/*
 * Copyright (C) 2014, United States Government, as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All rights reserved.
 *
 * The Java Pathfinder core (jpf-core) platform is 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 gov.nasa.jpf.vm.multiProcess;

import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.List;

import gov.nasa.jpf.util.test.TestMultiProcessJPF;
import gov.nasa.jpf.vm.ClassInfo;
import gov.nasa.jpf.vm.ClassLoaderInfo;

import org.junit.Test;

/**
 * @author Nastaran Shafiei <nastaran.shafiei@gmail.com>
 */
public class TypeSeparationTest extends TestMultiProcessJPF {

  private static int counter = 0;

  private static void incCounter() {
    counter++;
  }

  // To make sure that our multiProcess VM keeps the static attributes separated
  // This also checks for type safe clone for the InvokeStatic instruction.
  @Test
  public void staticCounterTest() {
    // Note that this code is executed 4 times. Since every time this is executed its
    // state is restored, the value of counter should be always 1
    if (mpVerifyNoPropertyViolation(2)) {
      int id = getProcessId();
      switch(id) {
      case 0:
        incCounter();
        break;
      case 1:
        incCounter();
        break;
      default:
        fail("invalid process number!");
      }

      assertEquals(counter,1);
    }
  }

  @Retention(RetentionPolicy.RUNTIME)
  @Inherited
  public @interface A0 {
  }

  private native void keepAnnotationClass(Class annCls, int prcId);

  @Test
  public void annotationsTest () {
    if(!isJPFRun()) {
      JPF_gov_nasa_jpf_vm_multiProcess_TypeSeparationTest.resetPrcIds();
    }

    if (mpVerifyNoPropertyViolation(2)) {
      int prcId = getProcessId();
      keepAnnotationClass(A0.class, prcId);
    }

    if(!isJPFRun()) {
      List<ClassInfo> annClassList = JPF_gov_nasa_jpf_vm_multiProcess_TypeSeparationTest.getAnnotationClasses();
      assertEquals(annClassList.size(), 2);
      assertTrue(annClassList.get(0)!=annClassList.get(1));
    }
  }


  private native void keepClassLoader(ClassLoader thd, int prcId);

  // to make sure that each process accesses the classes loaded by the right
  // system class loader
  @Test
  public void systemClassLoaderTest() {
    if(!isJPFRun()) {
      JPF_gov_nasa_jpf_vm_multiProcess_TypeSeparationTest.resetPrcIds();
    }

    if (mpVerifyNoPropertyViolation(2)) {
      ClassLoader cl = Object.class.getClassLoader();

      // in our implementation this goes through the class hierarchy of the 
      // current thread and it returns the class loader of the Thread class
      ClassLoader sysLoader = ClassLoader.getSystemClassLoader();
      assertEquals(cl, sysLoader);

      int prcId = getProcessId();
      keepClassLoader(cl, prcId);
    }

    if(!isJPFRun()) {
      List<ClassLoaderInfo> classLoaders = JPF_gov_nasa_jpf_vm_multiProcess_TypeSeparationTest.getClassLoaders();
      assertEquals(classLoaders.size(), 2);
      assertTrue(classLoaders.get(0)!=classLoaders.get(1));
    }
  }
}