/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.client.annotation;
/**
* Annotation for defining an external data window name and open/close functon.
*/
public @interface ExternalDW {
/**
* Name
*
* @return name
*/
String name();
/**
* Open function.
*
* @return open function.
*/
String functionOpen() default "";
/**
* Close function.
*
* @return close function
*/
String functionClose() default "";
/**
* Indicator whether unique-key semantics should apply.
* <p>
* 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.
* </p>
* <p>
* 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.
* </p>
*
* @return unique-key semantics
*/
boolean unique() default false;
}