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WrrLocalityLoadBalancerProvider.java
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WrrLocalityLoadBalancerProvider.java
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/*
* Copyright 2022 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.xds;
import io.grpc.Internal;
import io.grpc.LoadBalancer;
import io.grpc.LoadBalancer.Helper;
import io.grpc.LoadBalancerProvider;
import io.grpc.LoadBalancerRegistry;
import io.grpc.NameResolver.ConfigOrError;
import io.grpc.Status;
import io.grpc.internal.JsonUtil;
import io.grpc.internal.ServiceConfigUtil;
import io.grpc.internal.ServiceConfigUtil.LbConfig;
import io.grpc.internal.ServiceConfigUtil.PolicySelection;
import io.grpc.xds.WrrLocalityLoadBalancer.WrrLocalityConfig;
import java.util.List;
import java.util.Map;
/**
* The provider for {@link WrrLocalityLoadBalancer}. An instance of this class should be acquired
* through {@link LoadBalancerRegistry#getProvider} by using the name
* "xds_wrr_locality_experimental".
*/
@Internal
public final class WrrLocalityLoadBalancerProvider extends LoadBalancerProvider {
@Override
public LoadBalancer newLoadBalancer(Helper helper) {
return new WrrLocalityLoadBalancer(helper);
}
@Override
public boolean isAvailable() {
return true;
}
@Override
public int getPriority() {
return 5;
}
@Override
public String getPolicyName() {
return XdsLbPolicies.WRR_LOCALITY_POLICY_NAME;
}
@Override
public ConfigOrError parseLoadBalancingPolicyConfig(Map<String, ?> rawConfig) {
try {
List<LbConfig> childConfigCandidates = ServiceConfigUtil.unwrapLoadBalancingConfigList(
JsonUtil.getListOfObjects(rawConfig, "childPolicy"));
if (childConfigCandidates == null || childConfigCandidates.isEmpty()) {
return ConfigOrError.fromError(Status.INTERNAL.withDescription(
"No child policy in wrr_locality LB policy: "
+ rawConfig));
}
ConfigOrError selectedConfig =
ServiceConfigUtil.selectLbPolicyFromList(childConfigCandidates,
LoadBalancerRegistry.getDefaultRegistry());
if (selectedConfig.getError() != null) {
return selectedConfig;
}
PolicySelection policySelection = (PolicySelection) selectedConfig.getConfig();
return ConfigOrError.fromConfig(new WrrLocalityConfig(policySelection));
} catch (RuntimeException e) {
return ConfigOrError.fromError(Status.fromThrowable(e)
.withDescription("Failed to parse wrr_locality LB config: " + rawConfig));
}
}
}