spring RestTemplateAutoConfiguration 源码

springboot RestTemplateAutoConfiguration 代码

文件路径：/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/client/RestTemplateAutoConfiguration.java

/*
 * Copyright 2012-2022 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.springframework.boot.autoconfigure.web.client;

import java.util.stream.Collectors;

import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
import org.springframework.boot.autoconfigure.condition.NoneNestedConditions;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration;
import org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration.NotReactiveWebApplicationCondition;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.boot.web.client.RestTemplateCustomizer;
import org.springframework.boot.web.client.RestTemplateRequestCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Lazy;
import org.springframework.web.client.RestTemplate;

/**
 * {@link EnableAutoConfiguration Auto-configuration} for {@link RestTemplate}.
 *
 * @author Stephane Nicoll
 * @author Phillip Webb
 * @since 1.4.0
 */
@AutoConfiguration(after = HttpMessageConvertersAutoConfiguration.class)
@ConditionalOnClass(RestTemplate.class)
@Conditional(NotReactiveWebApplicationCondition.class)
public class RestTemplateAutoConfiguration {

	@Bean
	@Lazy
	@ConditionalOnMissingBean
	public RestTemplateBuilderConfigurer restTemplateBuilderConfigurer(
			ObjectProvider<HttpMessageConverters> messageConverters,
			ObjectProvider<RestTemplateCustomizer> restTemplateCustomizers,
			ObjectProvider<RestTemplateRequestCustomizer<?>> restTemplateRequestCustomizers) {
		RestTemplateBuilderConfigurer configurer = new RestTemplateBuilderConfigurer();
		configurer.setHttpMessageConverters(messageConverters.getIfUnique());
		configurer.setRestTemplateCustomizers(restTemplateCustomizers.orderedStream().collect(Collectors.toList()));
		configurer.setRestTemplateRequestCustomizers(
				restTemplateRequestCustomizers.orderedStream().collect(Collectors.toList()));
		return configurer;
	}

	@Bean
	@Lazy
	@ConditionalOnMissingBean
	public RestTemplateBuilder restTemplateBuilder(RestTemplateBuilderConfigurer restTemplateBuilderConfigurer) {
		RestTemplateBuilder builder = new RestTemplateBuilder();
		return restTemplateBuilderConfigurer.configure(builder);
	}

	static class NotReactiveWebApplicationCondition extends NoneNestedConditions {

		NotReactiveWebApplicationCondition() {
			super(ConfigurationPhase.PARSE_CONFIGURATION);
		}

		@ConditionalOnWebApplication(type = Type.REACTIVE)
		private static class ReactiveWebApplication {

		}

	}

}

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