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// Copyright 2020 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef DAWNNATIVE_PERSISTENTCACHE_H_
#define DAWNNATIVE_PERSISTENTCACHE_H_
#include "dawn_native/Error.h"
#include <vector>
namespace dawn_platform {
class CachingInterface;
}
namespace dawn_native {
using PersistentCacheKey = std::vector<uint8_t>;
struct ScopedCachedBlob {
std::unique_ptr<uint8_t[]> buffer;
size_t bufferSize = 0;
};
class DeviceBase;
enum class PersistentKeyType { Shader };
class PersistentCache {
public:
PersistentCache(DeviceBase* device);
// Combines load/store operations into a single call.
// If the load was successful, a non-empty blob is returned to the caller.
// Else, the creation callback |createFn| gets invoked with a callback
// |doCache| to store the newly created blob back in the cache.
//
// Example usage:
//
// ScopedCachedBlob cachedBlob = {};
// DAWN_TRY_ASSIGN(cachedBlob, GetOrCreate(key, [&](auto doCache)) {
// // Create a new blob to be stored
// doCache(newBlobPtr, newBlobSize); // store
// }));
//
template <typename CreateFn>
ResultOrError<ScopedCachedBlob> GetOrCreate(const PersistentCacheKey& key,
CreateFn&& createFn) {
// Attempt to load an existing blob from the cache.
ScopedCachedBlob blob = LoadData(key);
if (blob.bufferSize > 0) {
return std::move(blob);
}
// Allow the caller to create a new blob to be stored for the given key.
DAWN_TRY(createFn([this, key](const void* value, size_t size) {
this->StoreData(key, value, size);
}));
return std::move(blob);
}
private:
// PersistentCache impl
ScopedCachedBlob LoadData(const PersistentCacheKey& key);
void StoreData(const PersistentCacheKey& key, const void* value, size_t size);
dawn_platform::CachingInterface* GetPlatformCache();
DeviceBase* mDevice = nullptr;
dawn_platform::CachingInterface* mCache = nullptr;
};
} // namespace dawn_native
#endif // DAWNNATIVE_PERSISTENTCACHE_H_