Contents
This topic describes AggregateByField.sbapp, the
Aggregate operator field dimension sample.
In StreamBase Studio, import this sample with the following steps:
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From the top-level menu, click >.
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Enter
sample groupto narrow the list of options. -
Select Operator sample group from the Data Constructs and Operators category.
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Click .
StreamBase Studio creates a single project for the operator samples.
In this sample, the Aggregate operator uses a field-based dimension to sum the volume of trades in a particular stock over 30 second windows, advancing every 30 seconds. It also ensures that the aggregation works for intermixed tuples for different stocks.
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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.
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Open the
src/main/eventflow/com.tibco.sb.sample.operatorfolder. -
Open the
AggregateByField.sbappfile and click the
Run button. This opens the SB
Test/Debug perspective and starts the module.
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In the Output Streams view, select the OutputChunkedTrades output stream. No output is displayed at this point, but the dequeuer is prepared to receive output. This view will eventually show the output of the application.
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In the Manual Input view, enter
7,AMAT, and100in the Time, Symbol, and Volume fields, respectively. Note that strings in StreamBase are case sensitive, so "AMAT" is not the same as "amat". -
Click , and observe that no output is displayed yet in the Output Streams view.
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Enter
10,AMAT, and100in the Time, Symbol, and Volume fields, respectively. -
Click , and observe that no output is displayed yet in the Output Streams view.
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Enter
20,AMAT, and200in the Time, Symbol, and Volume fields, respectively. -
Click , and observe that no output is displayed yet in the Output Streams view.
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Enter
40,AMAT, and100in the Time, Symbol, and Volume fields, respectively. -
Click , and observe this line in the Output Streams view:
Symbol=AMAT, TimeChunk=0, TotalVolume=400
Tip
If output data is too long to easily see in the Output Streams grid, click a row to display its field data in the Display Fields pane below the table.
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Enter
41,AMAT, and100in the Time, Symbol, and Volume fields, respectively. -
Click , and observe that no output is displayed in the Output Streams view.
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Enter
45,INTC, and100in the Time, Symbol, and Volume fields, respectively. -
Click , and observe that no output is displayed in the Output Streams view.
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Enter
50,AMAT, and200in the Time, Symbol, and Volume fields, respectively. -
Click , and observe that no output is displayed in the Output Streams view.
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Enter
55,INTC, and300in the Time, Symbol, and Volume fields, respectively. -
Click , and observe that no output is displayed in the Output Streams view.
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Enter
65,AMAT, and100in the Time, Symbol, and Volume fields, respectively. -
Click , and observe these lines in the Output Streams view.
Symbol=AMAT, TimeChunk=30, TotalVolume=400
Symbol=INTC, TimeChunk=30, TotalVolume=400 -
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.
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_operator
See Default Installation
Directories for the default location of studio-workspace on your system.