Class ReaderHistory

Inheritance Relationships

Base Type

Derived Type

Class Documentation

class ReaderHistory : public eprosima::fastrtps::rtps::History

Class ReaderHistory, container of the different CacheChanges of a reader

Subclassed by eprosima::fastrtps::SubscriberHistory

Public Functions

RTPS_DllAPI ReaderHistory(const HistoryAttributes &att)

Constructor of the ReaderHistory. It needs a HistoryAttributes.

RTPS_DllAPI ~ReaderHistory() override
virtual RTPS_DllAPI bool can_change_be_added_nts (const GUID_t &writer_guid, uint32_t total_payload_size, size_t unknown_missing_changes_up_to, bool &will_never_be_accepted) const

Check if a new change can be added to this history.

Parameters

  • writer_guid – [in] GUID of the writer where the change came from.

  • total_payload_size – [in] Total payload size of the incoming change.

  • unknown_missing_changes_up_to – [in] The number of changes from the same writer with a lower sequence number that could potentially be received in the future.

  • will_never_be_accepted – [out] When the method returns false, this parameter will inform whether the change could be accepted in the future or not.

Pre

change should not be present in the history

Returns

Whether a call to received_change will succeed when called with the same arguments.

virtual RTPS_DllAPI bool received_change (CacheChange_t *change, size_t unknown_missing_changes_up_to)

Virtual method that is called when a new change is received. In this implementation this method just calls add_change. The user can overload this method in case he needs to perform additional checks before adding the change.

Parameters

  • change – Pointer to the change

  • unknown_missing_changes_up_to – The number of changes from the same writer with a lower sequence number that could potentially be received in the future.

Returns

True if added.

inline virtual RTPS_DllAPI bool received_change (CacheChange_t *change, size_t unknown_missing_changes_up_to, fastdds::dds::SampleRejectedStatusKind &rejection_reason)

Virtual method that is called when a new change is received. In this implementation this method just calls add_change. The user can overload this method in case he needs to perform additional checks before adding the change.

Parameters

  • change – [in] Pointer to the change

  • unknown_missing_changes_up_to – [in] The number of changes from the same writer with a lower sequence number that could potentially be received in the future.

  • rejection_reason – [out] In case of been rejected the sample, it will contain the reason of the rejection.

Returns

True if added.

inline virtual RTPS_DllAPI virtual bool completed_change (rtps::CacheChange_t *change)

Called when a fragmented change is received completely by the Subscriber. Will find its instance and store it.

Parameters

change – [in] The received change

Pre

Change should be already present in the history.

Returns

inline virtual RTPS_DllAPI bool completed_change (CacheChange_t *change, size_t unknown_missing_changes_up_to, fastdds::dds::SampleRejectedStatusKind &rejection_reason)

Called when a fragmented change is received completely by the Subscriber. Will find its instance and store it.

Parameters

  • change – [in] The received change

  • unknown_missing_changes_up_to – [in] Number of missing changes before this one

  • rejection_reason – [out] In case of been rejected the sample, it will contain the reason of the rejection.

Pre

Change should be already present in the history.

Returns

RTPS_DllAPI bool add_change (CacheChange_t *a_change)

Add a CacheChange_t to the ReaderHistory.

Parameters

a_change – Pointer to the CacheChange to add.

Returns

True if added.

virtual RTPS_DllAPI iterator remove_change_nts (const_iterator removal, bool release=true) override

Remove a specific change from the history. No Thread Safe

Parameters

  • removal – iterator to the change for removal

  • release – specifies if the change must be returned to the pool

Returns

iterator to the next change if any

virtual RTPS_DllAPI bool matches_change (const CacheChange_t *inner, CacheChange_t *outer) override

Criteria to search a specific CacheChange_t on history

Parameters

  • inner – change to compare

  • outer – change for comparison

Returns

true if inner matches outer criteria

RTPS_DllAPI bool remove_changes_with_guid (const GUID_t &a_guid)

Remove all changes from the History that have a certain guid.

Parameters

a_guid – Pointer to the target guid to search for.

Returns

True if successful, even if no changes have been removed.

bool remove_fragmented_changes_until(const SequenceNumber_t &seq_num, const GUID_t &writer_guid)

Remove all fragmented changes from certain writer up to certain sequence number.

Parameters

  • seq_num – First SequenceNumber_t not to be removed.

  • writer_guid – GUID of the writer for which changes should be looked for.

Returns

True if successful, even if no changes have been removed.

RTPS_DllAPI bool get_min_change_from (CacheChange_t **min_change, const GUID_t &writerGuid)
virtual RTPS_DllAPI void writer_unmatched (const GUID_t &writer_guid, const SequenceNumber_t &last_notified_seq)

Called when a writer is unmatched from the reader holding this history.

This method will remove all the changes on the history that came from the writer being unmatched and which have not yet been notified to the user.

Parameters

  • writer_guid – GUID of the writer being unmatched.

  • last_notified_seq – Last sequence number from the specified writer that was notified to the user.

inline virtual RTPS_DllAPI void writer_update_its_ownership_strength_nts (const GUID_t &writer_guid, const uint32_t ownership_strength)

This function should be called by reader if a writer updates its ownership strength.

Parameters

  • writer_guid – [in] Guid of the writer which changes its ownership strength.

  • ownership_strength – [out] New value of the writer’s Ownership strength.

RTPS_DllAPI bool remove_change (CacheChange_t *ch)

Introduce base class method into scope.

inline RTPS_DllAPI iterator remove_change (const_iterator removal, bool release=true)

Introduce base class method into scope.

Protected Functions

virtual RTPS_DllAPI bool do_reserve_cache (CacheChange_t **change, uint32_t size) override
virtual RTPS_DllAPI void do_release_cache (CacheChange_t *ch) override
template<typename Pred>
inline void remove_changes_with_pred(Pred pred)

Protected Attributes

RTPSReader *mp_reader

Pointer to the reader.