fsfw/datapoollocal/LocalPoolVector.h

#ifndef FSFW_DATAPOOLLOCAL_LOCALPOOLVECTOR_H_
#define FSFW_DATAPOOLLOCAL_LOCALPOOLVECTOR_H_

#include "LocalPoolObjectBase.h"
#include "../datapool/DataSetIF.h"
#include "../datapool/PoolEntry.h"
#include "../datapool/PoolVariableIF.h"
#include "../datapoollocal/LocalDataPoolManager.h"
#include "../serialize/SerializeAdapter.h"
#include "../serviceinterface/ServiceInterfaceStream.h"


/**
 * @brief	This is the access class for array-type data pool entries.
 * @details
 * To ensure safe usage of the data pool, operation is not done directly on the
 * data pool entries, but on local copies. This class provides simple type-
 * and length-safe access to vector-style data pool entries (i.e. entries with
 * length > 1). The class can be instantiated as read-write and read only.
 *
 * It provides a commit-and-roll-back semantic, which means that no array
 * entry in the data pool is changed until the commit call is executed.
 * There are two template parameters:
 * @tparam	T
 * This template parameter specifies the data type of an array entry. Currently,
 * all plain data types are supported, but in principle any type is possible.
 * @tparam  vector_size
 * This template parameter specifies the vector size of this entry. Using a
 * template parameter for this is not perfect, but avoids
 * dynamic memory allocation.
 * @ingroup data_pool
 */
template<typename T, uint16_t vectorSize>
class LocalPoolVector: public LocalPoolObjectBase {
public:
	LocalPoolVector() = 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. This is performed
	 * by the read() operation (which is not thread-safe).
	 * Datasets can be used to access local pool entires in a thread-safe way.
	 * @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.
	 */
	LocalPoolVector(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. This is performed
	 * by the read() operation (which is not thread-safe).
	 * Datasets can be used to access local pool entires in a thread-safe way.
	 * @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.
	 */
	LocalPoolVector(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 unique global identifier of a local pool
	 * vector.
	 * @param globalPoolId
	 * @param dataSet
	 * @param setReadWriteMode
	 */
	LocalPoolVector(gp_id_t globalPoolId,
			DataSetIF* dataSet = nullptr,
			pool_rwm_t setReadWriteMode = pool_rwm_t::VAR_READ_WRITE);

	/**
	 * @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 local
	 * array of this type.
	 */
	T value[vectorSize];
	/**
	 * @brief	The classes destructor is empty.
	 * @details	If commit() was not called, the local value is
	 * 			discarded and not written back to the data pool.
	 */
	~LocalPoolVector() {};
	/**
	 * @brief	The operation returns the number of array entries
	 * 			in this variable.
	 */
	uint8_t getSize() {
		return vectorSize;
	}

	T& operator [](int i);
	const T &operator [](int i) const;

	virtual ReturnValue_t serialize(uint8_t** buffer, size_t* size,
			const size_t maxSize,
			SerializeIF::Endianness streamEndiannes) 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(uint32_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(uint32_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;

private:


	// std::ostream is the type for object std::cout
	template <typename U, uint16_t otherSize>
	friend std::ostream& operator<< (std::ostream &out,
	        const LocalPoolVector<U, otherSize> &var);


};

#include "LocalPoolVector.tpp"

template<typename T, uint16_t vectorSize>
using lp_vec_t = LocalPoolVector<T, vectorSize>;

#endif /* FSFW_DATAPOOLLOCAL_LOCALPOOLVECTOR_H_ */