CopyRegisterDecorator.h

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// SPDX-FileCopyrightText: Deutsches Elektronen-Synchrotron DESY, MSK, ChimeraTK Project <chimeratk-support@desy.de>
// SPDX-License-Identifier: LGPL-3.0-or-later
#pragma once
 
#include "NDRegisterAccessorDecorator.h"
#include "TransferElement.h"
 
namespace ChimeraTK {
 
  struct CopyRegisterDecoratorTrait {};
 
  template<typename T>
  struct CopyRegisterDecorator : ChimeraTK::NDRegisterAccessorDecorator<T>, CopyRegisterDecoratorTrait {
    explicit CopyRegisterDecorator(const boost::shared_ptr<ChimeraTK::NDRegisterAccessor<T>>& target)
    : ChimeraTK::NDRegisterAccessorDecorator<T>(target) {
      if(!target->isReadable()) {
        throw ChimeraTK::logic_error("ChimeraTK::CopyRegisterDecorator: Target accessor is not readable.");
      }
    }
 
    void doPreRead(TransferType) override {
      // Do nothing. This should only ever be called from the TransferGroup which has already handled
      // the preRead differently
    }
 
    void doPreWrite(TransferType, VersionNumber) override {
      throw ChimeraTK::logic_error("ChimeraTK::CopyRegisterDecorator: Accessor is not writeable.");
    }
 
    void doPostRead(TransferType type, bool hasNewData) override {
      _target->postRead(type, hasNewData);
      if(hasNewData) {
        for(size_t i = 0; i < _target->getNumberOfChannels(); ++i) buffer_2D[i] = _target->accessChannel(i);
      }
    }
 
    void doReadTransferSynchronously() {
      std::cerr << "CopyRegisterDecorator::doReadTransferSynchronously: Must not be called" << std::endl;
      assert(false);
    }
 
    [[nodiscard]] bool isReadOnly() const override { return true; }
 
    [[nodiscard]] bool isWriteable() const override { return false; }
 
    using ChimeraTK::NDRegisterAccessorDecorator<T>::_target;
    using ChimeraTK::NDRegisterAccessorDecorator<T>::buffer_2D;
  };
 
} // namespace ChimeraTK