127 lines
4.4 KiB
C++
127 lines
4.4 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 <unordered_map>
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#include "cql3/column_specification.hh"
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#include "core/shared_ptr.hh"
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#include "types.hh"
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#include "tuple.hh"
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#include "gc_clock.hh"
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using column_id = uint32_t;
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class column_definition final {
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private:
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bytes _name;
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public:
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enum column_kind { PARTITION, CLUSTERING, REGULAR, STATIC };
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column_definition(bytes name, data_type type, column_id id, column_kind kind);
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data_type type;
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column_id id; // unique within (kind, schema instance)
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column_kind kind;
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::shared_ptr<cql3::column_specification> column_specification;
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bool is_static() const { return kind == column_kind::STATIC; }
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bool is_partition_key() const { return kind == column_kind::PARTITION; }
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bool is_clustering_key() const { return kind == column_kind::CLUSTERING; }
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bool is_primary_key() const { return kind == column_kind::PARTITION || kind == column_kind::CLUSTERING; }
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bool is_atomic() const { return !type->is_multi_cell(); }
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bool is_compact_value() const;
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const sstring& name_as_text() const;
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const bytes& name() const;
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};
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struct thrift_schema {
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shared_ptr<abstract_type> partition_key_type;
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};
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/*
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* Keep this effectively immutable.
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*/
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class schema final {
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private:
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std::unordered_map<bytes, column_definition*> _columns_by_name;
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std::map<bytes, column_definition*, serialized_compare> _regular_columns_by_name;
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public:
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struct column {
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bytes name;
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data_type type;
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struct name_compare {
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shared_ptr<abstract_type> type;
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name_compare(shared_ptr<abstract_type> type) : type(type) {}
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bool operator()(const column& cd1, const column& cd2) const {
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return type->less(cd1.name, cd2.name);
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}
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};
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};
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private:
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void build_columns(std::vector<column> columns, column_definition::column_kind kind, std::vector<column_definition>& dst);
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::shared_ptr<cql3::column_specification> make_column_specification(column_definition& def);
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public:
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gc_clock::duration default_time_to_live = gc_clock::duration::zero();
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const sstring ks_name;
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const sstring cf_name;
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std::vector<column_definition> partition_key;
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std::vector<column_definition> clustering_key;
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std::vector<column_definition> regular_columns; // sorted by name
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shared_ptr<tuple_type<>> partition_key_type;
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shared_ptr<tuple_type<>> clustering_key_type;
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shared_ptr<tuple_prefix> clustering_key_prefix_type;
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data_type regular_column_name_type;
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thrift_schema thrift;
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public:
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schema(sstring ks_name, sstring cf_name,
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std::vector<column> partition_key,
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std::vector<column> clustering_key,
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std::vector<column> regular_columns,
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shared_ptr<abstract_type> regular_column_name_type);
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bool is_dense() const {
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return false;
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}
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bool is_counter() const {
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return false;
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}
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column_definition* get_column_definition(const bytes& name);
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auto regular_begin() {
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return regular_columns.begin();
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}
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auto regular_end() {
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return regular_columns.end();
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}
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auto regular_lower_bound(const bytes& name) {
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// TODO: use regular_columns and a version of std::lower_bound() with heterogeneous comparator
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auto i = _regular_columns_by_name.lower_bound(name);
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if (i == _regular_columns_by_name.end()) {
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return regular_end();
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} else {
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return regular_columns.begin() + i->second->id;
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}
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}
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auto regular_upper_bound(const bytes& name) {
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// TODO: use regular_columns and a version of std::upper_bound() with heterogeneous comparator
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auto i = _regular_columns_by_name.upper_bound(name);
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if (i == _regular_columns_by_name.end()) {
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return regular_end();
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} else {
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return regular_columns.begin() + i->second->id;
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}
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}
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column_id get_regular_columns_count() {
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return regular_columns.size();
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}
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data_type column_name_type(column_definition& def) {
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return def.kind == column_definition::REGULAR ? regular_column_name_type : utf8_type;
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}
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column_definition& regular_column_at(column_id id) {
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return regular_columns[id];
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}
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bool is_last_partition_key(column_definition& def) {
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return &partition_key[partition_key.size() - 1] == &def;
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}
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};
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using schema_ptr = lw_shared_ptr<schema>;
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