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Add some more verbose DDC logging #rb none #ROBOMERGE-OWNER: ben.ingram #ROBOMERGE-AUTHOR: ben.ingram #ROBOMERGE-SOURCE: CL 12905133 in //UE4/Release-4.25/... via CL 12905135 via CL 12905175 #ROBOMERGE-BOT: RELEASE (Release-Engine-Staging -> Main) (v682-12900288) [CL 12907642 by ben ingram in Main branch]
555 lines
19 KiB
C++
555 lines
19 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "CoreMinimal.h"
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#include "Misc/CommandLine.h"
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#include "HAL/ThreadSafeCounter.h"
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#include "Misc/ScopeLock.h"
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#include "Stats/StatsMisc.h"
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#include "Stats/Stats.h"
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#include "Async/AsyncWork.h"
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#include "Async/TaskGraphInterfaces.h"
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#include "Serialization/MemoryReader.h"
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#include "Serialization/MemoryWriter.h"
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#include "Modules/ModuleManager.h"
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#include "DerivedDataCacheInterface.h"
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#include "DerivedDataBackendInterface.h"
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#include "DerivedDataPluginInterface.h"
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#include "DDCCleanup.h"
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#include "ProfilingDebugging/CookStats.h"
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DEFINE_STAT(STAT_DDC_NumGets);
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DEFINE_STAT(STAT_DDC_NumPuts);
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DEFINE_STAT(STAT_DDC_NumBuilds);
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DEFINE_STAT(STAT_DDC_NumExist);
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DEFINE_STAT(STAT_DDC_SyncGetTime);
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DEFINE_STAT(STAT_DDC_ASyncWaitTime);
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DEFINE_STAT(STAT_DDC_PutTime);
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DEFINE_STAT(STAT_DDC_SyncBuildTime);
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DEFINE_STAT(STAT_DDC_ExistTime);
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//#define DDC_SCOPE_CYCLE_COUNTER(x) QUICK_SCOPE_CYCLE_COUNTER(STAT_ ## x)
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#define DDC_SCOPE_CYCLE_COUNTER(x) TRACE_CPUPROFILER_EVENT_SCOPE(x);
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#if ENABLE_COOK_STATS
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#include "DerivedDataCacheUsageStats.h"
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namespace DerivedDataCacheCookStats
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{
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// Use to prevent potential divide by zero issues
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inline double SafeDivide(const int64 Numerator, const int64 Denominator)
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{
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return Denominator != 0 ? (double)Numerator / (double)Denominator : 0.0;
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}
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// AddCookStats cannot be a lambda because of false positives in static analysis.
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// See https://developercommunity.visualstudio.com/content/problem/576913/c6244-regression-in-new-lambda-processorpermissive.html
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static void AddCookStats(FCookStatsManager::AddStatFuncRef AddStat)
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{
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TMap<FString, FDerivedDataCacheUsageStats> DDCStats;
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GetDerivedDataCacheRef().GatherUsageStats(DDCStats);
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{
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const FString StatName(TEXT("DDC.Usage"));
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for (const auto& UsageStatPair : DDCStats)
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{
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UsageStatPair.Value.LogStats(AddStat, StatName, UsageStatPair.Key);
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}
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}
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// Now lets add some summary data to that applies some crazy knowledge of how we set up our DDC. The goal
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// is to print out the global hit rate, and the hit rate of the local and shared DDC.
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// This is done by adding up the total get/miss calls the root node receives.
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// Then we find the FileSystem nodes that correspond to the local and shared cache using some hacky logic to detect a "network drive".
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// If the DDC graph ever contains more than one local or remote filesystem, this will only find one of them.
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{
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TArray<FString, TInlineAllocator<20>> Keys;
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DDCStats.GenerateKeyArray(Keys);
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FString* RootKey = Keys.FindByPredicate([](const FString& Key) {return Key.StartsWith(TEXT(" 0:")); });
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// look for a Filesystem DDC that doesn't have a UNC path. Ugly, yeah, but we only cook on PC at the moment.
