| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.rocketmq.eventbridge.infrastructure.validate.spi; |
| |
| import lombok.AccessLevel; |
| import lombok.NoArgsConstructor; |
| import lombok.SneakyThrows; |
| import org.apache.rocketmq.eventbridge.infrastructure.validate.spi.annotation.SingletonSPI; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.LinkedList; |
| import java.util.Map; |
| import java.util.ServiceLoader; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * validation service loader. |
| */ |
| @NoArgsConstructor(access = AccessLevel.PRIVATE) |
| public final class ValidationServiceLoader { |
| |
| private static final Map<Class<?>, Collection<Object>> SERVICES = new ConcurrentHashMap<>(); |
| |
| /** |
| * Register service. |
| * |
| * @param serviceInterface service interface |
| */ |
| public static void register(final Class<?> serviceInterface) { |
| if (!SERVICES.containsKey(serviceInterface)) { |
| SERVICES.put(serviceInterface, load(serviceInterface)); |
| } |
| } |
| |
| private static <T> Collection<Object> load(final Class<T> serviceInterface) { |
| Collection<Object> result = new LinkedList<>(); |
| for (T each : ServiceLoader.load(serviceInterface)) { |
| result.add(each); |
| } |
| return result; |
| } |
| |
| /** |
| * Get service instances. |
| * |
| * @param serviceInterface service interface |
| * @param <T> type of service |
| * @return service instances |
| */ |
| public static <T> Collection<T> getServiceInstances(final Class<T> serviceInterface) { |
| return null == serviceInterface.getAnnotation(SingletonSPI.class) ? createNewServiceInstances(serviceInterface) : getSingletonServiceInstances(serviceInterface); |
| } |
| |
| @SneakyThrows(ReflectiveOperationException.class) |
| @SuppressWarnings("unchecked") |
| private static <T> Collection<T> createNewServiceInstances(final Class<T> serviceInterface) { |
| if (!SERVICES.containsKey(serviceInterface)) { |
| return Collections.emptyList(); |
| } |
| Collection<Object> services = SERVICES.get(serviceInterface); |
| if (services.isEmpty()) { |
| return Collections.emptyList(); |
| } |
| Collection<T> result = new LinkedList<>(); |
| for (Object each : services) { |
| result.add((T) each.getClass().getDeclaredConstructor().newInstance()); |
| } |
| return result; |
| } |
| |
| @SuppressWarnings("unchecked") |
| private static <T> Collection<T> getSingletonServiceInstances(final Class<T> serviceInterface) { |
| return (Collection<T>) SERVICES.getOrDefault(serviceInterface, Collections.emptyList()); |
| } |
| } |