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| 1 | +/* |
| 2 | + * Copyright 2002-2019 the original author or authors. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * https://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | +package org.springframework.messaging.rsocket.annotation.support; |
| 17 | + |
| 18 | +import java.util.ArrayList; |
| 19 | +import java.util.Arrays; |
| 20 | +import java.util.Collections; |
| 21 | +import java.util.List; |
| 22 | + |
| 23 | +import io.rsocket.RSocketFactory; |
| 24 | + |
| 25 | +import org.springframework.beans.BeanUtils; |
| 26 | +import org.springframework.lang.Nullable; |
| 27 | +import org.springframework.messaging.rsocket.ClientRSocketFactoryConfigurer; |
| 28 | +import org.springframework.messaging.rsocket.MetadataExtractor; |
| 29 | +import org.springframework.messaging.rsocket.RSocketStrategies; |
| 30 | +import org.springframework.util.Assert; |
| 31 | +import org.springframework.util.RouteMatcher; |
| 32 | + |
| 33 | +/** |
| 34 | + * {@link ClientRSocketFactoryConfigurer} to configure and plug in a responder |
| 35 | + * that handles requests via annotated handler methods. Effectively a thin layer over |
| 36 | + * {@link RSocketMessageHandler} that provides a programmatic way to configure |
| 37 | + * it and obtain a responder via {@link RSocketMessageHandler#clientResponder() |
| 38 | + * clientResponder()}. |
| 39 | + * |
| 40 | + * @author Rossen Stoyanchev |
| 41 | + * @since 5.2 |
| 42 | + */ |
| 43 | +public final class AnnotationClientResponderConfigurer implements ClientRSocketFactoryConfigurer { |
| 44 | + |
| 45 | + private final List<Object> handlers = new ArrayList<>(); |
| 46 | + |
| 47 | + @Nullable |
| 48 | + private RouteMatcher routeMatcher; |
| 49 | + |
| 50 | + @Nullable |
| 51 | + private MetadataExtractor extractor; |
| 52 | + |
| 53 | + @Nullable |
| 54 | + private RSocketStrategies strategies; |
| 55 | + |
| 56 | + |
| 57 | + private AnnotationClientResponderConfigurer(List<Object> handlers) { |
| 58 | + for (Object obj : handlers) { |
| 59 | + this.handlers.add(obj instanceof Class ? BeanUtils.instantiateClass((Class<?>) obj) : obj); |
| 60 | + } |
| 61 | + } |
| 62 | + |
| 63 | + |
| 64 | + /** |
| 65 | + * Configure the {@link RouteMatcher} to use. This is used to set |
| 66 | + * {@link RSocketMessageHandler#setRouteMatcher(RouteMatcher)}. |
| 67 | + */ |
| 68 | + public AnnotationClientResponderConfigurer routeMatcher(RouteMatcher routeMatcher) { |
| 69 | + this.routeMatcher = routeMatcher; |
| 70 | + return this; |
| 71 | + } |
| 72 | + |
| 73 | + /** |
| 74 | + * Configure the {@link MetadataExtractor} to use. This is used to set |
| 75 | + * {@link RSocketMessageHandler#setMetadataExtractor(MetadataExtractor)}. |
| 76 | + */ |
| 77 | + public AnnotationClientResponderConfigurer metadataExtractor(MetadataExtractor extractor) { |
| 78 | + this.extractor = extractor; |
| 79 | + return this; |
| 80 | + } |
| 81 | + |
| 82 | + /** |
| 83 | + * Configure handlers to detect {@code @MessasgeMapping} handler methods on. |
| 84 | + * This is used to set {@link RSocketMessageHandler#setHandlers(List)}. |
| 85 | + */ |
| 86 | + public AnnotationClientResponderConfigurer handlers(Object... handlers) { |
| 87 | + this.handlers.addAll(Arrays.asList(handlers)); |
| 88 | + return this; |
| 89 | + } |
| 90 | + |
| 91 | + |
| 92 | + // Implementation of ClientRSocketFactoryConfigurer |
| 93 | + |
| 94 | + @Override |
| 95 | + public void configureWithStrategies(RSocketStrategies strategies) { |
| 96 | + this.strategies = strategies; |
| 97 | + } |
| 98 | + |
| 99 | + @Override |
| 100 | + public void configure(RSocketFactory.ClientRSocketFactory factory) { |
| 101 | + Assert.notEmpty(this.handlers, "No handlers"); |
| 102 | + RSocketMessageHandler messageHandler = new RSocketMessageHandler(); |
| 103 | + messageHandler.setHandlers(this.handlers); |
| 104 | + if (this.routeMatcher != null) { |
| 105 | + messageHandler.setRouteMatcher(this.routeMatcher); |
| 106 | + } |
| 107 | + if (this.extractor != null) { |
| 108 | + messageHandler.setMetadataExtractor(this.extractor); |
| 109 | + } |
| 110 | + messageHandler.setRSocketStrategies(this.strategies); |
| 111 | + messageHandler.afterPropertiesSet(); |
| 112 | + factory.acceptor(messageHandler.clientResponder()); |
| 113 | + } |
| 114 | + |
| 115 | + |
| 116 | + // Static factory methods |
| 117 | + |
| 118 | + /** |
| 119 | + * Create an {@code AnnotationClientResponderConfigurer} with the given handlers |
| 120 | + * to check for {@code @MessasgeMapping} handler methods. |
| 121 | + */ |
| 122 | + public static AnnotationClientResponderConfigurer withHandlers(Object... handlers) { |
| 123 | + return new AnnotationClientResponderConfigurer(Arrays.asList(handlers)); |
| 124 | + } |
| 125 | + |
| 126 | + /** |
| 127 | + * Create an {@code AnnotationClientResponderConfigurer} to set up further. |
| 128 | + */ |
| 129 | + public static AnnotationClientResponderConfigurer create() { |
| 130 | + return new AnnotationClientResponderConfigurer(Collections.emptyList()); |
| 131 | + } |
| 132 | + |
| 133 | +} |
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