#include <ValueCache.h>

Public Member Functions
int	getId ()
	Get a unique id for a cached value. More...

CachedScalar	getScalar (int id)
	Get a reference to a CachedValue object representing a scalar (doublereal) with the given id. More...

CachedArray	getArray (int id)
	Get a reference to a CachedValue object representing an array (vector_fp) with the given id. More...

void	clear ()
	Clear all cached values. More...

Protected Attributes
std::map< int, CachedValue < double > >	m_scalarCache
	Cached scalar values. More...

std::map< int, CachedValue < vector_fp > >	m_arrayCache
	Cached array values. More...

Static Protected Attributes
static int	m_last_id = 0
	The last assigned id. Automatically incremented by the getId() method. More...

Detailed Description

Storage for cached values

Stores cached values of properties evaluated at a particular thermodynamic state. A class that needs cached values can have a ValueCache as a member variable.

Each method in the class that implements caching behavior needs a unique id for its cached value. This id should be obtained by using the getId() function to initialize a static variable within the function.

For cases where the property is a scalar or vector, the cached value can be stored in the CachedValue object. If the data type of the cached value is more complex, then it can be stored in the calling class, and the value attribute of the CachedScalar object can be ignored.

An example use of class ValueCache:

class Example {
    ValueCache m_cache;
    doublereal get_property(doublereal T, doublereal P) {
        const static int cacheId = m_cache.getId();
        CachedScalar cached = m_cache.getScalar(cacheId);
        if (T != cached.state1 || P != cached.state2) {
            cached.value = some_expensive_function(T,P);
            cached.state1 = T;
            cached.state2 = P;
        }
        return cached.value;
    }
};

Definition at line 153 of file ValueCache.h.

Member Function Documentation

int getId ( )

Get a unique id for a cached value.

Must be called exactly once for each method that implements caching behavior.

Definition at line 18 of file ValueCache.cpp.

References ValueCache::m_last_id.

Referenced by MaskellSolidSolnPhase::_updateThermo(), IdealGasPhase::_updateThermo(), HMWSoln::A_Debye_TP(), HMWSoln::calcDensity(), HMWSoln::dA_DebyedP_TP(), MaskellSolidSolnPhase::getActivityCoefficients(), HMWSoln::s_update_d2lnMolalityActCoeff_dT2(), HMWSoln::s_update_dlnMolalityActCoeff_dP(), and HMWSoln::s_update_dlnMolalityActCoeff_dT().

CachedScalar getScalar ( int id )

inline

Get a reference to a CachedValue object representing a scalar (doublereal) with the given id.

Definition at line 162 of file ValueCache.h.

References ValueCache::m_scalarCache.

Referenced by MaskellSolidSolnPhase::_updateThermo(), IdealGasPhase::_updateThermo(), HMWSoln::A_Debye_TP(), HMWSoln::calcDensity(), HMWSoln::dA_DebyedP_TP(), HMWSoln::s_update_d2lnMolalityActCoeff_dT2(), HMWSoln::s_update_dlnMolalityActCoeff_dP(), and HMWSoln::s_update_dlnMolalityActCoeff_dT().

CachedArray getArray ( int id )

inline

Get a reference to a CachedValue object representing an array (vector_fp) with the given id.

Definition at line 168 of file ValueCache.h.

References ValueCache::m_arrayCache.

Referenced by MaskellSolidSolnPhase::getActivityCoefficients().

void clear ( )

Clear all cached values.

This method should be called if the cached values may be invalidated in a way that is not represented by the state variables alone, such as a change to the constants defining a species thermodynamics as a function of temperature.

Definition at line 24 of file ValueCache.cpp.

References ValueCache::m_arrayCache, and ValueCache::m_scalarCache.