118 lines
4.3 KiB
C++
118 lines
4.3 KiB
C++
#ifndef TCDISTRIBUTOR_H_
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#define TCDISTRIBUTOR_H_
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#include <framework/objectmanager/ObjectManagerIF.h>
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#include <framework/objectmanager/SystemObject.h>
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#include <framework/osal/OperatingSystemIF.h>
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#include <framework/returnvalues/HasReturnvaluesIF.h>
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#include <framework/storagemanager/StorageManagerIF.h>
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#include <framework/tasks/ExecutableObjectIF.h>
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#include <framework/tmtcservices/TmTcMessage.h>
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#include <framework/ipc/MessageQueueIF.h>
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#include <map>
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/**
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* \defgroup tc_distribution Telecommand Distribution
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* All classes associated with Routing and Distribution of Telecommands belong to this group.
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*/
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/**
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* This typedef simplifies writing down the \c map iterator.
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*/
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typedef std::map<uint32_t, MessageQueueId_t>::iterator iterator_t;
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/**
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* This is the base class to implement distributors for Space Packets.
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* Typically, the distribution is required to forward Telecommand packets
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* over the satellite applications and services. The class receives
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* Space Packets over a message queue and holds a map that links other
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* message queue ids to some identifier. The process of unpacking the
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* destination information from the packet is handled by the child class
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* implementations.
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* \ingroup tc_distribution
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*/
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class TcDistributor : public SystemObject, public ExecutableObjectIF, public HasReturnvaluesIF {
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private:
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/**
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* This constant sets the maximum number of packets distributed per call.
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*/
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static const uint8_t DISTRIBUTER_MAX_PACKETS = 128;
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protected:
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/**
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* This is the receiving queue for incoming Telecommands.
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* The child classes must make its queue id public.
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*/
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MessageQueueIF* tcQueue;
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/**
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* The last received incoming packet information is stored in this
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* member.
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* As different child classes unpack the incoming packet differently
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* (i.e. as a CCSDS Space Packet or as a PUS Telecommand Packet), it
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* is not tried to unpack the packet information within this class.
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*/
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TmTcMessage currentMessage;
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/**
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* The map that links certain packet information to a destination.
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* The packet information may be the APID of the packet or the service
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* identifier. Filling of the map is under control of the different child
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* classes.
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*/
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std::map<uint32_t, MessageQueueId_t> queueMap;
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/**
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* This method shall unpack the routing information from the incoming
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* packet and select the map entry which represents the packet's target.
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* @return An iterator to the map element to forward to or queuMap.end().
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*/
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virtual iterator_t selectDestination() = 0;
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/**
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* The handlePacket method calls the child class's selectDestination method
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* and forwards the packet to its destination, if found.
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* @return The message queue return value or \c RETURN_FAILED, in case no
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* destination was found.
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*/
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ReturnValue_t handlePacket();
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/**
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* This method gives the child class a chance to perform some kind of operation
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* after the parent tried to forward the message.
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* A typically application would be sending success/failure messages.
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* The default implementation just returns \c RETURN_OK.
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* @param queueStatus The status of the message queue after an attempt to send the TC.
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* @return - \c RETURN_OK on success
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* - \c RETURN_FAILED on failure
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*/
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virtual ReturnValue_t callbackAfterSending( ReturnValue_t queueStatus );
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public:
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static const uint8_t INTERFACE_ID = CLASS_ID::PACKET_DISTRIBUTION;
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static const ReturnValue_t PACKET_LOST = MAKE_RETURN_CODE( 1 );
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static const ReturnValue_t DESTINATION_NOT_FOUND = MAKE_RETURN_CODE( 2 );
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/**
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* Within the default constructor, the SystemObject id is set and the
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* message queue is initialized.
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* Filling the map is under control of the child classes.
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* @param set_object_id This id is assigned to the distributor
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* implementation.
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*/
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TcDistributor( object_id_t set_object_id );
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/**
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* The destructor is empty, the message queues are not in the vicinity of
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* this class.
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*/
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virtual ~TcDistributor();
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/**
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* The method is called cyclically and fetches new incoming packets from
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* the message queue.
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* In case a new packet is found, it calls the handlePacket method to deal
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* with distribution.
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* @return The error code of the message queue call.
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*/
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ReturnValue_t performOperation(uint8_t opCode);
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/**
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* A simple debug print, that prints all distribution information stored in
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* queueMap.
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*/
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void print();
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};
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#endif /* TCDISTRIBUTOR_H_ */
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