ClickHouse/libs/libzkutil/include/zkutil/KeeperException.h
2016-07-12 13:41:37 +03:00

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#pragma once
#include <DB/Common/Exception.h>
#include <zkutil/Types.h>
#include <DB/Common/ProfileEvents.h>
namespace DB
{
namespace ErrorCodes
{
extern const int KEEPER_EXCEPTION;
}
}
namespace zkutil
{
class KeeperException : public DB::Exception
{
private:
/// delegate constructor, used to minimize repetition; last parameter used for overload resolution
KeeperException(const std::string & msg, const int32_t code, int)
: DB::Exception(msg, DB::ErrorCodes::KEEPER_EXCEPTION), code(code) { incrementEventCounter(); }
public:
KeeperException(const std::string & msg) : KeeperException(msg, ZOK, 0) {}
KeeperException(const std::string & msg, const int32_t code)
: KeeperException(msg + " (" + zerror(code) + ")", code, 0) {}
KeeperException(const int32_t code) : KeeperException(zerror(code), code, 0) {}
KeeperException(const int32_t code, const std::string & path)
: KeeperException(std::string{zerror(code)} + ", path: " + path, code, 0) {}
KeeperException(const KeeperException & exc) : DB::Exception(exc), code(exc.code) { incrementEventCounter(); }
const char * name() const throw() { return "zkutil::KeeperException"; }
const char * className() const throw() { return "zkutil::KeeperException"; }
KeeperException * clone() const { return new KeeperException(*this); }
/// при этих ошибках надо переинициализировать сессию с zookeeper
bool isUnrecoverable() const
{
return code == ZINVALIDSTATE || code == ZSESSIONEXPIRED || code == ZSESSIONMOVED;
}
/// любая ошибка связанная с работой сети, перевыбором мастера
/// при этих ошибках надо либо повторить запрос повторно, либо переинициализировать сессию (см. isUnrecoverable())
bool isHardwareError() const
{
return isUnrecoverable() || code == ZCONNECTIONLOSS || code == ZOPERATIONTIMEOUT;
}
bool isTemporaryError() const
{
return code == ZCONNECTIONLOSS || code == ZOPERATIONTIMEOUT;
}
const int32_t code;
private:
static void incrementEventCounter()
{
ProfileEvents::increment(ProfileEvents::ZooKeeperExceptions);
}
};
};