ClickHouse/dbms/include/DB/Storages/MergeTree/ReplicatedMergeTreeQuorumEntry.h

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#pragma once
#include <DB/Core/Types.h>
#include <DB/IO/ReadBuffer.h>
#include <DB/IO/ReadBufferFromString.h>
#include <DB/IO/WriteBuffer.h>
#include <DB/IO/WriteBufferFromString.h>
#include <DB/IO/Operators.h>
#include <zkutil/ZooKeeper.h>
namespace DB
{
/** Для реализации функциональности "кворумная запись".
* Информация о том, на каких репликах появился вставленный кусок данных,
* и на скольких репликах он должен быть.
*/
struct ReplicatedMergeTreeQuorumEntry
{
String part_name;
size_t required_number_of_replicas;
std::set<String> replicas;
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ReplicatedMergeTreeQuorumEntry() {}
ReplicatedMergeTreeQuorumEntry(const String & str)
{
fromString(str);
}
void writeText(WriteBuffer & out) const
{
out << "version: 1\n"
<< "part_name: " << part_name << "\n"
<< "required_number_of_replicas: " << required_number_of_replicas << "\n"
<< "actual_number_of_replicas: " << replicas.size() << "\n"
<< "replicas:\n";
for (const auto & replica : replicas)
out << escape << replica << "\n";
}
void readText(ReadBuffer & in)
{
size_t actual_number_of_replicas = 0;
in >> "version: 1\n"
>> "part_name: " >> part_name >> "\n"
>> "required_number_of_replicas: " >> required_number_of_replicas >> "\n"
>> "actual_number_of_replicas: " >> actual_number_of_replicas >> "\n"
>> "replicas:\n";
for (size_t i = 0; i < actual_number_of_replicas; ++i)
{
String replica;
in >> escape >> replica >> "\n";
replicas.insert(replica);
}
}
String toString() const
{
String res;
{
WriteBufferFromString out(res);
writeText(out);
}
return res;
}
void fromString(const String & str)
{
ReadBufferFromString in(str);
readText(in);
}
};
}