BSort Operator Sample

About This 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.

Importing This Sample into StreamBase Studio

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

  • From the top menu, click FileLoad StreamBase Sample.

  • Type operator to narrow the list of options.

  • Select Operator sample group from the Data Constructs and Operators category.

  • Click OK.

StreamBase Studio creates a single project for the operator samples.

Running Bsort.sbapp in StreamBase Studio

  1. In the Project Explorer, open the sample you just loaded.

  2. Open the src/main/eventflow folder.

  3. 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).

  4. Open the Bsort.sbapp application 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 MavenUpdate Project from the context menu.

  5. 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.

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

  7. Enter msft, 100, and 10 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 msft, 100, and 30 in the Symbol, Volume, and Time fields, respectively.

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

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

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

    Symbol=intc, Volume=100, Time=5

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

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

    Symbol=msft, Volume=100, Time=10

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

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

    Symbol=amat, Volume=100, Time=2

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

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

    Symbol=intc, Volume=100, Time=15

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

  20. 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.

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

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 default location of studio-workspace on your system.