Annotations attach additional information to individual complex event processing statements. Describe an annotation before the complex event processing statement to which you want to add information.
Annotation type | Notation | Explanation |
|---|---|---|
Name | @Name("Name") or @Name('Name') | Attaches Name to a complex event processing statement. Attaching a unique name makes it easier to distinguish output information during debugging. When you attach the same name to multiple complex event processing statements, two hyphens (--) and a number will be automatically appended to make unique names. |
SoapListener | @SoapListener("listenerDefinition") or @SoapListener('listenerDefinition') | Associates a listener definition with a SELECT statement. For listenerDefinition, specify the "development asset ID" specified at "listener definition". This passes the SELECT statement output as a SOAP message to the user-developed Web service specified in the listener definition. |
DebugLogListener | @DebugLogListener | Outputs logs for debugging complex event processing statements. |
LoggingListener | @LoggingListener(table="logStorageArea", properties="propertyNamesToBeOutput") or the same format but with single quotation marks (') instead of double quotation marks (") | Logs the complex event processing statement output results to logStorageArea. Specify the output destination of the Hadoop system in logStorageArea using a full path. Even if events are to be recorded in the engine log, specify with a virtual path name beginning with a slash (e.g., "/eventName") to distinguish events. In propertyNamesToBeOutput, specify the property names to be output by the complex event processing statement, separated by commas. |
VDW | @VDW(cacheName="cacheName", keyProperty="propertyNameCorrespondingToCacheKey") or the same format but with single quotation marks (') instead of double quotation marks (") | The annotation to be attached to the CREATE WINDOW statement that creates a Virtual Data Window. Refer to "1.3.1.3 Virtual Data Window Generation" for information on how to write a CREATE WINDOW statement. Specify the KEY-VALUE method cacheName accessed by the Virtual Data Window, and specify the propertyNameCorrespondingToCacheKey. |
Information
Annotation execution sequence
If the @SoapListener, @DebugLogListener, and @LoggingListener annotations are specified simultaneously for one complex event processing statement, the output processing of each annotation is executed in the sequence in which they are specified.
@SoapListener('LISTEN01')
@DebugLogListener
select gatewayId, value from EVENT_01;
In the above example, the sequence of output execution is @SoapListener, then @DebugLogListener.
