BSort Operator Sample

The Bsort.sbapp sample application uses a BSort operator to reorder trades by time, for an input stream where trades come in in random order. The input stream contains the fields Symbol, Volume, and Time. It is interesting to compare the results of running this application with two passes and with six passes. This topic describes the Bsort sample.

Running Bsort.sbapp in StreamBase Studio

  1. In the Package Explorer, double-click to open the Bsort.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 StockOut 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 StockIn input stream.

  5. Enter msft, 100, and 10 in the Symbol, Volume, and Time fields, respectively.

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

  7. Enter msft, 100, and 30 in the Symbol, Volume, and Time fields, respectively.

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

  9. Enter intc, 100, and 5 in the Symbol, Volume, and Time fields, respectively.

  10. Click Send Data, and observe this line in the Application Output view:

    Symbol=intc, Volume=100, Time=5

  11. Enter msft, 100, and 25 in the Symbol, Volume, and Time fields, respectively.

  12. Click Send Data, and observe this line in the Application Output view:

    Symbol=msft, Volume=100, Time=10

  13. Enter amat, 100, and 2 in the Symbol, Volume, and Time fields, respectively.

  14. Click Send Data, and observe this line in the Application Output view:

    Symbol=amat, Volume=100, Time=2

  15. Enter intc, 100, and 15 in the Symbol, Volume, and Time fields, respectively.

  16. Click Send Data, and observe this line in the Application Output view:

    Symbol=intc, Volume=100, Time=15

  17. Enter msft, 100, and 40 in the Symbol, Volume, and Time fields, respectively.

  18. Click Send Data, and observe this line in the Application Output view:

    Symbol=msft, Volume=100, Time=25

    Note that two passes are insufficient to order this input stream.

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

Running Bsort.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 three terminal windows on UNIX, or three 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 Bsort.sbapp.

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

  3. In window 2, type:

    sbc dequeue

    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 StockIn

    The sbc command is now awaiting keyboard input. Then type: msft,100,10.

    No output is displayed yet in the dequeue window.

  5. Type:

    msft, 100, 30

    No output is displayed yet in the dequeue window.

  6. Type:

    intc, 100, 5

    Observe this line in the dequeue window: StockOut,intc,100,5.

  7. Type:

    msft, 100, 25

    Observe this line in the dequeue window: StockOut,msft,100,10.

  8. Type:

    amat, 100, 2

    Observe this line in the dequeue window: StockOut,amat,100,2.

  9. Type:

    intc, 100, 15

    Observe this line in the dequeue window: StockOut,intc,100,15.

  10. Type:

    msft, 100, 40

    Observe this line in the dequeue window: StockOut,msft,100,25.

    Note that two passes are insufficient to order this input stream.

  11. Press Ctrl+Z (Windows) or Ctrll+D (UNIX) in windows 2 and 3 to stop the sbc sessions.

  12. In window 2 or 3, enter sbadmin shutdown to stop the server.

Modifying and Running Bsort.sbapp to Fully Sort the Input Stream in StreamBase Studio

  1. Return to the Authoring Perspective.

  2. In the Package Explorer, right-click on Bsort.sbapp, and select Open.

  3. In the Bsort.sbapp view, click on the myBSort operator.

  4. In the Properties view, click on the Sort Settings tab.

  5. Change the value in the Tuples, using a buffer size of field from 2 to 6.

  6. Click FileSave As, enter a new application name, and click OK.

  7. Select the modified application in the Package Explorer, then click the Run button.

  8. In the Application Output view, select the StockOut 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.

  9. In the Manual Input view, select the StockIn input stream.

  10. Enter msft, 100, and 10 in the Symbol, Volume, and Time fields, respectively.

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

  12. Enter msft, 100, and 30 in the Symbol, Volume, and Time fields, respectively.

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

  14. Enter intc, 100, and 5 in the Symbol, Volume, and Time fields, respectively.

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

  16. Enter msft, 100, and 25 in the Symbol, Volume, and Time fields, respectively.

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

  18. Enter amat, 100, and 2 in the Symbol, Volume, and Time fields, respectively.

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

  20. Enter intc, 100, and 15 in the Symbol, Volume, and Time fields, respectively.

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

  22. Enter msft, 100, and 40 in the Symbol, Volume, and Time fields, respectively.

  23. Click Send Data, and observe this line in the Application Output view:

    Symbol=amat, Volume=100, Time=2

  24. Enter intc, 100, and 20 in the Symbol, Volume, and Time fields, respectively.

  25. Click Send Data, and observe this line in the Application Output view:

    Symbol=intc, Volume=100, Time=5

  26. Enter intc, 100, and 18 in the Symbol, Volume, and Time fields, respectively.

  27. Click Send Data, and observe this line in the Application Output view:

    Symbol=msft, Volume=100, Time=10

    Note that 6 passes are sufficient to order this input stream.

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

Modifying and Running Bsort.sbapp to Fully Sort the Input Stream in Terminal Windows

  1. In StreamBase Studio, double-click your copy of the sbapp file to open it.

  2. Change the value in the Tuple buffer size field from 2 to 6.

  3. Click OK.

  4. Save the application.

  5. Open three terminal windows on UNIX, or three StreamBase Command Prompts on Windows. In each window, navigate to your workspace copy of the sample, as described above.

  6. In window 1, type:

    sbd Bsort.sbapp

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

  7. In window 2, type:

    sbc dequeue

    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.

  8. In window 3, type:

    sbc enqueue StockIn

    The sbc command is now awaiting keyboard input. Then type: msft,100,10.

    No output is displayed yet in the dequeue window.

  9. Type:

    msft, 100, 30

    No output is displayed yet in the dequeue window.

  10. Type:

    intc, 100, 5

    No output is displayed yet in the dequeue window.

  11. Type:

    msft, 100, 25

    No output is displayed yet in the dequeue window.

  12. Type:

    amat, 100, 2

    No output is displayed yet in the dequeue window.

  13. Type:

    intc, 100, 15

    No output is displayed yet in the dequeue window.

  14. Type:

    msft, 100, 40

    Observe this line in the dequeue window: StockOut,amat,100,2.

  15. Type:

    intc, 100, 20

    Observe this line in the dequeue window: StockOut,intc,100,5.

  16. Type:

    intc, 100, 18

    Observe this line in the dequeue window: StockOut,msft,100,10

    Note that 6 passes are sufficient to order this input stream.

  17. Press Ctrl+Z (Windows) or Ctrl+D (UNIX) to exit the sbc session.

  18. In window 3, type:

    sbadmin shutdown

    This command terminates the server and dequeuer.

Tip

The Group By fields can be used to order within a set of tuples, where the value of the Expression is the same. (The Expression can simply be an input field.) This sets up a buffer for each set of tuples rather one buffer for all the tuples in the stream.

Back to Top ^

Importing This Sample into StreamBase Studio

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

  • From the top menu, select 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.