Examples of javax.tools.diagnostics.runtime.java.JavaHeap

Package javax.tools.diagnostics.runtime.java

Examples of javax.tools.diagnostics.runtime.java.JavaHeap

javax.tools.diagnostics.runtime.java.JavaHeap
Represents a single heap of managed objects. The heap can be viewed as an unordered collection of JavaObjects or as a region of storage within the Java Virtual Machine instance. The heap commonly contains JavaObject instances that are reachable by navigating chains of {@link JavaReference}These references can be obtained from the {@link JavaRuntime#getHeapRoots()} method.A heap can contain instances which cannot be reached by the use of {@link JavaReference}

      if (nextHeap instanceof CorruptData) {
        System.err.println("returned CorruptData `" + nextHeap + "'");
        break;
      }


      JavaHeap aJavaHeap = (JavaHeap) nextHeap;
      Iterator objects = aJavaHeap.getObjects().iterator();


      while (objects.hasNext()) {
        Object nextObject = objects.next();
        if (nextObject instanceof CorruptData) {
          System.err.println("returned CorruptData `" + nextObject + "'");

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      if (nextHeap instanceof CorruptData) {
        continue;
      }
      
      JavaHeap heap = (JavaHeap) nextHeap;
      
      for(Iterator objects = heap.getObjects().iterator(); objects.hasNext();) {
        Object nextObject = objects.next();
        
        if (nextObject instanceof CorruptData) {
          continue;          
        }

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  }
  
  public void testGetSectionsReturns() throws IOException {
    
    JavaHeap heap=getPopulatedJavaHeap();
    List i=heap.getSections();
    assertNotNull(i);
    
  }

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    assertNotNull(i);
    
  }
  public void testGetSectionsIsEmpty() throws IOException {
    
    JavaHeap heap=getPopulatedJavaHeap();
    Iterator i=heap.getSections().iterator();
    assertFalse("expected empty iterator",i.hasNext());
    
  }

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  }
  
  public void testGetObjectsReturns() throws Exception {
    
    JavaHeap heap=getPopulatedJavaHeap();
    Iterator i=heap.getObjects().iterator();
    
    int count=0;
    while (i.hasNext()) {
      JavaObject obj = (JavaObject)i.next();
      count++;

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      if (nextHeap instanceof CorruptData) {
        System.err.println("returned CorruptData `" + nextHeap + "'");
        break;
      }


      JavaHeap aJavaHeap = (JavaHeap) nextHeap;
      Iterator objects = aJavaHeap.getObjects().iterator();


      while (objects.hasNext()) {
        Object nextObject = objects.next();
        if (nextObject instanceof CorruptData) {
          System.err.println("returned CorruptData `" + nextObject + "'");

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  public JavaHeap defaultJavaHeap() {
    JavaRuntime runtime  = defaultJavaRuntime();
    Iterator it = runtime.getHeaps().iterator();
    assertNotNull(it);
    assertTrue(it.hasNext());
    JavaHeap heap = (JavaHeap) it.next();


    // This should use Middleware Heap as default
    // move on to Middleware Heap
    if (heap.getName().equalsIgnoreCase("System Heap")){
      heap = (JavaHeap) it.next();
      if (heap.getName().equalsIgnoreCase("Transient Heap")){
        heap = (JavaHeap) it.next();
      }        
    }


    return (JavaHeap) heap;

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    return (JavaHeap) heap;
  }


  public JavaObject defaultJavaObject(boolean isArray) {
    JavaObject foundObject = null;
    JavaHeap heap = defaultJavaHeap();
    Iterator objects = heap.getObjects().iterator();
    
    while ((null == foundObject) && (objects.hasNext())) {
      JavaObject oneObject = (JavaObject) objects.next();
      
      try {

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   * and that addresses outside the heap or not pointing to an object start
   * throw the expected exceptions.
   */
  public void testGetObjectAtAddress()
  {
    JavaHeap heap = defaultJavaHeap();
    JavaRuntime runtime = defaultJavaRuntime();
    ImageAddressSpace addressSpace = defaultAddressSpace();
    ImagePointer address=null;
    ImagePointer unalignedAddress=null;
    Iterator heapSections = heap.getSections().iterator();




    //determine the heap start and end address
    long heapStartAddress = Long.MAX_VALUE;
    long heapEndAddress = 0;


    Object nextElement = null;


    ImageSection currentSection = null;
    long sectionStart = 0;


    while (heapSections.hasNext()) {
      nextElement = heapSections.next();
      if (nextElement instanceof ImageSection) {
        currentSection = (ImageSection) nextElement;
        sectionStart = currentSection.getBaseAddress().getAddress();
        if (sectionStart < heapStartAddress) {
          heapStartAddress = sectionStart; 
        }
        if (sectionStart + currentSection.getSize() > heapEndAddress) {
          heapEndAddress = sectionStart + currentSection.getSize(); 
        }


      }


    }


    //check that every object in the heap can be retrieved by address
    boolean exception=false;
    for (Iterator objects = heap.getObjects().iterator();objects.hasNext();) {
      Object potentialObject = objects.next();
      JavaObject object = null;
      if (potentialObject instanceof JavaObject) {
        object = (JavaObject)potentialObject;
      } else {

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      assertNotNull(it);
      assertTrue(it.hasNext());
      while (it.hasNext()) {
        Object next = it.next();
        assertTrue(next instanceof JavaHeap);
        JavaHeap heap = (JavaHeap) next;
        Iterator objects = heap.getObjects().iterator();
        assertNotNull(objects);
        while (objects.hasNext()) {
          Object one = objects.next();
          assertTrue(one instanceof JavaObject);
        }

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