com.espertech.esper.client.annotation

Annotation Type ExternalDW

public @interface ExternalDW

Annotation for defining an external data window name and open/close functon.

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
String	name Name

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
String	functionClose Close function.
String	functionOpen Open function.
boolean	unique Indicator whether unique-key semantics should apply.

Element Detail

name

public abstract String name

Name

Returns:

name

functionOpen

public abstract String functionOpen

Open function.

Returns:

open function.

Default:

""

functionClose

public abstract String functionClose

Close function.

Returns:

close function

Default:

""

unique

public abstract boolean unique

Indicator whether unique-key semantics should apply.

This indicator is false by default meaning that the implementation should not assume unique-data-window semantics, and would not need to post the previous value of the key as a remove stream event.

Setting this indicator is interpreted by an implementation to assume unique-data-window semantics, thereby instructing to post the previous value for the currently-updated key as a remove stream event.

Returns:

unique-key semantics

Default:

false