This sample demonstrates the use of the TIBCO StreamBase® Regular Expression Socket 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.
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 The file reader in that application has been replaced
by a socket reader, which is configured to connect to port 9000 on the local computer.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.
In StreamBase Studio, import this sample with the following steps:
From the top-level menu, click→ .
regexsto narrow the list of options.
Select Regular Expression Socket input adapter from the StreamBase Standard Adapters category.
StreamBase Studio creates a project for the sample.
A simple Java server is provided as part of this sample, and it must be running before starting the sample. Run it as follows:
Open a terminal window on UNIX, or a StreamBase Command Prompt on Windows.
In the window, navigate to the directory where the sample is installed, or to your workspace copy of the sample, as described above.
In the window, compile the sample server with the following command:
javac src\main\java\com\sample\adapter\regexsocketreader\ SimpleServer.java
In the window, run the sample server with the following command:
java -cp src\main\java com.sample.adapter.regexsocketreader. SimpleServer
In the Project Explorer, open the sample you just loaded.
Open the package folder (most samples contain a single package folder. Open the top-level package folder if your sample contains more than one folder).
Open the named application file and click the Run button. This opens the SB Test/Debug perspective and starts the application.
If you see red marks, wait a moment for the project in Studio to load its features.
If red marks do not resolve themselves in a moment, select the project and right-click→ from the context menu.
The Output Streams view shows activity as the StreamBase application reads input from the Simple Server Java application.
Select the Manual Input tab.
maxfor Username, and click .
The Output Streams view shows the time and IP address for the last queried user, according to the log.
When done, press F9 or click the Stop Running Application button to stop the StreamBase application.
In the Console view, use the Display Selected Console button to select the console showing
Click the red square above the Console view to terminate the
When you load the sample into StreamBase Studio, Studio copies the sample project's files to your Studio workspace, which is normally part of your home directory, with full access rights.
Load this sample in StreamBase Studio, and thereafter use the Studio workspace copy of the sample to run and test it, even when running from the command prompt.
Using the workspace copy of the sample avoids permission problems. The default workspace location for this sample is:
See Default Installation Directories for the default location of
studio-workspace on your system.