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FString* LocalDDCKey = Keys.FindByPredicate([](const FString& Key) {return Key.Contains(TEXT(": FileSystem.")) && !Key.Contains(TEXT("//")); });
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// look for a UNC path
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FString* SharedDDCKey = Keys.FindByPredicate([](const FString& Key) {return Key.Contains(TEXT(": FileSystem.//")); });
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if (RootKey)
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{
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const FDerivedDataCacheUsageStats& RootStats = DDCStats[*RootKey];
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int64 TotalGetHits =
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RootStats.GetStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Hit, FCookStats::CallStats::EStatType::Counter, true) +
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RootStats.GetStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Hit, FCookStats::CallStats::EStatType::Counter, false);
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int64 TotalGetMisses =
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RootStats.GetStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Miss, FCookStats::CallStats::EStatType::Counter, true) +
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RootStats.GetStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Miss, FCookStats::CallStats::EStatType::Counter, false);
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int64 TotalGets = TotalGetHits + TotalGetMisses;
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int64 LocalHits = 0;
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if (LocalDDCKey)
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{
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const FDerivedDataCacheUsageStats& LocalDDCStats = DDCStats[*LocalDDCKey];
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LocalHits =
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LocalDDCStats.GetStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Hit, FCookStats::CallStats::EStatType::Counter, true) +
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LocalDDCStats.GetStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Hit, FCookStats::CallStats::EStatType::Counter, false);
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}
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int64 SharedHits = 0;
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if (SharedDDCKey)
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{
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// The shared DDC is only queried if the local one misses (or there isn't one). So it's hit rate is technically
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const FDerivedDataCacheUsageStats& SharedDDCStats = DDCStats[*SharedDDCKey];
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SharedHits =
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SharedDDCStats.GetStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Hit, FCookStats::CallStats::EStatType::Counter, true) +
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SharedDDCStats.GetStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Hit, FCookStats::CallStats::EStatType::Counter, false);
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}
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int64 TotalPutHits =
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RootStats.PutStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Hit, FCookStats::CallStats::EStatType::Counter, true) +
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RootStats.PutStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Hit, FCookStats::CallStats::EStatType::Counter, false);
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int64 TotalPutMisses =
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RootStats.PutStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Miss, FCookStats::CallStats::EStatType::Counter, true) +
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RootStats.PutStats.GetAccumulatedValue(FCookStats::CallStats::EHitOrMiss::Miss, FCookStats::CallStats::EStatType::Counter, false);
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int64 TotalPuts = TotalPutHits + TotalPutMisses;
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AddStat(TEXT("DDC.Summary"), FCookStatsManager::CreateKeyValueArray(
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TEXT("TotalGetHits"), TotalGetHits,
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TEXT("TotalGets"), TotalGets,
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TEXT("TotalGetHitPct"), SafeDivide(TotalGetHits, TotalGets),
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TEXT("LocalGetHitPct"), SafeDivide(LocalHits, TotalGets),
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TEXT("SharedGetHitPct"), SafeDivide(SharedHits, TotalGets),
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TEXT("OtherGetHitPct"), SafeDivide((TotalGetHits - LocalHits - SharedHits), TotalGets),
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TEXT("GetMissPct"), SafeDivide(TotalGetMisses, TotalGets),
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TEXT("TotalPutHits"), TotalPutHits,
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TEXT("TotalPuts"), TotalPuts,
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TEXT("TotalPutHitPct"), SafeDivide(TotalPutHits, TotalPuts),
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TEXT("PutMissPct"), SafeDivide(TotalPutMisses, TotalPuts)
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));
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}
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}
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}
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FCookStatsManager::FAutoRegisterCallback RegisterCookStats(AddCookStats);
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}
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#endif
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/** Whether we want to verify the DDC (pass in -VerifyDDC on the command line)*/
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bool GVerifyDDC = false;
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/**
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* Implementation of the derived data cache
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* This API is fully threadsafe
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**/
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class FDerivedDataCache : public FDerivedDataCacheInterface
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{
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/**
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* Async worker that checks the cache backend and if that fails, calls the deriver to build the data and then puts the results to the cache
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**/
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friend class FBuildAsyncWorker;
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class FBuildAsyncWorker : public FNonAbandonableTask
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{
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public:
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/**
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* Constructor for async task
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* @param InDataDeriver plugin to produce cache key and in the event of a miss, return the data.
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* @param InCacheKey Complete cache key for this data.
