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.

Importing This Sample into StreamBase Studio

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

  • From the top-level menu, click File>Load StreamBase Sample.

  • Enter 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 This Sample in StreamBase Studio

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

    If you see red marks on a project folder, wait a moment for the project to load its features.

    If the red marks do not resolve themselves after a minute, select the project, right-click, and select Maven>Update Project from the context menu.

  2. Open the src/main/eventflow/com.tibco.sb.sample.operator folder.

  3. Open the Join.sbapp file and click the Run button. This opens the SB Test/Debug perspective and starts the module.

  4. In the Output Streams 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.

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

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

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

  8. Select the ComstockIn input stream.

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

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

  11. Select the ReutersIn input stream.

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

  13. Click Send Data, and observe this data appears in the Output Streams view

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

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

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

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

  18. Click Send Data, and observe this data appears in the Output Streams 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
  19. Select the ReutersIn input stream.

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

  21. Click Send Data, and observe this data appears in the Output Streams view

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

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

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

  25. When done, press F9 or click the Terminate EventFlow Fragment 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.