001package ca.uhn.fhir.jpa.term.job;
002
003/*-
004 * #%L
005 * HAPI FHIR JPA Server
006 * %%
007 * Copyright (C) 2014 - 2022 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import org.slf4j.Logger;
024import org.slf4j.LoggerFactory;
025import org.springframework.batch.item.ItemReader;
026import org.springframework.beans.factory.annotation.Value;
027
028import static ca.uhn.fhir.jpa.batch.config.BatchConstants.JOB_PARAM_CODE_SYSTEM_VERSION_ID;
029
030/**
031 * This reader works as a pass-through by passing the received parameter once to the writer,
032 * in order to share the writer functionality between two jobs
033 */
034public class BatchTermCodeSystemUniqueVersionDeleteReader implements ItemReader<Long> {
035        private static final Logger ourLog = LoggerFactory.getLogger(BatchTermCodeSystemUniqueVersionDeleteReader.class);
036
037        @Value("#{jobParameters['" + JOB_PARAM_CODE_SYSTEM_VERSION_ID  + "']}")
038        private Long myTermCodeSystemVersionPid;
039
040        // indicates if the parameter was already passed once to the writer, which indicates end of task
041        private boolean myParameterPassed;
042
043
044        @Override
045        public Long read() throws Exception {
046                if ( ! myParameterPassed) {
047                        myParameterPassed = true;
048                        return myTermCodeSystemVersionPid;
049                }
050
051                return null;
052        }
053
054}