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feat:call choose method when eagerly initializing the load-balancers. #1531

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feat:call choose method when eagerly initializing the load-balancers. #1531

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26 changes: 22 additions & 4 deletions ...a/org/springframework/cloud/loadbalancer/support/LoadBalancerEagerContextInitializer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,16 +16,24 @@

package org.springframework.cloud.loadbalancer.support;

import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.Response;
import org.springframework.cloud.client.loadbalancer.reactive.ReactiveLoadBalancer;
import org.springframework.context.ApplicationListener;
import reactor.core.publisher.Mono;

import java.util.List;

/**
* @author Andrii Bohutskyi
* @author Andrii Bohutskyi, Haotian Zhang
*/
public class LoadBalancerEagerContextInitializer implements ApplicationListener<ApplicationReadyEvent> {

private static final Log log = LogFactory.getLog(LoadBalancerEagerContextInitializer.class);

private final LoadBalancerClientFactory factory;

private final List<String> serviceNames;
Expand All @@ -37,7 +45,17 @@ public LoadBalancerEagerContextInitializer(LoadBalancerClientFactory factory, Li

@Override
public void onApplicationEvent(ApplicationReadyEvent applicationReadyEvent) {
serviceNames.forEach(factory::getInstance);
serviceNames.forEach(serviceName -> {
ReactiveLoadBalancer<ServiceInstance> loadBalancer = factory.getInstance(serviceName);
if (loadBalancer != null) {
Response<ServiceInstance> loadBalancerResponse = Mono.from(loadBalancer.choose()).block();
if (log.isDebugEnabled() && loadBalancerResponse != null) {
log.debug("LoadBalancer for service: " + serviceName + " initialized with chosen instance: "
+ loadBalancerResponse.getServer().getHost() + ":" + loadBalancerResponse.getServer().getPort());
}
log.info("LoadBalancer for service: " + serviceName + " initialized");
}
});
}

}