| /* |
| * 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.cassandra.locator; |
| |
| import java.util.function.Predicate; |
| |
| import static org.apache.cassandra.config.DatabaseDescriptor.getEndpointSnitch; |
| import static org.apache.cassandra.config.DatabaseDescriptor.getLocalDataCenter; |
| |
| public class InOurDc |
| { |
| private static ReplicaTester replicas; |
| private static EndpointTester endpoints; |
| |
| final String dc; |
| final IEndpointSnitch snitch; |
| |
| private InOurDc(String dc, IEndpointSnitch snitch) |
| { |
| this.dc = dc; |
| this.snitch = snitch; |
| } |
| |
| boolean stale() |
| { |
| return dc != getLocalDataCenter() |
| || snitch != getEndpointSnitch() |
| // this final clause checks if somehow the snitch/localDc have got out of whack; |
| // presently, this is possible but very unlikely, but this check will also help |
| // resolve races on these global fields as well |
| || !dc.equals(snitch.getLocalDatacenter()); |
| } |
| |
| private static final class ReplicaTester extends InOurDc implements Predicate<Replica> |
| { |
| private ReplicaTester(String dc, IEndpointSnitch snitch) |
| { |
| super(dc, snitch); |
| } |
| |
| @Override |
| public boolean test(Replica replica) |
| { |
| return dc.equals(snitch.getDatacenter(replica.endpoint())); |
| } |
| } |
| |
| private static final class EndpointTester extends InOurDc implements Predicate<InetAddressAndPort> |
| { |
| private EndpointTester(String dc, IEndpointSnitch snitch) |
| { |
| super(dc, snitch); |
| } |
| |
| @Override |
| public boolean test(InetAddressAndPort endpoint) |
| { |
| return dc.equals(snitch.getDatacenter(endpoint)); |
| } |
| } |
| |
| public static Predicate<Replica> replicas() |
| { |
| ReplicaTester cur = replicas; |
| if (cur == null || cur.stale()) |
| replicas = cur = new ReplicaTester(getLocalDataCenter(), getEndpointSnitch()); |
| return cur; |
| } |
| |
| public static Predicate<InetAddressAndPort> endpoints() |
| { |
| EndpointTester cur = endpoints; |
| if (cur == null || cur.stale()) |
| endpoints = cur = new EndpointTester(getLocalDataCenter(), getEndpointSnitch()); |
| return cur; |
| } |
| |
| public static boolean isInOurDc(Replica replica) |
| { |
| return replicas().test(replica); |
| } |
| |
| public static boolean isInOurDc(InetAddressAndPort endpoint) |
| { |
| return endpoints().test(endpoint); |
| } |
| |
| } |