/*
* Copyright 2013-2015 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
*
* 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 org.springframework.cloud.netflix.eureka;
import java.lang.reflect.Field;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.cloud.client.discovery.event.HeartbeatEvent;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.util.ReflectionUtils;
import com.netflix.appinfo.ApplicationInfoManager;
import com.netflix.appinfo.InstanceInfo;
import com.netflix.appinfo.InstanceInfo.InstanceStatus;
import com.netflix.discovery.DiscoveryClient;
import com.netflix.discovery.EurekaClientConfig;
import com.netflix.discovery.shared.transport.EurekaHttpClient;
/**
* Subclass of {@link DiscoveryClient} that sends a {@link HeartbeatEvent} when
* {@link CloudEurekaClient#onCacheRefreshed()} is called.
* @author Spencer Gibb
*/
public class CloudEurekaClient extends DiscoveryClient {
private static final Log log = LogFactory.getLog(CloudEurekaClient.class);
private final AtomicLong cacheRefreshedCount = new AtomicLong(0);
private ApplicationEventPublisher publisher;
private Field eurekaTransportField;
private ApplicationInfoManager applicationInfoManager;
private AtomicReference<EurekaHttpClient> eurekaHttpClient = new AtomicReference<>();
public CloudEurekaClient(ApplicationInfoManager applicationInfoManager,
EurekaClientConfig config, ApplicationEventPublisher publisher) {
this(applicationInfoManager, config, null, publisher);
}
public CloudEurekaClient(ApplicationInfoManager applicationInfoManager,
EurekaClientConfig config,
DiscoveryClientOptionalArgs args,
ApplicationEventPublisher publisher) {
super(applicationInfoManager, config, args);
this.applicationInfoManager = applicationInfoManager;
this.publisher = publisher;
this.eurekaTransportField = ReflectionUtils.findField(DiscoveryClient.class, "eurekaTransport");
ReflectionUtils.makeAccessible(this.eurekaTransportField);
}
public ApplicationInfoManager getApplicationInfoManager() {
return applicationInfoManager;
}
public void cancelOverrideStatus(InstanceInfo info) {
getEurekaHttpClient().deleteStatusOverride(info.getAppName(), info.getId(), info);
}
EurekaHttpClient getEurekaHttpClient() {
if (this.eurekaHttpClient.get() == null) {
try {
Object eurekaTransport = this.eurekaTransportField.get(this);
Field registrationClientField = ReflectionUtils.findField(eurekaTransport.getClass(), "registrationClient");
ReflectionUtils.makeAccessible(registrationClientField);
this.eurekaHttpClient.compareAndSet(null, (EurekaHttpClient) registrationClientField.get(eurekaTransport));
} catch (IllegalAccessException e) {
log.error("error getting EurekaHttpClient", e);
}
}
return this.eurekaHttpClient.get();
}
public void setStatus(InstanceStatus newStatus, InstanceInfo info) {
getEurekaHttpClient().statusUpdate(info.getAppName(), info.getId(), newStatus, info);
}
@Override
protected void onCacheRefreshed() {
if (this.cacheRefreshedCount != null) { //might be called during construction and will be null
long newCount = this.cacheRefreshedCount.incrementAndGet();
log.trace("onCacheRefreshed called with count: " + newCount);
this.publisher.publishEvent(new HeartbeatEvent(this, newCount));
}
}
}