Pattern Operator Sample

This sample uses a Pattern operator to pass in only market data for securities that have already been traded. The MarketData input stream contains the fields symbol, price, and time. The TradeData input stream has the same fields plus a shares field.

This topic describes Pattern.sbapp, the Pattern operator sample application.

Running Pattern.sbapp in StreamBase Studio

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

  2. Click the Run button. This opens the SB Test/Debug perspective and starts the application.

  3. In the Application Output view, select the RelevantMarketData output stream.

  4. In the Manual Input view, select the MarketData input stream.

  5. Enter GOOG, 10 and 1 in the symbol, price, and time fields, respectively.

  6. Click Send Data, and observe that no data appears on the RelevantMarketData stream, as there have been no trades in GOOG.

  7. In the Manual Input view, select the TradeData input stream.

  8. Enter GOOG, 10, 20, and 2 in the symbol, price, shares, and time fields, respectively.

  9. In the Manual Input view, reselect the MarketData input stream.

  10. Change the values of price and time to 11 and 3, respectively.

  11. Click Send Data, and observe that this data shows up on the output stream.

  12. Reselect the TradeData input stream.

  13. Change the values of symbol and time to YHOO and 4, respectively, and click Send Data.

  14. Reselect the MarketData input stream.

  15. Change the value of time to 5 and click Send Data. Notice that this information still shows up on the output stream.

  16. Change the value of symbol and time to YHOO and 6, respectively.

  17. Click Send Data, and observe that this data shows up on the output stream.

  18. When done, press F9 or click the Stop Running Application button.

Running Pattern.sbapp in Terminal Windows

This section describes how to run the sample in UNIX terminal windows or Windows command prompt windows. On Windows, be sure to use the StreamBase Command Prompt from the Start menu as described in the Test/Debug Guide, not the default command prompt.

  1. Open four terminal windows on UNIX, or four StreamBase Command Prompts on Windows. In each window, navigate to the directory where the sample is installed, or to your workspace copy of the sample, as described above.

  2. In window 1, type:

    sbd Pattern.sbapp

    The window shows notice[StreamBaseServer] listening on port 10000.

  3. In window 2: type:

    sbc dequeue RelevantMarketData

    No output is displayed at this point, but the dequeuer is prepared to receive output. This window will eventually show the output of the application.

  4. In window 3, type:

    sbc enqueue TradeData

    The sbc command is now awaiting keyboard input.

  5. In window 4, type:

    sbc enqueue MarketData

    The sbc command is now awaiting keyboard input. Then type: GOOG, 10, 1.

    No output is displayed yet in the dequeue window.

  6. In window 3, type:

    GOOG, 10, 20, 2.

    In window 4, type:

    GOOG, 11, 3.

    Observe this line in the dequeue window: GOOG,11,3.000.

  7. In window 3, type:

    YHOO, 10, 20, 4.

    In window 4, type:

    GOOG, 11, 5.

    Observe that this is still output in the dequeue window.

    In window 4, type:

    YHOO, 11, 6.

    Observe this line in the dequeue window: YHOO,11,6.000.

  8. In window 3 and 4 type: Ctrl+Z (Windows) or Ctrl+D (UNIX) to stop the sbc command.

  9. In window 3 or 4, type the following command to terminate the server and dequeuer:

    sbadmin shutdown

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Importing This Sample into StreamBase Studio

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

  • From the top menu, click FileLoad StreamBase Sample.

  • Select operator from the Data Constructs and Operators category.

  • Click OK.

StreamBase Studio creates a single project for all the operator samples.

Sample Location

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.

Important

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:

studio-workspace/sample_operator

See Default Installation Directories for the location of studio-workspace on your system.

In the default TIBCO StreamBase installation, this sample's files are initially installed in:

streambase-install-dir/sample/operator

See Default Installation Directories for the default location of studio-workspace on your system.