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https://issues.apache.org/jira/browse/IO-706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17275770#comment-17275770
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David Mollitor commented on IO-706:
-----------------------------------

Sorry,... one more "finally" comment:

A {{toString()}} method would be helpful.  I typically use SLF4J and I could 
see a statement like:

{code:java}
LOG.debug("Processed file {} in {}", filePath, timestampedObserver);
{code}

The beauty of it is that it only calls "toString()" if the logger framework is 
configured for 'debug' level logging.

Otherwise folks would be tempted to do:
{code:java}
if (LOG.isDebugEnabled()) {
   LOG.debug("Processed file {} in {}ms", filePath, 
timestampedObserver.getOpenToCloseDuration());
}
{code}

> TimedOutputStream/TimedInputStream 
> -----------------------------------
>
>                 Key: IO-706
>                 URL: https://issues.apache.org/jira/browse/IO-706
>             Project: Commons IO
>          Issue Type: New Feature
>          Components: Streams/Writers
>            Reporter: David Mollitor
>            Priority: Major
>
> Create a {{FilterInputStream}} {{FilterOutputStream}} that records the time 
> it was opened (instantiated) and the time it was closed.  Add method to 
> return the delta so that users can request the amount of time required to 
> read from (or write to) the underlying Stream.



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