sijie commented on a change in pull request #4005: Set key for message when using function publish URL: https://github.com/apache/pulsar/pull/4005#discussion_r275094579
########## File path: pulsar-functions/java-examples/src/main/java/org/apache/pulsar/functions/api/examples/PublishFunctionWithMessageConf.java ########## @@ -0,0 +1,51 @@ +/** + * 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.pulsar.functions.api.examples; + +import org.apache.pulsar.functions.api.Context; +import org.apache.pulsar.functions.api.Function; + +import java.util.HashMap; +import java.util.Map; + +/** + * Example function that uses the built in publish function in the context + * to publish to a desired topic based on config and setting various message configurations to be passed along. + * + */ +public class PublishFunctionWithMessageConf implements Function<String, Void> { + @Override + public Void process(String input, Context context) { + String publishTopic = (String) context.getUserConfigValueOrDefault("publish-topic", "publishtopic"); + String output = String.format("%s!", input); + + Map<String, String> properties = new HashMap<>(); + properties.put("input_topic", context.getCurrentRecord().getTopicName().get()); + properties.putAll(context.getCurrentRecord().getProperties()); + + Map<String, Object> messageConf = new HashMap<>(); + messageConf.put("properties", properties); + if (context.getCurrentRecord().getKey().isPresent()) { + messageConf.put("key", context.getCurrentRecord().getKey().get()); + } + messageConf.put("eventTime", System.currentTimeMillis()); Review comment: nit: can we use the constants defined in `TypedMessageBuilder.java` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
