FileChangedReloadingStrategy works differently on Unix and Windows
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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
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:
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");
}
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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