| /** |
| * 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 kafka.producer |
| |
| /** |
| * A partitioner controls the mapping between user-provided keys and kafka partitions. Users can implement a custom |
| * partitioner to change this mapping. |
| * |
| * Implementations will be constructed via reflection and are required to have a constructor that takes a single |
| * VerifiableProperties instance--this allows passing configuration properties into the partitioner implementation. |
| */ |
| trait Partitioner { |
| /** |
| * Uses the key to calculate a partition bucket id for routing |
| * the data to the appropriate broker partition |
| * @return an integer between 0 and numPartitions-1 |
| */ |
| def partition(key: Any, numPartitions: Int): Int |
| } |
