24 #ifndef PXR_USD_AR_THREAD_LOCAL_SCOPED_CACHE_H
25 #define PXR_USD_AR_THREAD_LOCAL_SCOPED_CACHE_H
28 #include "pxr/usd/ar/api.h"
30 #include "pxr/base/vt/value.h"
33 #include <tbb/enumerable_thread_specific.h>
37 PXR_NAMESPACE_OPEN_SCOPE
65 template <
class CachedType>
69 using CachePtr = std::shared_ptr<CachedType>;
71 void BeginCacheScope(
VtValue* cacheScopeData)
76 if (!cacheScopeData ||
78 !cacheScopeData->
IsHolding<CachePtr>())) {
83 _CachePtrStack& cacheStack = _threadCacheStack.local();
84 if (cacheScopeData->
IsHolding<CachePtr>()) {
85 cacheStack.push_back(cacheScopeData->
UncheckedGet<CachePtr>());
88 if (cacheStack.empty()) {
89 cacheStack.push_back(std::make_shared<CachedType>());
92 cacheStack.push_back(cacheStack.back());
95 *cacheScopeData = cacheStack.back();
98 void EndCacheScope(
VtValue* cacheScopeData)
100 _CachePtrStack& cacheStack = _threadCacheStack.local();
102 cacheStack.pop_back();
106 CachePtr GetCurrentCache()
108 _CachePtrStack& cacheStack = _threadCacheStack.local();
109 return (cacheStack.empty() ? CachePtr() : cacheStack.back());
113 using _CachePtrStack = std::vector<CachePtr>;
114 using _ThreadLocalCachePtrStack =
115 tbb::enumerable_thread_specific<_CachePtrStack>;
116 _ThreadLocalCachePtrStack _threadCacheStack;
119 PXR_NAMESPACE_CLOSE_SCOPE
121 #endif // PXR_USD_AR_THREAD_LOCAL_SCOPED_CACHE_H
T const & UncheckedGet() const
Returns a const reference to the held object if the held object is of type T.
#define TF_CODING_ERROR(fmt, args)
Issue an internal programming error, but continue execution.
bool IsHolding() const
Return true if this value is holding an object of type T, false otherwise.
Low-level utilities for informing users of various internal and external diagnostic conditions...
#define TF_VERIFY(cond, format,...)
Checks a condition and reports an error if it evaluates false.
Utility class for custom resolver implementations.
bool IsEmpty() const
Returns true iff this value is empty.
Provides a container which may hold any type, and provides introspection and iteration over array typ...