[jira] [Commented] (CONFIGURATION-425) FileChangedReloadingStrategy works differently on Unix and Windows

["Oliver Heger (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CONFIGURATION-425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426054#comment-13426054 ] 

Oliver Heger commented on CONFIGURATION-425:
--------------------------------------------

Any news here?
                
> FileChangedReloadingStrategy works differently on Unix and Windows
> ------------------------------------------------------------------
>
>                 Key: CONFIGURATION-425
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-425
>             Project: Commons Configuration
>          Issue Type: Bug
>          Components: File reloading
>    Affects Versions: 1.6
>         Environment: Windows 7 x64 and Ubuntu 10.04 Server
>            Reporter: Dan Haynes
>            Priority: Minor
>             Fix For: 2.0
>
>
> I created a unit test for a configuration class that uses commons configuration. It loads both a set of static properties and a set of dynamic properties, the latter uses FilechangeReloadingStragegy. The unit test copies a file containing an initial set of of dynamic properties (using commons-io FileUtils.copy()) , verifies the values are as expected and then copies an updated set of properties, sleeps longer than the refresh delay and then verifies the new values are in place. 
> On WIndows it works as expected. It recognizes that FileUtils.copy() has replaced the dynamic.properties file with an updated version and it loads the new property values. 
> On Linux, nothing I do makes it recognize that the file has been replaced except by actually opening a shell and editing the dynamic.properties values. Then it works as expected.
> This may well be my lack of understanding of some Unix filesystem behavior but it seems like FilechangeReloadingStrategy should notice the change to the file one way or the other.
> The unit test looks like so:
> {code}
> 		final ConfigurationManager cm = new StandardConfigurationManager(staticTestPropertiesFileName, dynamicTestPropertiesFileName);
> 		/*
> 		 * Initialize the configuration manager. This should read all the initial values.
> 		 */
> 		cm.init();
> 		Assert.assertEquals(System.getProperty("java.user"), cm.retrieveUserName());
> 		/*
> 		 * Verify that the static properties were read.
> 		 */
> 		Assert.assertEquals("1.00", cm.retrieveVersionId());
> 		/*
> 		 * Verify that the initial values for the dynamic properties were read.
> 		 */
> 		Assert.assertEquals(100, cm.retrieveMaxConcurrentLogons());
> 		if (copyFile(updatedConfigFileName, dynamicTestPropertiesFileName))
> 		{
> 			/*
> 			 * The default update window for Apache commons configuration file reload strategy is 5 seconds
> 			 * so wait more than 5 seconds to ensure the new value will be read.
> 			 */			
> 			log.info("Sleeping until configuration refresh delay has passed");
> 			sleep(6000L);
> 			log.info("Woke, resuming test, maxConcurrentLogons = " + cm.retrieveMaxConcurrentLogons());
> 				
> 			/*
> 			 * Verify that the property was updated to the expected new value.
> 			 */
> >>> this fails every time on Linux:	Assert.assertEquals(1, cm.retrieveMaxConcurrentLogons());
> 		}
> 		else
> 		{
> 			Assert.fail("Couldn't copy updated test properties file");
> 		}
> {code}
> I've tried everything I could think of to trigger the reload strategy. After calling FileUtils.copy() on the file I added a FileUtils.touch() on the destination file. That didn't work so I added a "Process process = runtime.exec("touch " + destFile.getAbsolutePath());" to be absolutely 100% certain the file timestamp is being updated. It gets updated, but the reloading strategy never recognizes it. 
> I googled and searched the JIRA incidents and the only thing I can find that looks similar are some references to a problem in V1.1 that was fixed long ago.

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