Sequence Operator Sample

Contents

Running Sequence.sbapp in StreamBase Studio
Running Sequence.sbapp in Terminal Windows
Importing This Sample into StreamBase Studio
Sample Location

This sample uses a Sequence operator to generate unique ID numbers for generic product orders, allowing for easy querying when updating orders. The Orders input stream contains the fields named productNum, quantity, and price. The OrdersChanges input stream contains the same fields plus an orderID field.

Running Sequence.sbapp in StreamBase Studio

  1. In the Package Explorer, double-click to open the Sequence.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 Manual Input view, select the Orders input stream.

  4. Enter G Washington, 12345678, 1000, and 4.30 in the name, productNum, quantity, and price fields, respectively.

  5. Click Send Data and observe that this order has been assigned a field orderID of 1.

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

  7. Enter 1 and 1350 in the orderID and quantity fields, respectively.

  8. In the Application Output view, note that the quantity of the previously entered order has been updated.

  9. Reselect the Orders input stream.

  10. Enter G Washington, 23456789, 900, and 12.50 in the name, productNum, quantity, and price fields, respectively.

  11. Click Send Data and observe that this order has been assigned a field orderID of 2.

  12. Reslect the OrderChanges input stream.

  13. Enter 2, 98765432, and 1900 in the orderID, productNum, and quantity fields, respectively.

  14. Click Send Data and observe that the second order input has been updated.

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

Running Sequence.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 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 Sequence.sbapp

    The window shows notice[StreamBaseServer] listening on port 10000

  3. In window 2: type:

    sbc dequeue OutputOrders

    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 OrderChanges

    The sbc command is now awaiting keyboard input.

  5. In window 4, type:

    sbc enqueue Orders

    The sbc command is now awaiting keyboard input. Then type: G Washington, 12345678, 1200, 4.30

    Observe this line in the dequeue window: G Washington,12345678,1200,4.300,1,null,null,null,null. Notice that this order has been assigned an orderID of 1 in the fifth field. (The null values at the end mean that this is a new order.)

  6. In window 3, type:

    1,null,null,1350,null

    Observe this line in the dequeue window: G Washington,12345678,1350,4.3,1,G Washington,12345678,1200,4.3

    The first set of values are the new order values and the second set of values (that were null before) show the old values.

  7. In window 4, type:

    G Washington, 23456789, 900, 12.50

    Observe this line in the dequeue window: G Washington,23456789,900,12.5,1,null,null,null,null

  8. In window 3, type:

    4, null, 98765432, 1900, null

    Observe this line in the dequeue window: G Washington,98765432,1900,12.5,4,G Washington,23456789,900,12.5

  9. In window 3 and 4 type Ctrl+C to stop the sbc commands.

  10. In window 3 or 4, type the following command to terminate the server and dequeuer:

    sbadmin shutdown

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Importing This Sample into StreamBase Studio

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

  • From the top menu, click File → Load StreamBase Sample.

  • Select operator from the Data Constructs and Operators category.

  • Click OK.

StreamBase Studio creates a single project for all the operator samples.

Sample Location

By default, the sample files are installed in:

  • On Windows: C:\Program Files\StreamBase Systems\StreamBase.n.m\sample\operator

  • On UNIX: /opt/streambase/sample/operator

When you load the sample into StreamBase Studio, Studio copies the sample project's files to your Studio workspace. StreamBase Systems recommends that you use the workspace copy of the sample, especially on UNIX, where you may not have write access to /opt/streambase. In the default installation, the path to this sample in your Studio workspace is: 

UNIX:       
  ~/streambase-studio-n.m-workspace/sample_operator
Windows XP:
  C:\Documents and Settings\username\My Documents\
      StreamBase Studio n.m Workspace\sample_operator
Windows 7 and Windows Vista:
  C:\Users\username\Documents\StreamBase Studio n.m Workspace\sample_operator