fsfw/datapoolglob/GlobalPoolVector.h

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2020-09-06 15:23:38 +02:00
#ifndef FSFW_DATAPOOLGLOB_GLOBALPOOLVECTOR_H_
#define FSFW_DATAPOOLGLOB_GLOBALPOOLVECTOR_H_
#include "../datapool/DataSetIF.h"
#include "../datapool/PoolEntry.h"
#include "../datapool/PoolVariableIF.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 GlobPoolVector: public PoolVariableIF {
public:
/**
* @brief In the constructor, the variable can register itself in a
* DataSet (if no nullptr is passed).
* @details
* It DOES NOT fetch the current value from the data pool, but sets the
* value attribute to default (0). The value is fetched within the
* read() operation.
* @param set_id
* This is the id in the global data pool this instance of the access
* class corresponds to.
* @param dataSet
* The data set in which the variable shall register itself. If nullptr,
* the variable is not registered.
* @param setWritable
* If this flag is set to true, changes in the value attribute can be
* written back to the data pool, otherwise not.
*/
GlobPoolVector(uint32_t set_id, DataSetIF* set,
ReadWriteMode_t setReadWriteMode);
/**
* @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.
*/
~GlobPoolVector() {};
/**
* @brief The operation returns the number of array entries
* in this variable.
*/
uint8_t getSize() {
return vectorSize;
}
/**
* @brief This operation returns the data pool id of the variable.
*/
uint32_t getDataPoolId() const {
return dataPoolId;
}
/**
* @brief This operation sets the data pool id of the variable.
* @details
* The method is necessary to set id's of data pool member variables
* with bad initialization.
*/
void setDataPoolId(uint32_t poolId) {
dataPoolId = poolId;
}
/**
* This method returns if the variable is write-only, read-write or read-only.
*/
ReadWriteMode_t getReadWriteMode() const {
return readWriteMode;
}
/**
* @brief With this call, the valid information of the variable is returned.
*/
bool isValid() const {
if (valid != INVALID)
return true;
else
return false;
}
void setValid(bool valid) {this->valid = valid;}
uint8_t getValid() {return valid;}
T &operator [](int i) {return value[i];}
const T &operator [](int i) const {return value[i];}
virtual ReturnValue_t serialize(uint8_t** buffer, size_t* size,
size_t max_size, Endianness streamEndianness) const override;
virtual size_t getSerializedSize() const override;
virtual ReturnValue_t deSerialize(const uint8_t** buffer, size_t* size,
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 global 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 by a lock of the global data pool.
* 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 valid flag is automatically set to "valid".
* The commit call is protected by a lock of the global data pool.
* 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:
/**
* @brief To access the correct data pool entry on read and commit calls,
* the data pool id is stored.
*/
uint32_t dataPoolId;
/**
* @brief The valid information as it was stored in the data pool
* is copied to this attribute.
*/
uint8_t valid;
/**
* @brief The information whether the class is read-write or
* read-only is stored here.
*/
ReadWriteMode_t readWriteMode;
};
#include "../datapoolglob/GlobalPoolVector.tpp"
template<typename T, uint16_t vectorSize>
using gp_vec_t = GlobPoolVector<T, vectorSize>;
#endif /* FSFW_DATAPOOLGLOB_GLOBALPOOLVECTOR_H_ */