Sequence Operator Sample

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.

Click the Run button. This opens the SB Test/Debug perspective and starts the application.

In the Manual Input view, select the Orders input stream.

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

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

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

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

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

Reselect the Orders input stream.

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

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

Reselect the OrderChanges input stream.

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

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

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

Open terminal windows on UNIX, or four 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.

In window 1, type:

sbd Sequence.sbapp

The window shows notice[StreamBaseServer] listening on port 10000

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.

In window 3, type:

sbc enqueue OrderChanges

The sbc command is now awaiting keyboard input.

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,12345678,1200,4.3,1,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.)

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.

In window 4, type:

G Washington, 23456789, 900, 12.50

Observe this line in the dequeue window: G Washington,23456789,900,12.5,2,null,null,null,null

In window 3, type:

2, null, 98765432, 1900, null

Observe this line in the dequeue window: G Washington,98765432,1900,12.5,2,G Washington,23456789,900,12.5

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

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

sbadmin shutdown