50 lines
997 B
C++
50 lines
997 B
C++
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#pragma once
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#include <cstdint>
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#include <cstdlib>
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#include <vector>
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#include "mvcc/id.hpp"
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#include "transactions/snapshot.hpp"
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namespace tx
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{
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class Engine;
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// Has read only capbilities.
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// TODO: Not all applicable methods in code have been changed to accept
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// TransactionRead instead of a Transaction.
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class TransactionRead
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{
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friend class Engine;
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public:
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TransactionRead(Engine &engine);
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TransactionRead(const Id &&id, const Snapshot<Id> &&snapshot,
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Engine &engine);
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TransactionRead(const Id &id, const Snapshot<Id> &snapshot, Engine &engine);
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// Return id of oldest transaction from snapshot.
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Id oldest_active();
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// True if id is in snapshot.
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bool in_snapshot(const Id &id) const;
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// index of this transaction
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const Id id;
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// index of the current command in the current transaction;
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uint8_t cid;
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Engine &engine;
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protected:
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// a snapshot of currently active transactions
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Snapshot<Id> snapshot;
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};
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}
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