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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "onnx_wrapper.h"
#include <vespa/vespalib/stllike/string.h>
#include <memory>
#include <mutex>
#include <map>
namespace vespalib::eval {
/**
* Cache used to share loaded onnx models between users. The cache
* itself will not keep anything alive, but will let you find loaded
* models that are currently in use by others.
**/
class OnnxModelCache
{
private:
struct ctor_tag {};
using Key = vespalib::string;
struct Value {
size_t num_refs;
std::unique_ptr<Onnx> model;
Value(std::unique_ptr<Onnx> model_in) : num_refs(0), model(std::move(model_in)) {}
const Onnx &get() { return *model; }
};
using Map = std::map<Key,Value>;
static std::mutex _lock;
static Map _cached;
static void release(Map::iterator entry);
public:
class Token
{
private:
OnnxModelCache::Map::iterator _entry;
public:
Token(Token &&) = delete;
Token(const Token &) = delete;
Token &operator=(Token &&) = delete;
Token &operator=(const Token &) = delete;
using UP = std::unique_ptr<Token>;
explicit Token(OnnxModelCache::Map::iterator entry, ctor_tag) : _entry(entry) {
++_entry->second.num_refs;
}
const Onnx &get() const { return _entry->second.get(); }
~Token() { OnnxModelCache::release(_entry); }
};
static Token::UP load(const vespalib::string &model_file);
static size_t num_cached();
static size_t count_refs();
};
}
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