/*
* 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.DefaultClientConfigImpl;
import com.netflix.client.config.CommonClientConfigKey;
import com.netflix.client.config.IClientConfig;
import com.netflix.governator.guice.lazy.LazySingleton;
import com.netflix.loadbalancer.BaseLoadBalancer;
import com.netflix.loadbalancer.Server;
import com.netflix.suro.ClientConfig;
import javax.annotation.PreDestroy;
import java.util.ArrayList;
import java.util.List;
/**
* A load balancer that works on a static list of servers as defined in client configuration.
*
* @author jbae
*/
@LazySingleton
public class StaticLoadBalancer extends BaseLoadBalancer {
/**
* @param config contains the server list, comma separated with the format
* hostname:port
*/
@Inject
public StaticLoadBalancer(ClientConfig config) {
List<Server> serverList = new ArrayList<Server>();
for (String s : config.getLoadBalancerServer().split(",")) {
String[] host_port = s.split(":");
serverList.add(new Server(host_port[0], Integer.parseInt(host_port[1])));
}
if (serverList.isEmpty()) {
throw new IllegalArgumentException("empty server list");
}
IClientConfig loadBalancerConfig = new DefaultClientConfigImpl();
loadBalancerConfig.loadProperties("suroClient");
loadBalancerConfig.setProperty(CommonClientConfigKey.NFLoadBalancerPingClassName, "com.netflix.suro.connection.SuroPing");
super.initWithNiwsConfig(loadBalancerConfig);
addServers(serverList);
}
@PreDestroy
public void clear() {
cancelPingTask();
setServersList(new ArrayList<Server>());
}
}