Tim Canavan created CONFIGURATION-496:
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Summary: Excessive Synchronization AbstractFileConfiguration
Key: CONFIGURATION-496
URL: https://issues.apache.org/jira/browse/CONFIGURATION-496
Project: Commons Configuration
Issue Type: Bug
Components: File reloading
Affects Versions: 1.8, 1.7, 1.6
Reporter: Tim Canavan
We are having a problem with commons configuration 1.6
AbstractFileConfiguration
During a stress test we are seeing that we have wait locks against this method
causing this method not to complete for up to one second.
We are using the FileReloadStrategy delegate which makes a check on the file
system when now + interval is greater than the compare time.
Why can't we make this check before the synchronized block thus increasing
throughput. I have noticed in 1.8 that the caller to this method is
synchronized. This seems like excessive synchronization. Any ideas how to solve
this.
public void reload()
{
synchronized (reloadLock)
{
if (noReload == 0)
{
try
{
enterNoReload(); // avoid reentrant calls
if (strategy.reloadingRequired())
{
if (getLogger().isInfoEnabled())
{
getLogger().info("Reloading configuration. URL is "
+ getURL());
}
fireEvent(EVENT_RELOAD, null, getURL(), true);
setDetailEvents(false);
boolean autoSaveBak = this.isAutoSave(); // save the
current state
this.setAutoSave(false); // deactivate autoSave to
prevent information loss
try
{
clear();
load();
}
finally
{
this.setAutoSave(autoSaveBak); // set autoSave to
previous value
setDetailEvents(true);
}
fireEvent(EVENT_RELOAD, null, getURL(), false);
// notify the strategy
strategy.reloadingPerformed();
}
}
catch (Exception e)
{
fireError(EVENT_RELOAD, null, null, e);
// todo rollback the changes if the file can't be reloaded
}
finally
{
exitNoReload();
}
}
}
}
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