// This is a HUGE test which involves actual threads and takes time,
// so technically it is not a unit test.
// But this is a sort of pet-form of the whole project, and covers the main sense of it.
// Actually, this is a code of my prototype application so it is also not well structured.
//
// Whats going on:
// - "Reader" thread produces a sequence of numbers and passes to Producer-Consumer (P-C)
// - A number of worker threads consume and "process" them (actually do nothing with a random delay)
// then pass to the next P-C
// - A "writer" thread collects all the integers passed in the list.
// The goal of the test is to ensure that the final list contains exactly the same numbers
// as produced by "reader"
public void ProducerConsumerShouldWork()
{
var readerPc = new ProducerConsumer <IntTask>(8, new ProducerConsumerQueue <IntTask>());
var processorsPcs = new List <ProducerConsumer <IntTask> >();
var finishPc = new ProducerConsumer <IntTask>(8, new ProducerConsumerQueue <IntTask>());
const int integersToReadCount = 50;
var integersToRead = new List <int>(integersToReadCount);
var rand = new Random(DateTime.Now.Millisecond);
for (var i = 0; i < integersToReadCount; i++)
{
integersToRead.Add(rand.Next(10000));
}
var readerThread = new Thread(new ThreadStart(() =>
{
var rnd = new Random(DateTime.Now.Millisecond);
var currId = 0;
for (int i = 0; i < integersToReadCount; i++)
{
var pc = new IntTask {
Id = i, Data = integersToRead[i]
};
readerPc.Push(pc);
Thread.Sleep(rnd.Next(10));
currId++;
}
readerPc.Stop();
var endPc = new IntTask {
Id = currId, Data = 0
};
finishPc.Push(endPc);
}));
readerThread.Start();
for (int i = 0; i < 4; i++)
{
var processorId = i;
var prodCons = new ProducerConsumer <IntTask>(4, new ProducerConsumerOrderedQueue <IntTask>());
processorsPcs.Add(prodCons);
var processorThread = new Thread(new ThreadStart(() =>
{
var rnd = new Random(DateTime.Now.Millisecond);
var pc = readerPc.Pop();
while (pc != null)
{
processorsPcs[processorId].Push(pc);
pc = readerPc.Pop();
Thread.Sleep(rnd.Next(1000));
}
}));
processorThread.Start();
}
var writerList = new List <int>(integersToReadCount);
var writer = new Thread(new ThreadStart(() => {
int currId = 0;
while (true)
{
var allProcessorsEmpty = true;
for (int i = 0; i < processorsPcs.Count; i++)
{
var t = processorsPcs[i].Peek();
if (t != null)
{
allProcessorsEmpty = false;
if (t.Id == currId)
{
t = processorsPcs[i].Pop();
writerList.Add(t.Data);
currId++;
}
}
}
if (allProcessorsEmpty)
{
var finishPcData = finishPc.Peek();
if (finishPcData != null && finishPcData.Id == currId)
{
break;
}
}
}
}));
writer.Start();
writer.Join();
Assert.IsTrue(integersToRead.SequenceEqual(writerList));
}