protected override void Run()
{
while (router.Running)
{
// Run through all cache entries and do the following:
// 1. If the entry is not expired, skip it
// 2. If the entry is expired and was not accessed in the last time interval -- throw it away
// 3. If the entry is expired and was accessed in the last time interval, put into "fetch-batch-requests" list
// At the end of the process, fetch batch requests for entries that need to be refreshed
// Upon receiving refreshing answers, if the entry was not changed, double its expiration timer.
// If it was changed, update the cache and reset the expiration timer.
// this dictionary holds a map between a silo address and the list of grains that need to be refreshed
var fetchInBatchList = new Dictionary <SiloAddress, List <GrainId> >();
// get the list of cached grains
// for debug only
int cnt1 = 0, cnt2 = 0, cnt3 = 0, cnt4 = 0;
// run through all cache entries
var enumerator = cache.GetStoredEntries();
while (enumerator.MoveNext())
{
var pair = enumerator.Current;
GrainId grain = pair.Key;
var entry = pair.Value;
SiloAddress owner = router.CalculateGrainDirectoryPartition(grain);
if (owner == null) // Null means there's no other silo and we're shutting down, so skip this entry
{
continue;
}
if (owner.Equals(router.MyAddress))
{
// we found our owned entry in the cache -- it is not supposed to happen unless there were
// changes in the membership
Log.Warn(ErrorCode.Runtime_Error_100185, "Grain {grain} owned by {owner} was found in the cache of {owner}", grain, owner, owner);
cache.Remove(grain);
cnt1++; // for debug
}
else
{
if (entry == null)
{
// 0. If the entry was deleted in parallel, presumably due to cleanup after silo death
cache.Remove(grain); // for debug
cnt3++;
}
else if (!entry.IsExpired())
{
// 1. If the entry is not expired, skip it
cnt2++; // for debug
}
else if (entry.NumAccesses == 0)
{
// 2. If the entry is expired and was not accessed in the last time interval -- throw it away
cache.Remove(grain); // for debug
cnt3++;
}
else
{
// 3. If the entry is expired and was accessed in the last time interval, put into "fetch-batch-requests" list
if (!fetchInBatchList.ContainsKey(owner))
{
fetchInBatchList[owner] = new List <GrainId>();
}
fetchInBatchList[owner].Add(grain);
// And reset the entry's access count for next time
entry.NumAccesses = 0;
cnt4++; // for debug
}
}
}
if (Log.IsEnabled(LogLevel.Trace))
{
Log.Trace("Silo {0} self-owned (and removed) {1}, kept {2}, removed {3} and tries to refresh {4} grains", router.MyAddress, cnt1, cnt2, cnt3, cnt4);
}
// send batch requests
SendBatchCacheRefreshRequests(fetchInBatchList);
ProduceStats();
// recheck every X seconds (Consider making it a configurable parameter)
Thread.Sleep(SLEEP_TIME_BETWEEN_REFRESHES);
}
}
protected override async Task Run()
{
while (router.Running)
{
// Run through all cache entries and do the following:
// 1. If the entry is not expired, skip it
// 2. If the entry is expired and was not accessed in the last time interval -- throw it away
// 3. If the entry is expired and was accessed in the last time interval, put into "fetch-batch-requests" list
// At the end of the process, fetch batch requests for entries that need to be refreshed
// Upon receiving refreshing answers, if the entry was not changed, double its expiration timer.
// If it was changed, update the cache and reset the expiration timer.
// this dictionary holds a map between a silo address and the list of grains that need to be refreshed
var fetchInBatchList = new Dictionary <SiloAddress, List <GrainId> >();
// get the list of cached grains
// for debug only
int cnt1 = 0, cnt2 = 0, cnt3 = 0, cnt4 = 0;
// run through all cache entries
var enumerator = cache.GetStoredEntries();
while (enumerator.MoveNext())
{
var pair = enumerator.Current;
GrainId grain = pair.Key;
var entry = pair.Value;
SiloAddress owner = router.CalculateGrainDirectoryPartition(grain);
if (owner == null) // Null means there's no other silo and we're shutting down, so skip this entry
{
continue;
}
if (entry == null)
{
// 0. If the entry was deleted in parallel, presumably due to cleanup after silo death
cache.Remove(grain); // for debug
cnt3++;
}
else if (!entry.IsExpired())
{
// 1. If the entry is not expired, skip it
cnt2++; // for debug
}
else if (entry.NumAccesses == 0)
{
// 2. If the entry is expired and was not accessed in the last time interval -- throw it away
cache.Remove(grain); // for debug
cnt3++;
}
else
{
// 3. If the entry is expired and was accessed in the last time interval, put into "fetch-batch-requests" list
if (!fetchInBatchList.TryGetValue(owner, out var list))
{
fetchInBatchList[owner] = list = new List <GrainId>();
}
list.Add(grain);
// And reset the entry's access count for next time
entry.NumAccesses = 0;
cnt4++; // for debug
}
}
if (Log.IsEnabled(LogLevel.Trace))
{
Log.LogTrace(
"Silo {SiloAddress} self-owned (and removed) {OwnedAndRemovedCount}, kept {KeptCount}, removed {RemovedCount} and tried to refresh {RefreshedCount} grains",
router.MyAddress,
cnt1,
cnt2,
cnt3,
cnt4);
}
// send batch requests
SendBatchCacheRefreshRequests(fetchInBatchList);
ProduceStats();
// recheck every X seconds (Consider making it a configurable parameter)
await Task.Delay(SLEEP_TIME_BETWEEN_REFRESHES);
}
}
