DDS11 — (R#135) Add fields to PublicationMatchStatus and SubscriptionMatchStatus

There are two limitations to the PublicationMatchStatus and SubscriptionMatchStatus that prevent them from being used to detect the loss of a match:
· The specification does not indicate whether those statuses are considered to have changed when a match is lost (e.g. as a result of a loss of liveliness or an incompatible QoS change).
· The status structures contain fields that indicate the total number of matches that have ever occurred, but they lack fields to indicate the number of current matches.

Proposed Resolution:
Two fields should be added to each status structure: current_count and current_count_change. The specification should be updated to state that the publication and subscription match statuses are considered to have changed both when a match is established and when it is lost.

Proposed Revised Text:
Update the table in 2.1.4.1 as follows:

DataReader SUBSCRIPTION_MATCH_STATUS The DataReader has found a DataWriter that matches the Topic and has compatible QoS or has stopped communicating with a DataWriter that was previously considered to have matched.

DataWriter PUBLICATION_MATCH_STATUS The DataWriter has found DataReader that matches the Topic and has compatible QoS or has stopped communicating with a DataReader that was previously considered to have matched.

Update PublicationMatchStatus and SubscriptionMatchStatus in figure 2-13 to add the following attributes to each:

current_count : long
current_count_change : long

Update the PublicationMatchStatus section of the table on page 2-119 with the following rows:
current_count The number of DataReaders currently matched to the concerned DataWriter.
current_count_change The change in current_count since the last time the listener was called or the status was read.

Update the SubscriptionMatchStatus section of the table on page 2-119 with the following rows:
current_count The number of DataWriters currently matched to the concerned DataReader.
current_count_change The change in current_count since the last time the listener was called or the status was read.

Modify the declarations of the PublicationMatchStatus and SubscriptionMatchStatus structures in the IDL PSM in 2.2.3 as follows:

struct PublicationMatchStatus

;

struct SubscriptionMatchStatus

;

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