mirror of https://gitee.com/bigwinds/arangodb
181 lines
6.1 KiB
C++
181 lines
6.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
/// DISCLAIMER
|
|
///
|
|
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
|
|
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
|
|
///
|
|
/// Licensed under the Apache License, Version 2.0 (the "License");
|
|
/// you may not use this file except in compliance with the License.
|
|
/// You may obtain a copy of the License at
|
|
///
|
|
/// http://www.apache.org/licenses/LICENSE-2.0
|
|
///
|
|
/// Unless required by applicable law or agreed to in writing, software
|
|
/// distributed under the License is distributed on an "AS IS" BASIS,
|
|
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
/// See the License for the specific language governing permissions and
|
|
/// limitations under the License.
|
|
///
|
|
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
|
|
///
|
|
/// @author Dr. Frank Celler
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef LIB_BASICS_RANDOM_GENERATOR_H
|
|
#define LIB_BASICS_RANDOM_GENERATOR_H 1
|
|
|
|
#include "Basics/Common.h"
|
|
|
|
#ifdef _WIN32
|
|
#include <Wincrypt.h>
|
|
#endif
|
|
|
|
namespace arangodb {
|
|
namespace basics {
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief collection of random functions and classes
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
namespace Random {
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief type of the random generator
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
enum random_e {
|
|
RAND_MERSENNE = 1,
|
|
RAND_RANDOM = 2,
|
|
RAND_URANDOM = 3,
|
|
RAND_COMBINED = 4,
|
|
RAND_WIN32 = 5 // uses the built in cryptographic services offered and
|
|
// recommended by microsoft (e.g. CryptGenKey(...) )
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief randomize random
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
void seed();
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief selects random generator
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
random_e selectVersion(random_e);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief returns random generator version
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
random_e currentVersion();
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief static destructor for all allocated rngs. frees file descriptors
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
void shutdown();
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief returns true if random generator might block
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
bool isBlocking();
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief interval inclusive both margins
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
int32_t interval(int32_t left, int32_t right);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief interval inclusive both margins
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
uint32_t interval(uint32_t left, uint32_t right);
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// uniform integer generator
|
|
// -----------------------------------------------------------------------------
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief constructor, the range includes both left and right
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
class UniformInteger {
|
|
private:
|
|
UniformInteger(UniformInteger const&);
|
|
UniformInteger& operator=(UniformInteger const&);
|
|
|
|
public:
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief constructor, the range includes both margins
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
UniformInteger(int32_t left, int32_t right) : left(left), right(right) {}
|
|
|
|
public:
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief returns a random integer between left and right inclusive
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
int32_t random();
|
|
|
|
private:
|
|
int32_t left;
|
|
int32_t right;
|
|
};
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// uniform character generator
|
|
// -----------------------------------------------------------------------------
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @ingroup Utilities
|
|
/// @brief uniform character string
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
class UniformCharacter {
|
|
private:
|
|
UniformCharacter(UniformCharacter const&);
|
|
UniformCharacter& operator=(UniformCharacter const&);
|
|
|
|
public:
|
|
explicit UniformCharacter(size_t length);
|
|
|
|
explicit UniformCharacter(std::string const& characters);
|
|
|
|
UniformCharacter(size_t length, std::string const& characters);
|
|
|
|
public:
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief returns a random string of fixed length
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
std::string random();
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
/// @brief returns a random string of given length
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
std::string random(size_t length);
|
|
|
|
private:
|
|
size_t length;
|
|
std::string const characters;
|
|
UniformInteger generator;
|
|
};
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|