public async Task CacheManager_Stats_Threaded <T>(T cache)
where T : ICacheManager <object>
{
var puts = cache.CacheHandles.Select(p => p.Stats.GetStatistic(CacheStatsCounterType.PutCalls));
var adds = cache.CacheHandles.Select(p => p.Stats.GetStatistic(CacheStatsCounterType.AddCalls));
var threads = 4;
var iterations = 10;
var putCounter = 0;
using (cache)
{
var key = Guid.NewGuid().ToString();
await ThreadTestHelper.RunAsync(
async() =>
{
cache.Add(key, "hi");
cache.Put(key, "changed");
Interlocked.Increment(ref putCounter);
await Task.Delay(0);
},
threads,
iterations);
}
await Task.Delay(20);
putCounter.Should().Be(threads * iterations);
puts.ShouldAllBeEquivalentTo(
Enumerable.Repeat(threads * iterations, cache.CacheHandles.Count()));
}
public async Task Redis_NoRaceCondition_WithUpdate()
{
using (var cache = CacheFactory.Build <RaceConditionTestElement>(settings =>
{
settings.WithMaxRetries(int.MaxValue);
settings.WithUpdateMode(CacheUpdateMode.Up)
.WithJsonSerializer()
.WithRedisCacheHandle("default")
.WithExpiration(ExpirationMode.Absolute, TimeSpan.FromMinutes(20));
settings.WithRedisConfiguration("default", config =>
{
config.WithAllowAdmin()
.WithDatabase(7)
.WithEndpoint("127.0.0.1", 6379);
});
}))
{
var key = Guid.NewGuid().ToString();
cache.Remove(key);
cache.Add(key, new RaceConditionTestElement()
{
Counter = 0
});
int numThreads = 5;
int iterations = 10;
int numInnerIterations = 10;
int countCasModifyCalls = 0;
// act
await ThreadTestHelper.RunAsync(
async() =>
{
for (int i = 0; i < numInnerIterations; i++)
{
cache.Update(
key,
(value) =>
{
value.Counter++;
Interlocked.Increment(ref countCasModifyCalls);
return(value);
},
int.MaxValue);
await Task.Delay(0);
}
},
numThreads,
iterations);
// assert
await Task.Delay(100);
var result = cache.Get(key);
result.Should().NotBeNull();
result.Counter.Should().Be(numThreads * numInnerIterations * iterations, "counter should be exactly the expected value");
countCasModifyCalls.Should().BeGreaterThan((int)result.Counter, "we expect many version collisions, so cas calls should be way higher then the count result");
}
}
public async Task Memcached_NoRaceCondition_WithCasButTooFiewRetries()
{
// arrange
using (var cache = CacheFactory.FromConfiguration <RaceConditionTestElement>(
TestManagers.BaseConfiguration.Builder
.WithUpdateMode(CacheUpdateMode.Up)
.WithMemcachedCacheHandle(Configuration)
.WithExpiration(ExpirationMode.Absolute, TimeSpan.FromHours(10))
.Build()))
{
cache.Remove("myCounter");
cache.Add("myCounter", new RaceConditionTestElement()
{
Counter = 0
});
int numThreads = 5;
int iterations = 10;
int numInnerIterations = 10;
int countCasModifyCalls = 0;
int retries = 0;
// act
await ThreadTestHelper.RunAsync(
async() =>
{
for (int i = 0; i < numInnerIterations; i++)
{
RaceConditionTestElement newValue;
cache.TryUpdate(
"myCounter",
(value) =>
{
value.Counter++;
Interlocked.Increment(ref countCasModifyCalls);
return(value);
},
retries,
out newValue);
}
await Task.Delay(10);
},
numThreads,
iterations);
// assert
var result = cache.Get("myCounter");
result.Should().NotBeNull();
Trace.TraceInformation("Counter increased to " + result.Counter + " cas calls needed " + countCasModifyCalls);
result.Counter.Should().BeLessThan(
numThreads * numInnerIterations * iterations,
"counter should NOT be exactly the expected value");
countCasModifyCalls.Should().Be(
numThreads * numInnerIterations * iterations,
"with one try, we exactly one update call per iteration");
}
}
public async Task Memcached_NoRaceCondition_WithCasHandling()
{
// arrange
using (var cache = CacheFactory.FromConfiguration <RaceConditionTestElement>(
TestManagers.BaseConfiguration.Builder
.WithMaxRetries(int.MaxValue)
.WithSystemRuntimeCacheHandle()
.WithExpiration(ExpirationMode.Absolute, TimeSpan.FromMilliseconds(1))
.And
.WithMemcachedCacheHandle(Configuration)
.WithExpiration(ExpirationMode.Absolute, TimeSpan.FromSeconds(60))
.Build()))
{
var key = Guid.NewGuid().ToString();
cache.Remove(key);
cache.Add(key, new RaceConditionTestElement()
{
Counter = 0
}).Should().BeTrue();
int numThreads = 5;
int iterations = 10;
int numInnerIterations = 10;
int countCasModifyCalls = 0;
// act
await ThreadTestHelper.RunAsync(
async() =>
{
