LoadBalancerEagerContextInitializerTest.java

/*
 * Copyright 2012-present 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.cloud.loadbalancer.support;

import java.util.Collections;
import java.util.concurrent.atomic.AtomicInteger;

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClient;
import org.springframework.cloud.loadbalancer.config.LoadBalancerAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import static org.assertj.core.api.Assertions.assertThat;

/**
 * @author Andrii Bohutskyi
 */
@SpringBootTest(
		classes = { LoadBalancerAutoConfiguration.class, LoadBalancerEagerContextInitializerTest.SomeTestConfig.class })
class LoadBalancerEagerContextInitializerTest {

	private static final String LOAD_BALANCER = "testLoadBalancer";

	@Autowired
	private LoadBalancerClientFactory factory;

	@Test
	void testLoadBalancerInstanceShouldBeInitialized() {
		assertThat(LoadBalancerCounter.getCount()).isEqualTo(1);
		factory.getInstance(LOAD_BALANCER);
		assertThat(LoadBalancerCounter.getCount()).isEqualTo(1);
	}

	@Configuration(proxyBeanMethods = false)
	@LoadBalancerClient(name = LOAD_BALANCER, configuration = TestLoadBalancerConfiguration.class)
	static class SomeTestConfig {

		@Bean
		public LoadBalancerEagerContextInitializer testLoadBalancerEagerContextInitializer(
				LoadBalancerClientFactory factory) {
			return new LoadBalancerEagerContextInitializer(factory, Collections.singletonList(LOAD_BALANCER));
		}

	}

	static class TestLoadBalancerConfiguration {

		@Bean
		public LoadBalancerCounter loadBalancerCounter() {
			return new LoadBalancerCounter();
		}

	}

	static class LoadBalancerCounter {

		private static final AtomicInteger COUNT = new AtomicInteger();

		LoadBalancerCounter() {
			COUNT.incrementAndGet();
		}

		public static int getCount() {
			return COUNT.get();
		}

	}

}