/*
* 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.sling.commons.threaddump.internal;
import java.lang.Thread.UncaughtExceptionHandler;
import java.util.Dictionary;
import java.util.Hashtable;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceFactory;
import org.osgi.framework.ServiceRegistration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Activator implements BundleActivator, UncaughtExceptionHandler {
private static final String LOG_NAME = "org.apache.sling.commons.threaddump.internal.UncaughtExceptionHandler";
/** default log */
private final Logger log = LoggerFactory.getLogger(LOG_NAME);
private UncaughtExceptionHandler oldHandler;
public void start(BundleContext bundleContext) {
// install handler for uncaught exceptions
oldHandler = Thread.getDefaultUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(this);
// install thread handler shell command
register(bundleContext,
new String[] { "org.apache.felix.shell.Command" },
new ServiceFactory() {
public void ungetService(final Bundle bundle,
final ServiceRegistration reg,
final Object consoleObject) {
// nothing to do
}
public Object getService(final Bundle bundle,
final ServiceRegistration reg) {
return new ThreadDumpCommand();
}
}, null);
// install Web Console configuration printer
final Dictionary<String, Object> props = new Hashtable<String, Object>();
props.put("felix.webconsole.label", "slingthreads");
props.put("felix.webconsole.title", "Threads");
props.put("felix.webconsole.configprinter.modes", "always");
final ThreadDumperPanel tdp = new ThreadDumperPanel();
register(bundleContext, new String[] {
tdp.getClass().getName() }, tdp, props);
}
public void stop(BundleContext bundleContext) {
Thread.setDefaultUncaughtExceptionHandler(oldHandler);
}
private void register(final BundleContext context,
final String[] serviceNames,
final Object service,
final Dictionary<String, Object> properties) {
final Dictionary<String, Object> props =
(properties == null ? new Hashtable<String, Object>() : properties);
// default settings
props.put(Constants.SERVICE_DESCRIPTION, "Thread Dumper ("
+ serviceNames[0] + ")");
props.put(Constants.SERVICE_VENDOR, "Apache Software Foundation");
context.registerService(serviceNames, service, props);
}
// ---------- UncaughtExceptionHandler
/**
* Logs the uncaught exception for the thread at level ERROR and chains to
* the old handler, which was installed before this handler has been
* installed.
*
* @param t The <code>Thread</code> which got the exception but did not
* handle it.
* @param e The uncaught <code>Throwable</code> causing the thread to die.
*/
public void uncaughtException(Thread t, Throwable e) {
if (e instanceof ThreadDeath) {
log.error("Thread " + t + " has just been killed", e);
} else {
log.error("Uncaught exception in Thread " + t, e);
}
// chain to original handler
if (oldHandler != null) {
oldHandler.uncaughtException(t, e);
}
}
}