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65 lines
2.7 KiB
C++
65 lines
2.7 KiB
C++
#ifndef SHARED_EXPRESSION_MODEL_STORE_H
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#define SHARED_EXPRESSION_MODEL_STORE_H
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#include "expression_model_handle.h"
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#include "expiring_pointer.h"
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#include <ion/storage.h>
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#include <assert.h>
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namespace Shared {
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// ExpressionModelStore is a handle to Ion::Storage::sharedStorage()
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class ExpressionModelStore {
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// TODO find better name (once we remove ExpressionModelStore?)
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public:
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ExpressionModelStore();
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// Getters
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// By default, the number of models is not bounded
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virtual int maxNumberOfModels() const { return -1; }
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int numberOfModels() const;
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Ion::Storage::Record recordAtIndex(int i) const;
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int numberOfDefinedModels() const {
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return numberOfModelsSatisfyingTest(&isModelDefined, nullptr);
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}
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Ion::Storage::Record definedRecordAtIndex(int i) const {
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return recordSatisfyingTestAtIndex(i, &isModelDefined, nullptr);
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}
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ExpiringPointer<ExpressionModelHandle> modelForRecord(Ion::Storage::Record record) const { return ExpiringPointer<ExpressionModelHandle>(privateModelForRecord(record)); }
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// Add and Remove
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virtual Ion::Storage::Record::ErrorStatus addEmptyModel() = 0;
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void removeAll();
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void removeModel(Ion::Storage::Record record);
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// Other
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virtual void tidy();
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void storageDidChangeForRecord(const Ion::Storage::Record record) const { resetMemoizedModelsExceptRecord(record); }
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protected:
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constexpr static int k_maxNumberOfMemoizedModels = 10;
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int maxNumberOfMemoizedModels() const { return maxNumberOfModels() < 0 ? k_maxNumberOfMemoizedModels : maxNumberOfModels(); }
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typedef bool (*ModelTest)(ExpressionModelHandle * model, void * context);
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int numberOfModelsSatisfyingTest(ModelTest test, void * context) const;
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Ion::Storage::Record recordSatisfyingTestAtIndex(int i, ModelTest test, void * context) const;
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static bool isModelDefined(ExpressionModelHandle * model, void * context) {
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return model->isDefined();
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}
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ExpressionModelHandle * privateModelForRecord(Ion::Storage::Record record) const;
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private:
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void resetMemoizedModelsExceptRecord(const Ion::Storage::Record record = Ion::Storage::Record()) const;
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virtual ExpressionModelHandle * setMemoizedModelAtIndex(int cacheIndex, Ion::Storage::Record) const = 0;
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virtual ExpressionModelHandle * memoizedModelAtIndex(int cacheIndex) const = 0;
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virtual const char * modelExtension() const = 0;
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/* Memoization of k_maxNumberOfMemoizedModels. When the required model is not
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* present, we override the m_oldestMemoizedIndex model. This actually
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* overrides the oldest memoized model because models are all reset at the
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* same time. Otherwise, we should use a queue to decide which was the last
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* memoized model. */
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mutable int m_oldestMemoizedIndex;
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};
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}
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#endif
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