com_patterns.h

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/********************************************************************************
 * Copyright (C) 2017-2020 German Aerospace Center (DLR). 
 * Eclipse ADORe, Automated Driving Open Research https://eclipse.org/adore
 *
 * This program and the accompanying materials are made available under the 
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0 
 *
 * Contributors: 
 *   Daniel Heß - initial API and implementation
 *   Matthias Nichting - added class AFeedWithCallback
 ********************************************************************************/
 
#pragma once
#include <functional>
#include <string>
 
namespace adore
{
    namespace mad
    {
        template<typename T>
        class AFeed
        {
            public:
            virtual bool hasNext() const =0;
            virtual void getNext(T& value)=0; 
            virtual void getLatest(T& value)=0;
        };
        template<typename T>
        class AFeedWithCallback
        {
            public:
            virtual bool hasNext() const =0;
            virtual void setCallback(std::function<void()> fcn) = 0;
            virtual void getNext(T& value)=0; 
            virtual void getLatest(T& value)=0;
        };
 
        template<typename T>
        class AReader
        {
            public:
            virtual bool hasData() const=0;
            virtual bool hasUpdate() const=0;
            virtual void getData(T& value) =0;
            virtual std::string getDesc()
            {
                return std::string(typeid(T).name());
            }
        };
 
        template<typename T>
        class AWriter
        {
            public:
            virtual bool canWriteMore() const =0;
            virtual void write(const T& value)=0;
            virtual std::string getDesc()
            {
                return std::string(typeid(T).name());
            }
            virtual uint32_t getNumberOfSubscribers() const
            {
                return 0;
            }
        };
        
        template<typename T>
        class ALocalObserver
        {
            protected:
            AFeed<T> * feed_;
 
            public:
            virtual void update() = 0;
            
            virtual void discard_radius_based(double x, double y, double z, double radius) = 0;
            
            public:
            
            virtual void addFeed(AFeed<T> * feed) = 0;
        };
    }
}