content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * 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.
   */
  
  import java.lang.reflect.Method;
  import java.lang.reflect.InvocationTargetException;
  
  class DebugProxy implements java.lang.reflect.InvocationHandler {
    private Object obj;
    static Class<?>[] interfaces = {Foo.class};
  
    public static Object newInstance(Object obj) {
      return java.lang.reflect.Proxy.newProxyInstance(
        Foo.class.getClassLoader(),
        interfaces,
        new DebugProxy(obj));
    }
  
    private DebugProxy(Object obj) {
      this.obj = obj;
    }
  
    public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
      Object result;
      if (obj == null) {
        return null;
      }
      try {
        System.out.println("before invoking method " + m.getName());
        result = m.invoke(obj, args);
      } catch (InvocationTargetException e) {
        throw e.getTargetException();
      } catch (Exception e) {
        throw new RuntimeException("unexpected invocation exception: " + e.getMessage());
      } finally {
        System.out.println("after invoking method " + m.getName());
      }
      return result;
    }
  }
  
  public class Main {
    public static void call(Foo foo) {
      if (foo == null) {
        return;
      }
      foo.bar(null);
    }
  
    public static void main(String[] args) {
      System.loadLibrary(args[0]);
      Foo foo = (Foo)DebugProxy.newInstance(null);
      ensureJitCompiled(Main.class, "call");
      call(foo);
    }
  
    private static native void ensureJitCompiled(Class<?> itf, String method_name);
  }
  