/*
* 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.server;
import java.util.List;
import com.netflix.eureka.lease.Lease;
import org.springframework.beans.BeansException;
import org.springframework.cloud.netflix.eureka.server.event.EurekaInstanceCanceledEvent;
import org.springframework.cloud.netflix.eureka.server.event.EurekaInstanceRegisteredEvent;
import org.springframework.cloud.netflix.eureka.server.event.EurekaInstanceRenewedEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import com.netflix.appinfo.ApplicationInfoManager;
import com.netflix.appinfo.InstanceInfo;
import com.netflix.discovery.EurekaClient;
import com.netflix.discovery.EurekaClientConfig;
import com.netflix.discovery.shared.Application;
import com.netflix.eureka.EurekaServerConfig;
import com.netflix.eureka.registry.PeerAwareInstanceRegistryImpl;
import com.netflix.eureka.resources.ServerCodecs;
import lombok.extern.apachecommons.CommonsLog;
import org.springframework.context.ApplicationEvent;
/**
* @author Spencer Gibb
*/
@CommonsLog
public class InstanceRegistry extends PeerAwareInstanceRegistryImpl
implements ApplicationContextAware {
private ApplicationContext ctxt;
private int defaultOpenForTrafficCount;
public InstanceRegistry(EurekaServerConfig serverConfig,
EurekaClientConfig clientConfig, ServerCodecs serverCodecs,
EurekaClient eurekaClient, int expectedNumberOfRenewsPerMin,
int defaultOpenForTrafficCount) {
super(serverConfig, clientConfig, serverCodecs, eurekaClient);
this.expectedNumberOfRenewsPerMin = expectedNumberOfRenewsPerMin;
this.defaultOpenForTrafficCount = defaultOpenForTrafficCount;
}
@Override
public void setApplicationContext(ApplicationContext context) throws BeansException {
this.ctxt = context;
}
/**
* If
* {@link PeerAwareInstanceRegistryImpl#openForTraffic(ApplicationInfoManager, int)}
* is called with a zero argument, it means that leases are not automatically
* cancelled if the instance hasn't sent any renewals recently. This happens for a
* standalone server. It seems like a bad default, so we set it to the smallest
* non-zero value we can, so that any instances that subsequently register can bump up
* the threshold.
*/
@Override
public void openForTraffic(ApplicationInfoManager applicationInfoManager, int count) {
super.openForTraffic(applicationInfoManager,
count == 0 ? this.defaultOpenForTrafficCount : count);
}
@Override
public void register(InstanceInfo info, int leaseDuration, boolean isReplication) {
handleRegistration(info, leaseDuration, isReplication);
super.register(info, leaseDuration, isReplication);
}
@Override
public void register(final InstanceInfo info, final boolean isReplication) {
handleRegistration(info, resolveInstanceLeaseDuration(info), isReplication);
super.register(info, isReplication);
}
@Override
public boolean cancel(String appName, String serverId, boolean isReplication) {
handleCancelation(appName, serverId, isReplication);
return super.cancel(appName, serverId, isReplication);
}
@Override
public boolean renew(final String appName, final String serverId,
boolean isReplication) {
log("renew " + appName + " serverId " + serverId + ", isReplication {}"
+ isReplication);
List<Application> applications = getSortedApplications();
for (Application input : applications) {
if (input.getName().equals(appName)) {
InstanceInfo instance = null;
for (InstanceInfo info : input.getInstances()) {
if (info.getId().equals(serverId)) {
instance = info;
break;
}
}
publishEvent(new EurekaInstanceRenewedEvent(this, appName, serverId,
instance, isReplication));
break;
}
}
return super.renew(appName, serverId, isReplication);
}
@Override
protected boolean internalCancel(String appName, String id, boolean isReplication) {
handleCancelation(appName, id, isReplication);
return super.internalCancel(appName, id, isReplication);
}
private void handleCancelation(String appName, String id, boolean isReplication) {
log("cancel " + appName + ", serverId " + id + ", isReplication " + isReplication);
publishEvent(new EurekaInstanceCanceledEvent(this, appName, id, isReplication));
}
private void handleRegistration(InstanceInfo info, int leaseDuration,
boolean isReplication) {
log("register " + info.getAppName() + ", vip " + info.getVIPAddress()
+ ", leaseDuration " + leaseDuration + ", isReplication "
+ isReplication);
publishEvent(new EurekaInstanceRegisteredEvent(this, info, leaseDuration,
isReplication));
}
private void log(String message) {
if (log.isDebugEnabled()) {
log.debug(message);
}
}
private void publishEvent(ApplicationEvent applicationEvent) {
this.ctxt.publishEvent(applicationEvent);
}
private int resolveInstanceLeaseDuration(final InstanceInfo info) {
int leaseDuration = Lease.DEFAULT_DURATION_IN_SECS;
if (info.getLeaseInfo() != null && info.getLeaseInfo().getDurationInSecs() > 0) {
leaseDuration = info.getLeaseInfo().getDurationInSecs();
}
return leaseDuration;
}
}