text: /*********************************************************************************
   *
   * Inviwo - Interactive Visualization Workshop
   *
   * Copyright (c) 2012-2020 Inviwo Foundation
   * All rights reserved.
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   * list of conditions and the following disclaimer.
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   * and/or other materials provided with the distribution.
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  #pragma once
  
  #include <inviwo/core/common/inviwocoredefine.h>
  #include <inviwo/core/network/processornetworkobserver.h>
  #include <inviwo/core/processors/processorobserver.h>
  #include <inviwo/core/network/processornetworkevaluationobserver.h>
  #include <inviwo/core/network/evaluationerrorhandler.h>
  
  namespace inviwo {
  
  class Processor;
  class ProcessorNetwork;
  
  class IVW_CORE_API ProcessorNetworkEvaluator : public ProcessorNetworkObserver,
                                                 public ProcessorObserver,
                                                 public ProcessorNetworkEvaluationObservable {
      friend class Processor;
  
  public:
      ProcessorNetworkEvaluator(ProcessorNetwork* processorNetwork);
      virtual ~ProcessorNetworkEvaluator() = default;
      void setExceptionHandler(EvaluationErrorHandler handler);
  
  private:
      // ProcessorNetworkObserver overrides
      virtual void onProcessorNetworkEvaluateRequest() override;
      virtual void onProcessorNetworkUnlocked() override;
      virtual void onProcessorNetworkDidAddProcessor(Processor* processor) override;
      virtual void onProcessorNetworkDidRemoveProcessor(Processor* processor) override;
      virtual void onProcessorNetworkDidAddConnection(const PortConnection& connection) override;
      virtual void onProcessorNetworkDidRemoveConnection(const PortConnection& connection) override;
  
      // ProcessorObserver overrides
      virtual void onProcessorSinkChanged(Processor*) override;
      virtual void onProcessorActiveConnectionsChanged(Processor*) override;
  
      void requestEvaluate();
      void evaluate();
  
      ProcessorNetwork* processorNetwork_;
      // the sorted list of processors obtained through topological sorting
      std::vector<Processor*> processorsSorted_;
      bool evaulationQueued_;
      EvaluationErrorHandler exceptionHandler_;
  };
  
  }  // namespace inviwo
  