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78a8ac8470
The "mutation_reader" defined in database.cc is a convenient mechanism for iterating over mutations. It can be useful for more than just database.cc (I want to use it in the compaction code), so this patch moves the type's definition to mutation.hh, and the make_memtable_reader() function to memtable::make_reader() (in memtable.hh). Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
/*
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* Copyright 2015 Cloudius Systems
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*/
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#pragma once
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#include <map>
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#include <memory>
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#include "database_fwd.hh"
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#include "dht/i_partitioner.hh"
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#include "schema.hh"
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#include "db/commitlog/replay_position.hh"
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class frozen_mutation;
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class memtable {
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public:
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using partitions_type = std::map<dht::decorated_key, mutation_partition, dht::decorated_key::less_comparator>;
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private:
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schema_ptr _schema;
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partitions_type partitions;
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db::replay_position _replay_position;
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void update(const db::replay_position&);
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public:
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using const_mutation_partition_ptr = std::unique_ptr<const mutation_partition>;
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public:
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explicit memtable(schema_ptr schema);
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schema_ptr schema() const { return _schema; }
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mutation_partition& find_or_create_partition(const dht::decorated_key& key);
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mutation_partition& find_or_create_partition_slow(partition_key_view key);
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row& find_or_create_row_slow(const partition_key& partition_key, const clustering_key& clustering_key);
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const_mutation_partition_ptr find_partition(const dht::decorated_key& key) const;
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void apply(const mutation& m, const db::replay_position& = db::replay_position());
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void apply(const frozen_mutation& m, const db::replay_position& = db::replay_position());
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const partitions_type& all_partitions() const;
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bool empty() const { return partitions.empty(); }
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const db::replay_position& replay_position() const {
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return _replay_position;
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}
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mutation_reader make_reader() const;
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};
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