> On May 4, 2017, at 11:32 AM, Mandy Chung <mandy.ch...@oracle.com> wrote: > > >> On May 3, 2017, at 11:16 PM, Peter Levart <peter.lev...@gmail.com> wrote: >> >> Hi Rick, >> >> Allow me to join the discussion... >> >> On 05/04/2017 04:21 AM, Rick Hillegas wrote: >>> Thanks, Roger. That is a helpful example. >>> >>> Derby is a component which can be quiesced and unloaded on >>> resource-constrained platforms, then re-loaded when resources free up. >>> Unloading means garbage collecting all the classloaders created by the >>> component so that, at the end, not a single scrap of Derby code remains >>> loaded. Has the Cleaner pattern been tested under these kinds of >>> conditions? Can you point me at a Cleaner-based library which successfully >>> unloads and reloads itself without leaking classloaders? >> >> Can you point me to a place in Derby code where you are currently using >> finalize() method for your purpose and I'll try to show you how to convert >> this to Cleaner API... >> >> I'm surprised that you actually need finalize() in Derby. Isn't this pure >> Java code? Usually finalize() is needed in situations where there's some >> non-Java resource which has to be cleaned-up when all the references to some >> Java object that represents it are gone. I'm curious what you need to clean >> in a pure Java library. > > Please include me for the pointer to Derby code too. This can be used > serving as examples to migrate away from use of finalizers. We also hope to > do that in JDK to set up more examples.
Here are a few examples I believe: http://svn.apache.org/repos/asf/db/derby/code/trunk/java/client/org/apache/derby/client/am/ClientConnection.java <http://svn.apache.org/repos/asf/db/derby/code/trunk/java/client/org/apache/derby/client/am/ClientConnection.java> http://svn.apache.org/repos/asf/db/derby/code/trunk/java/client/org/apache/derby/client/ClientPooledConnection.java <http://svn.apache.org/repos/asf/db/derby/code/trunk/java/client/org/apache/derby/client/ClientPooledConnection.java> http://svn.apache.org/repos/asf/db/derby/code/trunk/java/engine/org/apache/derby/impl/jdbc/EmbedPreparedStatement.java <http://svn.apache.org/repos/asf/db/derby/code/trunk/java/engine/org/apache/derby/impl/jdbc/EmbedPreparedStatement.java> > > Mandy <http://oracle.com/us/design/oracle-email-sig-198324.gif> <http://oracle.com/us/design/oracle-email-sig-198324.gif> <http://oracle.com/us/design/oracle-email-sig-198324.gif> <http://oracle.com/us/design/oracle-email-sig-198324.gif>Lance Andersen| Principal Member of Technical Staff | +1.781.442.2037 Oracle Java Engineering 1 Network Drive Burlington, MA 01803 lance.ander...@oracle.com <mailto:lance.ander...@oracle.com>
