public object GetValue(string key, Func <string, Tuple <object, TimeSpan> > valueCreator)
{
if (valueCreator == null)
{
return(_innerCache.Get(key));
}
var result = valueCreator(key);
#if !CORE_CLR
return(_innerCache.AddOrGetExisting(key, result.Item1, new System.Runtime.Caching.CacheItemPolicy()
{
SlidingExpiration = result.Item2,
RemovedCallback = this.OnRemovedCallback,
}));
#else
if (!this.Exists(key))
{
var options = new MemoryCacheEntryOptions();
options.SlidingExpiration = result.Item2;
options.RegisterPostEvictionCallback(this.OnPostEvictionCallback);
return(_innerCache.Set(key, result.Item1, options));
}
else
{
return(_innerCache.Get(key));
}
#endif
}
public object GetValue(string key, Func <string, Tuple <object, TimeSpan> > valueCreator)
{
if (valueCreator == null)
{
return(_innerCache.Get(key));
}
var result = valueCreator(key);
return(_innerCache.AddOrGetExisting(key, result.Item1, new System.Runtime.Caching.CacheItemPolicy()
{
SlidingExpiration = result.Item2,
//UpdateCallback = this.OnUpdateCallback,
RemovedCallback = this.OnRemovedCallback,
}));
}
/// <inheritdoc />
public T AddOrGetExisting <T>(string key, Func <T> factory, TimeSpan?lifeSpan)
{
var objectToAdd = factory();
var cacheItemExpiryDate = GetCacheItemExpiryDate(lifeSpan);
var result = cache.AddOrGetExisting(key, objectToAdd, cacheItemExpiryDate) ?? objectToAdd;
return((T)result);
}
public static T GetOrSet <T>(string key, Func <T> valueFactory, TimeSpan expiry)
{
try
{
var newValue = new Lazy <T>(valueFactory);
var oldValue = _memorycache.AddOrGetExisting(key, newValue, DateTimeOffset.UtcNow.Add(expiry)) as Lazy <T>;
return((oldValue ?? newValue).Value);
}
catch
{
_memorycache.Remove(key);
return(default(T));
}
}
private async Task <T> GetOrSetMemory <T>(string key, TimeSpan timespan, Func <Task <T> > valueFactory)
{
var newValue = new Lazy <Task <T> >(valueFactory);
var oldValue = _memorycache.AddOrGetExisting(key, newValue, DateTimeOffset.UtcNow.Add(timespan)) as Lazy <Task <T> >;
try
{
return(await(oldValue ?? newValue).Value.ConfigureAwait(false));
}
catch
{
_memorycache.Remove(key);
return(default(T));
}
}
public object GetValue(string key, Func <string, CacheEntry> valueCreator)
{
if (valueCreator == null)
{
return(_innerCache.Get(key));
}
var entry = valueCreator(key);
return(_innerCache.AddOrGetExisting(key, entry.Value, new System.Runtime.Caching.CacheItemPolicy()
{
SlidingExpiration = entry.Expiry ?? System.Runtime.Caching.ObjectCache.NoSlidingExpiration,
//UpdateCallback = this.OnUpdateCallback,
RemovedCallback = this.OnRemovedCallback,
}));
}
public override void Run()
{
Console.WriteLine();
Console.WriteLine("Preparing raw data...");
var random = new Random(DateTime.Now.Millisecond);
var access = new int[RandomAccessCount];
var data = new Datum[TOTAL_DATUM_COUNT];
for (var d = 0; d < data.Length; d++)
{
data[d] =
new Datum
{
Id = d + 1,
SomePayload = Enumerable.Range(0, 26).Aggregate(new StringBuilder(), (sb, i) => sb.Append('A' + random.Next(26))).ToString()
};
}
// To be fair, we will access each caching facility with the exact same sequence (of length RandomAccessCount)
// of datum indices (picked randomly in the range 0...TOTAL_DATUM_COUNT - 1, inclusive)
// (Depending on the ratio RANDOM_ACCESS_COUNT / TOTAL_DATUM_COUNT,
// some indices in the range 0...TOTAL_DATUM_COUNT - 1 may or may not ever be returned by the below random.Next(...))