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**/
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FBuildAsyncWorker(FDerivedDataPluginInterface* InDataDeriver, const TCHAR* InCacheKey, bool bInSynchronousForStats)
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: bSuccess(false)
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, bSynchronousForStats(bInSynchronousForStats)
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, bDataWasBuilt(false)
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, DataDeriver(InDataDeriver)
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, CacheKey(InCacheKey)
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{
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}
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/** Async worker that checks the cache backend and if that fails, calls the deriver to build the data and then puts the results to the cache **/
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void DoWork()
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{
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TRACE_CPUPROFILER_EVENT_SCOPE(DDC_DoWork);
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const int32 NumBeforeDDC = Data.Num();
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bool bGetResult;
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{
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TRACE_CPUPROFILER_EVENT_SCOPE(DDC_Get);
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INC_DWORD_STAT(STAT_DDC_NumGets);
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STAT(double ThisTime = 0);
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{
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SCOPE_SECONDS_COUNTER(ThisTime);
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bGetResult = FDerivedDataBackend::Get().GetRoot().GetCachedData(*CacheKey, Data);
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}
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INC_FLOAT_STAT_BY(STAT_DDC_SyncGetTime, bSynchronousForStats ? (float)ThisTime : 0.0f);
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}
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if (bGetResult)
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{
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if(GVerifyDDC && DataDeriver && DataDeriver->IsDeterministic())
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{
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TArray<uint8> CmpData;
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DataDeriver->Build(CmpData);
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const int32 NumInDDC = Data.Num() - NumBeforeDDC;
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const int32 NumGenerated = CmpData.Num();
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bool bMatchesInSize = NumGenerated == NumInDDC;
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bool bDifferentMemory = true;
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int32 DifferentOffset = 0;
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if (bMatchesInSize)
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{
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bDifferentMemory = false;
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for (int32 i = 0; i < NumGenerated; i++)
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{
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if (CmpData[i] != Data[i])
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{
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bDifferentMemory = true;
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DifferentOffset = i;
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break;
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}
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}
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}
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if(!bMatchesInSize || bDifferentMemory)
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{
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FString ErrMsg = FString::Printf(TEXT("There is a mismatch between the DDC data and the generated data for plugin (%s) for asset (%s). BytesInDDC:%d, BytesGenerated:%d, bDifferentMemory:%d, offset:%d"), DataDeriver->GetPluginName(), *DataDeriver->GetDebugContextString(), NumInDDC, NumGenerated, bDifferentMemory, DifferentOffset);
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ensureMsgf(false, TEXT("%s"), *ErrMsg);
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UE_LOG(LogDerivedDataCache, Error, TEXT("%s"), *ErrMsg );
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}
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}
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check(Data.Num());
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bSuccess = true;
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delete DataDeriver;
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DataDeriver = NULL;
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}
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else if (DataDeriver)
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{
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{
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TRACE_CPUPROFILER_EVENT_SCOPE(DDC_Build);
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INC_DWORD_STAT(STAT_DDC_NumBuilds);
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STAT(double ThisTime = 0);
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{
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SCOPE_SECONDS_COUNTER(ThisTime);
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bSuccess = DataDeriver->Build(Data);
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bDataWasBuilt = true;
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}
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INC_FLOAT_STAT_BY(STAT_DDC_SyncBuildTime, bSynchronousForStats ? (float)ThisTime : 0.0f);
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}
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delete DataDeriver;
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DataDeriver = NULL;
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if (bSuccess)
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{
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check(Data.Num());
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TRACE_CPUPROFILER_EVENT_SCOPE(DDC_Put);
