       } finally {
>>           os2.close();
>>       }
>>
>> }
>>
>> This guarantees that both close() methods will get called.  If both
>> methods throw IOExceptions the caller will never see the first one as it
>> will be hidden.
>>
>> What do you think?  Have I completely over thought this?
>>
>
> You might want to wait for JDK 7's "try with resources" feature. All
> your concerns have been addressed there - im much more detail.
>

Java 7 is a long way off and I'm writing code today.  That said, I do 
like to use the latest stuff.

-- 

Knute Johnson
s/knute/nospam/

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TeeOutputStream? Knute Johnson <nospam@knutejohnson.com> - 2011-06-04 17:17 -0700
  Re: TeeOutputStream? Roedy Green <see_website@mindprod.com.invalid> - 2011-06-04 22:18 -0700
  Re: TeeOutputStream? Stanimir Stamenkov <s7an10@netscape.net> - 2011-06-05 10:44 +0300
  Re: TeeOutputStream? rossum <rossum48@coldmail.com> - 2011-06-05 12:23 +0100
    Re: TeeOutputStream? Stanimir Stamenkov <s7an10@netscape.net> - 2011-06-06 01:23 +0300
      Re: TeeOutputStream? Patricia Shanahan <pats@acm.org> - 2011-06-05 16:55 -0700
        Re: TeeOutputStream? Stanimir Stamenkov <s7an10@netscape.net> - 2011-06-07 00:45 +0300
      Re: TeeOutputStream? rossum <rossum48@coldmail.com> - 2011-06-06 15:16 +0100
  Re: TeeOutputStream? markspace <-@.> - 2011-06-06 14:08 -0700
  Re: TeeOutputStream? Henk van Voorthuijsen <voorth@gmail.com> - 2011-06-08 03:31 -0700
    Re: TeeOutputStream? Knute Johnson <nospam@knutejohnson.com> - 2011-06-08 16:11 -0700

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