fsfw/datapoollocal/LocalPoolVariable.h
2020-12-03 13:00:04 +01:00

186 lines
7.0 KiB
C++

#ifndef FSFW_DATAPOOLLOCAL_LOCALPOOLVARIABLE_H_
#define FSFW_DATAPOOLLOCAL_LOCALPOOLVARIABLE_H_
#include "LocalPoolObjectBase.h"
#include "HasLocalDataPoolIF.h"
#include "LocalDataPoolManager.h"
#include "../datapool/PoolVariableIF.h"
#include "../datapool/DataSetIF.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 LocalPoolObjectBase {
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 dataSet The data set in which the variable shall register itself.
* If nullptr, the variable is not registered.
* @param setReadWriteMode Specify the read-write mode of the pool variable.
*/
LocalPoolVar(HasLocalDataPoolIF* hkOwner, lp_id_t poolId,
DataSetIF* dataSet = nullptr,
pool_rwm_t setReadWriteMode = pool_rwm_t::VAR_READ_WRITE);
/**
* 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 dataSet The data set in which the variable shall register itself.
* If nullptr, the variable is not registered.
* @param setReadWriteMode Specify the read-write mode of the pool variable.
*
*/
LocalPoolVar(object_id_t poolOwner, lp_id_t poolId,
DataSetIF* dataSet = nullptr,
pool_rwm_t setReadWriteMode = pool_rwm_t::VAR_READ_WRITE);
/**
* Variation which takes the global unique identifier of a pool variable.
* @param globalPoolId
* @param dataSet
* @param setReadWriteMode
*/
LocalPoolVar(gp_id_t globalPoolId, DataSetIF* dataSet = nullptr,
pool_rwm_t setReadWriteMode = pool_rwm_t::VAR_READ_WRITE);
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;
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;
LocalPoolVar<T> &operator=(const T& newValue);
LocalPoolVar<T> &operator=(const LocalPoolVar<T>& newPoolVariable);
//! Explicit type conversion operator. Allows casting the class to
//! its template type to perform operations on value.
explicit operator T() const;
bool operator==(const LocalPoolVar<T>& other) const;
bool operator==(const T& other) const;
bool operator!=(const LocalPoolVar<T>& other) const;
bool operator!=(const T& other) const;
bool operator<(const LocalPoolVar<T>& other) const;
bool operator<(const T& other) const;
bool operator>(const LocalPoolVar<T>& other) const;
bool operator>(const T& other) const;
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:
};
#include "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 /* FSFW_DATAPOOLLOCAL_LOCALPOOLVARIABLE_H_ */