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Merge pull request 'Added Documentation to PlacementFactory' (#223) from gaisser/fsfw:gaisser_documentation_placementFactory into master 

Reviewed-on: fsfw/fsfw#223
This commit is contained in:
Robin Müller 2020-10-01 11:04:08 +02:00
parent 6efdf170f4 8178be9dc5
commit b2a7859549
1 changed files with 39 additions and 3 deletions
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42
container/PlacementFactory.h
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@ -3,26 +3,62 @@
#include "../storagemanager/StorageManagerIF.h"
#include <utility>
/**
* The Placement Factory is used to create objects at runtime in a specific pool.
* In general, this should be avoided and it should only be used if you know what you are doing.
* You are not allowed to use this container with a type that allocates memory internally like ArrayList.
*
* Also, you have to check the returned pointer in generate against nullptr!
*
* A backend of Type StorageManagerIF must be given as a place to store the new objects.
* Therefore ThreadSafety is only provided by your StorageManager Implementation.
*
* Objects must be destroyed by the user with "destroy"! Otherwise the pool will not be cleared.
*
* The concept is based on the placement new operator.
*
* @warning Do not use with any Type that allocates memory internally!
* @ingroup container
*/
class PlacementFactory {
public:
PlacementFactory(StorageManagerIF* backend) :
dataBackend(backend) {
}
/***
* Generates an object of type T in the backend storage.
*
* @warning Do not use with any Type that allocates memory internally!
*
* @tparam T Type of Object
* @param args Constructor Arguments to be passed
* @return A pointer to the new object or a nullptr in case of failure
*/
template<typename T, typename ... Args>
T* generate(Args&&... args) {
store_address_t tempId;
uint8_t* pData = NULL;
uint8_t* pData = nullptr;
ReturnValue_t result = dataBackend->getFreeElement(&tempId, sizeof(T),
&pData);
if (result != HasReturnvaluesIF::RETURN_OK) {
return NULL;
return nullptr;
}
T* temp = new (pData) T(std::forward<Args>(args)...);
return temp;
}
/***
* Function to destroy the object allocated with generate and free space in backend.
* This must be called by the user.
*
* @param thisElement Element to be destroyed
* @return RETURN_OK if the element was destroyed, different errors on failure
*/
template<typename T>
ReturnValue_t destroy(T* thisElement) {
if (thisElement == nullptr){
return HasReturnvaluesIF::RETURN_FAILED;
}
//Need to call destructor first, in case something was allocated by the object (shouldn't do that, however).
thisElement->~T();
uint8_t* pointer = (uint8_t*) (thisElement);