/**
* 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.geronimo.shell.debug;
import java.io.File;
import java.io.PrintWriter;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import org.apache.felix.gogo.commands.Command;
import org.apache.felix.gogo.commands.Option;
import org.apache.karaf.shell.console.OsgiCommandSupport;
@Command(scope = "debug", name = "find-deadlock", description = "Find deadlocked threads")
public class FindDeadlockCommand extends OsgiCommandSupport {
@Option(name = "-f", aliases = { "--file" }, description = "Write the thread information to the specified file")
String file = null;
protected Object doExecute() throws Exception {
ThreadMXBean mxbean = ManagementFactory.getThreadMXBean();
long[] threadIds = mxbean.findDeadlockedThreads();
if (threadIds == null || threadIds.length == 0) {
System.out.println("No deadlocked threads detected.");
} else {
ThreadInfo[] threads = mxbean.getThreadInfo(threadIds, true, true);
File dumpFile = null;
PrintWriter writer = null;
if (file != null) {
dumpFile = new File(file);
writer = new PrintWriter(dumpFile, "UTF-8");
} else {
writer = new PrintWriter(System.out);
}
writer.println("Deadlocked threads found:");
writer.println();
for (ThreadInfo thread : threads) {
Utils.writeThreadInfo(thread, writer);
}
if (file != null) {
System.out.println("Thread deadlock information written to " + dumpFile);
writer.close();
} else {
writer.flush();
}
}
return null;
}
}