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.. note:: Use the content of the document to describe e.g. why a fault model is not applicable for the diagram.
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The DFA for the component [Your Component Name] is performed. To show evidence that all failure initiators are considered, the applicability has to be filled out in the
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following tables. For all applicable failure initiators, the DFA has to be performed.
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Dependent Failure Initiators
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----------------------------
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-
.. code-block:: rst
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Shared resources
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^^^^^^^^^^^^^^^^
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The dependent failure initiators related to shared resources are not applicable for the component. The shared resources
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will be considered in the platform DFA.
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Communication between the two elements
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Receiving function is affected by information that is false, lost, sent multiple times, or in the wrong order etc. from the sender.
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.. list-table:: DFA communication between elements
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:header-rows: 1
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:widths: 10,20,10,20
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* - ID
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- Violation cause communication between elements
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- Applicability
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- Rationale
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* - CO_01_01
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- Information passed via argument through a function call, or via writing/reading a variable being global to the two software functions (data flow)
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- no
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- No shared data input for nlohman-JSON and JSON-Wrapper.
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* - CO_01_02
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- Data or message corruption / repetition / loss / delay / masquerading or incorrect addressing of information
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- no
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- No messages between nlohman-JSON and JSON-Wrapper.
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* - CO_01_03
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- Insertion / sequence of information
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- no
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- No messages between nlohman-JSON and JSON-Wrapper.
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* - CO_01_04
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- Corruption of information, inconsistent data
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- no
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- No messages between nlohman-JSON and JSON-Wrapper.
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* - CO_01_05
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- Asymmetric information sent from a sender to multiple receivers, so that not all defined receivers have the same information
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- no
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- No messages between nlohman-JSON and JSON-Wrapper.
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* - CO_01_06
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- Information from a sender received by only a subset of the receivers
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- no
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- No messages between nlohman-JSON and JSON-Wrapper.
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* - CO_01_07
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- Blocking access to a communication channel
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- no
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- No communication channel shared between nlohman-JSON and JSON-Wrapper.
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Shared information inputs
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^^^^^^^^^^^^^^^^^^^^^^^^^
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Same information input used by multiple functions.
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.. list-table:: DFA shared information inputs
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:header-rows: 1
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:widths: 10,20,10,20
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* - ID
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- Violation cause shared information inputs
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- Applicability
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- Rationale
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* - SI_01_02
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- Configuration data
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- no
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- Configuration data may be shared but should not add additional failure modes.
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* - SI_01_03
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- Constants, or variables, being global to the two software functions
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- no
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- No global data is used by nlohman-JSON and JSON-Wrapper.
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* - SI_01_04
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- Basic software passes data (read from hardware register and converted into logical information) to two applications software functions
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- no
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- nlohman-JSON and JSON-Wrapper are not sharing HW related data.
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* - SI_01_05
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- Data / function parameter arguments / messages delivered by software function to more than one other function
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- no
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- nlohman-JSON and JSON-Wrapper are libraries incorporated by each using function individually.
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Unintended impact
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^^^^^^^^^^^^^^^^^
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Unintended impacts to function due to various failures.
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.. list-table:: DFA unintended impact
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:header-rows: 1
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:widths: 10,20,10,20
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* - ID
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- Violation cause unintended impact
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- Applicability
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- Rationale
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* - UI_01_01
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- Memory miss-allocation and leaks
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- no
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- Not a specific json topic, therefore covered at platform DFA.
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* - UI_01_02
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- Read/Write access to memory allocated to another software element
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- yes
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- nlohman-JSON and JSON-Wrapper are in same memory space
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* - UI_01_03
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- Stack/Buffer under-/overflow
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- no
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- Not a specific json topic, therefore covered at platform DFA.
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* - UI_01_04
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- Deadlocks
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- yes
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- Filesystem access may be blocking.
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* - UI_01_05
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- Livelocks
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- no
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- Not a specific json topic, therefore covered at feature level.
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* - UI_01_06
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- Blocking of execution
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- no
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- nlohman-JSON and JSON-Wrapper block each other.
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* - UI_01_07
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- Incorrect allocation of execution time
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- no
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- Execution time allocated by (external) OS on platform level, should be covered centrally at platform level.
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* - UI_01_08
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- Incorrect execution flow
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- no
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- Execution flow controlled by (external) OS on platform level, should be covered centrally at platform level.
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* - UI_01_09
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- Incorrect synchronization between software elements
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- no
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- nlohman-JSON and JSON-Wrapper have no synchronization needs.
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* - UI_01_10
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- CPU time depletion
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- yes
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- nlohman-JSON and JSON-Wrapper deplete each other's CPU time.
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* - UI_01_11
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- Memory depletion
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- no
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- Not a specific json topic, therefore covered at platform DFA.
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* - UI_01_12
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- Other HW unavailability
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- no
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- No special HW used for baselibs.
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DFA
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===
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For all identified applicable failure initiators, the DFA is performed in the following section.
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