Beispiel #1
0
        /// <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);
        }