| /** |
| * 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.zookeeper.server.quorum; |
| |
| import static java.util.Arrays.asList; |
| import java.io.IOException; |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.NoRouteToHostException; |
| import java.net.UnknownHostException; |
| import java.time.Duration; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.NoSuchElementException; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.stream.Collectors; |
| |
| /** |
| * This class allows to store several quorum and electing addresses. |
| * |
| * See ZOOKEEPER-3188 for a discussion of this feature. |
| */ |
| public final class MultipleAddresses { |
| private static final Duration DEFAULT_TIMEOUT = Duration.ofMillis(500); |
| |
| private static Set<InetSocketAddress> newConcurrentHashSet() { |
| return Collections.newSetFromMap(new ConcurrentHashMap<>()); |
| } |
| |
| private Set<InetSocketAddress> addresses; |
| private final Duration timeout; |
| |
| public MultipleAddresses() { |
| this(Collections.emptyList()); |
| } |
| |
| public MultipleAddresses(Collection<InetSocketAddress> addresses) { |
| this(addresses, DEFAULT_TIMEOUT); |
| } |
| |
| public MultipleAddresses(InetSocketAddress address) { |
| this(asList(address), DEFAULT_TIMEOUT); |
| } |
| |
| public MultipleAddresses(Collection<InetSocketAddress> addresses, Duration timeout) { |
| this.addresses = newConcurrentHashSet(); |
| this.addresses.addAll(addresses); |
| this.timeout = timeout; |
| } |
| |
| public boolean isEmpty() { |
| return addresses.isEmpty(); |
| } |
| |
| /** |
| * Returns all addresses in an unmodifiable set. |
| * |
| * @return set of all InetSocketAddress |
| */ |
| public Set<InetSocketAddress> getAllAddresses() { |
| return Collections.unmodifiableSet(addresses); |
| } |
| |
| /** |
| * Returns wildcard addresses for all ports |
| * |
| * @return set of InetSocketAddress with wildcards for all ports |
| */ |
| public Set<InetSocketAddress> getWildcardAddresses() { |
| return addresses.stream().map(a -> new InetSocketAddress(a.getPort())).collect(Collectors.toSet()); |
| } |
| |
| /** |
| * Returns all ports |
| * |
| * @return list of all ports |
| */ |
| public List<Integer> getAllPorts() { |
| return addresses.stream().map(InetSocketAddress::getPort).distinct().collect(Collectors.toList()); |
| } |
| |
| /** |
| * Returns distinct list of all host strings |
| * |
| * @return list of all hosts |
| */ |
| public List<String> getAllHostStrings() { |
| return addresses.stream().map(InetSocketAddress::getHostString).distinct().collect(Collectors.toList()); |
| } |
| |
| public void addAddress(InetSocketAddress address) { |
| addresses.add(address); |
| } |
| |
| /** |
| * Returns a reachable address. If none is reachable than throws exception. |
| * The function is nondeterministic in the sense that the result of calling this function |
| * twice with the same set of reachable addresses might lead to different results. |
| * |
| * @return address which is reachable. |
| * @throws NoRouteToHostException if none of the addresses are reachable |
| */ |
| public InetSocketAddress getReachableAddress() throws NoRouteToHostException { |
| // using parallelStream() + findAny() will help to minimize the time spent on network operations |
| return addresses.parallelStream() |
| .filter(this::checkIfAddressIsReachable) |
| .findAny() |
| .orElseThrow(() -> new NoRouteToHostException("No valid address among " + addresses)); |
| } |
| |
| /** |
| * Returns a set of all reachable addresses. If none is reachable than returns empty set. |
| * |
| * @return all addresses which are reachable. |
| */ |
| public Set<InetSocketAddress> getAllReachableAddresses() { |
| // using parallelStream() will help to minimize the time spent on network operations |
| return addresses.parallelStream() |
| .filter(this::checkIfAddressIsReachable) |
| .collect(Collectors.toSet()); |
| } |
| |
| /** |
| * Returns a reachable address or an arbitrary one, if none is reachable. It throws an exception |
| * if there are no addresses registered. The function is nondeterministic in the sense that the |
| * result of calling this function twice with the same set of reachable addresses might lead |
| * to different results. |
| * |
| * @return address which is reachable or fist one. |
| * @throws NoSuchElementException if there is no address registered |
| */ |
| public InetSocketAddress getReachableOrOne() { |
| InetSocketAddress address; |
| try { |
| address = getReachableAddress(); |
| } catch (NoRouteToHostException e) { |
| address = getOne(); |
| } |
| return address; |
| } |
| |
| /** |
| * Performs a parallel DNS lookup for all addresses. |
| * |
| * If the DNS lookup fails, then address remain unmodified. |
| */ |
| public void recreateSocketAddresses() { |
| addresses = addresses.parallelStream() |
| .map(this::recreateSocketAddress) |
| .collect(Collectors.toCollection(MultipleAddresses::newConcurrentHashSet)); |
| } |
| |
| /** |
| * Returns an address from the set. |
| * |
| * @return address from a set. |
| * @throws NoSuchElementException if there is no address registered |
| */ |
| public InetSocketAddress getOne() { |
| return addresses.iterator().next(); |
| } |
| |
| private boolean checkIfAddressIsReachable(InetSocketAddress address) { |
| if (address.isUnresolved()) { |
| return false; |
| } |
| try { |
| if (address.getAddress().isReachable((int) timeout.toMillis())) { |
| return true; |
| } |
| } catch (IOException ignored) { |
| // ignore, we don't really care if we can't reach it for timeout or for IO problems |
| } |
| return false; |
| } |
| |
| private InetSocketAddress recreateSocketAddress(InetSocketAddress address) { |
| try { |
| return new InetSocketAddress(InetAddress.getByName(address.getHostString()), address.getPort()); |
| } catch (UnknownHostException e) { |
| return address; |
| } |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } else if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| MultipleAddresses that = (MultipleAddresses) o; |
| return Objects.equals(addresses, that.addresses); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(addresses); |
| } |
| |
| @Override |
| public String toString() { |
| return addresses.stream().map(InetSocketAddress::toString).collect(Collectors.joining("|")); |
| } |
| } |