dataManagerBasedSubExecutor.h

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//
// Copyright 2025 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_EXEC_VDF_DATA_MANAGER_BASED_SUB_EXECUTOR_H
#define PXR_EXEC_VDF_DATA_MANAGER_BASED_SUB_EXECUTOR_H
 
 
#include "pxr/pxr.h"
 
#include "pxr/exec/vdf/connection.h"
#include "pxr/exec/vdf/dataManagerBasedExecutor.h"
#include "pxr/exec/vdf/executionStats.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class VdfNode;
 
 
template < typename DataManagerType, typename BaseClass >
class VdfDataManagerBasedSubExecutor :
    public VdfDataManagerBasedExecutor < DataManagerType, BaseClass >
{
    // Base type definition
    typedef VdfDataManagerBasedExecutor<DataManagerType, BaseClass> Base;
 
public:
 
    VdfDataManagerBasedSubExecutor() {}
 
    explicit VdfDataManagerBasedSubExecutor(
        const VdfExecutorInterface *parentExecutor) :
        Base(parentExecutor)
    {}
 
    virtual ~VdfDataManagerBasedSubExecutor() {}
 
protected:
 
    virtual const VdfVector *_GetInputValue(
        const VdfConnection &connection,
        const VdfMask &mask) const override {
        // Lookup the output value in the local data manager, first!
        if (const VdfVector *data = 
                Base::_dataManager.GetInputValue(connection, mask)) {
            return data;
        }
 
        // If available, also check the parent executor for the output value.
        return _GetParentExecutorValue(connection.GetSourceOutput(), mask);
    }
 
    virtual const VdfVector *_GetOutputValueForReading(
        const VdfOutput &output,
        const VdfMask &mask ) const override {
        // Lookup the output value in the local data manager, first!
        if (const VdfVector *data = 
                Base::_dataManager.GetOutputValueForReading(
                    Base::_dataManager.GetDataHandle(output.GetId()), mask)) {
            return data;
        }
        
        // If available, also check the parent executor for the output value.
        return _GetParentExecutorValue(output, mask);
    }
 
private:
 
    // Query the parent executor for an output value.
    const VdfVector *_GetParentExecutorValue(
        const VdfOutput &output,
        const VdfMask &mask) const {
        const VdfExecutorInterface *parentExecutor = Base::GetParentExecutor();
        return parentExecutor
            ? parentExecutor->GetOutputValue(output, mask)
            : nullptr;
    }
 
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif