ViewOSMMap/diskcachemanager.cpp at main · tigerlet/ViewOSMMap · GitHub

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#include "diskcachemanager.h"
#include <QDir>
#include <QFile>
#include <QDataStream>
#include <QDebug>

DiskCacheManager::DiskCacheManager(const QString &cacheDir)
{
    if (cacheDir.isEmpty()) {
        m_cacheDir = QDir::tempPath() + "/ViewOSMMap_cache";
    } else {
        m_cacheDir = cacheDir;
    }
    QDir().mkpath(m_cacheDir);
}

DiskCacheManager::~DiskCacheManager()
{
    clear();
}

bool DiskCacheManager::saveCell(uint64_t cellKey, const GridCellData &data)
{
    QMutexLocker locker(&m_mutex);

    QString fileName = QString("%1/cell_%2.dat").arg(m_cacheDir).arg(cellKey, 16, 16, QChar('0'));
    QFile file(fileName);
    if (!file.open(QIODevice::WriteOnly)) {
        return false;
    }

    QDataStream out(&file);
    out.setVersion(QDataStream::Qt_6_0);

    out << data.cellKey;
    out << static_cast<quint32>(data.ways.size());
    for (const auto &way : data.ways) {
        out << way.id;
        out << static_cast<quint32>(way.nodeIndices.size());
        for (int idx : way.nodeIndices) {
            out << static_cast<quint32>(idx);
        }
        out << way.bbox;
        out << way.isClosed;
        out << way.layer;
        out << way.tagHead;
    }
    out << data.lastAccessTime;

    m_cellFileMap.insert(cellKey, fileName);
    return true;
}

bool DiskCacheManager::loadCell(uint64_t cellKey, GridCellData &data)
{
    QMutexLocker locker(&m_mutex);

    auto it = m_cellFileMap.find(cellKey);
    QString fileName;
    if (it != m_cellFileMap.end()) {
        fileName = it.value();
    } else {
        fileName = QString("%1/cell_%2.dat").arg(m_cacheDir).arg(cellKey, 16, 16, QChar('0'));
    }

    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly)) {
        return false;
    }

    QDataStream in(&file);
    in.setVersion(QDataStream::Qt_6_0);

    in >> data.cellKey;

    quint32 wayCount;
    in >> wayCount;
    data.ways.resize(wayCount);
    for (quint32 i = 0; i < wayCount; ++i) {
        auto &way = data.ways[i];
        in >> way.id;

        quint32 ndCount;
        in >> ndCount;
        way.nodeIndices.resize(ndCount);
        for (quint32 j = 0; j < ndCount; ++j) {
            quint32 idx;
            in >> idx;
            way.nodeIndices[j] = static_cast<int>(idx);
        }

        in >> way.bbox;
        in >> way.isClosed;
        in >> way.layer;
        in >> way.tagHead;
    }

    in >> data.lastAccessTime;

    m_cellFileMap.insert(cellKey, fileName);
    return true;
}

bool DiskCacheManager::hasCell(uint64_t cellKey) const
{
    QMutexLocker locker(&m_mutex);
    if (m_cellFileMap.contains(cellKey)) {
        return true;
    }
    QString fileName = QString("%1/cell_%2.dat").arg(m_cacheDir).arg(cellKey, 16, 16, QChar('0'));
    return QFile::exists(fileName);
}

void DiskCacheManager::removeCell(uint64_t cellKey)
{
    QMutexLocker locker(&m_mutex);

    auto it = m_cellFileMap.find(cellKey);
    if (it != m_cellFileMap.end()) {
        QFile::remove(it.value());
        m_cellFileMap.erase(it);
    } else {
        QString fileName = QString("%1/cell_%2.dat").arg(m_cacheDir).arg(cellKey, 16, 16, QChar('0'));
        QFile::remove(fileName);
    }
}

void DiskCacheManager::clear()
{
    QMutexLocker locker(&m_mutex);

    for (const QString &fileName : m_cellFileMap.values()) {
        QFile::remove(fileName);
    }
    m_cellFileMap.clear();

    QDir dir(m_cacheDir);
    QStringList filters;
    filters << "cell_*.dat";
    for (const QString &file : dir.entryList(filters)) {
        QFile::remove(dir.absoluteFilePath(file));
    }
}

int DiskCacheManager::cachedCellCount() const
{
    QMutexLocker locker(&m_mutex);
    return m_cellFileMap.size();
}