public void MultiThread_NumbersAreUnique()
{
var collection = new BlockingCollection <int>();
Parallel.ForEach(Enumerable.Range(0, 1000), i =>
{
var random = GameRandom.Between(int.MinValue, int.MaxValue);
collection.Add(random);
});
output.WriteLine($"Repeated values: {collection.Count() - collection.Distinct().Count()}");
Assert.True(collection.Distinct().Count() == collection.Count());
}
static void Main(string[] args)
{
string conString = "127.0.0.1:2181";
new IdHelperBootstrapper()
.UseZookeeper(conString, 200, "Test")
.Boot();
Console.WriteLine($"WorkerId:{IdHelper.WorkerId}");
Stopwatch watch = new Stopwatch();
watch.Start();
List <Task> tasks = new List <Task>();
BlockingCollection <string> ids = new BlockingCollection <string>();
for (int i = 0; i < 4; i++)
{
tasks.Add(Task.Run(() =>
{
for (int j = 0; j < 1000000; j++)
{
ids.Add(IdHelper.GetId());
}
}));
}
Task.WaitAll(tasks.ToArray());
watch.Stop();
Console.WriteLine($"耗时:{watch.ElapsedMilliseconds}ms,是否有重复:{ids.Count != ids.Distinct().Count()}");
}
public void Should_never_return_different_boards_for_same_name_when_used_from_multiple_threads()
{
const int threadCount = 5;
const int getCount = 100;
var boards = new BlockingCollection <DrawingBoard>();
var tasks = new List <Task>();
var allStarted = new SemaphoreSlim(threadCount);
var startGetting = new ManualResetEventSlim();
Action getBoard = () =>
{
allStarted.Release();
startGetting.Wait();
for (var j = 0; j < getCount; j++)
{
boards.Add(_service.Get("test"));
}
};
for (var i = 0; i < threadCount; i++)
{
var task = Task.Factory.StartNew(getBoard);
tasks.Add(task);
}
allStarted.Wait();
startGetting.Set();
Task.WaitAll(tasks.ToArray());
var distinctBoardCount = boards.Distinct().Count();
Assert.That(distinctBoardCount, Is.EqualTo(1));
}
public int SortAndWriteToFile()
{
var sortedCollection = _collection.Distinct().OrderBy(x => x.Key);
File.WriteAllLines(Common.Common.OutputFileName, sortedCollection.Select(s => s.Value.ToString()).ToList());
return(sortedCollection.Count());
}
public static List <TokenString> NewTokenStrings(int tokenMask, int Capacity)
{
var tokens = new BlockingCollection <TokenString>();
Parallel.For(1, (int)(Capacity * 1.08), (i, state) => { tokens.Add(NewTokenString(tokenMask)); });
return(tokens.Distinct().Take(Capacity).ToList());
}
public void Can_GenerateUniqueAplhaNumericStrings_ForMillionIterations_MultiThreaded()
{
var fragments = new BlockingCollection <string>();
Parallel.For(0, 1000000, i =>
{
var generatedFragment = GenerateFragment(fragments);
ValidateGeneratedFragment(generatedFragment);
});
bool success = fragments.Count == fragments.Distinct().Count();
if (!success)
{
Debug.WriteLine(fragments.Count);
Debug.WriteLine(fragments.Distinct().Count());
}
Assert.IsTrue(success);
}
public void GetDouble_ManyThreads_DiffRandomResult()
{
var target = new FastRandomRandomization();
var actual = new BlockingCollection <int>();
Parallel.For(0, 1000, (i) =>
{
actual.Add(target.GetInt(0, int.MaxValue));
});
Assert.AreEqual(1000, actual.Count);
Assert.AreEqual(1000, actual.Distinct().Count());
}
public void should_return_mostly_unique_values()
{
