| /** |
| * 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 java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.Executors; |
| import java.util.stream.Collectors; |
| import org.apache.pulsar.functions.api.Context; |
| import org.apache.pulsar.functions.api.Function; |
| import org.slf4j.Logger; |
| |
| public class AsyncContextFunction implements Function<String, CompletableFuture<Void>> { |
| @Override |
| public CompletableFuture<Void> process(String input, Context context) { |
| Logger LOG = context.getLogger(); |
| CompletableFuture<Void> future = new CompletableFuture(); |
| |
| // this method only delay a function execute. |
| Executors.newCachedThreadPool().submit(() -> { |
| try { |
| Thread.sleep(500); |
| } catch (Exception e) { |
| LOG.error("Exception when Thread.sleep", e); |
| future.completeExceptionally(e); |
| } |
| |
| String inputTopics = context.getInputTopics().stream().collect(Collectors.joining(", ")); |
| String funcName = context.getFunctionName(); |
| |
| String logMessage = String |
| .format("A message with value of \"%s\" has arrived on one of the following topics: %s\n", |
| input, inputTopics); |
| LOG.info(logMessage); |
| |
| String metricName = String.format("function-%s-messages-received", funcName); |
| context.recordMetric(metricName, 1); |
| |
| future.complete(null); |
| }); |
| |
| return future; |
| } |
| } |