CacheHeight.h

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#pragma once
#include "catapult/utils/SpinReaderWriterLock.h"
#include "catapult/types.h"
 
namespace catapult { namespace cache {
 
    class CacheHeightView : public utils::MoveOnly {
    public:
        explicit CacheHeightView(Height height, utils::SpinReaderWriterLock::ReaderLockGuard&& readLock)
                : m_height(height)
                , m_readLock(std::move(readLock))
        {}
 
    public:
        Height get() const {
            return m_height;
        }
 
    private:
        Height m_height;
        utils::SpinReaderWriterLock::ReaderLockGuard m_readLock;
    };
 
    class CacheHeightModifier : public utils::MoveOnly {
    public:
        explicit CacheHeightModifier(Height& height, utils::SpinReaderWriterLock::ReaderLockGuard&& readLock)
                : m_height(height)
                , m_readLock(std::move(readLock))
                , m_writeLock(m_readLock.promoteToWriter())
        {}
 
    public:
        void set(Height height) {
            m_height = height;
        }
 
    private:
        Height& m_height;
        utils::SpinReaderWriterLock::ReaderLockGuard m_readLock;
        utils::SpinReaderWriterLock::WriterLockGuard m_writeLock;
    };
 
    class CacheHeight {
    public:
        CacheHeightView view() const {
            auto readLock = m_lock.acquireReader();
            return CacheHeightView(m_height, std::move(readLock));
        }
 
        CacheHeightModifier modifier() {
            auto readLock = m_lock.acquireReader();
            return CacheHeightModifier(m_height, std::move(readLock));
        }
 
    private:
        Height m_height;
        mutable utils::SpinReaderWriterLock m_lock;
    };
}}