25188ed28e
In a typical scenario the API collect values from multiple distributed instances. Sometimes it is needed to reduce multiple maps by merging their keys and accumulating their values. This is a helper function that can be used in map_reduce to perform maps sum. Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>
53 lines
1.0 KiB
C++
53 lines
1.0 KiB
C++
/*
|
|
* Copyright 2015 Cloudius Systems
|
|
*/
|
|
|
|
#ifndef API_API_HH_
|
|
#define API_API_HH_
|
|
|
|
#include "http/httpd.hh"
|
|
#include "database.hh"
|
|
#include <boost/lexical_cast.hpp>
|
|
namespace api {
|
|
|
|
struct http_context {
|
|
http_server_control http_server;
|
|
distributed<database>& db;
|
|
http_context(distributed<database>& _db) : db(_db) {}
|
|
};
|
|
|
|
future<> set_server(http_context& ctx);
|
|
|
|
template<class T>
|
|
std::vector<sstring> container_to_vec(const T& container) {
|
|
std::vector<sstring> res;
|
|
for (auto i : container) {
|
|
res.push_back(boost::lexical_cast<std::string>(i));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
template<class T>
|
|
std::vector<T> map_to_key_value(const std::map<sstring, sstring>& map) {
|
|
std::vector<T> res;
|
|
for (auto i : map) {
|
|
res.push_back(T());
|
|
res.back().key = i.first;
|
|
res.back().value = i.second;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
template <typename T, typename S = T>
|
|
T map_sum(T&& dest, const S& src) {
|
|
for (auto i : src) {
|
|
dest[i.first] += i.second;
|
|
}
|
|
return dest;
|
|
}
|
|
|
|
|
|
}
|
|
|
|
#endif /* API_API_HH_ */
|