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Implement semaphore synchronization to prevent concurrent modificatio…issue#4094 #4301

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Implement semaphore synchronization to prevent concurrent modificatio…issue#4094 #4301

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145 changes: 97 additions & 48 deletions ...ain/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClientConfiguration.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,6 @@
import com.netflix.appinfo.HealthCheckHandler;
import com.netflix.discovery.EurekaClient;
import com.netflix.discovery.EurekaClientConfig;
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Please update the date in the license comment to 2013-2024.


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.health.SimpleStatusAggregator;
import org.springframework.boot.actuate.health.StatusAggregator;
Expand All @@ -35,6 +34,8 @@
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.concurrent.Semaphore;

/**
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Please add your full name with @author tag to the javadoc of the class.

* @author Dave Syer
* @author Spencer Gibb
Expand All @@ -51,52 +52,100 @@
@ConditionalOnBlockingDiscoveryEnabled
public class EurekaDiscoveryClientConfiguration {

@Bean
@ConditionalOnMissingBean
public EurekaDiscoveryClient discoveryClient(EurekaClient client, EurekaClientConfig clientConfig) {
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It seems you've changed formatting - as a result it shows as if you've modified all these lines of code. Please revert to our formatting (possibly a spaces/ tabs issue) so that it's clearly visible in the diff what code has been changed by you.

return new EurekaDiscoveryClient(client, clientConfig);
}

@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(value = "eureka.client.healthcheck.enabled", matchIfMissing = false)
protected static class EurekaHealthCheckHandlerConfiguration {

@Autowired(required = false)
private StatusAggregator statusAggregator = new SimpleStatusAggregator();

@Bean
@ConditionalOnMissingBean(HealthCheckHandler.class)
public EurekaHealthCheckHandler eurekaHealthCheckHandler() {
return new EurekaHealthCheckHandler(this.statusAggregator);
}

}

@Configuration(proxyBeanMethods = false)
@ConditionalOnClass(RefreshScopeRefreshedEvent.class)
protected static class EurekaClientConfigurationRefresher
implements ApplicationListener<RefreshScopeRefreshedEvent> {

@Autowired(required = false)
private EurekaClient eurekaClient;

@Autowired(required = false)
private EurekaAutoServiceRegistration autoRegistration;

public void onApplicationEvent(RefreshScopeRefreshedEvent event) {
// This will force the creation of the EurekaClient bean if not already
// created
// to make sure the client will be re-registered after a refresh event
if (eurekaClient != null) {
eurekaClient.getApplications();
}
if (autoRegistration != null) {
// register in case meta data changed
this.autoRegistration.stop();
this.autoRegistration.start();
}
}

}
@Bean
@ConditionalOnMissingBean
public EurekaDiscoveryClient discoveryClient(EurekaClient client, EurekaClientConfig clientConfig) {
return new EurekaDiscoveryClient(client, clientConfig);
}

@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(value = "eureka.client.healthcheck.enabled", matchIfMissing = false)
protected static class EurekaHealthCheckHandlerConfiguration {

@Autowired(required = false)
private StatusAggregator statusAggregator = new SimpleStatusAggregator();

@Bean
@ConditionalOnMissingBean(HealthCheckHandler.class)
public EurekaHealthCheckHandler eurekaHealthCheckHandler() {
return new EurekaHealthCheckHandler(this.statusAggregator);
}

}

@Configuration(proxyBeanMethods = false)
@ConditionalOnClass(RefreshScopeRefreshedEvent.class)
protected static class EurekaClientConfigurationRefresher
implements ApplicationListener<RefreshScopeRefreshedEvent> {

private final Semaphore semaphore = new Semaphore(1);

@Autowired(required = false)
private EurekaClient eurekaClient;

@Autowired(required = false)
private EurekaAutoServiceRegistration autoRegistration;

public void onApplicationEvent(RefreshScopeRefreshedEvent event) {
try {
semaphore.acquire();
if (eurekaClient != null) {
eurekaClient.getApplications();
}
if (autoRegistration != null) {
// deregister instance
this.autoRegistration.stop();
// register instance
this.autoRegistration.start();
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} finally {
semaphore.release();
}
}

}

@Configuration(proxyBeanMethods = false)
protected static class DiscoveryClientConfiguration {

private final Semaphore semaphore = new Semaphore(1);

@Autowired
private ApplicationInfoManager applicationInfoManager;

@Autowired
private HealthCheckHandler healthCheckHandler;

@Autowired
private InstanceInfo instanceInfo;

void refreshInstanceInfo() {
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It seems this method is not ever used - please verify and finish up your changes, and then request another review.

try {
semaphore.acquire();
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Why use binary semaphore rather than a ReentrantLock?

applicationInfoManager.refreshDataCenterInfoIfRequired();
applicationInfoManager.refreshLeaseInfoIfRequired();

InstanceStatus status;
try {
// get instance status
status = healthCheckHandler.getStatus(instanceInfo.getStatus());
} catch (Exception e) {
logger.warn("Exception from healthcheckHandler.getStatus, setting status to DOWN", e);
status = InstanceStatus.DOWN;
}

if (null != status) {
// modify instance status
applicationInfoManager.setInstanceStatus(status);
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} finally {
semaphore.release();
}
}
}

}
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