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

java.lang.String

name Name

Optional Element Summary

java.lang.String	functionClose Close function.
java.lang.String	functionOpen Open function.
boolean	unique Indicator whether unique-key semantics should apply.

Element Detail

name

public abstract java.lang.String name

Name

Returns:

name

functionOpen

public abstract java.lang.String functionOpen

Open function.

Returns:

open function.

Default:

""

functionClose

public abstract java.lang.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