BlockingCollection <int> values = new BlockingCollection <int>();
Parallel.For(0, 100,
new ParallelOptions {
MaxDegreeOfParallelism = 10
},
(i, loop) => values.Add(ARandom.IntBetween(int.MinValue, int.MaxValue)));
// Allow for occasional duplicate
values.Distinct().Count().Should().BeInRange(99, 100);
}
public void GetDouble_ManyThreads_DiffRandomResult()
{
var target = new BasicRandomization();
var actual = new BlockingCollection<int>();
Parallel.For(0, 1000, (i) =>
{
actual.Add(target.GetInt(0, int.MaxValue));
});
Assert.AreEqual(1000, actual.Count);
Assert.AreEqual(1000, actual.Distinct().Count());
}
public static void GetIdTest()
{
string conString = "127.0.0.1:2181";
new IdHelperBootstrapper()
.UseZookeeper(conString, 200, "Test")
//.SetWorkderId(1)
.Boot();
//Console.WriteLine($"WorkerId:{IdHelper.WorkerId}");
//while (true)
//{
// try
// {
// Console.WriteLine($"WorkerId:{IdHelper.WorkerId},Id:{IdHelper.GetId()}");
// }
// catch (Exception ex)
// {
// Console.WriteLine(ex.Message);
// }
// finally
// {
// Thread.Sleep(1000);
// }
//}
Stopwatch watch = new Stopwatch();
watch.Restart();
List <Task> tasks = new List <Task>();
BlockingCollection <string> ids = new BlockingCollection <string>();
for (int i = 0; i < 4; i++)
{
tasks.Add(Task.Run(() =>
{
for (int j = 0; j < 1000000; j++)
{
ids.Add(IdHelper.GetId());
}
}));
}
Task.WaitAll(tasks.ToArray());
watch.Stop();
Console.WriteLine($"耗时:{watch.ElapsedMilliseconds}ms,是否有重复:{ids.Count != ids.Distinct().Count()}");
}
public void SequentialGuid()
{
List <Task> tasks = new List <Task>();
BlockingCollection <Guid> guids = new BlockingCollection <Guid>();
for (int i = 0; i < 4; i++)
{
tasks.Add(Task.Run(() =>
{
for (int j = 0; j < 1000000; j++)
{
guids.Add(GuidHelper.NewGuid());
}
}));
}
Task.WaitAll(tasks.ToArray());
Assert.AreEqual(guids.Distinct().Count(), 4000000);
}
public void NextId_Duplicate_issues_2_Test()
{
var snowflakeIdWorker = new SnowflakeIdWorker(1, 1);
var blockingCollection = new BlockingCollection <long>();
var tasks = new List <Task>();
for (int i = 0; i < 100; i++)
{
var task = Task.Run(() =>
{
for (int j = 0; j < 10000; j++)
{
blockingCollection.Add(snowflakeIdWorker.NextId());
}
});
tasks.Add(task);
}
Task.WaitAll(tasks.ToArray());
Assert.AreEqual(1000000, blockingCollection.Distinct().Count());
}
/// <summary>
/// Service entry point
/// </summary>
/// <param name="tvMazeApiService">TVMazeApi HttpClient Service</param>
/// <param name="dbContext">MS SQL Db Context</param>
/// <param name="cancellationToken"></param>
/// <param name="logger">Logger service</param>
/// <returns></returns>
public async Task ExecuteAsync(TVMazeAPIService tvMazeApiService, TVMazeDBContext dbContext, CancellationToken cancellationToken, ILogger logger)
{
DateTime startTime = DateTime.Now;
//We need to check last pack of shows, maybe we have a new ones in it
bool tryFirstPack = true;
_tvMazeApiService = tvMazeApiService;
//HttpClient Retry Policy
var maxRetryAttempts = 3;
var pauseBetweenFailures = TimeSpan.FromSeconds(10);
var retryPolicy = Policy
.Handle <HttpRequestException>()
.WaitAndRetryAsync(maxRetryAttempts, i => pauseBetweenFailures);
