/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* 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.epl.db;
import com.espertech.esper.client.EventBean;
import java.util.List;
/**
* Interface for polling data from a data source such as a relational database.
* <p>
* Lifecycle methods are for managing connection resources.
*/
public interface PollExecStrategy
{
/**
* Start the poll, called before any poll operation.
*/
public void start();
/**
* Poll events using the keys provided.
* @param lookupValues is keys for exeuting a query or such
* @return a list of events for the keys
*/
public List<EventBean> poll(Object[] lookupValues);
/**
* Indicate we are done polling and can release resources.
*/
public void done();
/**
* Indicate we are no going to use this object again.
*/
public void destroy();
}