/* | |
* 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.karaf.diagnostic.core.providers; | |
import java.io.OutputStreamWriter; | |
import java.lang.management.LockInfo; | |
import java.lang.management.ManagementFactory; | |
import java.lang.management.MonitorInfo; | |
import java.lang.management.ThreadInfo; | |
import java.lang.management.ThreadMXBean; | |
import org.apache.karaf.diagnostic.core.common.TextDumpProvider; | |
/** | |
* Provider which dumps thread info to file named threads.txt. | |
*/ | |
public class ThreadDumpProvider extends TextDumpProvider { | |
/** | |
* Creates new dump entry which contains information about threads. | |
*/ | |
public ThreadDumpProvider() { | |
super("threads.txt"); | |
} | |
@Override | |
protected void writeDump(OutputStreamWriter outputStream) throws Exception { | |
ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean(); | |
outputStream.write("Number of threads: " + threadMXBean.getThreadCount() + "\n"); | |
for (ThreadInfo threadInfo : threadMXBean.getThreadInfo(threadMXBean.getAllThreadIds(), Integer.MAX_VALUE)) { | |
outputStream.write(getDumpThreadString(threadInfo) + "\n\n"); | |
} | |
} | |
protected String getDumpThreadString(ThreadInfo threadInfo) { | |
StringBuilder sb = new StringBuilder("\"" + threadInfo.getThreadName() + "\"" + " Id=" + threadInfo.getThreadId() + " " | |
+ threadInfo.getThreadState()); | |
if (threadInfo.getLockName() != null) { | |
sb.append(" on " + threadInfo.getLockName()); | |
} | |
if (threadInfo.getLockOwnerName() != null) { | |
sb.append(" owned by \"" + threadInfo.getLockOwnerName() + "\" Id=" + threadInfo.getLockOwnerId()); | |
} | |
if (threadInfo.isSuspended()) { | |
sb.append(" (suspended)"); | |
} | |
if (threadInfo.isInNative()) { | |
sb.append(" (in native)"); | |
} | |
sb.append('\n'); | |
int i = 0; | |
StackTraceElement[] stackTrace = threadInfo.getStackTrace(); | |
for (; i < stackTrace.length; i++) { | |
StackTraceElement ste = stackTrace[i]; | |
sb.append("\tat " + ste.toString()); | |
sb.append('\n'); | |
if (i == 0 && threadInfo.getLockInfo() != null) { | |
Thread.State ts = threadInfo.getThreadState(); | |
switch (ts) { | |
case BLOCKED: | |
sb.append("\t- blocked on " + threadInfo.getLockInfo()); | |
sb.append('\n'); | |
break; | |
case WAITING: | |
sb.append("\t- waiting on " + threadInfo.getLockInfo()); | |
sb.append('\n'); | |
break; | |
case TIMED_WAITING: | |
sb.append("\t- waiting on " + threadInfo.getLockInfo()); | |
sb.append('\n'); | |
break; | |
default: | |
} | |
} | |
for (MonitorInfo mi : threadInfo.getLockedMonitors()) { | |
if (mi.getLockedStackDepth() == i) { | |
sb.append("\t- locked " + mi); | |
sb.append('\n'); | |
} | |
} | |
} | |
if (i < stackTrace.length) { | |
sb.append("\t..."); | |
sb.append('\n'); | |
} | |
LockInfo[] locks = threadInfo.getLockedSynchronizers(); | |
if (locks.length > 0) { | |
sb.append("\n\tNumber of locked synchronizers = " + locks.length); | |
sb.append('\n'); | |
for (LockInfo li : locks) { | |
sb.append("\t- " + li); | |
sb.append('\n'); | |
} | |
} | |
sb.append('\n'); | |
return sb.toString(); | |
} | |
} |