Regular Expression Socket Reader Input Adapter Sample

Contents

Importing This Sample into StreamBase Studio
Installed Sample File Locations
Running This Sample in StreamBase Studio
Running This Sample in Terminal Windows

This sample demonstrates 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.

This example is based on the Regular Expression File Reader sample. The file reader in that application has been replaced by a socket reader, which is configured to connect to port 9000 on the local computer. The sample comes with a very simple server written in Java. The source code and compiled JAR of this server can be found in the sample's directory. The server simply listens on port 9000 and serves the contents of a file (by default, input.txt, though this can be specified on the command line) at one line per second to any connections.

Note

Before the sample application is started, the file server included in the sample directory must be running.

Importing This Sample into StreamBase Studio

In StreamBase Studio, import this sample with the following steps:

  • From the top menu, click File → Load StreamBase Sample.

  • Select this sample from the Embedded Adapters list.

  • Click OK.

StreamBase Studio creates a single project containing the sample files.

Installed Sample File Locations

By default, the sample files are installed in:

On Windows

C:\Program Files\StreamBase Systems\StreamBase.n.m\sample\adapter\embedded\regexsocketreader\

On UNIX

/opt/streambase/sample/adapter/embedded/regexsocketreader/

Running This Sample in StreamBase Studio

  1. Launch simpleserver.jar. The JAR can be found in the Custom Libraries directory in the sample directory. To do from a terminal, go to the Custom Libraries directory in your project and run java -jar simpleserver.jar.

  2. In the Package Explorer, double-click to open the RegexSocketReader.sbapp application. Make sure the application is the currently active tab in the EventFlow Editor.

  3. Click the Run StreamBase Application (Default Launch) button. (Not the Run button.) This opens the Test/Debug perspective and starts the application.

  4. Select the Manual Input tab.

  5. Enter joe, fred, bob, or max for Username, and press Send Data.

  6. The Application Output pane shows the time and IP address for the last queried user, according to the log.

  7. Click Run → Stop Running Application (F9).

  8. In the window running simpleserver, press Ctrl-C to stop the server.

Running This Sample in Terminal Windows

  1. Change the current working directory to where the sample is installed.

  2. Launch simpleserver.jar. To do from a terminal, run java -jar simpleserver.jar.

  3. In another window, run sbd RegexSocketReader.sbapp

  4. In another window, run sbc dequeue Output.

  5. In another window, run sbc enqueue Queries.

  6. In the enqueue window, type joe, fred, bob, or max, and press Enter. The result of your query should appear in the dequeue window.

  7. Run sbadmin shutdown.

  8. In the window running simpleserver, press Ctrl-C to stop the server.