RTI Connext C++ API  Version 5.0.0
DDS_ExpressionProperty Struct Reference

Provides additional information about the filter expression passed to DDSWriterContentFilter::writer_compile. More...

Public Attributes

DDS_Boolean key_only_filter
 Indicates if the filter expression is based only on key fields. In this case, RTI Connext itself can cache the filtering results.
 
DDS_Boolean writer_side_filter_optimization
 Indicates if the filter implementation can cache the filtering result for the provided expression.
 

Detailed Description

Provides additional information about the filter expression passed to DDSWriterContentFilter::writer_compile.

It is used by the filter implementation to indicate to the middleware whether or not the DDSWriterContentFilter will cache the result of filter evaluation.

Member Data Documentation

DDS_Boolean DDS_ExpressionProperty::key_only_filter

Indicates if the filter expression is based only on key fields. In this case, RTI Connext itself can cache the filtering results.

When this field is set to DDS_BOOLEAN_TRUE, it indicates to RTI Connext that the filter expression is based only on key fields.

DDS_Boolean DDS_ExpressionProperty::writer_side_filter_optimization

Indicates if the filter implementation can cache the filtering result for the provided expression.

When this field is set to DDS_BOOLEAN_TRUE, RTI Connext will do no caching or explicit filter evaluation for the associated DDSDataReader. Instead, it will rely on the filter implementation to provide appropriate results.


RTI Connext C++ API Version 5.0.0 Copyright © Thu Aug 30 2012 Real-Time Innovations, Inc