public void GetItems_Cancelation_CancelAllRequestAfterError()
{
var item = new Item();
service = new ParallelQueueKeywordsSearchService(stackExchange, config2);
A.CallTo(() => stackExchange.GetItemsAsync(A <Keyword> .Ignored, A <CancellationToken> .Ignored))
.Throws <Exception>();
var words = new[] { "1", "2", "3", "4", "5" };
Assert.Throws <KeywordsSearchExecutionException>(() => {
var res = service.GetItems(words);
});
A.CallTo(() => stackExchange.GetItemsAsync(A <Keyword> .Ignored, A <CancellationToken> .Ignored))
.MustHaveHappenedTwiceOrLess();
}
public IReadOnlyList <Item> GetItems(IEnumerable <string> words)
{
var keywords = GetKeywords(words);
var keywordsQueue = new ConcurrentQueue <Keyword>(keywords);
int httpWorkersCount = Math.Min(config.StackExchangeQueueMaxSize, keywords.Length);
var tasks = new Task <List <Item> > [httpWorkersCount];
var cts = new CancellationTokenSource();
for (int i = 0; i < httpWorkersCount; i++)
{
tasks[i] = Task.Run(async() =>
{
var res = new List <Item>();
while (!keywordsQueue.IsEmpty)
{
cts.Token.ThrowIfCancellationRequested();
if (keywordsQueue.TryDequeue(out var keyword))
{
var items = await stackExchange.GetItemsAsync(keyword, cts.Token);
res.AddRange(items);
}
}
return(res);
});
}
try
{
Task.WaitAll(tasks);
}
catch (AggregateException e)
{
throw new KeywordsSearchExecutionException("Error ", e);
}
var res = ArgegateTasksResult(tasks);
return(res.OrderBy(x => x.CreationDate).ToArray());
}