/** * 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 topic, key, and value. * If a partition key is provided it will override the key for the purpose of partitioning but will not be stored. */ case class KeyedMessage[K, V](val topic: String, val key: K, val partKey: Any, val message: V) { if(topic == null) throw new IllegalArgumentException("Topic cannot be null.") def this(topic: String, message: V) = this(topic, null.asInstanceOf[K], null, message) def this(topic: String, key: K, message: V) = this(topic, key, key, message) def partitionKey = { if(partKey != null) partKey else if(hasKey) key else null } def hasKey = key != null }