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datapoollocal/LocalDataSet.h
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187
datapoollocal/LocalDataSet.h
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#ifndef FRAMEWORK_DATAPOOLLOCAL_LOCALDATASET_H_
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#define FRAMEWORK_DATAPOOLLOCAL_LOCALDATASET_H_
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#include <framework/datapool/DataSetIF.h>
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#include <framework/serialize/SerializeIF.h>
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/**
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* @brief The LocalDataSet class manages a set of locally checked out variables
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* for local data pools
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* @details
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* This class manages a list, where a set of local variables (or pool variables)
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* are registered. They are checked-out (i.e. their values are looked
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* up and copied) with the read call. After the user finishes working with the
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* pool variables, he can write back all variable values to the pool with
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* the commit call. The data set manages locking and freeing the local data pools,
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* to ensure thread-safety.
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*
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* An internal state manages usage of this class. Variables may only be
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* registered before the read call is made, and the commit call only
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* after the read call.
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*
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* If pool variables are writable and not committed until destruction
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* of the set, the DataSet class automatically sets the valid flag in the
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* data pool to invalid (without) changing the variable's value.
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*
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* @ingroup data_pool
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*/
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class LocalDataSet:
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public DataSetIF,
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public HasReturnvaluesIF,
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public SerializeIF {
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public:
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static constexpr uint8_t INTERFACE_ID = CLASS_ID::DATA_SET_CLASS;
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static constexpr ReturnValue_t INVALID_PARAMETER_DEFINITION =
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MAKE_RETURN_CODE( 0x01 );
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static constexpr ReturnValue_t SET_WAS_ALREADY_READ = MAKE_RETURN_CODE( 0x02 );
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static constexpr ReturnValue_t COMMITING_WITHOUT_READING =
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MAKE_RETURN_CODE(0x03);
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static constexpr ReturnValue_t DATA_SET_UNINITIALIZED = MAKE_RETURN_CODE( 0x04 );
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static constexpr ReturnValue_t DATA_SET_FULL = MAKE_RETURN_CODE( 0x05 );
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static constexpr ReturnValue_t POOL_VAR_NULL = MAKE_RETURN_CODE( 0x06 );
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/**
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* @brief The constructor simply sets the fill_count to zero and sets
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* the state to "uninitialized".
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*/
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LocalDataSet();
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/**
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* @brief This operation is used to register the local variables in the set.
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* @details It stores the pool variable pointer in a variable list.
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*/
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ReturnValue_t registerVariable(PoolVariableIF* variable) override;
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/**
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* @brief The destructor automatically manages writing the valid
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* information of variables.
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* @details
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* In case the data set was read out, but not committed(indicated by state),
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* the destructor parses all variables that are still registered to the set.
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* For each, the valid flag in the data pool is set to "invalid".
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*/
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~LocalDataSet();
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/**
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* @brief The read call initializes reading out all registered variables.
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* @details
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* It iterates through the list of registered variables and calls all read()
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* functions of the registered pool variables (which read out their values
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* from the data pool) which are not write-only.
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* In case of an error (e.g. a wrong data type, or an invalid data pool id),
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* the operation is aborted and @c INVALID_PARAMETER_DEFINITION returned.
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*
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* The data pool is locked during the whole read operation and
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* freed afterwards.The state changes to "was written" after this operation.
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* @return - @c RETURN_OK if all variables were read successfully.
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* - @c INVALID_PARAMETER_DEFINITION if PID, size or type of the
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* requested variable is invalid.
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* - @c SET_WAS_ALREADY_READ if read() is called twice without
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* calling commit() in between
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*/
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ReturnValue_t read();
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/**
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* @brief The commit call initializes writing back the registered variables.
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* @details
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* It iterates through the list of registered variables and calls the
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* commit() method of the remaining registered variables (which write back
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* their values to the pool).
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*
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* The data pool is locked during the whole commit operation and
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* freed afterwards. The state changes to "was committed" after this operation.
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*
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* If the set does contain at least one variable which is not write-only commit()
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* can only be called after read(). If the set only contains variables which are
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* write only, commit() can be called without a preceding read() call.
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* @return - @c RETURN_OK if all variables were read successfully.
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* - @c COMMITING_WITHOUT_READING if set was not read yet and
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* contains non write-only variables
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*/
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ReturnValue_t commit(void);
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/**
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* Variant of method above which sets validity of all elements of the set.
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* @param valid Validity information from PoolVariableIF.
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* @return - @c RETURN_OK if all variables were read successfully.
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* - @c COMMITING_WITHOUT_READING if set was not read yet and
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* contains non write-only variables
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*/
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ReturnValue_t commit(bool valid);
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/**
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* Set all entries
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* @param valid
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*/
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void setSetValid(bool valid);
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/**
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* Set the valid information of all variables contained in the set which
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* are not read-only
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*
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* @param valid Validity information from PoolVariableIF.
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*/
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void setEntriesValid(bool valid);
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ReturnValue_t serialize(uint8_t** buffer, size_t* size,
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const size_t max_size, bool bigEndian) const override;
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size_t getSerializedSize() const override;
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ReturnValue_t deSerialize(const uint8_t** buffer, size_t* size,
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bool bigEndian) override;
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private:
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// SHOULDDO we could use a linked list of datapool variables
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//! This definition sets the maximum number of variables
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//! to register in one DataSet.
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static const uint8_t DATA_SET_MAX_SIZE = 63;
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/**
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* @brief This array represents all pool variables registered in this set.
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*/
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PoolVariableIF* registeredVariables[DATA_SET_MAX_SIZE];
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/**
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* @brief The fill_count attribute ensures that the variables register in
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* the correct array position and that the maximum number of
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* variables is not exceeded.
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*/
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uint16_t fill_count;
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/**
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* States of the seet.
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*/
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enum States {
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DATA_SET_UNINITIALISED, //!< DATA_SET_UNINITIALISED
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DATA_SET_WAS_READ //!< DATA_SET_WAS_READ
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};
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/**
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* @brief state manages the internal state of the data set,
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* which is important e.g. for the behavior on destruction.
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*/
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States state;
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/**
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* If the valid state of a dataset is always relevant to the whole
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* data set we can use this flag.
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*/
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bool valid = false;
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/**
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* @brief This is a small helper function to facilitate locking
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* the underlying data data pool structure
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* @details
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* It makes use of the lockDataPool method offered by the DataPool class.
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*/
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ReturnValue_t lockDataPool() override;
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/**
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* @brief This is a small helper function to facilitate
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* unlocking the underlying data data pool structure
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* @details
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* It makes use of the freeDataPoolLock method offered by the DataPool class.
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*/
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ReturnValue_t unlockDataPool() override;
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void handleAlreadyReadDatasetCommit();
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ReturnValue_t handleUnreadDatasetCommit();
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};
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#endif /* FRAMEWORK_DATAPOOLLOCAL_LOCALDATASET_H_ */
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