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ConfigServerInstanceProvider.java
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ConfigServerInstanceProvider.java
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/*
* Copyright 2018-2019 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.config.client;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.retry.annotation.Retryable;
/**
* Fetches config server instances.
*
* @author Nastya Smirnova
*/
public class ConfigServerInstanceProvider {
private static Log logger = LogFactory.getLog(ConfigServerInstanceProvider.class);
private final Function function;
public ConfigServerInstanceProvider(DiscoveryClient client) {
this.function = client::getInstances;
}
public ConfigServerInstanceProvider(Function function) {
this.function = function;
}
@Retryable(interceptor = "configServerRetryInterceptor")
public List<ServiceInstance> getConfigServerInstances(String serviceId) {
logger.debug("Locating configserver (" + serviceId + ") via discovery");
List<ServiceInstance> instances = this.function.apply(serviceId);
if (instances.isEmpty()) {
throw new IllegalStateException(
"No instances found of configserver (" + serviceId + ")");
}
logger.debug("Located configserver (" + serviceId
+ ") via discovery. No of instances found: " + instances.size());
return instances;
}
@FunctionalInterface
public interface Function {
List<ServiceInstance> apply(String serviceId);
}
}