/*
* 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
*
* 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 org.apache.brooklyn.util.javalang;
import org.apache.brooklyn.util.exceptions.Exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Threads {
private static final Logger log = LoggerFactory.getLogger(Threads.class);
public static Thread addShutdownHook(final Runnable task) {
Thread t = new Thread("shutdownHookThread") {
public void run() {
try {
task.run();
} catch (Exception e) {
log.error("Failed to execute shutdownhook", e);
}
}
};
Runtime.getRuntime().addShutdownHook(t);
return t;
}
public static boolean removeShutdownHook(Thread hook) {
try {
return Runtime.getRuntime().removeShutdownHook(hook);
} catch (IllegalStateException e) {
// probably shutdown in progress
String text = Exceptions.collapseText(e);
if (text.contains("Shutdown in progress")) {
if (log.isTraceEnabled()) {
log.trace("Could not remove shutdown hook "+hook+": "+text);
}
} else {
log.warn("Could not remove shutdown hook "+hook+": "+text);
log.debug("Shutdown hook removal details: "+e, e);
}
return false;
}
}
}