Java Operator Complex Types Sample

The ComplexTypeRunner.sbapp sample demonstrates how to use the StreamBase Client API to retrieve fields and values from complicated structures from a tuple, such as a list of integers or a list of tuples that contain a double.

The following files are included in the sample's project:

  • ComplexTypeAccessor.java: The source code for a Customer Java Operator which takes in two complex fields, 'intList' (a list of integers) and 'tupleList' (a list of tuples, each of which has a double field 'innerDouble'). The operator emits two additional fields, 'intListSum' (a sum of all integer values in the 'intList' field) and 'tupleListSum' (a sum of all 'innerDouble' values from all tuples contained in the 'tupleList' list)

  • ComplexTypeRunner.sbapp: A simple EventFlow application which uses the ComplexTypeAccessor Custom Java Operator to emit the summed integer/double values as described above.

  • sbd.sbconf: A StreamBase Server configuration file containing a reference to the java-bin directory containing the ComplexTypeAccessor Java class.

For details about how we used the API to extend com.streambase.sb.operator.*, see Using the StreamBase Java Operator Wizard in the API Guide. For information about importing a JAR that contains a Java Operator in StreamBase Studio, and then selecting an Operator class from that JAR, see Using Java Operators in the Authoring Guide.

For details about using custom icons with your Java operators, see the Java Client library documentation for getIconResource in com.streambase.sb.operator.Operator

Note

The Java code in this sample is delivered only in source code form. To build the code, you must load the sample into StreamBase Studio, which automatically builds the Java code.

Running the Sample in StreamBase Studio

  1. In the Package Explorer view, right-click on ComplexTypeRunner.sbapp, and select Run AsStreamBase Application. This opens the SB Test/Debug perspective and starts the application.

  2. In the Manual Input tab, add two intList elements and enter the values: intList[0] = 1 intList[1] = 2 Also add two tupleList elements and enter the values: tupleList[0] > innerDouble = 1.0 tupleList[1] > innerDouble = 2.0 Once all values have been entered, click Send Data.

  3. In the Application Output view, note the summed values:

    intListSum = 3 tupleListSum = 3.0
  4. When done, press F9 or click the Stop Running Application button.

Running the Sample in Terminal Windows

  1. Open three terminal windows on UNIX, or three StreamBase Command Prompts on Windows. In each window, navigate to your workspace copy of the sample.

  2. In Window 1, start the application using the command: sbd -f sbd.sbconf ComplexTypeRunner.sbapp

  3. In Window 2, run the following command to dequeue tuples from the application's Output Stream: sbc dequeue OutputStream

  4. In Window 3, run the following command to enqueue tuples to the application's Input Stream: sbc enqueue InputStream

    Now enter the following field values: null,null,"[1,2]","[""null,1.0"",""null,2.0""]"

  5. In Window 2, observe the resulting output values for 'intListSum' and 'tupleListSum':

    3,3
  6. In Window 2, type: Ctrl+C to exit the sbc dequeue session.

  7. Again in Window 2, type the following command to terminate the sbd server instance: sbadmin shutdown

Importing This Sample into StreamBase Studio

In StreamBase Studio, import this sample with the following steps:

  • From the top menu, select FileLoad StreamBase Sample.

  • Select Java Operator Complex Types from the Extending StreamBase category.

  • Click OK.

StreamBase Studio creates a project for the sample.

Sample Location

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_javaoperator-complex-types

See Default Installation Directories for the 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/javaoperator-complex-types/

See Default Installation Directories for the default location of studio-workspace on your system.