Program Listing for File random-access-async-storage.h

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#pragma once

#include "serialization/memorybacked-serializer.h"
#include "serialization/random-access-serializer.h"
#include "stream/types.h"
#include "stream/storage.h"
#include "concurrent/lock.h"

#include <memory>
#include <functional>
#include <mutex>

namespace gpa {

namespace stream {
class RandomAccessStorage;
class View;
}  // namespace stream

namespace serialization {

using UnlockDeleter = std::function<void(MemoryBackedSerializer*)>;
using SerializerUniquePointer = std::unique_ptr<MemoryBackedSerializer, UnlockDeleter>;

class RandomAccessAsyncStorage
{
public:
    enum : int64_t {
        kInvalidOffset = INT64_MAX,
    };

    RandomAccessAsyncStorage(stream::RandomAccessStorage* storage);
    ~RandomAccessAsyncStorage();

    std::unique_ptr<RandomAccessSerializer, UnlockDeleter> GetRandomSerializerAndLock();

    std::unique_ptr<MemoryBackedSerializer, UnlockDeleter> GetSerializerForReservedSpace(size_t size, uint64_t* absoluteOffset = nullptr);

    std::unique_ptr<MemoryBackedSerializer, UnlockDeleter> GetSerializerForExistingSpace(uint64_t absoluteOffset, size_t size);

private:
    RandomAccessSerializer mStorageSerializer;

    RWLock mSerializersAccessLock;

    std::mutex mMutex;
};

}  // namespace serialization
}  // namespace gpa