| /** |
| * 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; |
| |
| /** |
| * This is the core interface of the function api. The process is called |
| * for every message of the input topic of the function. The incoming input bytes |
| * are converted to the input type I for simple Java types(String, Integer, Boolean, |
| * Map, and List types) and for org.Json type. If this serialization approach does not |
| * meet your needs, you can use the byte stream handler defined in RawRequestHandler. |
| */ |
| @FunctionalInterface |
| public interface Function<I, O> { |
| /** |
| * Process the input. |
| * |
| * @return the output |
| */ |
| O process(I input, Context context) throws Exception; |
| } |