Aggregate Operator Field Dimension Sample

This topic describes AggregateByField.sbapp, the Aggregate operator field dimension sample.

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 Package Explorer, double-click to open the AggregateByField.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 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.

  4. 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".

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

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

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

  8. Enter 20, AMAT, and 200 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 40, AMAT, and 100 in the Time, Symbol, and Volume fields, respectively.

  11. 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.

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

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

  14. Enter 45, INTC, 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 50, AMAT, and 200 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 55, INTC, and 300 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 65, AMAT, and 100 in the Time, Symbol, and Volume fields, respectively.

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

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

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

Running AggregateByField.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 AggregateByField.sbapp.

    The window shows:

    notice[StreamBaseServer] listening on port 10000

  3. In window 2, type sbc dequeue OutputChunkedTrades.

    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 TradesIn.

    The sbc command is now awaiting keyboard input. Then type:

    7,AMAT,100

    No output is displayed yet in the dequeue window.

  5. Type:

    10,AMAT,100

    No output is displayed yet in the dequeue window.

  6. Type:

    20,AMAT,200

    No output is displayed yet in the dequeue window.

  7. Type:

    40,AMAT,100

    Observe this line in the dequeue window: AMAT,0,400

  8. Type:

    41,AMAT,100

    No output is displayed in the dequeue window.

  9. Type:

    45,INTC,100

    No output is displayed in the dequeue window.

  10. Type:

    50,AMAT,200

    No output is displayed in the dequeue window.

  11. Type:

    55,INTC,300

    No output is displayed in the dequeue window.

  12. Type:

    65,AMAT,100

    Observe these lines in the dequeue window:

    AMAT,30,400
    INTC,30,400

  13. Press Control+Z (Windows) or Control+D (UNIX).

    The sbc process will exit.

  14. In window 3, type the following command to terminate the server and dequeuer:

    sbadmin shutdown

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.