private void CleanUpFields()
{
_logger.LogDebug("Searching for items to clean up.");
var currTickCount = Environment.TickCount;
var toRemove = Shield.InTransaction(() =>
_freshIndex
.Where(i => i.Item.RemovableSince.HasValue
? unchecked (currTickCount - i.Item.RemovableSince.Value) > Configuration.RemovableItemLingerMs
: i.Item.ExpiresInMs <= 0)
.Select(i => i.Item)
.ToArray());
_logger.LogDebug("Found {ToRemoveCount} items to clean up.", toRemove.Length);
Shield.InTransaction(() =>
{
foreach (var item in toRemove)
{
if (_local.TryGetValue(item.Key, out var mi) && mi == item)
{
if (item.RemovableSince.HasValue)
{
_local.Remove(item.Key);
}
else
{
Expire(item);
}
}
}
});
}
private TimerCallback GetDeletableTimerMethod()
{
var lockObj = new object();
return(_ =>
{
bool lockTaken = false;
try
{
Monitor.TryEnter(lockObj, ref lockTaken);
if (!lockTaken)
{
return;
}
var currTickCount = Environment.TickCount;
var toRemove = Shield.InTransaction(() =>
_freshIndex
.Where(i => i.Item.RemovableSince.HasValue
? unchecked (currTickCount - i.Item.RemovableSince.Value) > Configuration.RemovableItemLingerMs
: i.Item.ExpiresInMs <= 0)
.Select(i => i.Item)
.ToArray());
Shield.InTransaction(() =>
{
foreach (var item in toRemove)
{
if (_local.TryGetValue(item.Key, out var mi) && mi == item)
{
if (item.RemovableSince.HasValue)
{
_local.Remove(item.Key);
}
else
{
Expire(item);
}
}
}
});
}
catch (Exception ex)
{
RaiseError(new GossipBackendException("Unexpected error on deletable timer task.", ex));
}
finally
{
if (lockTaken)
{
Monitor.Exit(lockObj);
}
}
});
}
private static void DictionaryTest()
{
var dict = new ShieldedDictNc<int, Shielded<int>>();
var randomizr = new Random();
while (true)
{
var transactionCounter = 0;
var time = mtTest("dictionary", 10000, i =>
{
var rnd = randomizr.Next(10);
if (i % 2 == 0)
// adder task - 500 of these
return Task.Factory.StartNew(() =>
{
Shield.InTransaction(() =>
{
Interlocked.Increment(ref transactionCounter);
var v = dict.ContainsKey(rnd) ? dict[rnd] : null;
int? num = v != null ? (int?)v.Value : null;
Thread.Sleep(1);
if (v == null)
dict[rnd] = new Shielded<int>(1);
else if (v.Value == -1)
dict.Remove(rnd);
else
v.Modify((ref int a) => a = num.Value + 1);
}
);
},
TaskCreationOptions.LongRunning
);
else
// subtractor task - 500 of these
return Task.Factory.StartNew(() =>
{
Shield.InTransaction(() =>
{
Interlocked.Increment(ref transactionCounter);
var v = dict.ContainsKey(rnd) ? dict[rnd] : null;
int? num = v != null ? (int?)v.Value : null;
Thread.Sleep(1);
if (v == null)
dict[rnd] = new Shielded<int>(-1);
else if (v.Value == 1)
dict.Remove(rnd);
else
v.Modify((ref int a) => a = num.Value - 1);
}
);
},
TaskCreationOptions.LongRunning
);
});
var sum = Enumerable.Range(0, 10).Sum(n => dict.ContainsKey(n) ? dict[n] : 0);
var zeroes = Shield.InTransaction(() => dict.Any(kvp => kvp.Value == 0));
Console.WriteLine(" {0} ms with {1} iterations and sum {2}, {3}",
time, transactionCounter, sum, zeroes ? "with zeroes!" : "no zeroes.");
}
}