for (var a = 0; a < access.Length; a++)
{
access[a] = random.Next(TOTAL_DATUM_COUNT);
}
Console.WriteLine();
Console.WriteLine("... raw data prepared.");
Console.WriteLine();
Console.WriteLine("Preparing caches...");
var accessPercent = RandomAccessCount / 100;
IMemoryCache <int, Datum> ourMemCache = new MemoryCache <int, Datum>(TOTAL_DATUM_COUNT / 5);
ourMemCache.SetPolicy(typeof(MruEvictionPolicy <,>));
using (var msMemCache = new System.Runtime.Caching.MemoryCache("System.Runtime.Caching.MemoryCache"))
{
var msPolicy = new System.Runtime.Caching.CacheItemPolicy();
msPolicy.Priority = System.Runtime.Caching.CacheItemPriority.Default;
Console.WriteLine();
Console.WriteLine("... caches prepared.");
Console.WriteLine();
Console.WriteLine("Press ESC to skip, or any other key to start stressing .NET's memory cache.");
if (Console.ReadKey().KeyChar != 27)
{
Console.Clear();
Console.WriteLine();
Console.WriteLine("About to stress Microsoft's {0}...", typeof(System.Runtime.Caching.MemoryCache).FullName);
Console.WriteLine();
Console.WriteLine("Total datum count : {0}", TOTAL_DATUM_COUNT.ToString("0,0"));
Console.WriteLine();
Console.WriteLine("Number of random accesses to perform : {0}", RandomAccessCount.ToString("0,0"));
Console.WriteLine();
Console.WriteLine("Press any key (and hang on)...");
Console.WriteLine();
Console.ReadKey();
Console.WriteLine("Time... {0}", DateTime.Now.ToString("HH:mm:ss.fff"));
Console.WriteLine();
var time1 = Time.Start();
var period1 = 0d;
for (var a = 0; a < access.Length; a++)
{
var index = access[a];
var datum = data[index];
var item = (Datum)msMemCache.AddOrGetExisting(datum.Id.ToString(), datum, msPolicy) ?? datum;
if (item.Id != datum.Id || item.SomePayload != datum.SomePayload)
{
throw new Exception("Ouch. Unexpected item.");
}
if (a % accessPercent == 0)
{
Console.Write(".");
}
}
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("Time... {0}", DateTime.Now.ToString("HH:mm:ss.fff"));
Console.WriteLine();
Console.WriteLine("Elapsed: {0} ms", (period1 = time1.ElapsedMilliseconds).ToString("0,0"));
Console.WriteLine("Latency: {0} ms (avg.)", period1 / RandomAccessCount);
}
}
GC.Collect();
Console.WriteLine();
Console.WriteLine("Press ESC to skip, or any other key to start stressing our memory cache.");
if (Console.ReadKey().KeyChar != 27)
{
Console.Clear();
Console.WriteLine();
Console.WriteLine("About to stress our System.Runtime.Caching.Generic.MemoryCache...");
Console.WriteLine();
Console.WriteLine("Total datum count : {0}", TOTAL_DATUM_COUNT.ToString("0,0"));
Console.WriteLine();
Console.WriteLine("Number of random accesses to perform : {0}", RandomAccessCount.ToString("0,0"));
Console.WriteLine();
Console.WriteLine("Press any key (and hang on)...");
Console.WriteLine();
Console.WriteLine("(# of cache evictions shown in parentheses)...");
Console.WriteLine();
Console.ReadKey();
Console.WriteLine("Time... {0}", DateTime.Now.ToString("HH:mm:ss.fff"));
Console.WriteLine();
var evictedCount = 0;
ourMemCache.Policy.OnEvict =
delegate(IManagedCache <int, Datum> source, int key, Datum value, EvictionReason reason)
{
evictedCount++;
};
var time2 = Time.Start();
var period2 = 0d;
var misses = 0;
for (var a = 0; a < access.Length; a++)
{
var index = access[a];
var datum = data[index];
var item = ourMemCache.GetOrAdd(datum.Id, (Func <object, Datum>) delegate(object context) { misses++; return(datum); });
if (item.Id != datum.Id || item.SomePayload != datum.SomePayload)
{
throw new Exception("Ouch. Unexpected item.");
}
if (a % accessPercent == 0)
{
Console.Write("({0})", evictedCount);
evictedCount = 0;
}
}
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("Time... {0}", DateTime.Now.ToString("HH:mm:ss.fff"));
Console.WriteLine();
Console.WriteLine("Elapsed: {0} ms", (period2 = time2.ElapsedMilliseconds).ToString("0,0"));
Console.WriteLine("Latency: {0} ms (avg.)", period2 / RandomAccessCount);
Console.WriteLine("Initial cache capacity: {0}", ourMemCache.Capacity.ToString("0,0"));
Console.WriteLine("Final cache size: {0}", ourMemCache.Count.ToString("0,0"));
Console.WriteLine("No. cache misses: {0}", misses.ToString("0,0"));
Console.WriteLine("Cache fill ratio: {0}%", (100 * ourMemCache.Count / ourMemCache.Capacity).ToString(".00"));
}
}
public override void Run()
{
Console.WriteLine();
Console.WriteLine("Preparing raw data...");
var random = new Random(DateTime.Now.Millisecond);
var access = new int[RandomAccessCount];
var data = new Datum[TOTAL_DATUM_COUNT];
for (var d = 0; d < data.Length; d++)
{
data[d] =
new Datum
{
Id = d + 1,
SomePayload = Enumerable.Range(0, 26).Aggregate(new StringBuilder(), (sb, i) => sb.Append('A' + random.Next(26))).ToString()
};
}
// To be fair, we will access each caching facility with the exact same sequence (of length RandomAccessCount)
// of datum indices (picked randomly in the range 0...TOTAL_DATUM_COUNT - 1, inclusive)
// (Depending on the ratio RANDOM_ACCESS_COUNT / TOTAL_DATUM_COUNT,
// some indices in the range 0...TOTAL_DATUM_COUNT - 1 may or may not ever be returned by the below random.Next(...))
