private List <VirtualCacheBase> CreateVCs(int ThreadCount)
{
//VirtualCache.Persisted = true;
List <VirtualCacheBase> vcs = new List <VirtualCacheBase>();
// Use a profile that uses more resources to accomodate more data in-memory (faster!).
var profile = new Profile
{
MemoryLimitInPercent = 98,
MaxStoreCount = ThreadCount,
BTreeSlotLength = 250
};
for (int i = 0; i < ThreadCount; i++)
{
var vc = new VirtualCache(string.Format("MyCacheStore{0}", i), true, null, profile);
if (_logger == null)
{
_logger = vc.Logger;
_logger.LogLevel = Log.LogLevels.Verbose;
_logger.Information("Start of VirtualCache demo.");
}
vcs.Add(vc);
}
return(vcs);
}
private bool Populate(VirtualCache cache, bool slidingExpiration, int start)
{
var target = cache;
_logger.Information("{0}: Start of Populating target cache {1}.", DateTime.Now, target.Name);
try
{
// using a batch allows more efficient use of SOP data store so it can do bulk insert.
CacheKeyValue[] batch = new CacheKeyValue[5000];
var policy = new CacheItemPolicy()
{
SlidingExpiration = new TimeSpan(0, 15, 0)
};
for (int i = start; i < start + MaxCacheEntries; i++)
{
batch[i % batch.Length] = new CacheKeyValue()
{
Key = string.Format("Hello{0}", i),
Value = string.Format("Value{0}", i),
Policy = policy
};
if (i % batch.Length == batch.Length - 1)
{
target.SetValues(batch);
}
}
}
catch (Exception exc)
{
_logger.Fatal(exc, "{0}: Failed Populating target cache {1}.", DateTime.Now, target.Name);
return(false);
}
_logger.Information("{0}: End Populating target cache {1}.", DateTime.Now, target.Name);
return(true);
}
public void Run()
{
var ThreadCount = 5;
VirtualCache cache;
List <Action> actions = new List <Action>();
// Use a profile that uses more resources to accomodate more data in-memory (faster!).
var profile = new Profile
{
MemoryLimitInPercent = 99,
MaxStoreCount = 1,
BTreeSlotLength = 150
};
cache = new VirtualCache("MyCacheStore", true, null, profile);
if (_logger == null)
{
_logger = cache.Logger;
_logger.LogLevel = Log.LogLevels.Verbose;
_logger.Information("Start of VirtualCache multi-clients simulation demo.");
}
// create threads that will populate Virtual Cache and retrieve the items.
for (int i = 0; i < ThreadCount; i++)
{
var vcIndex = i;
actions.Add(() =>
{
if (Populate(cache, vcIndex % 2 == 0, vcIndex * MaxCacheEntries))
{
RetrieveAll(cache, vcIndex * MaxCacheEntries);
}
});
}
Console.WriteLine("Starting client simulation threads.");
List <Task> tasks = new List <Task>();
foreach (var a in actions)
{
var t = TaskRun(a);
if (t == null)
{
continue;
}
tasks.Add(t);
}
// wait until all threads are finished.
if (_threaded)
{
Task.WaitAll(tasks.ToArray());
}
Console.WriteLine("Before VirtualCache dispose.");
cache.Dispose();
Console.WriteLine("VirtualCache was disposed.");
Console.WriteLine("End of VirtualCache demo.");
Console.WriteLine("'Cached' & 'Accessed all' {0} records across {1} simulated clients.", MaxCacheEntries * ThreadCount, ThreadCount);
}
public void Run()
{
List <Action> actions = new List <Action>();
List <VirtualCacheBase> vcs = new List <VirtualCacheBase>();
// create threads that will populate Virtual Cache and retrieve the items.
for (int i = 0; i < ThreadCount; i++)
{
// Set "isPersisted" flag true if wanting to persist cached data across runs.
// Non-persisted run (default) causes VirtualCache to be used as memory extender
// utilizing disk for extending cached data capacity beyond what can fit in memory to
// what Disk can accomodate.
var vc = new VirtualCache(string.Format("MyCacheStore{0}", i), true);
if (_logger == null)
{
_logger = vc.Logger;
_logger.LogLevel = Log.LogLevels.Verbose;
_logger.Information("Start of VirtualCache demo.");
}
// function to execute by the thread.
actions.Add(() =>
{
Populate(vc, i % 2 == 0);
RetrieveAll(vc);
var name = vc.Name;
vc.Dispose();
Console.WriteLine("VirtualCache {0} was disposed.", name);
});
vcs.Add(vc);
}
List <Task> tasks = new List <Task>();
// launch or start the threads all at once.
foreach (var a in actions)
{
var t = TaskRun(a);
if (t == null)
{
continue;
}
tasks.Add(t);
}
// wait until all threads are finished.
if (_threaded)
{
Task.WaitAll(tasks.ToArray());
}
Console.WriteLine("End of VirtualCache demo.");
}
private bool RetrieveAll(VirtualCache cache, int start)
{
var source = cache;
_logger.Information("{0}: Start of RetrieveAll cache entries from {1}.", DateTime.Now, source.Name);
try
{
for (int i = start; i < start + MaxCacheEntries; i++)
{
if ((string)source[string.Format("Hello{0}", i)] == null)
{
Console.WriteLine("Entry {0} was not found in cache {1}, 'it could have expired and got evicted.", string.Format("Hello{0}", i), source.Name);
}
}
}
catch (Exception exc)
{
_logger.Fatal(exc, "{0}: Failed Retrieving items from target cache {1}.", DateTime.Now, source.Name);
return(false);
}
_logger.Information("{0}: End of RetrieveAll cache entries from {1}.", DateTime.Now, source.Name);
return(true);
}
/// <summary>
/// Sample code that uses this VirtualCache.
/// </summary>
public static void Run()
{
Console.WriteLine("{0}: Virtual Cache demo started...", DateTime.Now);
VirtualCache.ServerPath = "SopBin\\";
VirtualCache vc = new VirtualCache();
ISortedDictionaryOnDisk cache1 = vc.GetObjectCache(1);
const int MaxCount = 40000;
for (int i = 0; i < MaxCount; i++)
cache1.Add(i, string.Format("{0} cached data", i));
Console.WriteLine("{0}: Finished inserting {1} records, reading 'em starts now...", DateTime.Now, MaxCount);
cache1.MoveFirst();
cache1.HintSequentialRead = true;
for (int i = 0; i < MaxCount; i++)
{
string s = cache1.CurrentValue as string;
if (string.IsNullOrEmpty(s) ||
s != string.Format("{0} cached data", i))
Console.WriteLine("Error, data not found.");
cache1.MoveNext();
}
Console.WriteLine("{0}: Virtual Cache demo ended... {1} records were read.", DateTime.Now, MaxCount);
}
