001package ca.uhn.fhir.jpa.interceptor;
002
003/*-
004 * #%L
005 * HAPI FHIR JPA Server
006 * %%
007 * Copyright (C) 2014 - 2021 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 ca.uhn.fhir.interceptor.api.Hook;
024import ca.uhn.fhir.interceptor.api.Interceptor;
025import ca.uhn.fhir.interceptor.api.Pointcut;
026import ca.uhn.fhir.jpa.searchparam.SearchParameterMap;
027import org.apache.commons.lang3.Validate;
028
029/**
030 * This interceptor for the HAPI FHIR JPA server forces all queries to
031 * be performed as offset queries. This means that the query cache will
032 * not be used and searches will never result in any writes to the
033 * database.
034 */
035@Interceptor
036public class ForceOffsetSearchModeInterceptor {
037
038        private Integer myDefaultCount = 100;
039
040        public void setDefaultCount(Integer theDefaultCount) {
041                Validate.notNull(theDefaultCount, "theDefaultCount must not be null");
042                myDefaultCount = theDefaultCount;
043        }
044
045        @Hook(Pointcut.STORAGE_PRESEARCH_REGISTERED)
046        public void storagePreSearchRegistered(SearchParameterMap theMap) {
047                if (theMap.getOffset() == null) {
048                        theMap.setOffset(0);
049                }
050                if (theMap.getCount() == null) {
051                        theMap.setCount(myDefaultCount);
052                }
053        }
054
055}