internal int FlushUnderUsedItems(int maxFlush, bool force)
{
if (_cEntriesInUse == 0)
{
return(0);
}
Debug.Assert(maxFlush > 0, "maxFlush is not greater than 0, instead is " + maxFlush);
Debug.Assert(_cEntriesInFlush == 0, "_cEntriesInFlush == 0");
UsageEntryRef inFlushHead = UsageEntryRef.INVALID;
UsageEntryRef prev, prevNext;
DateTime utcDate;
UsageEntry[] entries;
int entryIndex;
MemoryCacheEntry cacheEntry;
int flushed = 0;
try
{
_cacheUsage.MemoryCacheStore.BlockInsert();
lock (this)
{
Debug.Assert(_blockReduce == false, "_blockReduce == false");
if (_cEntriesInUse == 0)
{
return(0);
}
DateTime utcNow = DateTime.UtcNow;
for (prev = _lastRefTail; _cEntriesInFlush < maxFlush && !prev.IsInvalid; prev = prevNext)
{
Debug.Assert(_cEntriesInUse > 0, "_cEntriesInUse > 0");
prevNext = (_pages[(prev.PageIndex)]._entries)[prev.Ref2Index]._ref2._prev;
while (prevNext.IsRef1)
{
prevNext = (_pages[(prevNext.PageIndex)]._entries)[prevNext.Ref1Index]._ref1._prev;
}
entries = (_pages[(prev.PageIndex)]._entries);
entryIndex = prev.Ref2Index;
if (!force)
{
utcDate = entries[entryIndex]._utcDate;
Debug.Assert(utcDate != DateTime.MinValue, "utcDate != DateTime.MinValue");
if (utcNow - utcDate <= CacheUsage.NEWADD_INTERVAL && utcNow >= utcDate)
{
continue;
}
}
UsageEntryRef prev1 = (new UsageEntryRef((prev).PageIndex, (prev).Ref2Index));
cacheEntry = entries[entryIndex]._cacheEntry;
Debug.Assert(cacheEntry.UsageEntryRef == prev1, "cacheEntry.UsageEntryRef == prev1");
Dbg.Trace("CacheUsageFlushUnderUsedItem", "Flushing underused items, item=" + cacheEntry.Key + ", bucket=" + _bucket);
cacheEntry.UsageEntryRef = UsageEntryRef.INVALID;
RemoveEntryFromLastRefList(prev1);
entries[entryIndex]._ref1._next = inFlushHead;
inFlushHead = prev1;
flushed++;
_cEntriesInFlush++;
}
if (flushed == 0)
{
Dbg.Trace("CacheUsageFlushTotal", "Flush(" + maxFlush + "," + force + ") removed " + flushed +
" underused items; Time=" + DateTime.Now.ToString("o", CultureInfo.InvariantCulture));
return(0);
}
_blockReduce = true;
}
}
finally
{
_cacheUsage.MemoryCacheStore.UnblockInsert();
}
Debug.Assert(!inFlushHead.IsInvalid, "!inFlushHead.IsInvalid");
MemoryCacheStore cacheStore = _cacheUsage.MemoryCacheStore;
UsageEntryRef current = inFlushHead;
UsageEntryRef next;
while (!current.IsInvalid)
{
entries = (_pages[(current.PageIndex)]._entries);
entryIndex = current.Ref1Index;
next = entries[entryIndex]._ref1._next;
cacheEntry = entries[entryIndex]._cacheEntry;
entries[entryIndex]._cacheEntry = null;
Debug.Assert(cacheEntry.UsageEntryRef.IsInvalid, "cacheEntry.UsageEntryRef.IsInvalid");
cacheStore.Remove(cacheEntry, cacheEntry, CacheEntryRemovedReason.Evicted);
current = next;
}
try
{
_cacheUsage.MemoryCacheStore.BlockInsert();
lock (this)
{
current = inFlushHead;
while (!current.IsInvalid)
{
entries = (_pages[(current.PageIndex)]._entries);
entryIndex = current.Ref1Index;
next = entries[entryIndex]._ref1._next;
_cEntriesInFlush--;
AddUsageEntryToFreeList(current);
current = next;
}
Debug.Assert(_cEntriesInFlush == 0, "_cEntriesInFlush == 0");
_blockReduce = false;
Reduce();
Dbg.Trace("CacheUsageFlushTotal", "Flush(" + maxFlush + "," + force + ") removed " + flushed +
" underused items; Time=" + DateTime.Now.ToString("o", CultureInfo.InvariantCulture));
}
}
finally
{
_cacheUsage.MemoryCacheStore.UnblockInsert();
}
return(flushed);
}
internal void AddCacheEntry(MemoryCacheEntry cacheEntry)
{
lock (this)
{
if (_freeEntryList._head == -1)
{
Expand();
}
UsageEntryRef freeRef1 = GetFreeUsageEntry();
