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package vtk.test;
import vtk.vtkIdTypeArray;
import vtk.vtkJavaTesting;
import vtk.vtkObject;
import vtk.vtkObjectBase;
import vtk.vtkReferenceInformation;
import vtk.vtkSelection;
import vtk.vtkSelectionNode;
/**
* This test should run indefinitely, occasionally outputting
* "N references deleted".
*
* It is an example of how to execute a non-interactive intense processing Java
* script using VTK with manual garbage collection.
*/
public class ManualGC {
private static vtkIdTypeArray createSelection() {
vtkSelection sel = new vtkSelection();
vtkSelectionNode node = new vtkSelectionNode();
vtkIdTypeArray arr = new vtkIdTypeArray();
node.SetSelectionList(arr);
sel.AddNode(node);
return arr;
}
public static void main(String[] args) {
try {
vtkJavaTesting.Initialize(args, true);
int count = 0;
long timeout = System.currentTimeMillis() + 60000; // +1 minute
while (System.currentTimeMillis() < timeout) {
// When the selection is deleted,
// it will decrement the array's reference count.
// If GC is done on a different thread, this will
// interfere with the Register/Delete calls on
// this thread and cause a crash. In general, the code
// executed in a C++ destructor can do anything, so it
// is never safe to delete objects on one thread while
// using them on another.
//
// Thus we no longer implement finalize() for VTK objects.
// We must manually call
// vtkObject.JAVA_OBJECT_MANAGER.gc(true/false) when we
// want to collect unused VTK objects.
vtkIdTypeArray arr = createSelection();
for (int i = 0; i < 10000; ++i) {
arr.Register(null);
vtkObjectBase.VTKDeleteReference(arr.GetVTKId());
}
++count;
if (count % 100 == 0) {
vtkReferenceInformation infos = vtkObject.JAVA_OBJECT_MANAGER.gc(false);
System.out.println(infos.toString());
}
}
vtkJavaTesting.Exit(vtkJavaTesting.PASSED);
} catch (Throwable e) {
e.printStackTrace();
vtkJavaTesting.Exit(vtkJavaTesting.FAILED);
}
}
}
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