for (var a = 0; a < access.Length; a++)
{
access[a] = random.Next(TOTAL_DATUM_COUNT);
}
Console.WriteLine();
Console.WriteLine("... raw data prepared.");
Console.WriteLine();
Console.WriteLine("Preparing caches...");
var accessPercent = RandomAccessCount / 100;
IMemoryCache<int, Datum> ourMemCache = new MemoryCache<int, Datum>(TOTAL_DATUM_COUNT / 5);
ourMemCache.SetPolicy(typeof(MruEvictionPolicy<,>));
using (var msMemCache = new System.Runtime.Caching.MemoryCache("System.Runtime.Caching.MemoryCache"))
{
var msPolicy = new System.Runtime.Caching.CacheItemPolicy();
msPolicy.Priority = System.Runtime.Caching.CacheItemPriority.Default;
Console.WriteLine();
Console.WriteLine("... caches prepared.");
Console.WriteLine();
Console.WriteLine("Press ESC to skip, or any other key to start stressing .NET's memory cache.");
if (Console.ReadKey().KeyChar != 27)
{
Console.Clear();
Console.WriteLine();
Console.WriteLine("About to stress Microsoft's {0}...", typeof(System.Runtime.Caching.MemoryCache).FullName);
Console.WriteLine();
Console.WriteLine("Total datum count : {0}", TOTAL_DATUM_COUNT.ToString("0,0"));
Console.WriteLine();
Console.WriteLine("Number of random accesses to perform : {0}", RandomAccessCount.ToString("0,0"));
Console.WriteLine();
Console.WriteLine("Press any key (and hang on)...");
Console.WriteLine();
Console.ReadKey();
Console.WriteLine("Time... {0}", DateTime.Now.ToString("HH:mm:ss.fff"));
Console.WriteLine();
var time1 = Time.Start();
var period1 = 0d;
for (var a = 0; a < access.Length; a++)
{
var index = access[a];
var datum = data[index];
var item = (Datum)msMemCache.AddOrGetExisting(datum.Id.ToString(), datum, msPolicy) ?? datum;
if (item.Id != datum.Id || item.SomePayload != datum.SomePayload)
{
throw new Exception("Ouch. Unexpected item.");
}
if (a % accessPercent == 0)
{
Console.Write(".");
}
}
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("Time... {0}", DateTime.Now.ToString("HH:mm:ss.fff"));
Console.WriteLine();
Console.WriteLine("Elapsed: {0} ms", (period1 = time1.ElapsedMilliseconds).ToString("0,0"));
Console.WriteLine("Latency: {0} ms (avg.)", period1 / RandomAccessCount);
}
}
GC.Collect();
Console.WriteLine();
Console.WriteLine("Press ESC to skip, or any other key to start stressing our memory cache.");
if (Console.ReadKey().KeyChar != 27)
{
Console.Clear();
Console.WriteLine();
Console.WriteLine("About to stress our System.Runtime.Caching.Generic.MemoryCache...");
Console.WriteLine();
Console.WriteLine("Total datum count : {0}", TOTAL_DATUM_COUNT.ToString("0,0"));
Console.WriteLine();
Console.WriteLine("Number of random accesses to perform : {0}", RandomAccessCount.ToString("0,0"));
Console.WriteLine();
Console.WriteLine("Press any key (and hang on)...");
Console.WriteLine();
Console.WriteLine("(# of cache evictions shown in parentheses)...");
Console.WriteLine();
Console.ReadKey();
Console.WriteLine("Time... {0}", DateTime.Now.ToString("HH:mm:ss.fff"));
Console.WriteLine();
var evictedCount = 0;
ourMemCache.Policy.OnEvict =
delegate(IManagedCache<int, Datum> source, int key, Datum value, EvictionReason reason)
{
evictedCount++;
};
var time2 = Time.Start();
var period2 = 0d;
var misses = 0;
for (var a = 0; a < access.Length; a++)
{
var index = access[a];
var datum = data[index];
var item = ourMemCache.GetOrAdd(datum.Id, (Func<object, Datum>)delegate(object context) { misses++; return datum; });
if (item.Id != datum.Id || item.SomePayload != datum.SomePayload)
{
throw new Exception("Ouch. Unexpected item.");
}
if (a % accessPercent == 0)
{
Console.Write("({0})", evictedCount);
evictedCount = 0;
}
}
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("Time... {0}", DateTime.Now.ToString("HH:mm:ss.fff"));
Console.WriteLine();
Console.WriteLine("Elapsed: {0} ms", (period2 = time2.ElapsedMilliseconds).ToString("0,0"));
Console.WriteLine("Latency: {0} ms (avg.)", period2 / RandomAccessCount);
Console.WriteLine("Initial cache capacity: {0}", ourMemCache.Capacity.ToString("0,0"));
Console.WriteLine("Final cache size: {0}", ourMemCache.Count.ToString("0,0"));
Console.WriteLine("No. cache misses: {0}", misses.ToString("0,0"));
Console.WriteLine("Cache fill ratio: {0}%", (100 * ourMemCache.Count / ourMemCache.Capacity).ToString(".00"));
}
}
