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Merge "api: type-erase more of the column_family API" from Avi

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"Together with the already merged patch, we reduce the object file
from 114MB to 81MB."

* tag 'api-diet-1/v1' of https://github.com/avikivity/scylla:
  api: type-erase all-column_family map_reduce variant
  api: simplify 6-argument map_reduce_cf() variant
This commit is contained in:
Paweł Dziepak
2018-04-05 11:04:53 +02:00
parent 3c078d2554 6c35db2c44
commit 67aaaefde7
1 changed files with 23 additions and 16 deletions
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39
api/column_family.hh
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@@ -58,35 +58,42 @@ future<json::json_return_type> map_reduce_cf(http_context& ctx, const sstring& n
});
}
template<class Mapper, class I, class Reducer, class Result>
future<I> map_reduce_cf_raw(http_context& ctx, const sstring& name, I init,
Mapper mapper, Reducer reducer, Result result) {
auto uuid = get_uuid(name, ctx.db.local());
return ctx.db.map_reduce0([mapper, uuid](database& db) {
return mapper(db.find_column_family(uuid));
}, init, reducer);
}
template<class Mapper, class I, class Reducer, class Result>
future<json::json_return_type> map_reduce_cf(http_context& ctx, const sstring& name, I init,
Mapper mapper, Reducer reducer, Result result) {
return map_reduce_cf_raw(ctx, name, init, mapper, reducer, result).then([result](const I& res) mutable {
return map_reduce_cf_raw(ctx, name, init, mapper, reducer).then([result](const I& res) mutable {
result = res;
return make_ready_future<json::json_return_type>(result);
});
}
template<class Mapper, class I, class Reducer>
future<I> map_reduce_cf_raw(http_context& ctx, I init,
Mapper mapper, Reducer reducer) {
return ctx.db.map_reduce0([mapper, init, reducer](database& db) {
struct map_reduce_column_families_locally {
std::any init;
std::function<std::any (column_family&)> mapper;
std::function<std::any (std::any, std::any)> reducer;
std::any operator()(database& db) const {
auto res = init;
for (auto i : db.get_column_families()) {
res = reducer(res, mapper(*i.second.get()));
}
return res;
}, init, reducer);
}
};
template<class Mapper, class I, class Reducer>
future<I> map_reduce_cf_raw(http_context& ctx, I init,
Mapper mapper, Reducer reducer) {
using mapper_type = std::function<std::any (column_family&)>;
using reducer_type = std::function<std::any (std::any, std::any)>;
auto wrapped_mapper = mapper_type([mapper = std::move(mapper)] (column_family& cf) mutable {
return I(mapper(cf));
});
auto wrapped_reducer = reducer_type([reducer = std::move(reducer)] (std::any a, std::any b) mutable {
return I(reducer(std::any_cast<I>(std::move(a)), std::any_cast<I>(std::move(b))));
});
return ctx.db.map_reduce0(map_reduce_column_families_locally{init, std::move(wrapped_mapper), wrapped_reducer}, std::any(init), wrapped_reducer).then([] (std::any res) {
return std::any_cast<I>(std::move(res));
});
}