ClickHouse/dbms/include/DB/Storages/MergeTree/ReplicatedMergeTreeQuorumEntry.h
2015-09-11 05:13:59 +03:00

73 lines
1.7 KiB
C++
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#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;
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);
}
};
}