io.grpc.util.RoundRobinLoadBalancerFactory Maven / Gradle / Ivy
/*
* Copyright 2016 The gRPC 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 io.grpc.util;
import static com.google.common.base.Preconditions.checkNotNull;
import io.grpc.ExperimentalApi;
import io.grpc.LoadBalancer;
import io.grpc.LoadBalancerProvider;
import io.grpc.LoadBalancerRegistry;
/**
* A {@link LoadBalancer} that provides round-robin load balancing mechanism over the
* addresses.
*
* @deprecated use {@link io.grpc.LoadBalancerRegistry#getProvider} with "round_robin" policy. This
* class will be deleted soon.
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1771")
@Deprecated
public final class RoundRobinLoadBalancerFactory extends LoadBalancer.Factory {
private static RoundRobinLoadBalancerFactory instance;
private final LoadBalancerProvider provider;
private RoundRobinLoadBalancerFactory() {
provider = checkNotNull(
LoadBalancerRegistry.getDefaultRegistry().getProvider("round_robin"),
"round_robin balancer not available");
}
/**
* Gets the singleton instance of this factory.
*/
public static synchronized RoundRobinLoadBalancerFactory getInstance() {
if (instance == null) {
instance = new RoundRobinLoadBalancerFactory();
}
return instance;
}
@Override
public LoadBalancer newLoadBalancer(LoadBalancer.Helper helper) {
return provider.newLoadBalancer(helper);
}
}