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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2026
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/actor/actor.h"
#include "td/utils/common.h"
#include "td/utils/FlatHashMap.h"
#include "td/utils/Promise.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include <functional>
#include <queue>
namespace td {
// merges queries into a single request
class QueryMerger final : public Actor {
public:
QueryMerger(Slice name, size_t max_concurrent_query_count, size_t max_merged_query_count);
using MergeFunction = std::function<void(vector<int64> query_ids, Promise<Unit> &&promise)>;
void set_merge_function(MergeFunction merge_function) {
merge_function_ = std::move(merge_function);
}
void add_query(int64 query_id, Promise<Unit> &&promise, const char *source);
private:
struct QueryInfo {
vector<Promise<Unit>> promises_;
};
size_t query_count_ = 0;
size_t max_concurrent_query_count_;
size_t max_merged_query_count_;
MergeFunction merge_function_;
std::queue<int64> pending_queries_;
FlatHashMap<int64, QueryInfo> queries_;
void send_query(vector<int64> query_ids);
void on_get_query_result(vector<int64> query_ids, Result<Unit> &&result);
void loop() final;
};
} // namespace td
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