public void return_correct_min_element_and_remove_it_from_heap_on_delete_min_operation()
{
_heap.Add(7);
_heap.Add(5);
_heap.Add(3);
Assert.That(_heap.DeleteMin(), Is.EqualTo(3));
Assert.That(_heap.Count, Is.EqualTo(2));
}
private void PurgeTimedOutRequests()
{
if (_doNotTimeout)
{
return;
}
try {
while (_pending.Count > 0)
{
var req = _pending.FindMin();
if (req.Item1 <= DateTime.UtcNow || req.Item2.IsProcessing)
{
req = _pending.DeleteMin();
req.Item2.ReplyStatus(HttpStatusCode.RequestTimeout,
"Server was unable to handle request in time",
e => Log.Debug(
"Error occurred while closing timed out connection (HTTP service core): {e}.",
e.Message));
}
else
{
break;
}
}
} catch (Exception exc) {
Log.ErrorException(exc, "Error purging timed out requests in HTTP request processor.");
}
}
// Test program
public static void Main(string[] args)
{
PairingHeap <int> h = new PairingHeap <int>( );
int numItems = 10000;
int i = 37;
int j;
Console.WriteLine("Checking; no bad output is good");
for (i = 37; i != 0; i = (i + 37) % numItems)
{
h.Insert(i);
}
for (i = 1; i < numItems; i++)
{
if (h.DeleteMin( ) != i)
{
Console.WriteLine("Oops! " + i);
}
}
List <IPriorityQueuePosition <int> > p = new List <IPriorityQueuePosition <int> >( );
for (i = 0; i < numItems; i++)
{
p.Add(null);
}
for (i = 0, j = numItems / 2; i < numItems; i++, j = (j + 71) % numItems)
{
p[j] = h.Insert(j + numItems);
}
for (i = 0, j = numItems / 2; i < numItems; i++, j = (j + 53) % numItems)
{
h.DecreaseKey(p[j], p[j].GetValue( ) - numItems);
}
i = -1;
while (!h.IsEmpty( ))
{
if (h.DeleteMin( ) != ++i)
{
Console.WriteLine("Oops! " + i + " ");
}
}
Console.WriteLine("Check completed");
}
public IEnumerable <OutstandingMessage> GetMessagesExpiringBefore(DateTime time)
{
while (_byTime.Count > 0 && _byTime.FindMin().DueTime <= time)
{
var item = _byTime.DeleteMin();
OutstandingMessage m;
if (_outstandingRequests.TryGetValue(item.MessageId, out m))
{
yield return(_outstandingRequests[item.MessageId]);
_outstandingRequests.Remove(item.MessageId);
_bySequences.Remove(m.ResolvedEvent.OriginalEventNumber);
}
}
}
// Single-source weighted shortest-path algorithm using pairing heaps.
public void Dijkstra2(string startName)
{
IPriorityQueue <Path> pq = new PairingHeap <Path>();
Vertex start = vertexMap[startName]; // throws an exception if not found
ClearAll();
start.pos = pq.Insert(new Path(start, 0));
start.dist = 0;
while (!pq.IsEmpty())
{
Path vrec = pq.DeleteMin();
Vertex v = vrec.dest;
foreach (Edge e in v.adj)
{
Vertex w = e.dest;
double cvw = e.cost;
if (cvw < 0)
{
throw new GraphException("Graph has negative edges");
}
if (w.dist > v.dist + cvw)
{
w.dist = v.dist + cvw;
w.prev = v;
Path newVal = new Path(w, w.dist);
if (w.pos == null)
{
w.pos = pq.Insert(newVal);
}
else
{
pq.DecreaseKey(w.pos, newVal);
}
}
}
}
}
public void throw_invalidoperationexception_when_trying_to_delete_min_element_on_empty_queue()
{
Assert.Throws <InvalidOperationException>(() => _heap.DeleteMin());
}
public void TestAllOperationsOnRandomNumbers()
{
int count = 10000; //MIN IS 100
int idCounter = 1;
List <Plane> planes = new List <Plane>(count);
List <Plane> removed = new List <Plane>(count);
PairingHeap <Plane, int> queue = new PairingHeap <Plane, int>();
Random random = new Random();
int addCount = 0, succAddCount = 0,
changePriorityCount = 0, succChangePriorityCount = 0,
deleteCount = 0, succDeleteCount = 0,
compareCheck = 0;
String history = "";
int deleteFileNumber = 1;
for (int i = 0; i < count; i++)
{
int number = random.Next(0, 100 * count);
if (number % 5 == 0 || number % 5 == 3 || number % 5 == 4)
{
addCount++;
Plane newPlane = new Plane();
