public Result SearchTrip(QueryBuilder queryTrip)
{
// Error! Search range cannot be a negative number!
if (queryTrip.Range < 0)
{
SearchTripError error = new SearchTripError();
error.Comment = "Search range must be a non-negative number!";
return error;
}
/** Check if the current node is the nearest node to the departure location. */
string targetNode = NearestNodeToDeparture(queryTrip.DepartureName);
if (!targetNode.Equals(NodeName))
{
Console.WriteLine("Decision: sending SearchTripCommand to : {0}", targetNode);
ForwardRequiredResult forwardRequest = new ForwardRequiredResult();
forwardRequest.RequestID = serviceImpl.generateGUID();
forwardRequest.Destination = baseForwardAddress + targetNode;
return forwardRequest;
}
// The Search has no range criteria. We can perform a simple search or
// a simple forward request.
if (queryTrip.Range == 0)
{
Console.WriteLine("Testing Range 0");
List<Trip> matchingTrip = GetTripZeroRange(queryTrip);
SearchTripResult searchResult = new SearchTripResult(matchingTrip);
searchResult.OriginalQueryID = queryTrip.ID;
Console.WriteLine("{0} {1} Trip(s) were found in {2}", serviceImpl.LogTimestamp, matchingTrip.Count, NodeName);
return searchResult;
}
// The client specified a range for search: we need to do a more complex search
// and potentially a multiple forwarding.
else
{
Location departureLoc = GMapsAPI.addressToLocation(queryTrip.DepartureName);
LocationRange departureLocRange = new LocationRange(departureLoc.Latitude, departureLoc.Longitude, queryTrip.Range);
List<Trip> matchingTrip = GetTripWithRange(queryTrip, departureLocRange);
SearchTripResult searchResult = new SearchTripResult(matchingTrip);
searchResult.OriginalQueryID = queryTrip.ID;
Console.WriteLine("{0} {1} Trip(s) were found in {2}", serviceImpl.LogTimestamp, matchingTrip.Count, NodeName);
/** Check if there are other neighbour nodes within the range of search. */
string[] targetNeighbours = NeighbourNodesInRange(departureLocRange);
if (targetNeighbours.Length > 0)
{
foreach (string n in targetNeighbours)
{
Console.WriteLine("{0} is in range.", n);
}
return new NullResult();
}
else
{
//Console.WriteLine("No neighbour is in range.");
return searchResult;
}
}
}
private string[] NeighbourNodesInRange(LocationRange departureLocRange)
{
List<string> targetNeighbours = new List<string>();
foreach (ServiceNode neighbour in Neighbours)
{
/** The neighbour is within the range. */
if (departureLocRange.contains(neighbour.Location))
{
targetNeighbours.Add(baseForwardAddress + neighbour.NodeName);
}
}
return targetNeighbours.ToArray();
}
public List<Trip> GetTripWithRange(QueryBuilder filterTrip, LocationRange departureLocRange)
{
tripDatabaseLock.EnterReadLock();
try
{
tripDatabase = XDocument.Load(tripDatabasePath);
var baseQuery = (from t in tripDatabase.Descendants("Trip")
where departureLocRange.contains(new Location(Convert.ToDouble(t.Element("DepartureLatitude").Value),Convert.ToDouble(t.Element("DepartureLongitude").Value)))
select new Trip()
{
ID = Convert.ToInt32(t.Element("ID").Value),
Owner = t.Element("Owner").Value,
DepartureName = t.Element("DepartureName").Value,
DepartureDateTime = Convert.ToDateTime(t.Element("DepartureDateTime").Value),
ArrivalName = t.Element("ArrivalName").Value,
ArrivalDateTime = Convert.ToDateTime(t.Element("ArrivalDateTime").Value),
Smoke = Convert.ToBoolean(t.Element("Smoke").Value),
Music = Convert.ToBoolean(t.Element("Music").Value),
Cost = Convert.ToDouble(t.Element("Cost").Value),
FreeSits = Convert.ToInt32(t.Element("FreeSits").Value),
Notes = t.Element("Notes").Value,
Modifiable = Convert.ToBoolean(t.Element("Modifiable").Value)
});
IEnumerable<Trip> filteredQuery = FilterQuery(filterTrip, baseQuery);
return filteredQuery.ToList();
}
finally
{
tripDatabaseLock.ExitReadLock();
}
}