Aggregate Operator Field Dimension Sample

About This Sample

This topic describes AggregateByField.sbapp, the Aggregate operator field dimension 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 AggregateByField.sbapp in StreamBase Studio

In this sample, the Aggregate operator uses a field-based dimension to sum the volume of trades in a particular stock over 30 second windows, advancing every 30 seconds. It also ensures that the aggregation works for intermixed tuples for different stocks.

  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 AggregateByField.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 OutputChunkedTrades 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, enter 7, AMAT, and 100 in the Time, Symbol, and Volume fields, respectively. Note that strings in StreamBase are case sensitive, so "AMAT" is not the same as "amat".

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

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

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

  10. Enter 20, AMAT, and 200 in the Time, Symbol, and Volume fields, respectively.

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

  12. Enter 40, AMAT, and 100 in the Time, Symbol, and Volume fields, respectively.

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

    Symbol=AMAT, TimeChunk=0, TotalVolume=400

    Tip

    If output data is too long to easily see in the Application Output table, click a row to display its field data in the Display Fields pane below the table.

  14. Enter 41, AMAT, and 100 in the Time, Symbol, and Volume fields, respectively.

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

  16. Enter 45, INTC, and 100 in the Time, Symbol, and Volume fields, respectively.

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

  18. Enter 50, AMAT, and 200 in the Time, Symbol, and Volume fields, respectively.

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

  20. Enter 55, INTC, and 300 in the Time, Symbol, and Volume fields, respectively.

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

  22. Enter 65, AMAT, and 100 in the Time, Symbol, and Volume fields, respectively.

  23. Click Send Data, and observe these lines in the Application Output view.

    Symbol=AMAT, TimeChunk=30, TotalVolume=400
    Symbol=INTC, TimeChunk=30, TotalVolume=400

  24. 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.