| /* |
| * 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.pulsar.client.impl; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| import java.net.InetSocketAddress; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicIntegerFieldUpdater; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.pulsar.client.api.PulsarClientException.InvalidServiceURL; |
| import org.apache.pulsar.common.net.ServiceURI; |
| |
| /** |
| * The default implementation of {@link ServiceNameResolver}. |
| */ |
| @Slf4j |
| public class PulsarServiceNameResolver implements ServiceNameResolver { |
| |
| private volatile ServiceURI serviceUri; |
| private volatile String serviceUrl; |
| private static final AtomicIntegerFieldUpdater<PulsarServiceNameResolver> CURRENT_INDEX_UPDATER = |
| AtomicIntegerFieldUpdater.newUpdater(PulsarServiceNameResolver.class, "currentIndex"); |
| private volatile int currentIndex; |
| private volatile List<InetSocketAddress> addressList; |
| |
| @Override |
| public InetSocketAddress resolveHost() { |
| List<InetSocketAddress> list = addressList; |
| checkState( |
| list != null, "No service url is provided yet"); |
| checkState( |
| !list.isEmpty(), "No hosts found for service url : " + serviceUrl); |
| if (list.size() == 1) { |
| return list.get(0); |
| } else { |
| int originalIndex = CURRENT_INDEX_UPDATER.getAndUpdate(this, last -> (last + 1) % list.size()); |
| return list.get((originalIndex + 1) % list.size()); |
| } |
| } |
| |
| @Override |
| public URI resolveHostUri() { |
| InetSocketAddress host = resolveHost(); |
| String hostUrl = serviceUri.getServiceScheme() + "://" + host.getHostString() + ":" + host.getPort(); |
| return URI.create(hostUrl); |
| } |
| |
| @Override |
| public String getServiceUrl() { |
| return serviceUrl; |
| } |
| |
| @Override |
| public ServiceURI getServiceUri() { |
| return serviceUri; |
| } |
| |
| @Override |
| public void updateServiceUrl(String serviceUrl) throws InvalidServiceURL { |
| ServiceURI uri; |
| try { |
| uri = ServiceURI.create(serviceUrl); |
| } catch (IllegalArgumentException iae) { |
| log.error("Invalid service-url {} provided {}", serviceUrl, iae.getMessage(), iae); |
| throw new InvalidServiceURL(iae); |
| } |
| |
| String[] hosts = uri.getServiceHosts(); |
| List<InetSocketAddress> addresses = new ArrayList<>(hosts.length); |
| for (String host : hosts) { |
| String hostUrl = uri.getServiceScheme() + "://" + host; |
| try { |
| URI hostUri = new URI(hostUrl); |
| addresses.add(InetSocketAddress.createUnresolved(hostUri.getHost(), hostUri.getPort())); |
| } catch (URISyntaxException e) { |
| log.error("Invalid host provided {}", hostUrl, e); |
| throw new InvalidServiceURL(e); |
| } |
| } |
| this.addressList = addresses; |
| this.serviceUrl = serviceUrl; |
| this.serviceUri = uri; |
| this.currentIndex = randomIndex(addresses.size()); |
| } |
| |
| private static int randomIndex(int numAddresses) { |
| return numAddresses == 1 |
| ? |
| 0 : io.netty.util.internal.PlatformDependent.threadLocalRandom().nextInt(numAddresses); |
| } |
| } |