fsfw/datapoolglob/GlobalDataPool.h

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2020-09-06 15:23:38 +02:00
#ifndef GLOBALDATAPOOL_H_
#define GLOBALDATAPOOL_H_
#include "../datapool/PoolEntry.h"
#include "../globalfunctions/Type.h"
#include "../ipc/MutexIF.h"
#include <map>
/**
* @defgroup data_pool Global data pool
* This is the group, where all classes associated with global
* data pool handling belong to.
* This includes classes to access Data Pool variables.
*/
/**
* Typedefs for the global pool representations
*/
using GlobPoolMap = std::map<uint32_t, PoolEntryIF*>;
using GlobPoolMapIter = GlobPoolMap::iterator;
/**
* @brief This class represents the OBSW global data-pool.
*
* @details
* All variables are registered and space is allocated in an initialization
* function, which is passed do the constructor. Space for the variables is
* allocated on the heap (with a new call).
*
* The data is found by a data pool id, which uniquely represents a variable.
* Data pool variables should be used with a blackboard logic in mind,
* which means read data is valid (if flagged so),
* but not necessarily up-to-date.
*
* Variables are either single values or arrays.
* @author Bastian Baetz
* @ingroup data_pool
*/
class GlobalDataPool : public HasReturnvaluesIF {
private:
/**
* @brief This is the actual data pool itself.
* @details It is represented by a map with the data pool id as index
* and a pointer to a single PoolEntry as value.
*/
GlobPoolMap globDataPool;
/**
* @brief The mutex is created in the constructor and makes
* access mutual exclusive.
* @details Locking and unlocking the pool is only done by the DataSet class.
*/
MutexIF* mutex;
public:
/**
* @brief In the classes constructor,
* the passed initialization function is called.
* @details
* To enable filling the pool, a pointer to the map is passed,
* allowing direct access to the pool's content.
* On runtime, adding or removing variables is forbidden.
*/
GlobalDataPool( void ( *initFunction )( GlobPoolMap* pool_map ) );
/**
* @brief The destructor iterates through the data_pool map and
* calls all entries destructors to clean up the heap.
*/
~GlobalDataPool();
/**
* @brief This is the default call to access the pool.
* @details
* A pointer to the PoolEntry object is returned.
* The call checks data pool id, type and array size.
* Returns NULL in case of failure.
* @param data_pool_id The data pool id to search.
* @param sizeOrPosition The array size (not byte size!) of the pool entry,
* or the position the user wants to read.
* If smaller than the entry size, everything's ok.
*/
template <typename T> PoolEntry<T>* getData( uint32_t data_pool_id,
uint8_t sizeOrPosition );
/**
* @brief An alternative call to get a data pool entry in case the type is not implicitly known
* (i.e. in Housekeeping Telemetry).
* @details It returns a basic interface and does NOT perform
* a size check. The caller has to assure he does not copy too much data.
* Returns NULL in case the entry is not found.
* @param data_pool_id The data pool id to search.
*/
PoolEntryIF* getRawData( uint32_t data_pool_id );
/**
* @brief This is a small helper function to facilitate locking the global data pool.
* @details It fetches the pool's mutex id and tries to acquire the mutex.
*/
ReturnValue_t lockDataPool(uint32_t timeoutMs = MutexIF::BLOCKING);
/**
* @brief This is a small helper function to facilitate unlocking the global data pool.
* @details It fetches the pool's mutex id and tries to free the mutex.
*/
ReturnValue_t unlockDataPool();
/**
* @brief The print call is a simple debug method.
* @details It prints the current content of the data pool.
* It iterates through the data_pool map and calls each entry's print() method.
*/
void print();
/**
* Extracts the data pool id from a SCOS 2000 PID.
* @param parameter_id The passed Parameter ID.
* @return The data pool id as used within the OBSW.
*/
static uint32_t PIDToDataPoolId( uint32_t parameter_id );
/**
* Extracts an array index out of a SCOS 2000 PID.
* @param parameter_id The passed Parameter ID.
* @return The index of the corresponding data pool entry.
*/
static uint8_t PIDToArrayIndex( uint32_t parameter_id );
/**
* Retransforms a data pool id and an array index to a SCOS 2000 PID.
*/
static uint32_t poolIdAndPositionToPid( uint32_t poolId, uint8_t index );
/**
* Method to return the type of a pool variable.
* @param parameter_id A parameterID (not pool id) of a DP member.
* @param type Returns the type or TYPE::UNKNOWN_TYPE
* @return RETURN_OK if parameter exists, RETURN_FAILED else.
*/
ReturnValue_t getType( uint32_t parameter_id, Type* type );
/**
* Method to check if a PID exists. Does not lock, as there's no
* possibility to alter the list that is checked during run-time.
* @param parameterId The PID (not pool id!) of a parameter.
* @return true if exists, false else.
*/
bool exists(uint32_t parameterId);
};
//We assume someone globally instantiates a DataPool.
namespace glob {
extern GlobalDataPool dataPool;
}
#endif /* DATAPOOL_H_ */