An input adapter is a program, usually running in the same JVM engine process as your EventFlow fragment, that converts data from an external source to the StreamBase tuple protocol. After adding an input adapter to an EventFlow canvas in StreamBase Studio, select or double-click its icon in the canvas to open its Properties view.
The Properties view for each adapter differs according to the capabilities offered by each adapter. The Properties view for input adapters always has a General tab, a Concurrency tab, and at least one Adapter Properties tab. Many adapters also have an Edit Schemas tab to specify the schema for tuples to be emitted output from the adapter.
Name: Use this field to specify or change the component's name, which must be unique in the application. The name must contain only alphabetic characters, numbers, and underscores, and no hyphens or other special characters. The first character must be alphabetic or an underscore.
Operator: A read-only field that shows the formal name of the adapter and the fully qualified class name that implements the functionality of this adapter. If you need to reference this class name elsewhere in your application, you can right-click this field and select Copy from the context menu to place the full class name in the system clipboard.
Start with application: If this field is set to Yes (default) or to a module parameter that evaluates to
true, this instance of this adapter starts as part of the JVM engine that runs this EventFlow fragment. If this field is set to
No or to a module parameter that evaluates to
false, the adapter instance is loaded with the engine, but does not start until you send an epadmin container resume command (or its sbadmin equivalent), or until you start the component with StreamBase Manager.
Enable Error Output Port: Select this check box to add an Error Port to this component. In the EventFlow canvas, the Error Port shows as a red output port, always the last port for the component. See Using Error Ports to learn about Error Ports.
Description: Optionally enter text to briefly describe the component's purpose and function. In the EventFlow canvas, you can see the description by pressing Ctrl while the component's tooltip is displayed.
Use one or more adapter properties tabs to configure the unique properties for each adapter. Some adapters have a single tab in the Properties view named Adapter Properties. Other adapters have property settings spread out over multiple tabs.
Refer to the Properties section of each adapter's topic in the Adapters Guide to understand the property settings available for each adapter.
Use the Edit Schema tab to specify the schema of outgoing tuples from this input adapter. This functionality is similar to the Edit Schema tab for Input Streams, as described in Defining Input Streams.
Use the Concurrency tab to specify parallel regions for this instance of this component, or multiplicity options, or both. The Concurrency tab settings are described in Concurrency Options, and dispatch styles are described in Dispatch Styles.
Concurrency settings are not suitable for every application, and using these settings requires a thorough analysis of your application. For details, see Execution Order and Concurrency, which includes important guidelines for using the concurrency options.