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/*
*
* 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.qpid.thread;
import java.lang.Thread.UncaughtExceptionHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* An {@link UncaughtExceptionHandler} that writes the exception to the application log via
* the SLF4J framework. Once registered with {@link Thread#setUncaughtExceptionHandler(UncaughtExceptionHandler)}
* it will be invoked by the JVM when a thread has been <i>abruptly</i> terminated due to an uncaught exception.
* Owing to the contract of {@link Runnable#run()}, the only possible exception types which can cause such a termination
* are instances of {@link RuntimeException} and {@link Error}. These exceptions are catastrophic and the client must
* restart the JVM.
* <p>
* The implementation also invokes {@link ThreadGroup#uncaughtException(Thread, Throwable)}. This
* is done to retain compatibility with any monitoring solutions (for example, log scraping of
* standard error) that existing users of older Qpid client libraries may have in place.
*
*/
public class LoggingUncaughtExceptionHandler implements UncaughtExceptionHandler
{
private static final Logger _logger = LoggerFactory.getLogger(LoggingUncaughtExceptionHandler.class);
@Override
public void uncaughtException(Thread t, Throwable e)
{
try
{
_logger.error("Uncaught exception in thread \"{}\"", t.getName(), e);
}
finally
{
// Invoke the thread group's handler too for compatibility with any
// existing clients who are already scraping stderr for such conditions.
t.getThreadGroup().uncaughtException(t, e);
}
}
}
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