fsfw/storagemanager/StorageManagerIF.h
2021-01-19 15:04:47 +01:00

200 lines
7.4 KiB
C++

#ifndef FSFW_STORAGEMANAGER_STORAGEMANAGERIF_H_
#define FSFW_STORAGEMANAGER_STORAGEMANAGERIF_H_
#include "StorageAccessor.h"
#include "storeAddress.h"
#include "../events/Event.h"
#include "../returnvalues/HasReturnvaluesIF.h"
#include <utility>
#include <cstddef>
using AccessorPair = std::pair<ReturnValue_t, StorageAccessor>;
using ConstAccessorPair = std::pair<ReturnValue_t, ConstStorageAccessor>;
/**
* @brief This class provides an interface for intermediate data storage.
* @details The Storage manager classes shall be used to store larger chunks of
* data in RAM for exchange between tasks. This interface expects the
* data to be stored in one consecutive block of memory, so tasks can
* write directly to the destination pointer.
* For interprocess communication, the stores must be locked during
* insertion and deletion. If the receiving storage identifier is
* passed token-like between tasks, a lock during read and write
* operations is not necessary.
* @author Bastian Baetz
* @date 18.09.2012
*/
class StorageManagerIF : public HasReturnvaluesIF {
public:
using size_type = size_t;
using max_subpools_t = uint8_t;
static const uint8_t INTERFACE_ID = CLASS_ID::STORAGE_MANAGER_IF; //!< The unique ID for return codes for this interface.
static const ReturnValue_t DATA_TOO_LARGE = MAKE_RETURN_CODE(1); //!< This return code indicates that the data to be stored is too large for the store.
static const ReturnValue_t DATA_STORAGE_FULL = MAKE_RETURN_CODE(2); //!< This return code indicates that a data storage is full.
static const ReturnValue_t ILLEGAL_STORAGE_ID = MAKE_RETURN_CODE(3); //!< This return code indicates that data was requested with an illegal storage ID.
static const ReturnValue_t DATA_DOES_NOT_EXIST = MAKE_RETURN_CODE(4); //!< This return code indicates that the requested ID was valid, but no data is stored there.
static const ReturnValue_t ILLEGAL_ADDRESS = MAKE_RETURN_CODE(5);
static const ReturnValue_t POOL_TOO_LARGE = MAKE_RETURN_CODE(6); //!< Pool size too large on initialization.
static const uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::OBSW;
static const Event GET_DATA_FAILED = MAKE_EVENT(0, severity::LOW);
static const Event STORE_DATA_FAILED = MAKE_EVENT(1, severity::LOW);
//!< Indicates an invalid (i.e unused) storage address.
static const uint32_t INVALID_ADDRESS = 0xFFFFFFFF;
/**
* @brief This is the empty virtual destructor as required for C++ interfaces.
*/
virtual ~StorageManagerIF() {
}
;
/**
* @brief With addData, a free storage position is allocated and data
* stored there.
* @details During the allocation, the StorageManager is blocked.
* @param storageId A pointer to the storageId to retrieve.
* @param data The data to be stored in the StorageManager.
* @param size The amount of data to be stored.
* @return Returns @li RETURN_OK if data was added.
* @li RETURN_FAILED if data could not be added.
* storageId is unchanged then.
*/
virtual ReturnValue_t addData(store_address_t* storageId,
const uint8_t * data, size_t size, bool ignoreFault = false) = 0;
/**
* @brief With deleteData, the storageManager frees the memory region
* identified by packet_id.
* @param packet_id The identifier of the memory region to be freed.
* @return @li RETURN_OK on success.
* @li RETURN_FAILED if deletion did not work
* (e.g. an illegal packet_id was passed).
*/
virtual ReturnValue_t deleteData(store_address_t packet_id) = 0;
/**
* @brief Another deleteData which uses the pointer and size of the
* stored data to delete the content.
* @param buffer Pointer to the data.
* @param size Size of data to be stored.
* @param storeId Store id of the deleted element (optional)
* @return @li RETURN_OK on success.
* @li failure code if deletion did not work
*/
virtual ReturnValue_t deleteData(uint8_t* buffer, size_t size,
store_address_t* storeId = nullptr) = 0;
/**
* @brief Access the data by supplying a store ID.
* @details
* A pair consisting of the retrieval result and an instance of a
* ConstStorageAccessor class is returned
* @param storeId
* @return Pair of return value and a ConstStorageAccessor instance
*/
virtual ConstAccessorPair getData(store_address_t storeId) = 0;
/**
* @brief Access the data by supplying a store ID and a helper
* instance
* @param storeId
* @param constAccessor Wrapper function to access store data.
* @return
*/
virtual ReturnValue_t getData(store_address_t storeId,
ConstStorageAccessor& constAccessor) = 0;
/**
* @brief getData returns an address to data and the size of the data
* for a given packet_id.
* @param packet_id The id of the data to be returned
* @param packet_ptr The passed pointer address is set to the the memory
* position
* @param size The exact size of the stored data is returned here.
* @return @li RETURN_OK on success.
* @li RETURN_FAILED if fetching data did not work
* (e.g. an illegal packet_id was passed).
*/
virtual ReturnValue_t getData(store_address_t packet_id,
const uint8_t** packet_ptr, size_t* size) = 0;
/**
* Modify data by supplying a store ID
* @param storeId
* @return Pair of return value and StorageAccessor helper
*/
virtual AccessorPair modifyData(store_address_t storeId) = 0;
/**
* Modify data by supplying a store ID and a StorageAccessor helper instance.
* @param storeId
* @param accessor Helper class to access the modifiable data.
* @return
*/
virtual ReturnValue_t modifyData(store_address_t storeId,
StorageAccessor& accessor) = 0;
/**
* Get pointer and size of modifiable data by supplying the storeId
* @param packet_id
* @param packet_ptr [out] Pointer to pointer of data to set
* @param size [out] Pointer to size to set
* @return
*/
virtual ReturnValue_t modifyData(store_address_t packet_id,
uint8_t** packet_ptr, size_t* size) = 0;
/**
* This method reserves an element of @c size.
*
* It returns the packet id of this element as well as a direct pointer to the
* data of the element. It must be assured that exactly @c size data is
* written to p_data!
* @param storageId A pointer to the storageId to retrieve.
* @param size The size of the space to be reserved.
* @param p_data A pointer to the element data is returned here.
* @return Returns @li RETURN_OK if data was added.
* @li RETURN_FAILED if data could not be added.
* storageId is unchanged then.
*/
virtual ReturnValue_t getFreeElement(store_address_t* storageId,
const size_t size, uint8_t** p_data, bool ignoreFault = false ) = 0;
/**
* Clears the whole store.
* Use with care!
*/
virtual void clearStore() = 0;
/**
* Clears a pool in the store with the given pool index. Use with care!
* @param pageIndex
*/
virtual void clearSubPool(uint8_t poolIndex) = 0;
/**
* Get the fill count of the pool. Each character inside the provided
* buffer will be assigned to a rounded percentage fill count for each
* page. The last written byte (at the index bytesWritten - 1)
* will contain the total fill count of the pool as a mean of the
* percentages of single pages.
* @param buffer
* @param maxSize
*/
virtual void getFillCount(uint8_t* buffer, uint8_t* bytesWritten) = 0;
virtual size_t getTotalSize(size_t* additionalSize) = 0;
/**
* Get number of pools.
* @return
*/
virtual max_subpools_t getNumberOfSubPools() const = 0;
};
#endif /* FSFW_STORAGEMANAGER_STORAGEMANAGERIF_H_ */