001/*
002 * Copyright 2008-2009 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 */
016package org.springframework.batch.core.partition.support;
017
018import java.util.Collection;
019
020import org.springframework.batch.core.StepExecution;
021
022/**
023 * Strategy for a aggregating step executions, usually when they are the result
024 * of partitioned or remote execution.
025 * 
026 * @author Dave Syer
027 * 
028 * @since 2.1
029 * 
030 */
031public interface StepExecutionAggregator {
032
033        /**
034         * Take the inputs and aggregate, putting the aggregates into the result.
035         * 
036         * @param result the result to overwrite
037         * @param executions the inputs
038         */
039        void aggregate(StepExecution result, Collection<StepExecution> executions);
040
041}