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INC_DWORD_STAT(STAT_DDC_NumPuts);
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STAT(double ThisTime = 0);
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{
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SCOPE_SECONDS_COUNTER(ThisTime);
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FDerivedDataBackend::Get().GetRoot().PutCachedData(*CacheKey, Data, true);
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}
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INC_FLOAT_STAT_BY(STAT_DDC_PutTime, bSynchronousForStats ? (float)ThisTime : 0.0f);
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}
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}
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if (!bSuccess)
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{
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Data.Empty();
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}
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FDerivedDataBackend::Get().AddToAsyncCompletionCounter(-1);
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}
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FORCEINLINE TStatId GetStatId() const
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{
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RETURN_QUICK_DECLARE_CYCLE_STAT(FBuildAsyncWorker, STATGROUP_ThreadPoolAsyncTasks);
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}
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/** true in the case of a cache hit, otherwise the result of the deriver build call **/
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bool bSuccess;
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/** true if we should record the timing **/
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bool bSynchronousForStats;
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/** true if we had to build the data */
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bool bDataWasBuilt;
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/** Data dervier we are operating on **/
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FDerivedDataPluginInterface* DataDeriver;
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/** Cache key associated with this build **/
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FString CacheKey;
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/** Data to return to caller, later **/
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TArray<uint8> Data;
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};
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public:
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/** Constructor, called once to cereate a singleton **/
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FDerivedDataCache()
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: CurrentHandle(19248) // we will skip some potential handles to catch errors
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{
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FDerivedDataBackend::Get(); // we need to make sure this starts before we all us to start
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GVerifyDDC = FParse::Param(FCommandLine::Get(), TEXT("VerifyDDC"));
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UE_CLOG(GVerifyDDC, LogDerivedDataCache, Display, TEXT("Items retrieved from the DDC will be verified (-VerifyDDC)"));
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}
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/** Destructor, flushes all sync tasks **/
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~FDerivedDataCache()
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{
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FScopeLock ScopeLock(&SynchronizationObject);
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for (TMap<uint32,FAsyncTask<FBuildAsyncWorker>*>::TIterator It(PendingTasks); It; ++It)
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{
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It.Value()->EnsureCompletion();
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delete It.Value();
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}
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PendingTasks.Empty();
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}
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virtual bool GetSynchronous(FDerivedDataPluginInterface* DataDeriver, TArray<uint8>& OutData, bool* bDataWasBuilt = nullptr) override
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{
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DDC_SCOPE_CYCLE_COUNTER(DDC_GetSynchronous);
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check(DataDeriver);
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FString CacheKey = FDerivedDataCache::BuildCacheKey(DataDeriver);
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UE_LOG(LogDerivedDataCache, VeryVerbose, TEXT("GetSynchronous %s from '%s'"), *CacheKey, *DataDeriver->GetDebugContextString());
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FAsyncTask<FBuildAsyncWorker> PendingTask(DataDeriver, *CacheKey, true);
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AddToAsyncCompletionCounter(1);
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PendingTask.StartSynchronousTask();
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OutData = PendingTask.GetTask().Data;
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if (bDataWasBuilt)
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{
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*bDataWasBuilt = PendingTask.GetTask().bDataWasBuilt;
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}
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return PendingTask.GetTask().bSuccess;
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}
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virtual uint32 GetAsynchronous(FDerivedDataPluginInterface* DataDeriver) override
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{
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DDC_SCOPE_CYCLE_COUNTER(DDC_GetAsynchronous);
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FScopeLock ScopeLock(&SynchronizationObject);
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const uint32 Handle = NextHandle();
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FString CacheKey = FDerivedDataCache::BuildCacheKey(DataDeriver);