UsageEntryRef freeRef2 = (new UsageEntryRef((freeRef1).PageIndex, -(freeRef1).Ref1Index));
Debug.Assert(cacheEntry.UsageEntryRef.IsInvalid, "cacheEntry.UsageEntryRef.IsInvalid");
cacheEntry.UsageEntryRef = freeRef1;
UsageEntry[] entries = (_pages[(freeRef1.PageIndex)]._entries);
int entryIndex = freeRef1.Ref1Index;
entries[entryIndex]._cacheEntry = cacheEntry;
entries[entryIndex]._utcDate = DateTime.UtcNow;
entries[entryIndex]._ref1._prev = UsageEntryRef.INVALID;
entries[entryIndex]._ref2._next = _addRef2Head;
if (_lastRefHead.IsInvalid)
{
entries[entryIndex]._ref1._next = freeRef2;
entries[entryIndex]._ref2._prev = freeRef1;
_lastRefTail = freeRef2;
}
else
{
entries[entryIndex]._ref1._next = _lastRefHead;
{ if ((_lastRefHead).IsRef1)
{
(_pages[((_lastRefHead).PageIndex)]._entries)[(_lastRefHead).Ref1Index]._ref1._prev = (freeRef1);
}
else if ((_lastRefHead).IsRef2)
{
(_pages[((_lastRefHead).PageIndex)]._entries)[(_lastRefHead).Ref2Index]._ref2._prev = (freeRef1);
}
else
{
_lastRefTail = (freeRef1);
} };
UsageEntryRef next, prev;
if (_addRef2Head.IsInvalid)
{
prev = _lastRefTail;
next = UsageEntryRef.INVALID;
}
else
{
prev = (_pages[(_addRef2Head.PageIndex)]._entries)[_addRef2Head.Ref2Index]._ref2._prev;
next = _addRef2Head;
}
entries[entryIndex]._ref2._prev = prev;
{ if ((prev).IsRef1)
{
(_pages[((prev).PageIndex)]._entries)[(prev).Ref1Index]._ref1._next = (freeRef2);
}
else if ((prev).IsRef2)
{
(_pages[((prev).PageIndex)]._entries)[(prev).Ref2Index]._ref2._next = (freeRef2);
}
else
{
_lastRefHead = (freeRef2);
} };
{ if ((next).IsRef1)
{
(_pages[((next).PageIndex)]._entries)[(next).Ref1Index]._ref1._prev = (freeRef2);
}
else if ((next).IsRef2)
{
(_pages[((next).PageIndex)]._entries)[(next).Ref2Index]._ref2._prev = (freeRef2);
}
else
{
_lastRefTail = (freeRef2);
} };
}
_lastRefHead = freeRef1;
_addRef2Head = freeRef2;
_cEntriesInUse++;
Dbg.Trace("CacheUsageAdd",
"Added item=" + cacheEntry.Key +
",_bucket=" + _bucket +
",ref=" + freeRef1);
}
}
internal void UpdateCacheEntry(MemoryCacheEntry cacheEntry)
{
lock (this)
{
UsageEntryRef entryRef = cacheEntry.UsageEntryRef;
if (entryRef.IsInvalid)
{
return;
}
UsageEntry[] entries = (_pages[(entryRef.PageIndex)]._entries);
int entryIndex = entryRef.Ref1Index;
UsageEntryRef entryRef2 = (new UsageEntryRef((entryRef).PageIndex, -(entryRef).Ref1Index));
UsageEntryRef prev = entries[entryIndex]._ref2._prev;
UsageEntryRef next = entries[entryIndex]._ref2._next;
{ if ((prev).IsRef1)
{
(_pages[((prev).PageIndex)]._entries)[(prev).Ref1Index]._ref1._next = (next);
}
else if ((prev).IsRef2)
{
(_pages[((prev).PageIndex)]._entries)[(prev).Ref2Index]._ref2._next = (next);
}
else
{
_lastRefHead = (next);
} };
{ if ((next).IsRef1)
{
(_pages[((next).PageIndex)]._entries)[(next).Ref1Index]._ref1._prev = (prev);
}
else if ((next).IsRef2)
{
(_pages[((next).PageIndex)]._entries)[(next).Ref2Index]._ref2._prev = (prev);
}
else
{
_lastRefTail = (prev);
} };
if (_addRef2Head == entryRef2)
{
_addRef2Head = next;
}
entries[entryIndex]._ref2 = entries[entryIndex]._ref1;
prev = entries[entryIndex]._ref2._prev;
next = entries[entryIndex]._ref2._next;
{ if ((prev).IsRef1)
{
(_pages[((prev).PageIndex)]._entries)[(prev).Ref1Index]._ref1._next = (entryRef2);
}
else if ((prev).IsRef2)
{
(_pages[((prev).PageIndex)]._entries)[(prev).Ref2Index]._ref2._next = (entryRef2);
}
else
{
_lastRefHead = (entryRef2);
} };
{ if ((next).IsRef1)
{
(_pages[((next).PageIndex)]._entries)[(next).Ref1Index]._ref1._prev = (entryRef2);
}
else if ((next).IsRef2)
{
