/// <summary>
/// Called by the scheduler to remove the items that has expired
/// </summary>
public bool Expire()
{
//indicates whether some items expired during this interval or not...
bool expired = false;
//if user has updated the file then the new values will be reloaded.
_sleepInterval = ServiceConfiguration.ExpirationBulkRemoveDelay;
_removeThreshhold = ServiceConfiguration.ExpirationBulkRemoveSize;
//notification is sent for a max of 100k data if multiple items...
//otherwise if a single item is greater than 100k then notification is sent for
//that item only...
int notifThreshold = 30 * 1024;
CacheBase cacheInst = _context.CacheImpl;
CacheBase cache = _context.CacheInternal;
Cache rootCache = _context.CacheRoot;
object[] keys = null;
object[] values = null;
if (cache == null)
{
throw new InvalidOperationException("No cache instance defined");
}
bool allowExpire = AllowClusteredExpiry;
//in case of replication and por, only the coordinator/sub-coordinator is responsible to expire the items.
if (!allowExpire)
{
return(false);
}
ClusteredArrayList selectedKeys = new ClusteredArrayList();
ClusteredArrayList dependencyChangedSelectedKeys = new ClusteredArrayList();
int oldItemsCount = 0;
HashVector oldeItems = null;
try
{
StartLogging();
DateTime startTime = DateTime.Now;
int currentTime = AppUtil.DiffSeconds(startTime);
int cleanSize = (int)Math.Ceiling(cache.Count * _cleanRatio);
//set the flag that we are going to expire the items.
if (_cacheLastAccessLoggingIntervalPassed >= _cacheLastAccessLoggingInterval)
{
_cacheLastAccessLoggingInterval = CacheLastAccessLoggingInterval;
_cacheLastAccessCountEnabled = IsCacheLastAccessCountEnabled;
_cacheLastAccessCountLoggingEnabled = IsCacheLastAccessLoggingEnabled;
_cacheLastAccessInterval = CacheLastAccessCountInterval;
}
else
{
_cacheLastAccessLoggingIntervalPassed++;
}
if (_cacheLastAccessCountEnabled && _cacheLastAccessCountLoggingEnabled)
{
if (_cacheLastAccessLoggingIntervalPassed >= _cacheLastAccessLoggingInterval)
{
_cacheLastAccessLoggingIntervalPassed = 0;
oldeItems = new HashVector();
}
}
lock (_mainIndex.SyncRoot)
{
IDictionaryEnumerator em = _mainIndex.GetEnumerator(); //added by muds
if (em != null)
{
while (em.MoveNext())
{
ExpirationHint hint = em.Value as ExpirationHint;
if (hint != null)
{
if (hint.IsFromPool && !hint.PoolManager.IsUsingFakePools && !hint.IsOutOfPool)
{
continue;
}
if (_cacheLastAccessCountEnabled && hint is IdleExpiration)
{
IdleExpiration slidingExpHint = hint as IdleExpiration;
TimeSpan diff = AppUtil.GetDateTime(AppUtil.DiffSeconds(DateTime.Now)) - AppUtil.GetDateTime(slidingExpHint.LastAccessTime);
if (diff.TotalMinutes >= _cacheLastAccessInterval)
{
oldItemsCount++;
if (oldeItems != null)
{
oldeItems.Add(em.Key, null);
}
}
}
}
if (hint == null || hint.SortKey.CompareTo(currentTime) >= 0)
{
continue;
}
if (!allowExpire && hint.IsRoutable)
{
continue;
}
if (hint.DetermineExpiration(_context))
{
if (hint.GetExpiringHint() is FixedExpiration || hint.GetExpiringHint() is IdleExpiration)
{
selectedKeys.Add(em.Key);
}
else
{
dependencyChangedSelectedKeys.Add(em.Key);
}
if (cleanSize > 0 && selectedKeys.Count == cleanSize)
{
break;
}
}
}
}
}
if (NCacheLog.IsInfoEnabled)
{
NCacheLog.Info("ExpirationManager.Expire()", String.Format("Expiry time for {0}/{1} Items: " + (DateTime.UtcNow - startTime), selectedKeys.Count, /*_expiryIndex.KeyCount*/ cache.Count));
}
}
catch (Exception e)
{
NCacheLog.Error("ExpirationManager.Expire(bool)", "LocalCache(Expire): " + e.ToString());
}
finally
{
_context.PerfStatsColl.IncrementCacheLastAccessCountStats(oldItemsCount);
ApplyLoggs();
ClusteredArrayList dependentItems = new ClusteredArrayList();
ClusteredArrayList removedItems = new ClusteredArrayList();
DateTime startTime = DateTime.Now;
HashVector expiredItemTable = new HashVector();
expiredItemTable.Add(ItemRemoveReason.Expired, selectedKeys); //Time based expiration
expiredItemTable.Add(ItemRemoveReason.DependencyChanged, dependencyChangedSelectedKeys); //FileDependency or any other
try
{
IDictionaryEnumerator ide = expiredItemTable.GetEnumerator();
while (ide.MoveNext())
{
selectedKeys = ide.Value as ClusteredArrayList;
ItemRemoveReason removedReason = (ItemRemoveReason)ide.Key;
if (selectedKeys.Count > 0)
{
//new architectural changes begins from here.
