| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.servicecomb.loadbalance.filterext; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.servicecomb.core.Invocation; |
| import org.apache.servicecomb.loadbalance.ServerListFilterExt; |
| import org.apache.servicecomb.loadbalance.ServiceCombServer; |
| import org.apache.servicecomb.serviceregistry.RegistryUtils; |
| import org.apache.servicecomb.serviceregistry.api.registry.MicroserviceInstance; |
| |
| import com.netflix.config.DynamicPropertyFactory; |
| |
| public class ZoneAwareDiscoveryFilter implements ServerListFilterExt { |
| |
| @Override |
| public int getOrder() { |
| return ORDER_ZONE_AWARE; |
| } |
| |
| @Override |
| public boolean enabled() { |
| return DynamicPropertyFactory.getInstance() |
| .getBooleanProperty(ZONE_AWARE_FILTER_ENABLED, true) |
| .get(); |
| } |
| |
| @Override |
| public List<ServiceCombServer> getFilteredListOfServers(List<ServiceCombServer> servers, |
| Invocation invocation) { |
| MicroserviceInstance myself = RegistryUtils.getMicroserviceInstance(); |
| |
| List<ServiceCombServer> instancesRegionAndAZMatch = new ArrayList<>(); |
| List<ServiceCombServer> instancesAZMatch = new ArrayList<>(); |
| List<ServiceCombServer> instancesNoMatch = new ArrayList<>(); |
| servers.forEach((server) -> { |
| if (regionAndAZMatch(myself, server.getInstance())) { |
| instancesRegionAndAZMatch.add(server); |
| } else if (regionMatch(myself, server.getInstance())) { |
| instancesAZMatch.add(server); |
| } else { |
| instancesNoMatch.add(server); |
| } |
| }); |
| if (!instancesRegionAndAZMatch.isEmpty()) { |
| return instancesRegionAndAZMatch; |
| } else if (!instancesAZMatch.isEmpty()) { |
| return instancesAZMatch; |
| } |
| return instancesNoMatch; |
| } |
| |
| private boolean regionAndAZMatch(MicroserviceInstance myself, MicroserviceInstance target) { |
| if (myself == null || myself.getDataCenterInfo() == null) { |
| // when instance have no datacenter info, it will match all other datacenters |
| return true; |
| } |
| if (target.getDataCenterInfo() != null) { |
| return myself.getDataCenterInfo().getRegion().equals(target.getDataCenterInfo().getRegion()) && |
| myself.getDataCenterInfo().getAvailableZone().equals(target.getDataCenterInfo().getAvailableZone()); |
| } |
| return false; |
| } |
| |
| private boolean regionMatch(MicroserviceInstance myself, MicroserviceInstance target) { |
| if (target.getDataCenterInfo() != null) { |
| return myself.getDataCenterInfo().getRegion().equals(target.getDataCenterInfo().getRegion()); |
| } |
| return false; |
| } |
| } |