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UE_LOG(LogDerivedDataCache, VeryVerbose, TEXT("GetAsynchronous %s from '%s', Handle %d"), *CacheKey, *DataDeriver->GetDebugContextString(), Handle);
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const bool bSync = !DataDeriver->IsBuildThreadsafe();
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FAsyncTask<FBuildAsyncWorker>* AsyncTask = new FAsyncTask<FBuildAsyncWorker>(DataDeriver, *CacheKey, bSync);
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check(!PendingTasks.Contains(Handle));
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PendingTasks.Add(Handle,AsyncTask);
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AddToAsyncCompletionCounter(1);
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if (!bSync)
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{
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AsyncTask->StartBackgroundTask();
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}
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else
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{
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AsyncTask->StartSynchronousTask();
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}
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// Must return a valid handle
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check(Handle != 0);
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return Handle;
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}
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virtual bool PollAsynchronousCompletion(uint32 Handle) override
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{
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DDC_SCOPE_CYCLE_COUNTER(DDC_PollAsynchronousCompletion);
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FAsyncTask<FBuildAsyncWorker>* AsyncTask = NULL;
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{
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FScopeLock ScopeLock(&SynchronizationObject);
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AsyncTask = PendingTasks.FindRef(Handle);
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}
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check(AsyncTask);
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return AsyncTask->IsDone();
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}
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virtual void WaitAsynchronousCompletion(uint32 Handle) override
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{
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DDC_SCOPE_CYCLE_COUNTER(DDC_WaitAsynchronousCompletion);
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STAT(double ThisTime = 0);
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{
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SCOPE_SECONDS_COUNTER(ThisTime);
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FAsyncTask<FBuildAsyncWorker>* AsyncTask = NULL;
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{
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FScopeLock ScopeLock(&SynchronizationObject);
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AsyncTask = PendingTasks.FindRef(Handle);
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}
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check(AsyncTask);
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AsyncTask->EnsureCompletion();
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UE_LOG(LogDerivedDataCache, Verbose, TEXT("WaitAsynchronousCompletion, Handle %d"), Handle);
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}
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INC_FLOAT_STAT_BY(STAT_DDC_ASyncWaitTime,(float)ThisTime);
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}
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virtual bool GetAsynchronousResults(uint32 Handle, TArray<uint8>& OutData, bool* bOutDataWasBuilt = nullptr) override
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{
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DDC_SCOPE_CYCLE_COUNTER(DDC_GetAsynchronousResults);
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FAsyncTask<FBuildAsyncWorker>* AsyncTask = NULL;
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{
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FScopeLock ScopeLock(&SynchronizationObject);
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PendingTasks.RemoveAndCopyValue(Handle,AsyncTask);
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}
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check(AsyncTask);
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const bool bDataWasBuilt = AsyncTask->GetTask().bDataWasBuilt;
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if (bOutDataWasBuilt)
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{
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*bOutDataWasBuilt = bDataWasBuilt;
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}
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if (!AsyncTask->GetTask().bSuccess)
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{
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UE_LOG(LogDerivedDataCache, Verbose, TEXT("GetAsynchronousResults, bDataWasBuilt: %d, Handle %d, FAILED"), (int32)bDataWasBuilt, Handle);
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delete AsyncTask;
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return false;
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}
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UE_LOG(LogDerivedDataCache, Verbose, TEXT("GetAsynchronousResults, bDataWasBuilt: %d, Handle %d, SUCCESS"), (int32)bDataWasBuilt, Handle);
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OutData = MoveTemp(AsyncTask->GetTask().Data);
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delete AsyncTask;
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check(OutData.Num());
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return true;
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}
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virtual bool GetSynchronous(const TCHAR* CacheKey, TArray<uint8>& OutData, FStringView DataContext) override
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{
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DDC_SCOPE_CYCLE_COUNTER(DDC_GetSynchronous_Data);
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UE_LOG(LogDerivedDataCache, VeryVerbose, TEXT("GetSynchronous %s from '%.*s'"), CacheKey, DataContext.Len(), DataContext.GetData());
