001/*-
002 * #%L
003 * HAPI FHIR JPA - Search Parameters
004 * %%
005 * Copyright (C) 2014 - 2025 Smile CDR, Inc.
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 *
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package ca.uhn.fhir.jpa.cache;
021
022import ca.uhn.fhir.model.primitive.IdDt;
023import org.hl7.fhir.instance.model.api.IIdType;
024
025import java.util.HashMap;
026import java.util.Map;
027import java.util.Set;
028
029/**
030 * This maintains a mapping of resource id to resource version.  We cache these in order to
031 * detect resources that were modified on remote servers in our cluster.
032 */
033public class ResourceVersionCache {
034        private final Map<IIdType, Long> myVersionMap = new HashMap<>();
035
036        public void clear() {
037                myVersionMap.clear();
038        }
039
040        /**
041         * @param theResourceId
042         * @param theVersion
043         * @return previous value
044         */
045        public Long put(IIdType theResourceId, Long theVersion) {
046                return myVersionMap.put(new IdDt(theResourceId).toVersionless(), theVersion);
047        }
048
049        public Long getVersionForResourceId(IIdType theResourceId) {
050                return myVersionMap.get(new IdDt(theResourceId));
051        }
052
053        public Long removeResourceId(IIdType theResourceId) {
054                return myVersionMap.remove(new IdDt(theResourceId));
055        }
056
057        public void initialize(ResourceVersionMap theResourceVersionMap) {
058                for (IIdType resourceId : theResourceVersionMap.keySet()) {
059                        myVersionMap.put(resourceId, theResourceVersionMap.get(resourceId));
060                }
061        }
062
063        public int size() {
064                return myVersionMap.size();
065        }
066
067        public Set<IIdType> keySet() {
068                return myVersionMap.keySet();
069        }
070}