Method tryGet

ThirdParty/libproj/vtklibproj/src/networkfilemanager.cpp:1170–1206

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bool NetworkFilePropertiesCache::tryGet(PJ_CONTEXT *ctx, const std::string &url,
                                        FileProperties &props) {
    if (cache_.tryGet(url, props)) {
        return true;
    }

    auto diskCache = DiskChunkCache::open(ctx);
    if (!diskCache)
        return false;
    auto stmt =
        diskCache->prepare("SELECT lastChecked, fileSize, lastModified, etag "
                           "FROM properties WHERE url = ?");
    if (!stmt)
        return false;
    stmt->bindText(url.c_str());
    if (stmt->execute() != SQLITE_ROW) {
        return false;
    }
    props.lastChecked = stmt->getInt64();
    props.size = stmt->getInt64();
    const char *lastModified = stmt->getText();
    props.lastModified = lastModified ? lastModified : std::string();
    const char *etag = stmt->getText();
    props.etag = etag ? etag : std::string();

    const auto ttl = pj_context_get_grid_cache_ttl(ctx);
    if (ttl > 0) {
        time_t curTime;
        time(&curTime);
        if (curTime > props.lastChecked + ttl) {
            props = FileProperties();
            return false;
        }
    }
    cache_.insert(url, props);
    return true;
}

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