
net.openhft.chronicle.hash.impl.ChronicleHashCloseOnExitHook Maven / Gradle / Ivy
/*
* Copyright 2012-2018 Chronicle Map Contributors
*
* Licensed 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.openhft.chronicle.hash.impl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.TreeMap;
import java.util.WeakHashMap;
final class ChronicleHashCloseOnExitHook {
private static final Logger LOG = LoggerFactory.getLogger(ChronicleHashCloseOnExitHook.class);
private static WeakHashMap maps = new WeakHashMap<>();
private static long order = 0;
static {
Runtime.getRuntime().addShutdownHook(new Thread(ChronicleHashCloseOnExitHook::closeAll));
}
private ChronicleHashCloseOnExitHook() {
}
static synchronized void add(VanillaChronicleHash hash) {
if (maps == null)
throw new IllegalStateException("Shutdown in progress");
maps.put(hash.identity, order++);
}
static synchronized void remove(VanillaChronicleHash hash) {
if (maps == null)
return; // we are already in shutdown
maps.remove(hash.identity);
}
private static void closeAll() {
try {
WeakHashMap maps;
synchronized (ChronicleHashCloseOnExitHook.class) {
maps = ChronicleHashCloseOnExitHook.maps;
ChronicleHashCloseOnExitHook.maps = null;
}
TreeMap orderedMaps = new TreeMap<>();
maps.forEach((identity, order) -> orderedMaps.put(order, identity.hash()));
// close later added maps first
orderedMaps.descendingMap().values().forEach(h -> {
try {
Runnable preShutdownAction = h.getPreShutdownAction();
if (preShutdownAction != null) {
try {
preShutdownAction.run();
} catch (Throwable throwable) {
try {
LOG.error("Error running pre-shutdown action for " + h.toIdentityString() +
" :", throwable);
} catch (Throwable t2) {
throwable.addSuppressed(t2);
throwable.printStackTrace();
}
}
}
h.close();
} catch (Throwable throwable) {
try {
LOG.error("Error while closing " + h.toIdentityString() +
" during shutdown hook:", throwable);
} catch (Throwable t2) {
// This may occur if the log service has already been shut down. Try to fall
// back to printStackTrace().
throwable.addSuppressed(t2);
throwable.printStackTrace();
}
}
});
} catch (Throwable throwable) {
try {
LOG.error("Error while closing maps during shutdown hook:", throwable);
} catch (Throwable t2) {
throwable.addSuppressed(t2);
throwable.printStackTrace();
}
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy