public void TestPerformance(int addIterations, int getIterations)
{
var stopwatch = Stopwatch.StartNew();
var messages = new List <object>();
addIterations.Times(() =>
{
var message = new object();
messages.Add(message);
c.AttachHeader(message, "whatever", "some value");
});
getIterations.Times(() =>
{
foreach (var message in messages)
{
var customHeaders = c.GetHeadersFor(message);
customHeaders.ShouldContainKeyAndValue("whatever", "some value");
}
});
Console.WriteLine("{0} + {1} took {2:0.0} s", addIterations, getIterations, stopwatch.Elapsed.TotalSeconds);
}
public void IsReliableAlsoWhenUsedByManyThreads(int howManyThreads, int numberOfIterations)
{
var reads = 0;
var writes = 0;
var headersAttached = 0;
var headersActuallyFound = 0;
Action printStats = () => Console.WriteLine("Reads: {0}. Writes: {1}. Buckets: {2}.", reads, writes, c.headers.Count);
using (var printTimer = new Timer())
{
printTimer.Interval = 2000;
printTimer.Elapsed += (s, a) => printStats();
printTimer.Start();
var threads = Enumerable
.Range(1, howManyThreads)
.Select(no => string.Format("Thread#{0}", no))
.Select(name => new Thread(() =>
{
var random = new Random();
var messages = new List <object>();
for (var count = 0; count < numberOfIterations; count++)
{
if (random.Next(2) == 0)
{
var message = new object();
messages.Add(message);
c.AttachHeader(message, name + ".key", "some value");
Interlocked.Increment(ref headersAttached);
Interlocked.Increment(ref writes);
}
else
{
var randomMessage = messages[random.Next(messages.Count)];
var headers = c.GetHeadersFor(randomMessage);
string randomKey;
do
{
randomKey = name + ".random." + random.Next(10000);
} while (headers.ContainsKey(randomKey));
Interlocked.Increment(ref headersAttached);
c.AttachHeader(randomMessage, randomKey, "RANDOOOOM!");
Interlocked.Increment(ref reads);
}
}
foreach (var message in messages)
{
Interlocked.Add(ref headersActuallyFound, c.GetHeadersFor(message).Count);
}
}))
.ToList();
threads.ForEach(t => t.Start());
threads.ForEach(t => t.Join());
}
printStats();
Console.WriteLine("Expected total of {0} headers - found {1}", headersAttached, headersActuallyFound);
}
