| /* |
| * 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 com.alibaba.dubbo.common.utils; |
| |
| import java.io.OutputStream; |
| 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; |
| |
| public class JVMUtil { |
| public static void jstack(OutputStream stream) throws Exception { |
| ThreadMXBean threadMxBean = ManagementFactory.getThreadMXBean(); |
| for (ThreadInfo threadInfo : threadMxBean.dumpAllThreads(true, true)) { |
| stream.write(getThreadDumpString(threadInfo).getBytes()); |
| } |
| } |
| |
| private static String getThreadDumpString(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(); |
| MonitorInfo[] lockedMonitors = threadInfo.getLockedMonitors(); |
| for (; i < stackTrace.length && i < 32; 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 : lockedMonitors) { |
| 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(); |
| } |
| } |