public interface JPAReaderPattern {

	/**
	 * This method is invoked during the job setup phase. 
	 * 
	 * @param props properties provided in the xJCL 
	 */
	
	public void initialize(Properties props);
	
	/**
	 * This method should retrieve values for the various columns for the current
    * row from the given Iterator object. Typically this data would be used
	 * to populate an intermediate object which would be returned
	 * @param listIt
	 * @return
	 */
	public Object fetchRecord(Iterator listIt);
	
	/**
	 * This method should return a JPQL query that will be used during setup of the 
	 * stream to retrieve all relevant data that would be processed part of the job
	 *  steps @return object to be used during process step.
	 */
	public String getInitialLookupQuery();
	
	/**
	 * This method gets called during Job Restart. The restart token should be used 
	 * to create an JPQL query that will retrieve previously unprocessed records. 
	 * Typically the restart token would be the primary key in the table and the 
	 * query would get all rows with primary key value > restarttoken
	 * @param restartToken
	 * @return The restart query
	 */
	public String getRestartQuery(String restartToken);
	
	/**
	 * This method gets called just before a checkpoint is taken.
	 * @return The method should return a string value identifying the last record
    * read by the stream.
	 */
	public String getRestartTokens();
		
}