fsfw/datapoolglob/PoolRawAccess.h
2020-09-06 15:23:38 +02:00

221 lines
7.9 KiB
C++

#ifndef POOLRAWACCESS_H_
#define POOLRAWACCESS_H_
#include "../datapool/DataSetIF.h"
#include "../datapool/PoolEntryIF.h"
#include "../datapool/PoolVariableIF.h"
#include "../globalfunctions/Type.h"
/**
* @brief This class allows accessing Data Pool variables as raw bytes.
* @details
* This is necessary to have an access method for HK data, as the PID's alone
* do not provide type information. Please note that the the raw pool access
* read() and commit() calls are not thread-safe.
*
* Please supply a data set and use the data set read(), commit() calls for
* thread-safe data pool access.
* @ingroup data_pool
*/
class PoolRawAccess: public PoolVariableIF, HasReturnvaluesIF {
public:
/**
* This constructor is used to access a data pool entry with a
* given ID if the target type is not known. A DataSet object is supplied
* and the data pool entry with the given ID is registered to that data set.
* Please note that a pool raw access buffer only has a buffer
* with a size of double. As such, for vector entries which have
* @param data_pool_id Target data pool entry ID
* @param arrayEntry
* @param data_set Dataset to register data pool entry to
* @param setReadWriteMode
* @param registerVectors If set to true, the constructor checks if
* there are multiple vector entries to registers
* and registers all of them recursively into the data_set
*
*/
PoolRawAccess(uint32_t data_pool_id, uint8_t arrayEntry,
DataSetIF* data_set, ReadWriteMode_t setReadWriteMode =
PoolVariableIF::VAR_READ);
/**
* @brief This operation returns a pointer to the entry fetched.
* @details Return pointer to the buffer containing the raw data
* Size and number of data can be retrieved by other means.
*/
uint8_t* getEntry();
/**
* @brief This operation returns the fetched entry from the data pool and
* flips the bytes, if necessary.
* @details It makes use of the getEntry call of this function, but additionally flips the
* bytes to big endian, which is the default for external communication (as House-
* keeping telemetry). To achieve this, the data is copied directly to the passed
* buffer, if it fits in the given max_size.
* @param buffer A pointer to a buffer to write to
* @param writtenBytes The number of bytes written is returned with this value.
* @param max_size The maximum size that the function may write to buffer.
* @return - @c RETURN_OK if entry could be acquired
* - @c RETURN_FAILED else.
*/
ReturnValue_t getEntryEndianSafe(uint8_t *buffer, size_t *size,
size_t maxSize);
/**
* @brief Serialize raw pool entry into provided buffer directly
* @param buffer Provided buffer. Raw pool data will be copied here
* @param size [out] Increment provided size value by serialized size
* @param max_size Maximum allowed serialization size
* @param bigEndian Specify endianess
* @return - @c RETURN_OK if serialization was successfull
* - @c SerializeIF::BUFFER_TOO_SHORT if range check failed
*/
ReturnValue_t serialize(uint8_t **buffer, size_t *size,
size_t maxSize, Endianness streamEndianness) const override;
size_t getSerializedSize() const override;
ReturnValue_t deSerialize(const uint8_t **buffer, size_t *size,
Endianness streamEndianness) override;
/**
* With this method, the content can be set from a big endian buffer safely.
* @param buffer Pointer to the data to set
* @param size Size of the data to write. Must fit this->size.
* @return - @c RETURN_OK on success
* - @c RETURN_FAILED on failure
*/
ReturnValue_t setEntryFromBigEndian(const uint8_t* buffer,
size_t setSize);
/**
* @brief This operation returns the type of the entry currently stored.
*/
Type getType();
/**
* @brief This operation returns the size of the entry currently stored.
*/
size_t getSizeOfType();
/**
*
* @return the size of the datapool array
*/
size_t getArraySize();
/**
* @brief This operation returns the data pool id of the variable.
*/
uint32_t getDataPoolId() const;
static const uint8_t INTERFACE_ID = CLASS_ID::POOL_RAW_ACCESS_CLASS;
static const ReturnValue_t INCORRECT_SIZE = MAKE_RETURN_CODE(0x01);
static const ReturnValue_t DATA_POOL_ACCESS_FAILED = MAKE_RETURN_CODE(0x02);
static const ReturnValue_t READ_TYPE_TOO_LARGE = MAKE_RETURN_CODE(0x03);
static const ReturnValue_t READ_INDEX_TOO_LARGE = MAKE_RETURN_CODE(0x04);
static const ReturnValue_t READ_ENTRY_NON_EXISTENT = MAKE_RETURN_CODE(0x05);
static const uint8_t RAW_MAX_SIZE = sizeof(double);
uint8_t value[RAW_MAX_SIZE];
/**
* @brief The classes destructor is empty. If commit() was not called, the local value is
* discarded and not written back to the data pool.
*/
~PoolRawAccess();
/**
* This method returns if the variable is read-write or read-only.
*/
ReadWriteMode_t getReadWriteMode() const;
/**
* @brief With this call, the valid information of the variable is returned.
*/
bool isValid() const;
void setValid(bool valid);
/**
* Getter for the remaining size.
*/
size_t getSizeTillEnd() const;
/**
* @brief This is a call to read the value 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 the value and the valid
* information to its local attributes. In case of a failure (wrong type or
* pool id not found), the variable is set to zero and invalid.
* The call is protected by a lock of the global data pool.
* @return -@c RETURN_OK Read successfull
* -@c READ_TYPE_TOO_LARGE
* -@c READ_INDEX_TOO_LARGE
* -@c READ_ENTRY_NON_EXISTENT
*/
ReturnValue_t read(uint32_t lockTimeout = MutexIF::BLOCKING) override;
/**
* @brief The commit call writes back the variable's value 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 call is protected by a lock of the global data pool.
*
*/
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;
ReturnValue_t handleReadOut(PoolEntryIF* read_out);
void handleReadError(ReturnValue_t result);
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 array entry that is fetched from the data pool.
*/
uint8_t arrayEntry;
/**
* @brief The valid information as it was stored in the data pool is copied to this attribute.
*/
uint8_t valid;
/**
* @brief This value contains the type of the data pool entry.
*/
Type type;
/**
* @brief This value contains the size of the data pool entry type in bytes.
*/
size_t typeSize;
/**
* The size of the DP array (single values return 1)
*/
size_t arraySize;
/**
* The size (in bytes) from the selected entry till the end of this DataPool variable.
*/
size_t sizeTillEnd;
/**
* @brief The information whether the class is read-write or read-only is stored here.
*/
ReadWriteMode_t readWriteMode;
};
#endif /* POOLRAWACCESS_H_ */