Pattern Operator Sample

Contents

Running Pattern.sbapp in StreamBase Studio
Running Pattern.sbapp in Terminal Windows
Importing This Sample into StreamBase Studio
Sample Location

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. Reslect 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 File → Load 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

By default, the sample files are installed in:

  • On Windows: C:\Program Files\StreamBase Systems\StreamBase.n.m\sample\operator

  • On UNIX: /opt/streambase/sample/operator

When you load the sample into StreamBase Studio, Studio copies the sample project's files to your Studio workspace. StreamBase Systems recommends that you use the workspace copy of the sample, especially on UNIX, where you may not have write access to /opt/streambase. In the default installation, the path to this sample in your Studio workspace is: 

UNIX:       
  ~/streambase-studio-n.m-workspace/sample_operator
Windows XP:
  C:\Documents and Settings\username\My Documents\
      StreamBase Studio n.m Workspace\sample_operator
Windows 7 and Windows Vista:
  C:\Users\username\Documents\StreamBase Studio n.m Workspace\
      sample_operator