102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
#include "precomp.h"
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#include "fsdiag.h"
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DEBUG_FILEZONE(ZONE_T120_MCSNC);
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/*
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* randchnl.cpp
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*
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* Copyright (c) 1995 by DataBeam Corporation, Lexington, KY
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*
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* Abstract:
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* This is the implementation file for the RandomChannelGenerator class,
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* which inherits from the RandomNumberGenerator class. On instantiation,
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* instances of this class will internally generate a random number which
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* falls within the allowable range of dynamic channels values. Channel
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* assignments are then generated by incrementing this value each time a
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* new assignment is requested. Once the maximum allowable value has been
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* assigned, the next value to be generated "wraps around" to the minimum
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* allowable value.
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*
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* Obviously, this class does not generate completely random channel
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* values for each request. With a completely random generator, it is
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* possible to delete a channel in MCS, and then have the random number
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* generator assign the same value as the deleted channel before all
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* components of the system even know that the channel was deleted to
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* start with, thus causing erratic behavior in the system. In this
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* class, no channel can be reassigned until all other possible channels
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* have been assigned.
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*
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* This class can be modifed in the future to incorporate additional
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* "randomness" into the algorithm and still not reassign any channel
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* numbers before all other possible values are used. This, however,
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* would be at the expense of performance and/or memory resources.
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*
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* Caveats:
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* None.
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*
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* Author:
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* Alan D. May
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*/
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#include "randchnl.h"
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/*
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* These macros define the mimimum and maximum allowable dynamic channel
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* values.
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*/
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#define MINIMUM_DYNAMIC_CHANNEL 1001
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#define MAXIMUM_DYNAMIC_CHANNEL 65535
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/*
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* RandomChannelGenerator ()
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*
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* Public
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*
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* Functional Description:
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* This version of the constructor is used to create a random channel
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* generator object that has been automatically seeded with the current
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* time.
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*/
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RandomChannelGenerator::RandomChannelGenerator()
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{
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Current_Channel = (GetTickCount() % (MAXIMUM_DYNAMIC_CHANNEL + 1 - MINIMUM_DYNAMIC_CHANNEL)) + MINIMUM_DYNAMIC_CHANNEL;
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}
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/*
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* ~RandomChannelGenerator ()
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*
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* Public
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*
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* Functional Description:
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* This is the destructor for the RandomChannelGenerator class.
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*/
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RandomChannelGenerator::~RandomChannelGenerator ()
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{
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}
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/*
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* GetRandomChannel ()
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*
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* Public
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*
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* Functional Description:
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* This method returns a valid dynamic channel number.
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*/
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RandomValue RandomChannelGenerator::GetRandomChannel (Void)
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{
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/*
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* Increment the current channel value.
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*/
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++Current_Channel;
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/*
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* Determine if the current channel value needs to wrap around.
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*/ if (Current_Channel > MAXIMUM_DYNAMIC_CHANNEL)
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{
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Current_Channel = MINIMUM_DYNAMIC_CHANNEL;
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}
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/*
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* Return the current channel value.
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*/
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return (Current_Channel);
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}
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