Contents
This sample uses a Metronome operator to output the current share price of all stocks every five seconds. The current prices are stored in a query table.
In StreamBase Studio, import this sample with the following steps:
-
From the top menu, click → .
-
Type
operatorto narrow the list of options. -
Select Operator sample group from the Data Constructs and Operators category.
-
Click .
StreamBase Studio creates a single project for the operator samples.
-
In the Project Explorer, open the sample you just loaded.
-
Open the
src/main/eventflowfolder. -
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).
-
Open the
Metronome.sbappapplication 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 → from the context menu.
-
In the Output Streams view, select the
CurrentPricesstream. Observe a tuple showing every five seconds, with the current time, a null symbol, and a null price. This indicates that no prices are currently known. Once we record some share prices, the nulls will be replaced with actual values. -
In the Manual Input view, enter
INTCfor symbol, and23.25for price. -
Click Send Data. Within five seconds, look for a tuple on the
CurrentPricesoutput stream, stating that the current price of INTC is 23.25. -
Enter
MSFTfor symbol, and25.75for price. -
Click Send Data. Within five seconds, look for two tuples emitted on the
CurrentPricesoutput stream. These tuples are repeated every five seconds. -
When done, press F9 or click the
Stop Running Application 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.
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.