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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
package com.sun.star.lib.util;
import java.util.LinkedList;
/**
Helper class to asynchronously execute finalize methods.
Current JVMs seem not to be robust against long-running finalize methods, in
that such long-running finalize methods may lead to OutOfMemoryErrors. This
class mitigates the problem by asynchronously shifting the bodies of
potentially long-running finalize methods into an extra thread. Classes that
make use of this in their finalize methods are the proxies used in the
intra-process JNI UNO bridge and the inter-process Java URP UNO bridge (where
in both cases finalizers lead to synchronous UNO release calls).
If JVMs are getting more mature and should no longer have problems with
long-running finalize mehtods, this class could be removed again.
*/
public final class AsynchronousFinalizer {
/**
Add a job to be executed asynchronously.
The run method of the given job is called exactly once. If it terminates
abnormally by throwing any Throwable, that is ignored.
@param job represents the body of some finalize method; must not be null.
*/
public static void add(Job job) {
synchronized (queue) {
boolean first = queue.isEmpty();
queue.add(job);
if (first) {
queue.notify();
}
}
}
/**
An interface to represent bodies of finalize methods.
Similar to Runnable, except that the run method may throw any Throwable
(which is effectively ignored by AsynchronousFinalizer.add, similar to
any Throwables raised by finalize being ignored).
*/
public interface Job {
void run() throws Throwable;
}
private static final LinkedList queue = new LinkedList();
static {
Thread t = new Thread() {
public void run() {
for (;;) {
Job j;
synchronized (queue) {
while (queue.isEmpty()) {
try {
queue.wait();
} catch (InterruptedException e) {}
}
j = (Job) queue.remove(0);
}
try {
j.run();
} catch (Throwable e) {}
}
}
};
t.setDaemon(true);
t.start();
}
private AsynchronousFinalizer() {}
}
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