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FAsyncTask<FBuildAsyncWorker> PendingTask((FDerivedDataPluginInterface*)NULL, CacheKey, true);
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AddToAsyncCompletionCounter(1);
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PendingTask.StartSynchronousTask();
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OutData = PendingTask.GetTask().Data;
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return PendingTask.GetTask().bSuccess;
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}
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virtual uint32 GetAsynchronous(const TCHAR* CacheKey, FStringView DataContext) override
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{
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DDC_SCOPE_CYCLE_COUNTER(DDC_GetAsynchronous_Handle);
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FScopeLock ScopeLock(&SynchronizationObject);
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const uint32 Handle = NextHandle();
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UE_LOG(LogDerivedDataCache, VeryVerbose, TEXT("GetAsynchronous %s from '%.*s', Handle %d"), CacheKey, DataContext.Len(), DataContext.GetData(), Handle);
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FAsyncTask<FBuildAsyncWorker>* AsyncTask = new FAsyncTask<FBuildAsyncWorker>((FDerivedDataPluginInterface*)NULL, CacheKey, false);
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check(!PendingTasks.Contains(Handle));
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PendingTasks.Add(Handle, AsyncTask);
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AddToAsyncCompletionCounter(1);
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AsyncTask->StartBackgroundTask();
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return Handle;
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}
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virtual void Put(const TCHAR* CacheKey, TArrayView<const uint8> Data, FStringView DataContext, bool bPutEvenIfExists = false) override
|
|
{
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|
DDC_SCOPE_CYCLE_COUNTER(DDC_Put);
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UE_LOG(LogDerivedDataCache, VeryVerbose, TEXT("Put %s from '%.*s'"), CacheKey, DataContext.Len(), DataContext.GetData());
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|
STAT(double ThisTime = 0);
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|
{
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|
SCOPE_SECONDS_COUNTER(ThisTime);
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|
FDerivedDataBackend::Get().GetRoot().PutCachedData(CacheKey, Data, bPutEvenIfExists);
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|
}
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|
INC_FLOAT_STAT_BY(STAT_DDC_PutTime,(float)ThisTime);
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|
INC_DWORD_STAT(STAT_DDC_NumPuts);
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|
}
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|
|
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virtual void MarkTransient(const TCHAR* CacheKey) override
|
|
{
|
|
FDerivedDataBackend::Get().GetRoot().RemoveCachedData(CacheKey, /*bTransient=*/ true);
|
|
}
|
|
|
|
virtual bool CachedDataProbablyExists(const TCHAR* CacheKey) override
|
|
{
|
|
DDC_SCOPE_CYCLE_COUNTER(DDC_CachedDataProbablyExists);
|
|
bool bResult;
|
|
INC_DWORD_STAT(STAT_DDC_NumExist);
|
|
STAT(double ThisTime = 0);
|
|
{
|
|
SCOPE_SECONDS_COUNTER(ThisTime);
|
|
bResult = FDerivedDataBackend::Get().GetRoot().CachedDataProbablyExists(CacheKey);
|
|
}
|
|
INC_FLOAT_STAT_BY(STAT_DDC_ExistTime, (float)ThisTime);
|
|
return bResult;
|
|
}
|
|
|
|
void NotifyBootComplete() override
|
|
{
|
|
DDC_SCOPE_CYCLE_COUNTER(DDC_NotifyBootComplete);
|
|
FDerivedDataBackend::Get().NotifyBootComplete();
|
|
}
|
|
|
|
void AddToAsyncCompletionCounter(int32 Addend) override
|
|
{
|
|
FDerivedDataBackend::Get().AddToAsyncCompletionCounter(Addend);
|
|
}
|
|
|
|
void WaitForQuiescence(bool bShutdown) override
|
|
{
|
|
DDC_SCOPE_CYCLE_COUNTER(DDC_WaitForQuiescence);
|
|
FDerivedDataBackend::Get().WaitForQuiescence(bShutdown);
|
|
}
|
|
|
|
/** Get whether a Shared Data Cache is in use */
|
|
virtual bool GetUsingSharedDDC() const override
|
|
{
|
|
return FDerivedDataBackend::Get().GetUsingSharedDDC();
|
|
}
|
|
|
|
void GetDirectories(TArray<FString>& OutResults) override
|
|
{
|
|
FDerivedDataBackend::Get().GetDirectories(OutResults);
|
|
}
|
|
|
|
virtual void GatherUsageStats(TMap<FString, FDerivedDataCacheUsageStats>& UsageStatsMap) override
|
|
{
|
|
FDerivedDataBackend::Get().GatherUsageStats(UsageStatsMap);
|
|
}
|
|
|
|
/** Get event delegate for data cache notifications */
|
|
virtual FOnDDCNotification& GetDDCNotificationEvent()
|
|
{
|
|
return DDCNotificationEvent;
|
|
}
|
|
|
|
protected:
|
|
uint32 NextHandle()
|
|
{
|
|
return (uint32)CurrentHandle.Increment();
|
|
}
|
|
|
|
|
|
private:
|
|
|
|
/**
|
|
* Internal function to build a cache key out of the plugin name, versions and plugin specific info
|
|
* @param DataDeriver plugin to produce the elements of the cache key.
|
|
* @return Assembled cache key
|
|
**/
|
|
static FString BuildCacheKey(FDerivedDataPluginInterface* DataDeriver)
|
|
{
|
|
FString Result = FDerivedDataCacheInterface::BuildCacheKey(DataDeriver->GetPluginName(), DataDeriver->GetVersionString(), *DataDeriver->GetPluginSpecificCacheKeySuffix());
|
|
return Result;
|
|
}
|
|
|
|
|
|
/** Counter used to produce unique handles **/
|
|
FThreadSafeCounter CurrentHandle;
|
|
/** Object used for synchronization via a scoped lock **/
|
|
FCriticalSection SynchronizationObject;
|
|
/** Map of handle to pending task **/
|
|
TMap<uint32,FAsyncTask<FBuildAsyncWorker>*> PendingTasks;
|
|
|
|
/** Cache notification delegate */
|
|
FOnDDCNotification DDCNotificationEvent;
|
|
};
|
|
|
|
/**
|
|
* Module for the DDC
|
|
*/
|
|
class FDerivedDataCacheModule : public IDerivedDataCacheModule
|
|
{
|
|
public:
|
|
virtual FDerivedDataCacheInterface& GetDDC() override
|
|
{
|
|
static FDerivedDataCache SingletonInstance;
|
|
return SingletonInstance;
|
|
}
|
|
|
|
virtual void StartupModule() override
|
|
{
|
|
GetDDC();
|
|
}
|
|
|
|
virtual void ShutdownModule() override
|
|
{
|
|
FDDCCleanup::Shutdown();
|
|
}
|
|
};
|
|
|
|
IMPLEMENT_MODULE( FDerivedDataCacheModule, DerivedDataCache);
|