Trace Analysis Patterns (Part 122)
Saturday, March 12th, 2016Data Selector is a variant of Inter-Correlation trace analysis pattern where we use data found in one trace to select Message Set or Adjoint Thread of Activity in another trace. This analysis activity is depicted in the following picture where we have a client log and corresponding server log. In the server log we have log entries for many client sessions. To select messages corresponding to our client session we use some data attribute in the client trace, for example, the user name, and Linked Messages analysis pattern to find one of the messages in the server log that contains the same user name. Then we find out which user session it belongs to and form its Adjoint Thread:
This pattern is different from Identification Messages where we don’t even know the object that emitted trace messages. In Data Selector case we know in principle what kind of messages we are looking for. We just need to select among many alternatives.
- Dmitry Vostokov @ DumpAnalysis.org + TraceAnalysis.org -