Examples of com.xuggle.ferry.RefCountedTester

com.xuggle.ferry.RefCountedTester
Internal Only. This object exists in order for the ferry test libraries to test the memory management functionality of the RefCounted class from Java. It is NOT part of the public API.

  @Test
  public void testCorrectStartingRefCount()
  {
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());
    RefCountedTester obj = RefCountedTester.make();
    assertEquals("starting ref count", 1, obj.getCurrentRefCount());
    obj.delete();
  }

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  @Test
  public void testJavaCopyKeepsRefcountConstant()
  {
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());
    RefCountedTester obj = RefCountedTester.make();
    assertEquals("starting ref count", 1, obj.getCurrentRefCount());
    RefCountedTester javaCopy = obj;
    assertEquals("java copy should keep ref the same", 1, javaCopy.getCurrentRefCount());
    javaCopy.delete();
    obj.delete();
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());
  }

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  @Test(timeout=20*1000)
  public void testNativeCopyRefcountIncrement() throws InterruptedException
  {
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());
    RefCountedTester obj = RefCountedTester.make();
    assertEquals("starting ref count", 1, obj.getCurrentRefCount());
    RefCountedTester nativeCopy = RefCountedTester.make(obj);
    assertEquals("native copy should increment", 2, obj.getCurrentRefCount());
    assertEquals("native copy should increment", 2, nativeCopy.getCurrentRefCount());
    nativeCopy.delete();
    nativeCopy = null;
    assertEquals("native copy should be decremented", 1, obj.getCurrentRefCount());
    obj.delete();
    obj = null;
    while(JNIReference.getMgr().getNumPinnedObjects() > 0)

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  @Test(timeout=20*1000)
  public void testCopyByReference() throws InterruptedException
  {
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());
    RefCountedTester obj1 = RefCountedTester.make();
    
    RefCountedTester obj2 = obj1.copyReference();
    
    assertTrue("should look like different objects", obj1 != obj2);
    assertTrue("should be equal though", obj1.equals(obj2));
    assertEquals("should have same ref count", obj1.getCurrentRefCount(), obj2.getCurrentRefCount());
    assertEquals("should have ref count of 2", 2, obj2.getCurrentRefCount());
    
    obj1.delete(); obj1 = null;
    assertEquals("should now have refcount of 1", 1, obj2.getCurrentRefCount());
    obj2.delete();
    obj2 = null;
    while(JNIReference.getMgr().getNumPinnedObjects() > 0)
    {
      byte[] bytes = new byte[1024*1024];
      bytes[0] = 0;

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  throws InterruptedException
  {
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());


    RefCountedTester obj1 = RefCountedTester.make();
    
    RefCountedTester obj2 = obj1.copyReference();
    
    assertTrue("should look like different objects", obj1 != obj2);
    assertTrue("should be equal though", obj1.equals(obj2));
    assertEquals("should have same ref count", obj1.getCurrentRefCount(), obj2.getCurrentRefCount());
    assertEquals("should have ref count of 2", 2, obj2.getCurrentRefCount());
    
    obj1 = null;
    
    // obj1 should now be unreachable, so if we try a Garbage collection it should get caught.
    while(JNIReference.getMgr().getNumPinnedObjects() > 1)
    {
      byte[] bytes = new byte[1024*1024];
      bytes[0] = 0;
      JNIReference.getMgr().gc();
    }
    // at this point the Java proxy object will be unreachable, but should be sitting in the
    // reference queue and also awaiting finalization.  The finalization should have occurred by now.
    assertEquals("should be only the first object for collection",
        1, JNIReference.getMgr().getNumPinnedObjects());        
    assertEquals("should have a ref refcount of 1", 1, obj2.getCurrentRefCount());


    obj2.delete();
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());


  }

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  public void testJNIWeakReferenceFlushQueue() throws InterruptedException
  {
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());


    RefCountedTester obj1 = RefCountedTester.make();
    assertEquals("should be no objects for collection", 
        1, JNIReference.getMgr().getNumPinnedObjects());
    
    RefCountedTester obj2 = obj1.copyReference();
    assertEquals("should be no objects for collection", 
        2, JNIReference.getMgr().getNumPinnedObjects());
    
    assertTrue("should look like different objects", obj1 != obj2);
    assertTrue("should be equal though", obj1.equals(obj2));
    assertEquals("should have same ref count",
        obj1.getCurrentRefCount(), obj2.getCurrentRefCount());
    assertEquals("should have ref count of 2", 2, obj2.getCurrentRefCount());
    
    assertEquals("should be no objects for collection", 
        2, JNIReference.getMgr().getNumPinnedObjects());


    //obj1.delete();
    obj1 = null;
    
    // obj1 should now be unreachable, so if we try a Garbage collection it should get caught.
    while(obj2.getCurrentRefCount() > 1)
    {
      byte[] bytes = new byte[1024*1024];
      bytes[0] = 0;
      JNIReference.getMgr().gc();
    }
    assertEquals("should now have a ref refcount of 1", 1, obj2.getCurrentRefCount());
    assertEquals("should be only the first object for collection",
        1, JNIReference.getMgr().getNumPinnedObjects());


    obj2.delete();
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());


  }

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   * the JVM
   */
  @Test(expected=NullPointerException.class)
  public void testDeleteThenCallRaisesException()
  {
    RefCountedTester obj = RefCountedTester.make();
    obj.delete();
    // this should raise an exception
    obj.getCurrentRefCount();
    assertEquals("should be no objects for collection", 
        0, JNIReference.getMgr().getNumPinnedObjects());


  }

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com.xuggle.ferry.RefCountedTest

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