//Select max show id into local database
var maxShowId = dbContext.TVMazeShow.Select(s => s.Id).DefaultIfEmpty(0).Max();
//Calc next pageIndex for TVMazeAPI
var pageIndex = (maxShowId == 0) ? 0 : (int)Math.Floor((double)maxShowId / 250) + 1;
while (true)
{
IEnumerable <TVMazeShow> showsList = null;
//need to check pack pack for new shows
if (tryFirstPack && maxShowId != 0 && maxShowId < 250 * pageIndex - 1)
{
logger.Log(LogLevel.None, $"Pack with index={pageIndex - 1} loading started");
//Get Shows list by page index
showsList = await retryPolicy.ExecuteAsync(async() =>
{
return(await LoadShowsPack(pageIndex - 1));
});
showsList = showsList.Where(show => show.Id > maxShowId);
//New shows into last pack not found - check the next pack
if (!showsList.Any())
{
logger.Log(LogLevel.None, $"Pack with index={pageIndex - 1} doesn't contain new shows");
tryFirstPack = false;
continue;
}
}
else
{
tryFirstPack = false;
logger.Log(LogLevel.None, $"Pack with index={pageIndex} loading started");
//Get Shows list by page index
showsList = await retryPolicy.ExecuteAsync(async() =>
{
return(await LoadShowsPack(pageIndex));
});
//Show page request return NotFound, Nothing to synchronize
if (showsList == null)
{
logger.Log(LogLevel.None, $"Pack with index={pageIndex} Not Found");
logger.Log(LogLevel.None, "Loading process totaly finished");
return;
}
}
using (var personsList = new BlockingCollection <TVMazePerson>())
using (var castsList = new BlockingCollection <TVMazeCast>())
{
foreach (var show in showsList)
{
IEnumerable <TVMazePerson> showCastsList;
//Get casts for each show
showCastsList = await retryPolicy.ExecuteAsync(async() =>
{
return(await LoadShowCasts(show));
});
showCastsList.ToList().ForEach(cast =>
{
personsList.Add(cast);
castsList.Add(new TVMazeCast()
{
ShowId = show.Id, PersonId = cast.Id
});
});
}
;
//Insert downloaded data into database
using (var transaction = dbContext.Database.BeginTransaction())
{
try
{
dbContext.Database.ExecuteSqlCommand("SET IDENTITY_INSERT " + typeof(TVMazePerson).Name + " ON;");
var insertedPersonsCount = dbContext.TVMazePerson.AddNoDublicate(personsList.Distinct().ToList());
dbContext.SaveChanges();
dbContext.Database.ExecuteSqlCommand("SET IDENTITY_INSERT " + typeof(TVMazePerson).Name + " OFF;");
dbContext.Database.ExecuteSqlCommand("SET IDENTITY_INSERT " + typeof(TVMazeShow).Name + " ON;");
var insetredShowsCount = showsList.Count();
dbContext.TVMazeShow.AddRange(showsList);
dbContext.SaveChanges();
dbContext.Database.ExecuteSqlCommand("SET IDENTITY_INSERT " + typeof(TVMazeShow).Name + " OFF;");
var castsForInsert = castsList.Distinct();
var insertedCastsCount = castsForInsert.Count();
dbContext.TVMazeCast.AddRange(castsForInsert);
dbContext.SaveChanges();
transaction.Commit();
logger.Log(LogLevel.None, $"{insetredShowsCount} shows inserted, {insertedCastsCount} casts inserted, {insertedPersonsCount} persons inserted");
logger.Log(LogLevel.None, $"Pack with index={(tryFirstPack ? pageIndex - 1 : pageIndex)} loading finished");
}
catch (Exception ex)
{
logger.LogError(ex, "An error occurred inserting the DB.");
}
}
if (!tryFirstPack)
{
pageIndex++;
}
tryFirstPack = false;
}
}
}