fsfw/tcdistribution/TcDistributor.h
2020-08-13 20:53:35 +02:00

117 lines
4.2 KiB
C++

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