/**

*

* @file 02_file_cache_persistence.cpp

* @author Gaspard Kirira

*

* Copyright 2025, Gaspard Kirira.

* All rights reserved.

* https://github.com/vixcpp/vix

*

* Use of this source code is governed by a MIT license

* that can be found in the License file.

*

* Vix.cpp

*

*/

// Run:

// vix run examples/cache/02_file_cache_persistence.cpp

#include <chrono>

#include <filesystem>

#include <iostream>

#include <memory>

#include <vix/cache/Cache.hpp>

#include <vix/cache/CacheContext.hpp>

#include <vix/cache/CacheEntry.hpp>

#include <vix/cache/CachePolicy.hpp>

#include <vix/cache/FileStore.hpp>

static std::int64_t now_ms()

{

using namespace std::chrono;

return duration_cast<std::chrono::milliseconds>(

std::chrono::steady_clock::now().time_since_epoch())

.count();

}

int main()

{

using namespace vix::cache;

const std::filesystem::path file = "./build/examples/cache/cache_http.json";

{

auto store = std::make_shared<FileStore>(FileStore::Config{

.file_path = file,

.pretty_json = true});

CachePolicy policy;

policy.ttl_ms = 10'000;

Cache cache(policy, store);

CacheEntry entry;

entry.status = 200;

entry.body = R"({"source":"disk"})";

entry.headers["Content-Type"] = "application/json";

entry.created_at_ms = now_ms();

cache.put("GET /api/products?limit=3", entry);

std::cout << "entry written to disk\n";

}

{

auto store = std::make_shared<FileStore>(FileStore::Config{

.file_path = file,

.pretty_json = false});

CachePolicy policy;

policy.ttl_ms = 10'000;

Cache cache(policy, store);

auto cached = cache.get(

"GET /api/products?limit=3",

now_ms() + 100,

CacheContext::Online());

if (!cached)

{

std::cout << "cache miss after reload\n";

return 1;

}

std::cout << "cache hit after reload\n";

std::cout << "body: " << cached->body << "\n";

}

return 0;

}