fsfw/datapoollocal/LocalPoolVariable.h

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2020-08-18 13:09:15 +02:00
#ifndef FRAMEWORK_DATAPOOLLOCAL_LOCALPOOLVARIABLE_H_
#define FRAMEWORK_DATAPOOLLOCAL_LOCALPOOLVARIABLE_H_
#include "../datapool/PoolVariableIF.h"
#include "../datapool/DataSetIF.h"
#include "../datapoollocal/HasLocalDataPoolIF.h"
#include "../datapoollocal/LocalDataPoolManager.h"
#include "../objectmanager/ObjectManagerIF.h"
#include "../serialize/SerializeAdapter.h"
/**
* @brief Local Pool Variable class which is used to access the local pools.
* @details
* This class is not stored in the map. Instead, it is used to access
* the pool entries by using a pointer to the map storing the pool
* entries. It can also be used to organize these pool entries into data sets.
*
* @tparam T The template parameter sets the type of the variable. Currently,
* all plain data types are supported, but in principle any type is possible.
* @ingroup data_pool
*/
template<typename T>
class LocalPoolVar: public PoolVariableIF, HasReturnvaluesIF {
public:
//! Default ctor is forbidden.
LocalPoolVar() = delete;
/**
* This constructor is used by the data creators to have pool variable
* instances which can also be stored in datasets.
*
* It does not fetch the current value from the data pool, which
* has to be done by calling the read() operation.
* Datasets can be used to access multiple local pool entries in an
* efficient way. A pointer to a dataset can be passed to register
* the pool variable in that dataset directly.
* @param poolId ID of the local pool entry.
* @param hkOwner Pointer of the owner. This will generally be the calling
* class itself which passes "this".
* @param setReadWriteMode Specify the read-write mode of the pool variable.
* @param dataSet The data set in which the variable shall register itself.
* If nullptr, the variable is not registered.
*/
LocalPoolVar(lp_id_t poolId, HasLocalDataPoolIF* hkOwner,
pool_rwm_t setReadWriteMode = pool_rwm_t::VAR_READ_WRITE,
DataSetIF* dataSet = nullptr);
/**
* This constructor is used by data users like controllers to have
* access to the local pool variables of data creators by supplying
* the respective creator object ID.
*
* It does not fetch the current value from the data pool, which
* has to be done by calling the read() operation.
* Datasets can be used to access multiple local pool entries in an
* efficient way. A pointer to a dataset can be passed to register
* the pool variable in that dataset directly.
* @param poolId ID of the local pool entry.
* @param hkOwner object ID of the pool owner.
* @param setReadWriteMode Specify the read-write mode of the pool variable.
* @param dataSet The data set in which the variable shall register itself.
* If nullptr, the variable is not registered.
*/
LocalPoolVar(lp_id_t poolId, object_id_t poolOwner,
pool_rwm_t setReadWriteMode = pool_rwm_t::VAR_READ_WRITE,
DataSetIF* dataSet = nullptr);
virtual~ LocalPoolVar() {};
/**
* @brief This is the local copy of the data pool entry.
* @details The user can work on this attribute
* just like he would on a simple local variable.
*/
T value = 0;
pool_rwm_t getReadWriteMode() const override;
lp_id_t getDataPoolId() const override;
void setDataPoolId(lp_id_t poolId);
bool isValid() const override;
void setValid(bool validity) override;
uint8_t getValid() const;
ReturnValue_t serialize(uint8_t** buffer, size_t* size, size_t maxSize,
SerializeIF::Endianness streamEndianness) const override;
virtual size_t getSerializedSize() const override;
virtual ReturnValue_t deSerialize(const uint8_t** buffer, size_t* size,
SerializeIF::Endianness streamEndianness) override;
/**
* @brief This is a call to read the array's values
* from the global data pool.
* @details
* When executed, this operation tries to fetch the pool entry with matching
* data pool id from the data pool and copies all array values and the valid
* information to its local attributes.
* In case of a failure (wrong type, size or pool id not found), the
* variable is set to zero and invalid.
* The read call is protected with a lock.
* It is recommended to use DataSets to read and commit multiple variables
* at once to avoid the overhead of unnecessary lock und unlock operations.
*
*/
ReturnValue_t read(dur_millis_t lockTimeout = MutexIF::BLOCKING) override;
/**
* @brief The commit call copies the array values back to the data pool.
* @details
* It checks type and size, as well as if the variable is writable. If so,
* the value is copied and the local valid flag is written back as well.
* The read call is protected with a lock.
* It is recommended to use DataSets to read and commit multiple variables
* at once to avoid the overhead of unnecessary lock und unlock operations.
*/
ReturnValue_t commit(dur_millis_t lockTimeout = MutexIF::BLOCKING) override;
protected:
/**
* @brief Like #read, but without a lock protection of the global pool.
* @details
* The operation does NOT provide any mutual exclusive protection by itself.
* This can be used if the lock is handled externally to avoid the overhead
* of consecutive lock und unlock operations.
* Declared protected to discourage free public usage.
*/
ReturnValue_t readWithoutLock() override;
/**
* @brief Like #commit, but without a lock protection of the global pool.
* @details
* The operation does NOT provide any mutual exclusive protection by itself.
* This can be used if the lock is handled externally to avoid the overhead
* of consecutive lock und unlock operations.
* Declared protected to discourage free public usage.
*/
ReturnValue_t commitWithoutLock() override;
// std::ostream is the type for object std::cout
template <typename U>
friend std::ostream& operator<< (std::ostream &out,
const LocalPoolVar<U> &var);
private:
//! @brief Pool ID of pool entry inside the used local pool.
lp_id_t localPoolId = PoolVariableIF::NO_PARAMETER;
//! @brief Read-write mode of the pool variable
pool_rwm_t readWriteMode = pool_rwm_t::VAR_READ_WRITE;
//! @brief Specifies whether the entry is valid or invalid.
bool valid = false;
//! Pointer to the class which manages the HK pool.
LocalDataPoolManager* hkManager;
};
#include "../datapoollocal/LocalPoolVariable.tpp"
template<class T>
using lp_var_t = LocalPoolVar<T>;
using lp_bool_t = LocalPoolVar<uint8_t>;
using lp_uint8_t = LocalPoolVar<uint8_t>;
using lp_uint16_t = LocalPoolVar<uint16_t>;
using lp_uint32_t = LocalPoolVar<uint32_t>;
using lp_uint64_t = LocalPoolVar<uint64_t>;
using lp_int8_t = LocalPoolVar<int8_t>;
using lp_int16_t = LocalPoolVar<int16_t>;
using lp_int32_t = LocalPoolVar<int32_t>;
using lp_int64_t = LocalPoolVar<int64_t>;
using lp_float_t = LocalPoolVar<float>;
using lp_double_t = LocalPoolVar<double>;
#endif