content: /*
   * Tencent is pleased to support the open source community by making Angel available.
   *
   * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
   *
   * 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
   *
   * https://opensource.org/licenses/Apache-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.tencent.angel.utils;
  
  import com.tencent.angel.conf.AngelConf;
  import org.apache.hadoop.conf.Configuration;
  import org.slf4j.Logger;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.PrintWriter;
  import java.lang.management.ManagementFactory;
  import java.lang.management.ThreadInfo;
  import java.lang.management.ThreadMXBean;
  import java.lang.reflect.Constructor;
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * General reflection utils
   */
  public class ReflectionUtils {
    private static final Class<?>[] EMPTY_ARRAY = new Class[0];
  
    private static final Map<Class<?>, Constructor<?>> CONSTRUCTOR_CACHE = new ConcurrentHashMap();
  
    private static ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
  
    private static long previousLogTime = 0L;
  
  
    public static void setConf(Object theObject, Configuration conf) {
      if (conf != null) {
        if ((theObject instanceof Configurable)) {
          ((Configurable) theObject).setConf(conf);
        }
        setJobConf(theObject, conf);
      }
    }
  
    private static void setJobConf(Object theObject, Configuration conf) {
      try {
        Class jobConfClass = conf.getClassByName("org.apache.hadoop.mapred.JobConf");
  
        Class jobConfigurableClass = conf.getClassByName("org.apache.hadoop.mapred.JobConfigurable");
  
        if ((jobConfClass.isAssignableFrom(conf.getClass())) && (jobConfigurableClass
          .isAssignableFrom(theObject.getClass()))) {
          Method configureMethod =
            jobConfigurableClass.getMethod("configure", new Class[] {jobConfClass});
  
          configureMethod.invoke(theObject, new Object[] {conf});
        }
      } catch (ClassNotFoundException e) {
      } catch (Exception e) {
        throw new RuntimeException("Error in configuring object", e);
      }
    }
  
    public static <T> T newInstance(Class<T> theClass, Configuration conf) {
      Object result;
      try {
        Constructor meth = CONSTRUCTOR_CACHE.get(theClass);
        if (meth == null) {
          meth = theClass.getDeclaredConstructor(EMPTY_ARRAY);
          meth.setAccessible(true);
          CONSTRUCTOR_CACHE.put(theClass, meth);
        }
        result = meth.newInstance(new Object[0]);
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
      setConf(result, conf);
      return (T) result;
    }
  
    public static void setContentionTracing(boolean val) {
      threadBean.setThreadContentionMonitoringEnabled(val);
    }
  
    private static String getTaskName(long id, String name) {
      if (name == null) {
        return Long.toString(id);
      }
      return id + " (" + name + ")";
    }
  
    public static void printThreadInfo(PrintWriter stream, String title) {
      int STACK_DEPTH = 20;
      boolean contention = threadBean.isThreadContentionMonitoringEnabled();
      long[] threadIds = threadBean.getAllThreadIds();
      stream.println("Process Thread Dump: " + title);
      stream.println(threadIds.length + " active threads");
      for (long tid : threadIds) {
        ThreadInfo info = threadBean.getThreadInfo(tid, 20);
        if (info == null) {
          stream.println("  Inactive");
        } else {
          stream.println("Thread " + getTaskName(info.getThreadId(), info.getThreadName()) + ":");
  
          Thread.State state = info.getThreadState();
          stream.println("  State: " + state);
          stream.println("  Blocked count: " + info.getBlockedCount());
          stream.println("  Waited count: " + info.getWaitedCount());
          if (contention) {
            stream.println("  Blocked time: " + info.getBlockedTime());
            stream.println("  Waited time: " + info.getWaitedTime());
          }
          if (state == Thread.State.WAITING) {
            stream.println("  Waiting on " + info.getLockName());
          } else if (state == Thread.State.BLOCKED) {
            stream.println("  Blocked on " + info.getLockName());
            stream
              .println("  Blocked by " + getTaskName(info.getLockOwnerId(), info.getLockOwnerName()));
          }
  
          stream.println("  Stack:");
          for (StackTraceElement frame : info.getStackTrace())
            stream.println("    " + frame.toString());
        }
      }
      stream.flush();
    }
  
    public static void logThreadInfo(Logger log, String title, long minInterval) {
      boolean dumpStack = false;
      if (log.isInfoEnabled()) {
        synchronized (ReflectionUtils.class) {
          long now = System.currentTimeMillis();
          if (now - previousLogTime >= minInterval * 1000L) {
            previousLogTime = now;
            dumpStack = true;
          }
        }
        if (dumpStack) {
          ByteArrayOutputStream buffer = new ByteArrayOutputStream();
          printThreadInfo(new PrintWriter(buffer), title);
          log.info(buffer.toString());
        }
      }
    }
  
    public static <T> Class<T> getClass(T o) {
      return (Class<T>) o.getClass();
    }
  
    static void clearCache() {
      CONSTRUCTOR_CACHE.clear();
    }
  
    static int getCacheSize() {
      return CONSTRUCTOR_CACHE.size();
    }
  
    public static String getAttr(String item, Object conf) throws Exception {
      Class angelConfClass = AngelConf.class;
      Field field = angelConfClass.getDeclaredField(item);
      Class fieldType = field.getDeclaringClass();
      return (String) field.get(conf);
    }
  }
  