Pattern Operator Sample

About This Guide

This sample uses a Pattern operator to pass in only market data for securities that have already been traded. The MarketData input stream contains the fields symbol, price, and time. The TradeData input stream has the same fields plus a shares field.

This topic describes Pattern.sbapp, the Pattern operator sample application.

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 all the operator samples.

Running Pattern.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 Pattern.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 Output Streams view, select the RelevantMarketData output stream.

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

  7. Enter GOOG, 10 and 1 in the symbol, price, and time fields, respectively.

  8. Click Send Data, and observe that no data appears on the RelevantMarketData stream, as there have been no trades in GOOG.

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

  10. Enter GOOG, 10, 20, and 2 in the symbol, price, shares, and time fields, respectively.

  11. In the Manual Input view, reselect the MarketData input stream.

  12. Change the values of price and time to 11 and 3, respectively.

  13. Click Send Data, and observe that this data shows up on the output stream.

  14. Reselect the TradeData input stream.

  15. Change the values of symbol and time to YHOO and 4, respectively, and click Send Data.

  16. Reselect the MarketData input stream.

  17. Change the value of time to 5 and click Send Data. Notice that this information still shows up on the output stream.

  18. Change the value of symbol and time to YHOO and 6, respectively.

  19. Click Send Data, and observe that this data shows up on the output stream.

  20. 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.


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:


See Default Installation Directories for the default location of studio-workspace on your system.