mirror of
https://github.com/pocoproject/poco.git
synced 2024-12-13 10:32:57 +01:00
f24547cdcf
* enh(poco): Replace deprecated comments with C++ deprecated attribute. * enh(Poco): Replace some deprecated functionality in Poco sources. (#4426) * enh(Poco): Replace more deprecated functionality in Poco sources. (#4426) * fix(CMake): Variable BUILD_SHARED_LIBS must be defined properly to create valid binaries. * enh: Code improvements done while resolving deprecated functionality (#4426) * Un-deprecate LocalDateTme (#4426) * enh(Poco): Replace usage of deprecated functionality with other functions/classes (#4426) * chore(SSL): temporarily un-deprecate SSL-related functionality (#4426) * chore(SSL): temporarily un-deprecate old MongoDB protocol functionality (#4426) * enh(Poco): Minor Hash improvements (#4426) * enh(Foundation): Compile deprecated hash tests only when POCO_TEST_DEPRECATED is enabled (#4426) * enh(Net): Compile deprecated Socket::select functionality only when POCO_TEST_DEPRECATED is enabled (#4426) * enh(Bonjour): Replace deprecated Socket::select with PollSet (#4426) * enh(Poco): Introduce POCO_DEPRECATED macro to have the ability to disable deprecation warnings in applications (#4426) * test(ODBC): add few asserts to testStoredProcedureDynamicVar * fix(ODBC): rename DynamicAny -> DynamicVar in tests * fix(ODBC): make Dignostics static members inline to prevent explicit instantiation warnings on windows --------- Co-authored-by: Alex Fabijanic <alex@pocoproject.org>
127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
//
|
|
// HashStatistic.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Hashing
|
|
// Module: HashStatistic
|
|
//
|
|
// Definition of the HashStatistic class.
|
|
//
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_HashStatistic_INCLUDED
|
|
#define Foundation_HashStatistic_INCLUDED
|
|
|
|
|
|
#include "Poco/Foundation.h"
|
|
#include <vector>
|
|
|
|
|
|
namespace Poco {
|
|
|
|
class POCO_DEPRECATED("") HashStatistic;
|
|
|
|
class Foundation_API HashStatistic
|
|
/// HashStatistic class bundles statistical information on the current state of a HashTable
|
|
{
|
|
public:
|
|
HashStatistic(
|
|
UInt32 tableSize,
|
|
UInt32 numEntries,
|
|
UInt32 numZeroEntries,
|
|
UInt32 maxEntry,
|
|
std::vector<UInt32> details = std::vector<UInt32>());
|
|
/// Creates the HashStatistic.
|
|
|
|
virtual ~HashStatistic();
|
|
/// Destroys the HashStatistic.
|
|
|
|
UInt32 maxPositionsOfTable() const;
|
|
/// Returns the maximum number of different hash values possible for the table
|
|
|
|
UInt32 numberOfEntries() const;
|
|
/// Returns the total number of entries currently stored in the HashTable
|
|
|
|
UInt32 numberOfZeroPositions() const;
|
|
/// Returns the number of hash positions that contain no entry.
|
|
|
|
double avgEntriesPerHash() const;
|
|
/// Returns the average number of entries per position in the Hashtable, the higher this value the less efficient
|
|
/// performs hashing. If a large value is returned and getNumberOfZeroPositions also returns a large value, this
|
|
/// indicates an inefficient hashing function. If the number of zero entries is low, resizing the HashTable, should
|
|
/// be enough to improve performance
|
|
|
|
double avgEntriesPerHashExclZeroEntries() const;
|
|
/// Same as getAvgEntriesPerHash but hash values that contain no entry are ignored,
|
|
/// getAvgEntriesPerHashExclZeroEntries >= getAvgEntriesPerHash will always be true.
|
|
|
|
UInt32 maxEntriesPerHash() const;
|
|
/// Returns the maximum number of entries per hash value found in the current table.
|
|
|
|
const std::vector<UInt32> detailedEntriesPerHash() const;
|
|
/// Will either be an empty vector or will contain for each possible hash value, the number of entries currently stored
|
|
|
|
std::string toString() const;
|
|
/// Converts the whole data structure into a string.
|
|
|
|
private:
|
|
UInt32 _sizeOfTable;
|
|
UInt32 _numberOfEntries;
|
|
UInt32 _numZeroEntries;
|
|
UInt32 _maxEntriesPerHash;
|
|
std::vector<UInt32> _detailedEntriesPerHash;
|
|
};
|
|
|
|
|
|
inline UInt32 HashStatistic::maxPositionsOfTable() const
|
|
{
|
|
return _sizeOfTable;
|
|
}
|
|
|
|
|
|
inline UInt32 HashStatistic::numberOfEntries() const
|
|
{
|
|
return _numberOfEntries;
|
|
}
|
|
|
|
|
|
inline UInt32 HashStatistic::numberOfZeroPositions() const
|
|
{
|
|
return _numZeroEntries;
|
|
}
|
|
|
|
|
|
inline double HashStatistic::avgEntriesPerHash() const
|
|
{
|
|
return ((double) numberOfEntries()) / maxPositionsOfTable();
|
|
}
|
|
|
|
|
|
inline double HashStatistic::avgEntriesPerHashExclZeroEntries() const
|
|
{
|
|
return ((double) numberOfEntries()) / (maxPositionsOfTable() - numberOfZeroPositions());
|
|
}
|
|
|
|
|
|
inline UInt32 HashStatistic::maxEntriesPerHash() const
|
|
{
|
|
return _maxEntriesPerHash;
|
|
}
|
|
|
|
|
|
inline const std::vector<UInt32> HashStatistic::detailedEntriesPerHash() const
|
|
{
|
|
return _detailedEntriesPerHash;
|
|
}
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_HashStatistic_INCLUDED
|