(_pages[((next).PageIndex)]._entries)[(next).Ref2Index]._ref2._prev = (entryRef2);
}
else
{
_lastRefTail = (entryRef2);
} };
entries[entryIndex]._ref1._prev = UsageEntryRef.INVALID;
entries[entryIndex]._ref1._next = _lastRefHead;
{ if ((_lastRefHead).IsRef1)
{
(_pages[((_lastRefHead).PageIndex)]._entries)[(_lastRefHead).Ref1Index]._ref1._prev = (entryRef);
}
else if ((_lastRefHead).IsRef2)
{
(_pages[((_lastRefHead).PageIndex)]._entries)[(_lastRefHead).Ref2Index]._ref2._prev = (entryRef);
}
else
{
_lastRefTail = (entryRef);
} };
_lastRefHead = entryRef;
Dbg.Trace("CacheUsageUpdate",
"Updated item=" + cacheEntry.Key +
",_bucket=" + _bucket +
",ref=" + entryRef);
}
}
internal int FlushExpiredItems(DateTime utcNow, bool useInsertBlock)
{
if (_cEntriesInUse == 0 || GetExpiresCount(utcNow) == 0)
{
return(0);
}
Debug.Assert(_cEntriesInFlush == 0, "_cEntriesInFlush == 0");
ExpiresEntryRef inFlushHead = ExpiresEntryRef.INVALID;
ExpiresEntry[] entries;
int entryIndex;
MemoryCacheEntry cacheEntry;
int flushed = 0;
try
{
if (useInsertBlock)
{
_cacheExpires.MemoryCacheStore.BlockInsert();
}
lock (this)
{
Debug.Assert(_blockReduce == false, "_blockReduce == false");
if (_cEntriesInUse == 0 || GetExpiresCount(utcNow) == 0)
{
return(0);
}
ResetCounts(utcNow);
int cPages = _cPagesInUse;
for (int i = 0; i < _pages.Length; i++)
{
entries = _pages[i]._entries;
if (entries != null)
{
int cEntries = NUM_ENTRIES - ((entries)[0]._cFree);
for (int j = 1; j < entries.Length; j++)
{
cacheEntry = entries[j]._cacheEntry;
if (cacheEntry != null)
{
if (entries[j]._utcExpires > utcNow)
{
AddCount(entries[j]._utcExpires);
}
else
{
cacheEntry.ExpiresBucket = 0xff;
cacheEntry.ExpiresEntryRef = ExpiresEntryRef.INVALID;
entries[j]._cFree = 1;
entries[j]._next = inFlushHead;
inFlushHead = new ExpiresEntryRef(i, j);
flushed++;
_cEntriesInFlush++;
}
cEntries--;
if (cEntries == 0)
{
break;
}
}
}
cPages--;
if (cPages == 0)
{
break;
}
}
}
if (flushed == 0)
{
Dbg.Trace("CacheExpiresFlushTotal", "FlushExpiredItems flushed " + flushed +
" expired items, bucket=" + _bucket + "; Time=" + DateTime.Now.ToString("o", CultureInfo.InvariantCulture));
return(0);
}
_blockReduce = true;
}
}
finally
{
if (useInsertBlock)
{
_cacheExpires.MemoryCacheStore.UnblockInsert();
}
}
Debug.Assert(!inFlushHead.IsInvalid, "!inFlushHead.IsInvalid");
MemoryCacheStore cacheStore = _cacheExpires.MemoryCacheStore;
ExpiresEntryRef current = inFlushHead;
ExpiresEntryRef next;
while (!current.IsInvalid)
{
entries = (_pages[(current.PageIndex)]._entries);
entryIndex = current.Index;
next = entries[entryIndex]._next;
cacheEntry = entries[entryIndex]._cacheEntry;
entries[entryIndex]._cacheEntry = null;
Debug.Assert(cacheEntry.ExpiresEntryRef.IsInvalid, "cacheEntry.ExpiresEntryRef.IsInvalid");
cacheStore.Remove(cacheEntry, cacheEntry, CacheEntryRemovedReason.Expired);
current = next;
}
try
{
if (useInsertBlock)
{
_cacheExpires.MemoryCacheStore.BlockInsert();
}
lock (this)
{
current = inFlushHead;
while (!current.IsInvalid)
{
entries = (_pages[(current.PageIndex)]._entries);
entryIndex = current.Index;
next = entries[entryIndex]._next;
_cEntriesInFlush--;
AddExpiresEntryToFreeList(current);
current = next;
}
Debug.Assert(_cEntriesInFlush == 0, "_cEntriesInFlush == 0");
_blockReduce = false;
Reduce();
Dbg.Trace("CacheExpiresFlushTotal", "FlushExpiredItems flushed " + flushed +
" expired items, bucket=" + _bucket + "; Time=" + DateTime.Now.ToString("o", CultureInfo.InvariantCulture));
}
}
finally
{
if (useInsertBlock)
{
_cacheExpires.MemoryCacheStore.UnblockInsert();
}
}
return(flushed);
}