Join Operator Sample

This sample uses a Join operator to combine trades from a Reuters and the Interactive Data PlusFeed (formerly Comstock), where the stocks are the same and the price per share is greater than or equal to $1, over a period of 60 seconds. The input streams contain the fields Symbol, PricePS_R (per share), and Time.

Running Join.sbapp in StreamBase Studio

  1. In the Package Explorer, double-click to open the Join.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 JoinOut output stream. No output is displayed at this point, but the dequeuer is prepared to receive output. This view will eventually show the output of the application.

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

  5. Enter intc, 23.0, and 10 in the Symbol_R, PricePS_R, and Time_R fields, respectively.

  6. Click Send Data, and observe that no output is displayed yet in the Application Output view.

  7. Select the ComstockIn input stream.

  8. Enter intc, 23.5, and 20 in the Symbol_C, PricePS_C, and Time_C fields, respectively.

  9. Click Send Data, and observe that no output is displayed yet in the Application Output view.

  10. Select the ReutersIn input stream.

  11. Enter intc, 24.5, and 30 in the Symbol_R, PricePS_R, and Time_R fields, respectively.

  12. Click Send Data, and observe this data appears in the Application Output view

    DeltaPricePS=1.0, PricePS_R=24.5, PricePS_C=23.5, Time_R=30
  13. Select the ComstockIn input stream.

  14. Enter amat, 34.5, and 40 in the Symbol_C, PricePS_C, and Time_C fields, respectively.

  15. Click Send Data, and observe that no further output is displayed yet in the Application Output view.

  16. Enter intc, 26.5, and 50 in the Symbol_C, PricePS_C, and Time_C fields, respectively.

  17. Click Send Data, and observe this data appears in the Application Output view

    DeltaPricePS=-3.5, PricePS_R=23.0, PricePS_C=26.5, Time_R=10
    DeltaPricePS=-2.0, PricePS_R=24.5, PricePS_C=26.5, Time_R=30
  18. Select the ReutersIn input stream.

  19. Enter amat, 32.5, and 60 in the Symbol_R, PricePS_R, and Time_R fields, respectively

  20. Click Send Data, and observe this data appears in the Application Output view

    DeltaPricePS=-2.0, PricePS_R=32.5, PricePS_C=34.5, Time_R=60
  21. Select the ComstockIn input stream.

  22. Enter intc, 27.5, and 100 in the Symbol_C, PricePS_C, and Time_C fields, respectively.

  23. Click Send Data, and observe that no further output is displayed yet in the Application Output view.

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

Running Join.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, enter:

    sbd Join.sbapp

    A message indicates that the StreamBase Server is listening and waiting for tuples.

  3. In window 2, enter:

    sbc dequeue JoinOut

    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, enter:

    sbc enqueue ComstockIn

    The sbc command is now awaiting keyboard input.

  5. In window 4, enter:

    sbc enqueue ReutersIn

    The sbc command is now awaiting keyboard input.

  6. In window 4, enter:

    intc, 23.0, 10

    No output is displayed yet in the dequeue window.

  7. In window 3, enter:

    intc, 23.5, 20

    No output is displayed yet in the dequeue window.

  8. In window 4, enter:

    intc, 24.5, 30

    Observe this output in the dequeue window:

    1,24.5,23.5,30
  9. In window 3, enter:

    amat, 34.5, 40

    No further output is displayed yet in the dequeue window.

  10. In window 3, enter:

    intc, 26.5, 50

    Observe this output in the dequeue window:

    -3.5,23,26.5,10
    -2,24.5,26.5,30
  11. In window 4, enter:

    amat, 32.5, 60

    Observe this output in the dequeue window:

    -2,32.5,34.5,60
  12. In window 3, enter:

    intc, 27.5, 100

    No output is displayed yet in the dequeue window.

  13. In window 2, type: Ctrl+Z (Windows) or Ctrl+D (UNIX) to exit the sbc session.

  14. In window 3, 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 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.