160 lines
6.4 KiB
C++
160 lines
6.4 KiB
C++
/*
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* \file DataSet.h
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*
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* \brief This file contains the DataSet class and a small structure called DataSetContent.
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*
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* \date 10/17/2012
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*
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* \author Bastian Baetz
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*
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*/
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#ifndef DATASET_H_
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#define DATASET_H_
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#include <framework/datapool/DataPool.h>
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#include <framework/datapool/DataSetIF.h>
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#include <framework/datapool/PoolRawAccess.h>
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#include <framework/datapool/PoolVariable.h>
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#include <framework/datapool/PoolVarList.h>
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#include <framework/datapool/PoolVector.h>
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#include <framework/serialize/SerializeAdapter.h>
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/**
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* \brief The DataSet class manages a set of locally checked out variables.
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*
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* \details This class manages a list, where a set of local variables (or pool variables) are
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* registered. They are checked-out (i.e. their values are looked up and copied)
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* with the read call. After the user finishes working with the pool variables,
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* he can write back all variable values to the pool with the commit call.
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* The data set manages locking and freeing the data pool, to ensure that all values
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* are read and written back at once.
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* An internal state manages usage of this class. Variables may only be registered before
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* the read call is made, and the commit call only after the read call.
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* If pool variables are writable and not committed until destruction of the set, the
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* DataSet class automatically sets the valid flag in the data pool to invalid (without)
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* 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 DataSet: public DataSetIF, public HasReturnvaluesIF, public SerializeIF {
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private:
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//SHOULDDO we could use a linked list of datapool variables
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static const uint8_t DATA_SET_MAX_SIZE = 63; //!< This definition sets the maximum number of variables to register in one DataSet.
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/**
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* \brief This array represents all pool variables registered in this set.
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* \details It has a maximum size of DATA_SET_MAX_SIZE.
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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 the correct array
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* position and that the maximum number of 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, which is important e.g. for the
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* behavior on destruction.
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*/
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States state;
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/**
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* \brief This is a small helper function to facilitate locking the global data pool.
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* \details It makes use of the lockDataPool method offered by the DataPool class.
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*/
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uint8_t lockDataPool();
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/**
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* \brief This is a small helper function to facilitate unlocking the global data pool.
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* \details It makes use of the freeDataPoolLock method offered by the DataPool class.
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*/
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uint8_t freeDataPoolLock();
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public:
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static const uint8_t INTERFACE_ID = CLASS_ID::DATA_SET_CLASS;
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static const ReturnValue_t INVALID_PARAMETER_DEFINITION =
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MAKE_RETURN_CODE( 0x01 );
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static const ReturnValue_t SET_WAS_ALREADY_READ = MAKE_RETURN_CODE( 0x02 );
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static const ReturnValue_t COMMITING_WITHOUT_READING =
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MAKE_RETURN_CODE(0x03);
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/**
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* \brief The constructor simply sets the fill_count to zero and sets the state to "uninitialized".
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*/
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DataSet();
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/**
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* \brief The destructor automatically manages writing the valid information of variables.
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* \details 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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~DataSet();
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/**
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* \brief The read call initializes reading out all registered variables.
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* \details 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 from the
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* data pool) which are not write-only. In case of an error (e.g. a wrong data type,
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* or an invalid data pool id), the operation is aborted and
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* \c INVALID_PARAMETER_DEFINITION returned.
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* The data pool is locked during the whole read operation and freed afterwards.
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* 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 calling
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* 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 It iterates through the list of registered variables and calls
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* the commit() method of the remaining registered variables (which write back
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* their values to the pool).
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* The data pool is locked during the whole commit operation and freed afterwards.
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* The state changes to "was committed" after this operation.
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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 contains non write-only
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* 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 contains non write-only
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* variables
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*/
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ReturnValue_t commit(uint8_t valid);
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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 copies all required information to the currently
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* free space in the registeredVariables list.
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*/
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void registerVariable(PoolVariableIF* variable);
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/**
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* Set the valid information of all variables contained in the set which are not readonly
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*
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* @param valid Validity information from PoolVariableIF.
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*/
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void setValid(uint8_t valid);
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ReturnValue_t serialize(uint8_t** buffer, uint32_t* size,
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const uint32_t max_size, bool bigEndian) const;
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uint32_t getSerializedSize() const;
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ReturnValue_t deSerialize(const uint8_t** buffer, int32_t* size,
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bool bigEndian);
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};
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#endif /* DATASET_H_ */
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