001/*-
002 * #%L
003 * HAPI FHIR Storage api
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.subscription.channel.impl;
021
022import ca.uhn.fhir.broker.api.ChannelConsumerSettings;
023import ca.uhn.fhir.broker.api.ChannelProducerSettings;
024import ca.uhn.fhir.broker.api.IChannelNamer;
025import ca.uhn.fhir.broker.api.IChannelSettings;
026import ca.uhn.fhir.broker.jms.ISpringMessagingChannelProducer;
027import ca.uhn.fhir.subscription.SubscriptionConstants;
028import ca.uhn.fhir.util.ThreadPoolUtil;
029import jakarta.annotation.Nonnull;
030import jakarta.annotation.PreDestroy;
031import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
032
033import java.util.Collections;
034import java.util.HashMap;
035import java.util.Map;
036
037public class LinkedBlockingChannelFactory {
038
039        private final IChannelNamer myChannelNamer;
040        private final Map<String, LinkedBlockingChannel> myChannels = Collections.synchronizedMap(new HashMap<>());
041
042        protected RetryPolicyProvider myRetryPolicyProvider;
043
044        public LinkedBlockingChannelFactory(IChannelNamer theChannelNamer, RetryPolicyProvider theRetryPolicyProvider) {
045                myChannelNamer = theChannelNamer;
046                myRetryPolicyProvider = theRetryPolicyProvider;
047        }
048
049        public LinkedBlockingChannel getOrCreateReceiver(
050                        String theChannelName, ChannelConsumerSettings theChannelSettings) {
051                return getOrCreateChannel(theChannelName, theChannelSettings.getConcurrentConsumers(), theChannelSettings);
052        }
053
054        public ISpringMessagingChannelProducer getOrCreateProducer(
055                        String theChannelName, ChannelProducerSettings theChannelSettings) {
056                return getOrCreateChannel(theChannelName, theChannelSettings.getConcurrentConsumers(), theChannelSettings);
057        }
058
059        public IChannelNamer getChannelNamer() {
060                return myChannelNamer;
061        }
062
063        private LinkedBlockingChannel getOrCreateChannel(
064                        String theChannelName, int theConcurrentConsumers, IChannelSettings theChannelSettings) {
065                // TODO - does this need retry settings?
066                final String channelName = myChannelNamer.getChannelName(theChannelName, theChannelSettings);
067
068                return myChannels.computeIfAbsent(
069                                channelName, t -> buildLinkedBlockingChannel(theConcurrentConsumers, channelName));
070        }
071
072        @Nonnull
073        protected LinkedBlockingChannel buildLinkedBlockingChannel(int theConcurrentConsumers, String theChannelName) {
074                String threadNamePrefix = theChannelName + "-";
075                ThreadPoolTaskExecutor threadPoolExecutor = ThreadPoolUtil.newThreadPool(
076                                theConcurrentConsumers,
077                                theConcurrentConsumers,
078                                threadNamePrefix,
079                                SubscriptionConstants.DELIVERY_EXECUTOR_QUEUE_SIZE);
080
081                return new LinkedBlockingChannel(
082                                theChannelName, threadPoolExecutor, threadPoolExecutor::getQueueSize, myRetryPolicyProvider);
083        }
084
085        @PreDestroy
086        public void stop() {
087                myChannels.clear();
088        }
089}