/*
* Copyright 2013 Netflix, Inc.
*
* 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 com.netflix.suro.connection;
import com.google.inject.Inject;
import com.netflix.client.config.CommonClientConfigKey;
import com.netflix.client.config.DefaultClientConfigImpl;
import com.netflix.client.config.IClientConfig;
import com.netflix.governator.guice.lazy.LazySingleton;
import com.netflix.loadbalancer.DynamicServerListLoadBalancer;
import com.netflix.loadbalancer.Server;
import com.netflix.niws.loadbalancer.DiscoveryEnabledNIWSServerList;
import com.netflix.suro.ClientConfig;
import javax.annotation.PreDestroy;
import java.util.List;
/**
* A load balancer that depends on <a href="https://github.com/Netflix/eureka">Netflix Eureka</a> to find
* all the registered server instances.
*
* @author jbae
*/
@LazySingleton
public class EurekaLoadBalancer extends DynamicServerListLoadBalancer {
private final int port;
/**
* @param config contains vipAddress
*/
@Inject
public EurekaLoadBalancer(ClientConfig config) {
String[] vipAddress_port = config.getLoadBalancerServer().split(":");
if (vipAddress_port.length != 2) {
throw new IllegalArgumentException(String.format(
"EurekaLoadBalancer server should be formatted vipAddress:port ('%s')",
config.getLoadBalancerServer()));
}
this.port = Integer.parseInt(vipAddress_port[1]);
IClientConfig loadBalancerConfig = new DefaultClientConfigImpl();
loadBalancerConfig.loadProperties("suroClient");
loadBalancerConfig.setProperty(CommonClientConfigKey.DeploymentContextBasedVipAddresses, vipAddress_port[0]);
loadBalancerConfig.setProperty(CommonClientConfigKey.NIWSServerListClassName, DiscoveryEnabledNIWSServerList.class.getName());
super.initWithNiwsConfig(loadBalancerConfig);
}
/**
* This function is called from ConnectionPool to retrieve which server to
* communicate
*
* @param key can bel null
* @return
*/
@Override
public Server chooseServer(Object key) {
Server server = super.chooseServer(key);
if (server == null) {
return null;
}
server.setPort(port);
return server;
}
@Override
public List<Server> getServerList(boolean availableOnly) {
List<Server> serverList = super.getServerList(availableOnly);
for (Server s : serverList) {
s.setPort(port);
}
return serverList;
}
@PreDestroy
public void clear() {
cancelPingTask();
}
}