cc/gapir/resource_disk_cache.h

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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 GAPIR_RESOURCE_DISK_CACHE_H
#define GAPIR_RESOURCE_DISK_CACHE_H

#include "resource_cache.h"

#include <gapic/archive.h>

#include <memory>
#include <string>

namespace gapir {

// Unlimited size disk cache for resources
class ResourceDiskCache : public ResourceCache {
public:
    // Creates new disk cache with the specified base path. If the base path is not readable or it
    // can't be created then returns the fall back provider.
    static std::unique_ptr<ResourceProvider> create(
            std::unique_ptr<ResourceProvider> fallbackProvider, const std::string& path);

    // Prefetches the specified resources, caching them to disk.
    void prefetch(const Resource* resources, size_t count, const ServerConnection& server,
                  void* temp, size_t tempSize) override;

protected:
    void putCache(const Resource& resource, const void* data) override;
    bool getCache(const Resource& resource, void* data) override;

private:
    ResourceDiskCache(std::unique_ptr<ResourceProvider> fallbackProvider, const std::string& path);

    // Disk-backed archive holding the cached resources.
    gapic::Archive mArchive;
};

}  // namespace gapir

#endif  // GAPIR_RESOURCE_DISK_CACHE_H