me.ahoo.coapi.spring.client.sync.RestClientFactoryBean.kt Maven / Gradle / Ivy

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Streamlining HTTP client definition in Spring 6, CoApi provides zero boilerplate code auto-configuration for more convenient and efficient interface calls.

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/*
 * Copyright [2022-present] [ahoo wang  (https://github.com/Ahoo-Wang)].
 * 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
 *      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 me.ahoo.coapi.spring.client.sync

import me.ahoo.coapi.spring.CoApiDefinition
import org.springframework.cloud.client.loadbalancer.LoadBalancerInterceptor
import org.springframework.cloud.client.loadbalancer.reactive.LoadBalancedExchangeFilterFunction
import org.springframework.web.client.RestClient

class RestClientFactoryBean(definition: CoApiDefinition) : AbstractRestClientFactoryBean(definition) {
    companion object {
        private val loadBalancerInterceptorClass = LoadBalancerInterceptor::class.java
    }

    override val builderCustomizer: RestClientBuilderCustomizer by lazy {
        if (!loadBalanced()) {
            return@lazy RestClientBuilderCustomizer.NoOp
        }
        return@lazy LoadBalancedRestClientBuilderCustomizer()
    }

    inner class LoadBalancedRestClientBuilderCustomizer : RestClientBuilderCustomizer {
        override fun customize(coApiDefinition: CoApiDefinition, builder: RestClient.Builder) {
            builder.requestInterceptors {
                val hasLoadBalancedFilter = it.any { filter ->
                    filter is LoadBalancedExchangeFilterFunction
                }
                if (!hasLoadBalancedFilter) {
                    val loadBalancerInterceptor =
                        appContext.getBean(loadBalancerInterceptorClass)
                    it.add(loadBalancerInterceptor)
                }
            }
        }
    }
}