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

165 lines
4.5 KiB
C++

#ifndef PIDREADER_H_
#define PIDREADER_H_
#include "../datapool/DataSetIF.h"
#include "../datapoolglob/GlobalDataPool.h"
#include "../datapool/PoolEntry.h"
#include "../datapool/PoolVariableIF.h"
#include "../serialize/SerializeAdapter.h"
#include "../serviceinterface/ServiceInterfaceStream.h"
template<typename U, uint8_t n_var> class PIDReaderList;
template<typename T>
class PIDReader: public PoolVariableIF {
template<typename U, uint8_t n_var> friend class PIDReaderList;
protected:
uint32_t parameterId;
uint8_t valid;
ReturnValue_t readWithoutLock() {
uint8_t arrayIndex = GlobalDataPool::PIDToArrayIndex(parameterId);
PoolEntry<T> *read_out = glob::dataPool.getData<T>(
GlobalDataPool::PIDToDataPoolId(parameterId), arrayIndex);
if (read_out != NULL) {
valid = read_out->valid;
value = read_out->address[arrayIndex];
return HasReturnvaluesIF::RETURN_OK;
} else {
value = 0;
valid = false;
sif::error << "PIDReader: read of PID 0x" << std::hex << parameterId
<< std::dec << " failed." << std::endl;
return HasReturnvaluesIF::RETURN_FAILED;
}
}
/**
* Never commit, is read-only.
* Reason is the possibility to access a single DP vector element, but if we commit,
* we set validity of the whole vector.
*/
ReturnValue_t commit(uint32_t lockTimeout) override {
return HasReturnvaluesIF::RETURN_FAILED;
}
ReturnValue_t commitWithoutLock() override {
return HasReturnvaluesIF::RETURN_FAILED;
}
/**
* Empty ctor for List initialization
*/
PIDReader() :
parameterId(PoolVariableIF::NO_PARAMETER), valid(
PoolVariableIF::INVALID), value(0) {
}
public:
/**
* \brief This is the local copy of the data pool entry.
*/
T value;
/**
* \brief In the constructor, the variable can register itself in a DataSet (if not NULL 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 NULL,
* 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.
*/
PIDReader(uint32_t setParameterId, DataSetIF *dataSet) :
parameterId(setParameterId), valid(PoolVariableIF::INVALID), value(
0) {
if (dataSet != NULL) {
dataSet->registerVariable(this);
}
}
ReturnValue_t read(uint32_t lockTimeout) override {
ReturnValue_t result = glob::dataPool.lockDataPool();
if(result != HasReturnvaluesIF::RETURN_OK) {
return result;
}
result = readWithoutLock();
ReturnValue_t unlockResult = glob::dataPool.unlockDataPool();
if(unlockResult != HasReturnvaluesIF::RETURN_OK) {
sif::error << "PIDReader::read: Could not unlock data pool!"
<< std::endl;
}
return result;
}
/**
* Copy ctor to copy classes containing Pool Variables.
*/
PIDReader(const PIDReader &rhs) :
parameterId(rhs.parameterId), valid(rhs.valid), value(rhs.value) {
}
/**
* \brief The classes destructor is empty.
*/
~PIDReader() {
}
/**
* \brief This operation returns the data pool id of the variable.
*/
uint32_t getDataPoolId() const {
return GlobalDataPool::PIDToDataPoolId(parameterId);
}
uint32_t getParameterId() const {
return parameterId;
}
/**
* This method returns if the variable is write-only, read-write or read-only.
*/
ReadWriteMode_t getReadWriteMode() const {
return VAR_READ;
}
/**
* \brief With this call, the valid information of the variable is returned.
*/
bool isValid() const {
if (valid)
return true;
else
return false;
}
uint8_t getValid() {
return valid;
}
void setValid(bool valid) {
this->valid = valid;
}
operator T() {
return value;
}
PIDReader<T>& operator=(T newValue) {
value = newValue;
return *this;
}
virtual ReturnValue_t serialize(uint8_t **buffer, size_t *size,
size_t maxSize, Endianness streamEndianness) const override {
return SerializeAdapter::serialize(&value, buffer, size, maxSize,
streamEndianness);
}
virtual size_t getSerializedSize() const override {
return SerializeAdapter::getSerializedSize(&value);
}
virtual ReturnValue_t deSerialize(const uint8_t **buffer, size_t *size,
Endianness streamEndianness) override {
return SerializeAdapter::deSerialize(&value, buffer, size,
streamEndianness);
}
};
#endif /* PIDREADER_H_ */