spring-kafka Application 源码

2022-08-16
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spring-kafka Application 代码

文件路径：/samples/sample-02/src/main/java/com/example/Application.java

/*
 * Copyright 2018-2021 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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 com.example;

import java.util.HashMap;
import java.util.Map;

import org.apache.kafka.clients.admin.NewTopic;

import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Profile;
import org.springframework.kafka.core.KafkaOperations;
import org.springframework.kafka.listener.DeadLetterPublishingRecoverer;
import org.springframework.kafka.listener.SeekToCurrentErrorHandler;
import org.springframework.kafka.support.converter.DefaultJackson2JavaTypeMapper;
import org.springframework.kafka.support.converter.Jackson2JavaTypeMapper.TypePrecedence;
import org.springframework.kafka.support.converter.JsonMessageConverter;
import org.springframework.kafka.support.converter.RecordMessageConverter;
import org.springframework.util.backoff.FixedBackOff;

import com.common.Bar2;
import com.common.Foo2;

/**
 * Sample shows use of a multi-method listener.
 *
 * @author Gary Russell
 * @since 2.2.1
 *
 */
@SpringBootApplication
public class Application {

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args).close();
	}

	/*
	 * Boot will autowire this into the container factory.
	 */
	@Bean
	public SeekToCurrentErrorHandler errorHandler(KafkaOperations<Object, Object> template) {
		return new SeekToCurrentErrorHandler(
				new DeadLetterPublishingRecoverer(template), new FixedBackOff(1000L, 2));
	}

	@Bean
	public RecordMessageConverter converter() {
		JsonMessageConverter converter = new JsonMessageConverter();
		DefaultJackson2JavaTypeMapper typeMapper = new DefaultJackson2JavaTypeMapper();
		typeMapper.setTypePrecedence(TypePrecedence.TYPE_ID);
		typeMapper.addTrustedPackages("com.common");
		Map<String, Class<?>> mappings = new HashMap<>();
		mappings.put("foo", Foo2.class);
		mappings.put("bar", Bar2.class);
		typeMapper.setIdClassMapping(mappings);
		converter.setTypeMapper(typeMapper);
		return converter;
	}

	@Bean
	public NewTopic foos() {
		return new NewTopic("foos", 1, (short) 1);
	}

	@Bean
	public NewTopic bars() {
		return new NewTopic("bars", 1, (short) 1);
	}

	@Bean
	@Profile("default") // Don't run from test(s)
	public ApplicationRunner runner() {
		return args -> {
			System.out.println("Hit Enter to terminate...");
			System.in.read();
		};
	}

}

相关信息

spring-kafka 源码目录

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spring-kafka MultiMethods 源码

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所属分类： 后端技术
本文标签： Spring Java
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