001/* 002 * Copyright 2013-2018 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; 017 018/** 019 * Strategy interface for the generation of the key used in identifying 020 * unique {@link JobInstance}. 021 * 022 * @author Michael Minella 023 * @author Mahmoud Ben Hassine 024 * 025 * @param <T> The type of the source data used to calculate the key. 026 * @since 2.2 027 */ 028public interface JobKeyGenerator<T> { 029 030 /** 031 * Method to generate the unique key used to identify a job instance. 032 * 033 * @param source Source information used to generate the key (must not be {@code null}) 034 * 035 * @return a unique string identifying the job based on the information 036 * supplied 037 */ 038 String generateKey(T source); 039}