public override void GetKeyList(int bucketId, bool startLogging, out ClusteredArrayList keyList)
{
if (startLogging)
_logMgr.StartLogging(bucketId, LogMode.LogBeforeAfterActualOperation);
keyList = new ClusteredArrayList();
if (_keyList != null)
{
if (_keyList.Contains(bucketId))
{
HashVector keyTbl = _keyList[bucketId] as HashVector;
keyList.AddRange(keyTbl.Keys);
}
}
}
void IEvictionPolicy.Execute(CacheBase cache, CacheRuntimeContext context, long evictSize)
{
ILogger NCacheLog = cache.Context.NCacheLog;
if (NCacheLog.IsInfoEnabled) NCacheLog.Info("LocalCache.Evict()", "Cache Size: {0}" + cache.Count.ToString());
//if user has updated the values in configuration file then new values will be reloaded.
_sleepInterval = Convert.ToInt32(ServiceConfiguration.EvictionBulkRemoveDelay);
_removeThreshhold = Convert.ToInt32(ServiceConfiguration.EvictionBulkRemoveSize);
DateTime startTime = DateTime.Now;
IList selectedKeys = this.GetSelectedKeys(cache, (long)Math.Ceiling(evictSize * _ratio));
DateTime endTime = DateTime.Now;
if (NCacheLog.IsInfoEnabled) NCacheLog.Info("LocalCache.Evict()", String.Format("Time Span for {0} Items: " + (endTime - startTime), selectedKeys.Count));
startTime = DateTime.Now;
Cache rootCache = context.CacheRoot;
ClusteredArrayList keysTobeRemoved = new ClusteredArrayList();
ClusteredArrayList dependentItems = new ClusteredArrayList();
IList removedItems = null;
IEnumerator e = selectedKeys.GetEnumerator();
int removedThreshhold = _removeThreshhold/300;
int remIteration = 0;
while (e.MoveNext())
{
object key = e.Current;
if (key == null) continue;
keysTobeRemoved.Add(key);
if (keysTobeRemoved.Count % 300 == 0)
{
try
{
OperationContext priorityEvictionOperationContext = new OperationContext();
priorityEvictionOperationContext.Add(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
removedItems = cache.RemoveSync(keysTobeRemoved.ToArray(), ItemRemoveReason.Underused, false, priorityEvictionOperationContext) as ArrayList;
context.PerfStatsColl.IncrementEvictPerSecStatsBy(keysTobeRemoved.Count);
}
catch (Exception ex)
{
NCacheLog.Error("PriorityEvictionPolicy.Execute", "an error occurred while removing items. Error " + ex.ToString());
}
keysTobeRemoved.Clear();
if (removedItems != null && removedItems.Count > 0)
{
dependentItems.AddRange(removedItems);
}
remIteration++;
if (remIteration >= removedThreshhold)
{
//put some delay so that user operations are not affected.
System.Threading.Thread.Sleep(_sleepInterval*1000);
remIteration = 0;
}
}
}
if (keysTobeRemoved.Count > 0)
{
try
{
OperationContext priorityEvictionOperationContext = new OperationContext();
priorityEvictionOperationContext.Add(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
removedItems = cache.RemoveSync(keysTobeRemoved.ToArray(), ItemRemoveReason.Underused, false, priorityEvictionOperationContext) as ArrayList;
context.PerfStatsColl.IncrementEvictPerSecStatsBy(keysTobeRemoved.Count);
if (removedItems != null && removedItems.Count > 0)
{
dependentItems.AddRange(removedItems);
}
}
catch (Exception ex)
{
NCacheLog.Error("PriorityEvictionPolicy.Execute", "an error occurred while removing items. Error " + ex.ToString());
}
}
if (dependentItems.Count > 0)
{
ArrayList removableList = new ArrayList();
if (rootCache != null)
{
foreach (object depenentItme in dependentItems)
{
if (depenentItme == null) continue;
removableList.Add(depenentItme);
if (removableList.Count % 100 == 0)
{
try
{
OperationContext priorityEvictionOperationContext = new OperationContext();
priorityEvictionOperationContext.Add(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
rootCache.CascadedRemove(removableList, ItemRemoveReason.Underused, true, priorityEvictionOperationContext);
context.PerfStatsColl.IncrementEvictPerSecStatsBy(removableList.Count);
}
catch (Exception exc)
{
NCacheLog.Error("PriorityEvictionPolicy.Execute", "an error occurred while removing dependent items. Error " + exc.ToString());
}
removableList.Clear();
}
}
if (removableList.Count > 0)
{
try
{
OperationContext priorityEvictionOperationContext = new OperationContext();
priorityEvictionOperationContext.Add(OperationContextFieldName.OperationType, OperationContextOperationType.CacheOperation);
rootCache.CascadedRemove(removableList, ItemRemoveReason.Underused, true, priorityEvictionOperationContext);
context.PerfStatsColl.IncrementEvictPerSecStatsBy(removableList.Count);
}
catch (Exception exc)
{
NCacheLog.Error("PriorityEvictionPolicy.Execute", "an error occurred while removing dependent items. Error " + exc.ToString());
}
removableList.Clear();
}
}
}
return;
}
