4cb79f04b0
In order to eventually switch to a single JSON library, most of the libjsoncpp usage is dropped in favor of rjson. Unfortunately, one usage still remains: test/utils/test_repl utility heavily depends on the *exact textual* format of its output JSON files, so replacing a library results in all tests failing because of differences in formatting. It is possible to force rjson to print its documents in the exact matching format, but that's left for later, since the issue is not critical. It would be nice though if our test suite compared JSON documents with a real JSON parser, since there are more differences - e.g. libjsoncpp keeps children of the object sorted, while rapidjson uses an unordered data structure. This change should cause no change in semantics, it strives just to replace all usage of libjsoncpp with rjson.
65 lines
2.5 KiB
C++
65 lines
2.5 KiB
C++
/*
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* Copyright (C) 2019 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "utils/rjson.hh"
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#include "bytes.hh"
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class schema;
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class partition_key;
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class clustering_row;
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class column_computation;
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using column_computation_ptr = std::unique_ptr<column_computation>;
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/*
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* Column computation represents a computation performed in order to obtain a value for a computed column.
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* Computed columns description is also available at docs/system_schema_keyspace.md. They hold values
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* not provided directly by the user, but rather computed: from other column values and possibly other sources.
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* This class is able to serialize/deserialize column computations and perform the computation itself,
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* based on given schema, partition key and clustering row. Responsibility for providing enough data
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* in the clustering row in order for computation to succeed belongs to the caller. In particular,
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* generating a value might involve performing a read-before-write if the computation is performed
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* on more values than are present in the update request.
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*/
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class column_computation {
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public:
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virtual ~column_computation() = default;
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static column_computation_ptr deserialize(bytes_view raw);
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static column_computation_ptr deserialize(const rjson::value& json);
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virtual column_computation_ptr clone() const = 0;
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virtual bytes serialize() const = 0;
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virtual bytes_opt compute_value(const schema& schema, const partition_key& key, const clustering_row& row) const = 0;
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};
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class token_column_computation : public column_computation {
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public:
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virtual column_computation_ptr clone() const override {
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return std::make_unique<token_column_computation>(*this);
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}
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virtual bytes serialize() const override;
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virtual bytes_opt compute_value(const schema& schema, const partition_key& key, const clustering_row& row) const override;
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};
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