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4ab66de0ae
The immediate motivation for introducing frozen_mutation is inability to deserialize current "mutation" object, which needs schema reference at the time it's constructed. It needs schema to initialize its internal maps with proper key comparators, which depend on schema. frozen_mutation is an immutable, compact form of a mutation. It doesn't use complex in-memory strucutres, data is stored in a linear buffer. In case of frozen_mutation schema needs to be supplied only at the time mutation partition is visited. Therefore it can be trivially deserialized without schema.
76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
/*
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* Copyright (C) 2015 Cloudius Systems, Ltd.
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*/
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#include "db/serializer.hh"
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#include "frozen_mutation.hh"
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#include "partition_builder.hh"
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#include "mutation_partition_serializer.hh"
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#include "utils/UUID.hh"
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#include "utils/data_input.hh"
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//
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// Representation layout:
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//
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// <mutation> ::= <column-family-id> <partition-key> <partition>
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//
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using namespace db;
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utils::UUID
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frozen_mutation::column_family_id() const {
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data_input in(_bytes);
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return uuid_serializer::read(in);
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}
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partition_key_view
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frozen_mutation::key(const schema& s) const {
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data_input in(_bytes);
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uuid_serializer::skip(in);
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return partition_key_view_serializer::read(in);
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}
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static size_t
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serialized_size(const mutation& m) {
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return uuid_serializer(m.schema()->id()).size()
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+ partition_key_view_serializer(m.key()).size()
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+ mutation_partition_serializer::size(*m.schema(), m.partition());
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}
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frozen_mutation::frozen_mutation(bytes&& b)
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: _bytes(std::move(b))
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{ }
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frozen_mutation
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frozen_mutation::from_bytes(bytes b) {
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return { std::move(b) };
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}
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frozen_mutation::frozen_mutation(const mutation& m)
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: _bytes(bytes::initialized_later(), serialized_size(m))
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{
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data_output out(_bytes);
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uuid_serializer::write(out, m.schema()->id());
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partition_key_view_serializer::write(out, m.key());
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mutation_partition_serializer::write(out, *m.schema(), m.partition());
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}
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mutation
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frozen_mutation::unfreeze(schema_ptr schema) const {
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mutation m(key(*schema), schema);
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partition_builder b(*schema, m.partition());
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partition().accept(*schema, b);
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return m;
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}
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frozen_mutation freeze(const mutation& m) {
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return { m };
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}
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mutation_partition_view frozen_mutation::partition() const {
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data_input in(_bytes);
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uuid_serializer::skip(in);
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partition_key_view_serializer::skip(in);
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return mutation_partition_view::from_bytes(in.read_view(in.avail()));
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}
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