ClusteredArrayList keysTobeRemoved = new ClusteredArrayList();
for (int i = 0; i < selectedKeys.Count && !_cacheCleared; i++)
{
keysTobeRemoved.Add(selectedKeys[i]);
if (keysTobeRemoved.Count % _removeThreshhold == 0)
{
try
{
if (this.IsDisposed)
{
break;
}
OperationContext operationContext = new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
operationContext.Add(OperationContextFieldName.RaiseCQNotification, true);
object[][] keysExposed = keysTobeRemoved.ToInternalArray();
foreach (object[] keyCollection in keysExposed)
{
ArrayList removed = cache.RemoveSync(keyCollection, removedReason, false, operationContext) as ArrayList;
if (removed != null)
{
removedItems.AddRange(removed);
}
}
//set the flag that item has expired from cache...
expired = true;
if (_context.PerfStatsColl != null)
{
_context.PerfStatsColl.IncrementExpiryPerSecStatsBy(keysTobeRemoved.Count);
}
}
catch (Exception e)
{
NCacheLog.Error("ExpiryManager.Expire", "an error occurred while removing expired items. Error " + e.ToString());
}
keysTobeRemoved.Clear();
if (removedItems != null && removedItems.Count > 0)
{
dependentItems.AddRange(removedItems);
removedItems.Clear();
}
//we stop the activity of the current thread so that normal user operation is not affected.
Thread.Sleep(_sleepInterval * 1000);
}
}
if (!this.IsDisposed && keysTobeRemoved.Count > 0)
{
try
{
OperationContext operationContext = new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
operationContext.Add(OperationContextFieldName.RaiseCQNotification, true);
object[][] keysExposed = keysTobeRemoved.ToInternalArray();
foreach (object[] keyCollection in keysExposed)
{
ArrayList removed = cache.RemoveSync(keyCollection, removedReason, false, operationContext) as ArrayList;
if (removed != null)
{
removedItems.AddRange(removed);
}
}
//set the flag that item has expired from cache...
expired = true;
if (_context.PerfStatsColl != null)
{
_context.PerfStatsColl.IncrementExpiryPerSecStatsBy(keysTobeRemoved.Count);
}
if (removedItems != null && removedItems.Count > 0)
{
dependentItems.AddRange(removedItems);
removedItems.Clear();
}
}
catch (Exception e)
{
NCacheLog.Error("ExpiryManager.Expire", "an error occurred while removing expired items. Error " + e.ToString());
}
}
}
}
if (!this.IsDisposed && dependentItems.Count > 0)
{
ClusteredArrayList removableList = new ClusteredArrayList();
if (rootCache != null)
{
foreach (object depenentItme in dependentItems)
{
if (depenentItme == null)
{
continue;
}
removableList.Add(depenentItme);
if (removableList.Count % 100 == 0)
{
try
{
if (this.IsDisposed)
{
break;
}
OperationContext operationContext = new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
operationContext.Add(OperationContextFieldName.RaiseCQNotification, true);
rootCache.CascadedRemove(removableList, ItemRemoveReason.DependencyChanged, true, operationContext);
if (_context.PerfStatsColl != null)
{
_context.PerfStatsColl.IncrementExpiryPerSecStatsBy(removableList.Count);
}
}
catch (Exception exc)
{
NCacheLog.Error("ExpiryManager.Expire", "an error occurred while removing dependent items. Error " + exc.ToString());
}
removableList.Clear();
}
}
if (!this.IsDisposed && removableList.Count > 0)
{
try
{
OperationContext operationContext = new OperationContext(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
operationContext.Add(OperationContextFieldName.RaiseCQNotification, true);
rootCache.CascadedRemove(removableList, ItemRemoveReason.DependencyChanged, true, operationContext);
if (_context.PerfStatsColl != null)
{
_context.PerfStatsColl.IncrementExpiryPerSecStatsBy(removableList.Count);
}
}
catch (Exception exc)
{
NCacheLog.Error("ExpiryManager.Expire", "an error occurred while removing dependent items. Error " + exc.ToString());
}
removableList.Clear();
}
}
}
}
finally
{
_transitoryIndex.Clear();
lock (this)
{
_cacheCleared = false;
}
if (oldeItems != null)
{
StringBuilder sb = new StringBuilder();
IDictionaryEnumerator ide = oldeItems.GetEnumerator();
int count = 1;
while (ide.MoveNext())
{
sb.Append(ide.Key + ", ");
if (count % 10 == 0)
{
sb.Append("\r\n");
count = 1;
}
else
{
count++;
}
}
NCacheLog.Info(sb.ToString().Trim());
}
}
}
return(expired);
}