Disposing of Topic Instances

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Frank J. Crow's picture
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Disposing of Topic Instances

Is it possible to have an application that disposes of topic instances that it did not create?

 

Further, is it possible for an application to start up and dispose of topic instances that it has never seen?  (by key)

 

 

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Frank J. Crow's picture
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Last seen: 8 years 7 months ago
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After a bit of experimentation, I'm able to answer my own questions.

 

While it is possible to have an application that disposes of topic instances that it did not create, it is not possible to dispose of instances that have not been seen.

 

Just FYI... in case somebody else needs to know about topic instance disposal.

 

Gerardo Pardo's picture
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Hi,

 

What you describe is the default out-of-the-box behavior. However it is possible to both dispose a Topic instance from a writer that has never written that Topic-instance before as well as to receive the dispose Topic-instance message from a DataReader that has never seen that Topic-instance if you configure the QoS of both the DataWriter and DataReader to enable this behavior.

 

On the DataWriter you need to configure the DataWriterProtocolQosPolicy setting the 'serialize_key_with_dispose' attribute in this policy to DDS_BOOLEAN_TRUE.  

Similarly on the DataReader you need to configure the DataReaderProtocolQosPolicy setting the 'propagate_dispose_of_unregistered_instances' attribute in this policy to DDS_BOOLEAN_TRUE.

 

You can find details on what these policies/setting do at: http://community.rti.com/docs/html/api_cpp/structDDS__DataWriterProtocolQosPolicy.html and http://community.rti.com/docs/html/api_cpp/structDDS__DataReaderProtocolQosPolicy.html