code: /**
   * Copyright 2018 Alexey Ragozin
   *
   * Licensed 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.gridkit.jvmtool.parser.jstack;
  
  import java.io.StringReader;
  import java.lang.management.ManagementFactory;
  
  import org.gridkit.jvmtool.codec.stacktrace.ThreadSnapshotEvent;
  import org.gridkit.jvmtool.stacktrace.StackFrame;
  import org.gridkit.lab.jvm.attach.AttachManager;
  import org.junit.Test;
  
  public class JStackParserTest {
  
      private int pid() {
          String name = ManagementFactory.getRuntimeMXBean().getName();
          name = name.substring(0, name.indexOf("@"));
          return Integer.parseInt(name);
      }
  
      @Test
      public void test_thread_dump() throws Exception {
          spawnBusyThread("Blocker-1");
          spawnBusyThread("Blocker-2");
          spawnBusyThread("Blocker-3");
          spawnBusyThread("Blocker \"abc\"");
  
          Thread.sleep(500);
  
          String[] args = {};
          StringBuilder sb = new StringBuilder();
          AttachManager.getThreadDump(pid(), args, sb, 30000);
          System.out.println(sb);
  
          StringReader sreader = new StringReader(sb.toString());
          JStackDumpParser parser = new JStackDumpParser(sreader);
  
          System.out.println("----------------------------------");
          System.out.println("Dump parsed: " + parser.isValid());
          System.out.println("JVM: " + parser.getJvmDetails());
          for(String line: parser.getUnparsedContent()) {
              System.out.println("Unparsed: " + line);
          }
          for(ThreadSnapshotEvent tse: parser.getThreads()) {
              print(tse);
          }
      }
  
      private void print(ThreadSnapshotEvent tse) {
          System.out.println();
          System.out.println("Thread: " + tse.threadName());
          System.out.println(tse.tags());
          System.out.println(tse.counters());
          if (tse.stackTrace() != null) {
              for(StackFrame frame: tse.stackTrace()) {
                  System.out.println(" at " + frame);
              }
          }
      }
  
      public synchronized void busyCall() {
          try {
              Thread.sleep(1);
          } catch (InterruptedException e) {
          }
      }
  
      public void spawnBusyThread(String name) {
          Thread t = new Thread(name) {
              @Override
              public void run() {
                  while(true) {
                      busyCall();
                  }
              }
          };
          t.setDaemon(true);
          t.start();
      }
  }
  