108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
#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/datapool/StaticDataSetBase.h>
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#include <framework/datapoollocal/OwnsLocalDataPoolIF.h>
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#include <framework/serialize/SerializeIF.h>
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class LocalDataPoolManager;
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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: public DataSetBase {
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public:
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/**
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* @brief Constructor for the creator of local pool data.
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* 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(OwnsLocalDataPoolIF* hkOwner);
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/**
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* @brief Constructor for users of local pool data. The passed pool
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* owner should implement the HasHkPoolParametersIF.
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* 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(object_id_t ownerId);
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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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* Special version of the serilization function which appends a
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* validity buffer at the end. Each bit of this validity buffer
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* denotes whether the container data set entries are valid from left
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* to right, MSB first.
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* @param buffer
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* @param size
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* @param maxSize
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* @param bigEndian
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* @param withValidityBuffer
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* @return
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*/
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ReturnValue_t serializeWithValidityBuffer(uint8_t** buffer,
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size_t* size, const size_t maxSize, bool bigEndian) const;
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ReturnValue_t serializeLocalPoolIds(uint8_t** buffer,
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size_t* size, const size_t maxSize, bool bigEndian) const;
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protected:
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private:
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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 global data pool.
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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(uint32_t timeoutMs) override;
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/**
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* @brief This is a small helper function to facilitate
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* unlocking the global data pool
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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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LocalDataPoolManager* hkManager;
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/**
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* Set n-th bit of a byte, with n being the position from 0
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* (most significant bit) to 7 (least significant bit)
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*/
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void bitSetter(uint8_t* byte, uint8_t position) const;
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};
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#endif /* FRAMEWORK_DATAPOOLLOCAL_LOCALDATASET_H_ */
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