Contents
The HeartbeatAggregate.sbapp sample uses a Heartbeat operator to output the number of stock quotes received every five seconds. The actual counting is
done by an Aggregate operator, but it depends on the Heartbeat to trigger output during periods when no quotes are received.
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In the Package Explorer, double-click to open the
HeartbeatAggregate.sbappapplication. 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.
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In the Application Output view, select the
TicCountsstream. No output is displayed at this point, but the Output View is prepared to receive output. This view will eventually show the output of the application. -
In the Manual Input view, select the
InputTicsinput stream -
Enter
IBMfor symbol, and83.17for price. -
Click Send Data. Within five seconds, look for a tuple on the
TicCountsoutput stream, stating that one quote was received in the last five seconds. -
Click Send Data three times in rapid succession. Within five seconds, look for a tuple on the
TicCountsoutput stream, stating that three quotes were received in the last five seconds. -
Wait five seconds and look for a tuple on the
TicCountsoutput stream, stating that zero quotes were received in the last five seconds. -
When done, press F9 or click the
Stop Running Application button.
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.
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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.
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In window 1, type:
sbd HeartbeatAggregate.sbappThe window shows
notice[StreamBaseServer] listening on port 10000. -
In window 2, type:
sbc dequeue TicCountsNo output is displayed at this point, but the dequeuer is prepared to receive output of the application.
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In window 3, type:
echo IBM,84.17 | sbc enqueue SetPriceWithin five seconds, look for a tuple in the dequeue window stating that one quote was received in the last five seconds.
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Wait five seconds and look for another tuple in the dequeue window stating that zero quotes were received in the last five seconds.
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In window 2, type: Ctrl+Z (Windows) or Ctrl+D (UNIX) to exit the sbc session.
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In window 3, type the following command to terminate the server and dequeuer:
sbadmin shutdown
In StreamBase Studio, import this sample with the following steps:
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From the top menu, click → .
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Select operator from the Data Constructs and Operators category.
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Click OK.
StreamBase Studio creates a single project for the operator samples.
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_operatorSee Default Installation Directories for the default 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/operatorSee Default Installation Directories for the default location of studio-workspace on your system.