for (int i = 0; i < numInnerIterations; i++)
{
cache.Update(
key,
(value) =>
{
value.Counter++;
Interlocked.Increment(ref countCasModifyCalls);
return(value);
});
}
await Task.Delay(10);
},
numThreads,
iterations);
// assert
var result = cache.Get(key);
result.Should().NotBeNull();
Trace.WriteLine("Counter increased to " + result.Counter + " cas calls needed " + countCasModifyCalls);
result.Counter.Should().Be(numThreads * numInnerIterations * iterations, "counter should be exactly the expected value");
countCasModifyCalls.Should().BeGreaterThan((int)result.Counter, "we expect many version collisions, so cas calls should be way higher then the count result");
}
}
public async Task Redis_RaceCondition_WithoutUpdate()
{
using (var cache = CacheFactory.Build <RaceConditionTestElement>(settings =>
{
settings.WithUpdateMode(CacheUpdateMode.Up)
.WithJsonSerializer()
.WithRedisCacheHandle("default")
.WithExpiration(ExpirationMode.Absolute, TimeSpan.FromMinutes(20));
settings.WithRedisConfiguration("default", config =>
{
config.WithAllowAdmin()
.WithDatabase(8)
.WithEndpoint("127.0.0.1", 6379);
});
}))
{
var key = Guid.NewGuid().ToString();
cache.Add(key, new RaceConditionTestElement()
{
Counter = 0
});
int numThreads = 5;
int iterations = 10;
int numInnerIterations = 10;
// act
await ThreadTestHelper.RunAsync(
async() =>
{
for (int i = 0; i < numInnerIterations; i++)
{
var val = cache.Get(key);
val.Should().NotBeNull();
val.Counter++;
cache.Put(key, val);
await Task.Delay(1);
}
},
numThreads,
iterations);
// assert
await Task.Delay(10);
var result = cache.Get(key);
result.Should().NotBeNull();
result.Counter.Should().NotBe(numThreads * numInnerIterations * iterations);
}
}
public async Task Memcached_RaceCondition_WithoutCasHandling()
{
// arrange
using (var cache = CacheFactory.FromConfiguration <RaceConditionTestElement>(
TestManagers.BaseConfiguration.Builder
.WithUpdateMode(CacheUpdateMode.Up)
.WithMemcachedCacheHandle(Configuration)
.WithExpiration(ExpirationMode.Absolute, TimeSpan.FromMinutes(20))
.Build()))
{
var key = Guid.NewGuid().ToString();
cache.Remove(key);
cache.Add(key, new RaceConditionTestElement()
{
Counter = 0
});
int numThreads = 5;
int iterations = 10;
int numInnerIterations = 10;
// act
await ThreadTestHelper.RunAsync(
async() =>
{
for (int i = 0; i < numInnerIterations; i++)
{
var val = cache.Get(key);
val.Should().NotBeNull();
val.Counter++;
cache.Put(key, val);
}
await Task.Delay(10);
},
numThreads,
iterations);
// assert
var result = cache.Get(key);
result.Should().NotBeNull();
Trace.TraceInformation("Counter increased to " + result.Counter);
result.Counter.Should().NotBe(numThreads * numInnerIterations * iterations);
}
}
public async Task Thread_Update(ICacheManager <object> cache)
{
using (cache)
{
var key = Guid.NewGuid().ToString();
var handleInfo = string.Join("\nh: ", cache.CacheHandles.Select(p => p.Configuration.Name + ":" + p.GetType().Name));
cache.Remove(key);
cache.Add(key, new RaceConditionTestElement()
{
Counter = 0
});
int numThreads = 5;
int iterations = 10;
int numInnerIterations = 10;
int countCasModifyCalls = 0;
// act
await ThreadTestHelper.RunAsync(
async() =>
{
for (int i = 0; i < numInnerIterations; i++)
{
cache.Update(
key,
(value) =>
{
var val = value as RaceConditionTestElement;
if (val == null)
{
throw new InvalidOperationException("WTF invalid object result");
}
val.Counter++;
Interlocked.Increment(ref countCasModifyCalls);
return(value);
},
int.MaxValue);
}
await Task.Delay(0);
},
numThreads,
iterations);
// assert
await Task.Delay(10);
for (var i = 0; i < cache.CacheHandles.Count(); i++)
{
var handle = cache.CacheHandles.ElementAt(i);
var result = (RaceConditionTestElement)handle.Get(key);
if (i < cache.CacheHandles.Count() - 1)
{
// only the last one should have the item
result.Should().BeNull();
}
else
{
result.Should().NotBeNull(handleInfo + "\ncurrent: " + handle.Configuration.Name + ":" + handle.GetType().Name);
result.Counter.Should().Be(numThreads * numInnerIterations * iterations, handleInfo + "\ncounter should be exactly the expected value.");
countCasModifyCalls.Should().BeGreaterOrEqualTo((int)result.Counter, handleInfo + "\nexpecting no (if synced) or some version collisions.");
}
}
}
}
