001/*
002 * Copyright 2006-2007 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.batch.repeat;
018
019
020/**
021 * Callback interface for batch operations. Many simple processes will be able
022 * to use off-the-shelf implementations of this interface, enabling the
023 * application developer to concentrate on business logic.
024 * 
025 * @see RepeatOperations
026 * 
027 * @author Dave Syer
028 * 
029 */
030public interface RepeatCallback {
031
032        /**
033         * Implementations return true if they can continue processing - e.g. there
034         * is a data source that is not yet exhausted. Exceptions are not necessarily
035         * fatal - processing might continue depending on the Exception type and the
036         * implementation of the caller.
037         * 
038         * @param context the current context passed in by the caller.
039         * @return an {@link RepeatStatus} which is continuable if there is (or may
040         * be) more data to process.
041         * @throws Exception if there is a problem with the processing.
042         */
043        RepeatStatus doInIteration(RepeatContext context) throws Exception;
044}