private async Task <MazebotResult> PostSolution(MazebotResponse mazebotMaze, NavigationDetails solution)
{
MazebotResult result = null;
if (solution.Arrived)
{
result = await _apiClient.SolveMazebotMaze(mazebotMaze.MazePath, solution.PathTaken);
}
return(result);
}
public async void Navigate_On_Swarm_Mode_Should_Return_The_First_Task_That_Completes_With_Arrived_True_Result()
{
var result1 = new NavigationDetails {
Arrived = true, PathTaken = "result1"
};
var task1 = Task.Run(() => { Task.Delay(300); return(result1); });
var crawler1 = Substitute.For <IMazeCrawler>();
crawler1.Navigate().Returns(task1);
var result2 = new NavigationDetails {
Arrived = true, PathTaken = "result2"
};
var task2 = Task.Run(() => { Task.Delay(500); return(result2); });
var crawler2 = Substitute.For <IMazeCrawler>();
crawler2.Navigate().Returns(task2);
var task3 = Task.Run(() => { Task.Delay(100); return(new NavigationDetails {
Arrived = false
}); });
var crawler3 = Substitute.For <IMazeCrawler>();
crawler3.Navigate().Returns(task3);
var crawlers = new [] { crawler1, crawler2, crawler3 };
var swarmCoordinator = Substitute.For <ISwarmCoordinator>();
swarmCoordinator.GetSwarm(Arg.Any <IMazeCrawlerState>()).Returns(crawlers);
var crawlerCoordinator = Substitute.For <IMazeCrawlerCoordinator>();
crawlerCoordinator.RequestSwarm(Arg.Any <IMazeCrawlerState>()).Returns(swarmCoordinator);
var context = new MazeCrawlerContext
{
Start = new Coordinates(0, 0),
Destination = new Coordinates(0, 1),
NavigationMap = new Map(new char[][]
{
new [] { Map.EMPTY, Map.EMPTY },
new [] { Map.EMPTY, Map.OCCPD }
}),
NavigationMode = CrawlerNavigationMode.Swarm,
Coordinator = crawlerCoordinator
};
var crawler = new MazeCrawler(context);
var response = await crawler.Navigate();
response.Should().BeEquivalentTo(result1);
}
#pragma warning disable CS1998,CS4014
private async Task <NavigationDetails> SwarmNavigate()
{
var swarmCoordinator = _coordinator.RequestSwarm(this);
var swarm = swarmCoordinator.GetSwarm(this);
Trace($"Received {swarm.Count()} crawler(s) from the swarm.");
NavigationDetails result = null;
var tasks = new Dictionary <int, Task>();
var cancelationSource = new CancellationTokenSource();
foreach (var crawler in swarm)
{
// Add the Navigate task of each MazeCrawler to a list and remove it once it completes.
Trace($"Crawler {crawler.Id} to continue with the navigation.");
var task = Task.Run(() => crawler.Navigate(), cancelationSource.Token);
tasks.Add(task.Id, task);
task.ContinueWith(completed =>
{
lock (tasks)
{
Trace($"Swarm with task#{completed.Id} completed its navigation.");
if (completed.IsCompletedSuccessfully && completed.Result.Arrived)
{
// Cancel the other Navigate tasks from the list since the destination Coordinates has been reached already.
result = completed.Result;
Trace($"Crawler with task#{completed.Id} arrived. Reporting arrival.");
cancelationSource.Cancel();
}
tasks.Remove(completed.Id);
Trace($"Swarm has {tasks.Count()} task(s) left.");
}
});
while (tasks.Count() > 0)
{
await Task.Delay(25);
}
;
}
cancelationSource.Dispose();
return(result ?? new NavigationDetails {
Arrived = false
});
}
public async void Navigate_Should_Call_Spawned_IMazeCrawler_Navigate()
{
_queen.ScanMap(new Coordinates(1, 2), new Coordinates(3, 4), new Map(new char[0][]));
var expected = new NavigationDetails();
var crawler = Substitute.For <IMazeCrawler>();
crawler.Navigate().Returns(expected);
_spawner.Spawn(Arg.Any <MazeCrawlerContext>()).Returns(crawler);
var response = await _queen.Navigate();
await crawler.Received(1).Navigate();
response.Should().Be(expected);
}
public async Task <NavigationDetails> Navigate()
{
Trace($"Starting navigation preference: {string.Join(',', _preference )}.");
NavigationDetails response = null;
switch (NavigationMode)
{
case CrawlerNavigationMode.Scout:
// Scout will force the MazeCrawler to traverse by itself the map starting from its current Coordinates until it reaches the destination Coordinates (or a deadend is reached).
response = Scout();
break;
case CrawlerNavigationMode.Swarm:
// Swarm will make the MazeCrawler to traverse the map by itself until it reaches a path that forks.
// When this happens, the MazeCrawler will request for other MazeCrawlers and will force each of them to traverse the succeeding path (one for each fork on the path).
response = await Swarm();
break;
}
return(response);
}