newPlane.SetInternationalID("id" + idCounter);
idCounter++;
newPlane.SetPriority(random.Next(11));
if (queue.Add(newPlane))
{
succAddCount++;
history += "ADDED: " + newPlane.GetInternationalID() + " with priority " + newPlane.GetPriority() + "\r\n";
history += "ROOT: " + queue.Root.Data.GetInternationalID() + " with priority "
+ queue.Root.Data.GetPriority() + "\r\n";
planes.Add(newPlane);
}
}
else
if (number % 5 == 1 || number % 5 == 2)
{
deleteCount++;
if (planes.Count > 0)
{
Plane toDelete = queue.DeleteMin();
if (toDelete != null)
{
history += "" + toDelete.GetInternationalID() + "\r\n";
succDeleteCount++;
planes.Remove(toDelete);
removed.Add(toDelete);
history += "DELETED: " + toDelete.GetInternationalID() + " with priority " + toDelete.GetPriority() + "\r\n";
if (queue.Root != null)
{
history += "ROOT: " + queue.Root.Data.GetInternationalID() + " with priority "
+ queue.Root.Data.GetPriority() + "\r\n";
}
else
{
history += "EMPTY HEAP\r\n";
}
}
}
if (removed.Count > 0)
{
Plane errorneousPlane = queue.Delete(removed[random.Next(0, removed.Count)]); // SHOULD DO NOTHING
if (errorneousPlane != null)
{
history += "???DELETED: " + errorneousPlane.GetInternationalID()
+ " with priority " + errorneousPlane.GetPriority() + "\r\n";
if (queue.Root != null)
{
history += "ROOT: " + queue.Root.Data.GetInternationalID() + " with priority "
+ queue.Root.Data.GetPriority() + "\r\n";
}
else
{
history += "EMPTY HEAP\r\n";
}
}
}
}
if (count >= 100 && number % 100 == 0)
{
changePriorityCount++;
if (planes.Count > 0)
{
int newPriority = random.Next(11);
int randomIndex = random.Next(0, planes.Count);
if (newPriority != planes[randomIndex].GetPriority())
{
Assert.IsTrue(queue.ChangePriority(planes[randomIndex],
newPriority));
planes[randomIndex].SetPriority(newPriority);
succChangePriorityCount++;
}
}
if (removed.Count > 0)
{
int newPriority = random.Next(11);
int randomIndex = random.Next(0, removed.Count);
if (newPriority != removed[randomIndex].GetPriority())
{
Assert.IsFalse(queue.ChangePriority(removed[randomIndex],
newPriority));
}
}
if (planes.Count > 0)
{
int randomIndex = random.Next(0, planes.Count);
Plane randomDelete = queue.Delete(planes[randomIndex]);
if (randomDelete != null)
{
planes.RemoveAt(randomIndex);
removed.Add(randomDelete);
}
deleteFileNumber++;
}
compareCheck++;
File.WriteAllText("D:\\.NET Projects\\PlaneDepartureTracking\\PlaneDepartureTrackingMSTest\\pairingheapTestHistory.txt",
history);
foreach (Plane plane in planes)
{
Assert.IsTrue(queue.Contains(plane));
}
foreach (Plane plane in removed)
{
Assert.IsFalse(queue.Contains(plane));
}
}
}
String treeTraversalLevelOrder = queue.TraverseLevelOrder();
File.WriteAllText("D:\\.NET Projects\\PlaneDepartureTracking\\PlaneDepartureTrackingMSTest\\pairingheapTestLevelOrder.txt",
treeTraversalLevelOrder);
String treeTraversalInOrder = queue.TraverseInOrder();
File.WriteAllText("D:\\.NET Projects\\PlaneDepartureTracking\\PlaneDepartureTrackingMSTest\\pairingheapTestInOrder.txt",
treeTraversalInOrder);
String checkInfo = "ADD checks: " + addCount + "\r\nSuccessfully added elements: " + succAddCount +
"\r\nCHANGE PRIORITY checks: " + changePriorityCount + "\r\nSuccessfully changed priorities: " + succChangePriorityCount +
"\r\nDELETE checks: " + deleteCount + "\r\nSuccessfully deleted elements: " + succDeleteCount +
"\r\nQueue-List comparisons: " + compareCheck;
File.WriteAllText("D:\\.NET Projects\\PlaneDepartureTracking\\PlaneDepartureTrackingMSTest\\pairingheapTestStats.txt",
checkInfo);
File.WriteAllText("D:\\.NET Projects\\PlaneDepartureTracking\\PlaneDepartureTrackingMSTest\\pairingheapTestHistory.txt",
history);
}
