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FELIX-6515: Add global write lock to write back cfg files #233

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FELIX-6515: Add global write lock to write back cfg files #233

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21 changes: 16 additions & 5 deletions fileinstall/src/main/java/org/apache/felix/fileinstall/internal/ConfigInstaller.java
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Original file line number Diff line number Diff line change
Expand Up @@ -282,13 +282,24 @@ public void doConfigurationEvent(ConfigurationEvent configurationEvent)
{
props.remove(key);
}
try (Writer fw = new OutputStreamWriter(new FileOutputStream(file), encoding()))

// re-writing a config file must be guarded by a write lock as otherwise DirectoryWatcher
// might pick up an empty file and as a result, write this file to disk in a follow-up event
fileInstall.lock.writeLock().lockInterruptibly();
try
{
try (Writer fw = new OutputStreamWriter(new FileOutputStream(file), encoding()))
{
props.save( fw );
}
// we're just writing out what's already loaded into ConfigAdmin, so
// update file checksum since lastModified gets updated when writing
fileInstall.updateChecksum(file);
}
finally
{
props.save( fw );
fileInstall.lock.writeLock().unlock();
}
// we're just writing out what's already loaded into ConfigAdmin, so
// update file checksum since lastModified gets updated when writing
fileInstall.updateChecksum(file);
}
}
catch (Exception e)
Expand Down