| /* |
| * 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.net.InetAddress; |
| |
| /** |
| * An endpoint snitch tells Cassandra information about network topology that it can use to route |
| * requests more efficiently. |
| */ |
| public abstract class AbstractNetworkTopologySnitch extends AbstractEndpointSnitch |
| { |
| /** |
| * Return the rack for which an endpoint resides in |
| * @param endpoint a specified endpoint |
| * @return string of rack |
| */ |
| abstract public String getRack(InetAddress endpoint); |
| |
| /** |
| * Return the data center for which an endpoint resides in |
| * @param endpoint a specified endpoint |
| * @return string of data center |
| */ |
| abstract public String getDatacenter(InetAddress endpoint); |
| |
| public int compareEndpoints(InetAddress address, InetAddress a1, InetAddress a2) |
| { |
| if (address.equals(a1) && !address.equals(a2)) |
| return -1; |
| if (address.equals(a2) && !address.equals(a1)) |
| return 1; |
| |
| String addressDatacenter = getDatacenter(address); |
| String a1Datacenter = getDatacenter(a1); |
| String a2Datacenter = getDatacenter(a2); |
| if (addressDatacenter.equals(a1Datacenter) && !addressDatacenter.equals(a2Datacenter)) |
| return -1; |
| if (addressDatacenter.equals(a2Datacenter) && !addressDatacenter.equals(a1Datacenter)) |
| return 1; |
| |
| String addressRack = getRack(address); |
| String a1Rack = getRack(a1); |
| String a2Rack = getRack(a2); |
| if (addressRack.equals(a1Rack) && !addressRack.equals(a2Rack)) |
| return -1; |
| if (addressRack.equals(a2Rack) && !addressRack.equals(a1Rack)) |
| return 1; |
| return 0; |
| } |
| } |