97e965aac8
This is basically a glorified map<sstring, sstring>, that does some validation on the options. Analoguous structures in the past were put directly at schema.hh, but I will keep this one separate because it got slightly more complex than the average. Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
/*
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* Copyright (C) 2015 Cloudius Systems, Ltd.
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*/
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#pragma once
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#include <core/sstring.hh>
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#include <boost/lexical_cast.hpp>
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#include "exceptions/exceptions.hh"
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#include "json.hh"
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class schema;
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class caching_options {
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// For Origin, the default value for the row is "NONE". However, since our
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// row_cache will cache both keys and rows, we will default to ALL.
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//
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// FIXME: We don't yet make any changes to our caching policies based on
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// this (and maybe we shouldn't)
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static constexpr auto default_key = "ALL";
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static constexpr auto default_row = "ALL";
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sstring _key_cache;
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sstring _row_cache;
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caching_options(sstring k, sstring r) : _key_cache(k), _row_cache(r) {
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if ((k != "ALL") && (k != "NONE")) {
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throw exceptions::configuration_exception("Invalid key value: " + k);
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}
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try {
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boost::lexical_cast<unsigned long>(r);
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} catch (boost::bad_lexical_cast& e) {
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if ((r != "ALL") && (r != "NONE")) {
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throw exceptions::configuration_exception("Invalid key value: " + k);
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}
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}
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}
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friend class schema;
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caching_options() : _key_cache(default_key), _row_cache(default_row) {}
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public:
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sstring to_sstring() const {
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return json::to_json(std::map<sstring, sstring>({{ "keys", _key_cache }, { "rows_per_partition", _row_cache }}));
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}
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static caching_options from_sstring(const sstring& str) {
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auto map = json::to_map(str);
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if (map.size() > 2) {
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throw exceptions::configuration_exception("Invalid map: " + str);
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}
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sstring k;
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sstring r;
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if (map.count("keys")) {
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k = map.at("keys");
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} else {
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k = default_key;
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}
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if (map.count("rows_per_partition")) {
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r = map.at("rows_per_partition");
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} else {
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r = default_row;
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}
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return caching_options(k, r);
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}
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};
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