io.grpc.PickFirstBalancerFactory Maven / Gradle / Ivy
/*
* Copyright 2015 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;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* A {@link LoadBalancer} that provides no load balancing mechanism over the
* addresses from the {@link NameResolver}. The channel's default behavior
* (currently pick-first) is used for all addresses found.
*
* @deprecated this is the default balancer and should not be referenced to. This will be deleted
* soon.
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1771")
@Deprecated
public final class PickFirstBalancerFactory extends LoadBalancer.Factory {
private static PickFirstBalancerFactory instance;
private final LoadBalancerProvider provider;
private PickFirstBalancerFactory() {
provider = checkNotNull(
LoadBalancerRegistry.getDefaultRegistry().getProvider("pick_first"),
"pick_first balancer not available");
}
/**
* Gets an instance of this factory.
*/
public static synchronized PickFirstBalancerFactory getInstance() {
if (instance == null) {
instance = new PickFirstBalancerFactory();
}
return instance;
}
@Override
public LoadBalancer newLoadBalancer(LoadBalancer.Helper helper) {
return provider.newLoadBalancer(helper);
}
}