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From "Jochen Wiedmann (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IO-470) Using WatchService in Tailer instead of polling
Date Thu, 05 Mar 2015 19:15:38 GMT

    [ https://issues.apache.org/jira/browse/IO-470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14349305#comment-14349305
] 

Jochen Wiedmann commented on IO-470:
------------------------------------

In Apache XmlRpc, we had several situations, that we did resolve like the following:

    public class Tailer implements ITailer {
         private final ITailer tailer = newTailer();

         private static final ITailer newTailer() {
              try {
                   return new Jdk7Tailer(); // Works, if running under Java 7
              } catch (Throwable t) {
                   return new Jdk6Tailer();
             }
         }  

         @Override
         public void someITailerMethod() {
              tailer.someITailerMethod();
        }
     };


This works gracefully with Java 6 and Java 7.


> Using WatchService in Tailer instead of polling
> -----------------------------------------------
>
>                 Key: IO-470
>                 URL: https://issues.apache.org/jira/browse/IO-470
>             Project: Commons IO
>          Issue Type: Improvement
>          Components: Utilities
>    Affects Versions: 2.4
>            Reporter: Jeremiah Orr
>              Labels: Java7, Tailer
>             Fix For: 2.5
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> Tailer would benefit from using Java 7's WatchService to detect file changes instead
of polling at a set interval. Tailer could respond quicker to changes, and it would save the
system from constant polling. This of course would mean that commons-io would require Java
7.
> I don't know what the future release plans are for commons-io; if there's an upcoming
version that will require Java 7, I'll happily make this change myself.



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