content: /*
   *   MIT License
   *
   *   Copyright (c) 2016 Alibaba Group
   *
   *   Permission is hereby granted, free of charge, to any person obtaining a copy
   *   of this software and associated documentation files (the "Software"), to deal
   *   in the Software without restriction, including without limitation the rights
   *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   *   copies of the Software, and to permit persons to whom the Software is
   *   furnished to do so, subject to the following conditions:
   *
   *   The above copyright notice and this permission notice shall be included in all
   *   copies or substantial portions of the Software.
   *
   *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   *   SOFTWARE.
   */
  
  package com.alibaba.tac.engine.code;
  
  import java.io.File;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.net.URLClassLoader;
  
  /**
   * the CustomerClassLoader
   */
  public class CustomerClassLoader extends URLClassLoader {
  
      static {
  
          extClassLoader = CustomerClassLoader.getSystemClassLoader().getParent();
      }
  
      private static ClassLoader extClassLoader;
  
  
      public CustomerClassLoader(URL[] urls) {
          super(urls, CustomerClassLoader.class.getClassLoader());
      }
  
      public CustomerClassLoader(File file) throws MalformedURLException {
          super(new URL[] {file.toURI().toURL()}, CustomerClassLoader.class.getClassLoader());
      }
  
      public CustomerClassLoader(URL[] urls, ClassLoader parent) {
          super(urls, parent);
      }
  
      public CustomerClassLoader(File file, ClassLoader parent) throws MalformedURLException {
          super(new URL[] {file.toURI().toURL()}, parent);
      }
  
      /**
       *
       * @param name
       * @param resolve
       * @return
       * @throws ClassNotFoundException
       *
       * @see ClassLoader#loadClass(java.lang.String, boolean)
       */
      @Override
      protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
  
          ClassLoader parent = this.getParent();
  
          synchronized (getClassLoadingLock(name)) {
              // First, check if the class has already been loaded
              Class<?> c = findLoadedClass(name);
              if (c == null) {
                  long t0 = System.nanoTime();
                  try {
                      if (parent != null) {
                          c = parent.loadClass(name);
                      }
                  } catch (ClassNotFoundException e) {
                      // ClassNotFoundException thrown if class not found
                      // from the non-null parent class loader
                  }
  
                  if (c == null) {
                      // If still not found, then invoke findClass in order
                      // to find the class.
                      long t1 = System.nanoTime();
                      c = findClass(name);
  
                      // this is the defining class loader; record the stats
                      sun.misc.PerfCounter.getParentDelegationTime().addTime(t1 - t0);
                      sun.misc.PerfCounter.getFindClassTime().addElapsedTimeFrom(t1);
                      sun.misc.PerfCounter.getFindClasses().increment();
                  }
              }
              if (resolve) {
                  resolveClass(c);
              }
              return c;
          }
      }
  }
  