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.
In StreamBase Studio, import this sample with the following steps:
From the top-level menu, click> .
sample groupto narrow the list of options.
Select Operator sample group from the Data Constructs and Operators category.
StreamBase Studio creates a single project for the operator samples.
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> from the context menu.
HeartbeatAggregate.sbappfile and click the Run button. This opens the SB Test/Debug perspective and starts the module.
In the Output Streams 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
IBMfor symbol, and
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 Terminate EventFlow Fragment button.
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.