| /** |
| * 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 com.twitter.distributedlog.client.routing; |
| |
| import com.twitter.common.zookeeper.ServerSet; |
| |
| import java.net.SocketAddress; |
| |
| /** |
| * Utils for routing services |
| */ |
| public class RoutingUtils { |
| |
| private static final int NUM_CONSISTENT_HASH_REPLICAS = 997; |
| |
| /** |
| * Building routing service from <code>finagleNameStr</code> |
| * |
| * @param finagleNameStr |
| * finagle name str of a service |
| * @return routing service builder |
| */ |
| public static RoutingService.Builder buildRoutingService(String finagleNameStr) { |
| if (!finagleNameStr.startsWith("serverset!") && !finagleNameStr.startsWith("inet!")) { |
| // We only support serverset based names at the moment |
| throw new UnsupportedOperationException("Finagle Name format not supported for name: " + finagleNameStr); |
| } |
| return buildRoutingService(new NameServerSet(finagleNameStr), true); |
| } |
| |
| /** |
| * Building routing service from <code>serverSet</code>. |
| * |
| * @param serverSet |
| * server set of a service |
| * @return routing service builder |
| */ |
| public static RoutingService.Builder buildRoutingService(ServerSet serverSet) { |
| return buildRoutingService(serverSet, false); |
| } |
| |
| /** |
| * Building routing service from <code>address</code>. |
| * |
| * @param address |
| * host to route the requests |
| * @return routing service builder |
| */ |
| public static RoutingService.Builder buildRoutingService(SocketAddress address) { |
| return SingleHostRoutingService.newBuilder().address(address); |
| } |
| |
| /** |
| * Build routing service builder of a routing service <code>routingService</code>. |
| * |
| * @param routingService |
| * routing service to provide |
| * @return routing service builder |
| */ |
| public static RoutingService.Builder buildRoutingService(RoutingService routingService) { |
| return new RoutingServiceProvider(routingService); |
| } |
| |
| private static RoutingService.Builder buildRoutingService(ServerSet serverSet, |
| boolean resolveFromName) { |
| return ConsistentHashRoutingService.newBuilder() |
| .serverSet(serverSet) |
| .resolveFromName(resolveFromName) |
| .numReplicas(NUM_CONSISTENT_HASH_REPLICAS); |
| } |
| |
| } |