This sample demonstrates the use of the TIBCO StreamBase® Regular Expression File Reader in a StreamBase application that processes a text log file, storing the information extracted from the log in a query table. The log file is typical of a server log: it contains information about user logins, as well as other, spurious information. The format of the log file means it is not particularly suited to direct use in an application. It does not, for example, consist of CSV records that are ready to be turned into tuples; it must be parsed first and useful information extracted. Because the log file is text- and line-oriented, it is well suited to parsing using regular expressions.
Keep in mind that it is difficult to observe all log reading activities. The input adapter begins reading the input file and outputting tuples as soon as the module starts, before StreamBase Studio or external dequeuers have time to connect to the output of the reader. However, the module itself is fully functional, and all tuples read from the input file will be present in the query table.
Enter regexr to narrow the list of options.
Select Regular expression file input reader from the StreamBase Standard Adapters category.
Open the RegexReader.sbapp file and click the Run button. This opens the SB Test/Debug perspective and starts the module.
Select the Manual Input tab.
Enter joe, fred, bob, or max for Username, and click Send Data.
The Output Streams view shows the time and IP address for the last queried user, according to the log.