在tomcat Web应用程序中集成Kafka生产者和使用者的最佳策略是什么？＆＃39;
我正在使用spring-integration-kafka最新版本。
由于
在Spring MVC中使用相同的代码时，我无法生成消息。但是，它在独立Java程序中使用时可以正常工作。
2015-03-06 15:46:46 DEBUG QueueChannel:383 - postSend (sent=true) on channel 'inputToKafka', message: GenericMessage [payload=EventLogEvent{key=com.springapp.mvc.util.EventLogEventKey@cb5d2218, numberOfEvents=10, resetCounterInDays=5, template=6, proposition=5}, headers={timestamp=1425653206240, id=eccb00b0-6617-b5c4-6de0-45a08730041e, messageKey=1, kafka_topic=test-hs}]
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:1610 - Invoking afterPropertiesSet() on bean with name 'hello'
2015-03-06 15:46:46 DEBUG TestDispatcherServlet:1225 - Rendering view [org.springframework.web.servlet.view.InternalResourceView: name 'hello'; URL [/WEB-INF/pages/hello.jsp]] in DispatcherServlet with name ''
2015-03-06 15:46:46 DEBUG InternalResourceView:432 - Added model object 'message' of type [java.lang.String] to request in view with name 'hello'
2015-03-06 15:46:46 DEBUG InternalResourceView:166 - Forwarding to resource [/WEB-INF/pages/hello.jsp] in InternalResourceView 'hello'
2015-03-06 15:46:46 DEBUG MockRequestDispatcher:67 - MockRequestDispatcher: forwarding to [/WEB-INF/pages/hello.jsp]
2015-03-06 15:46:46 DEBUG TestDispatcherServlet:996 - Successfully completed request
2015-03-06 15:46:46 DEBUG DirtiesContextTestExecutionListener:86 - After test method: context [DefaultTestContext@68af6fa0 testClass = AppTests, testInstance = com.springapp.mvc.AppTests@55c9a711, testMethod = simple@AppTests, testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@70e08379 testClass = AppTests, locations = '{file:src/main/webapp/WEB-INF/mvc-dispatcher-servlet.xml}', classes = '{}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{}', resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.test.context.web.WebDelegatingSmartContextLoader', parent = [null]]], class dirties context [false], class mode [null], method dirties context [false].
2015-03-06 15:46:46 DEBUG ServletTestExecutionListener:147 - Resetting RequestContextHolder for test context [DefaultTestContext@68af6fa0 testClass = AppTests, testInstance = com.springapp.mvc.AppTests@55c9a711, testMethod = simple@AppTests, testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@70e08379 testClass = AppTests, locations = '{file:src/main/webapp/WEB-INF/mvc-dispatcher-servlet.xml}', classes = '{}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{}', resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.test.context.web.WebDelegatingSmartContextLoader', parent = [null]]].
2015-03-06 15:46:46 DEBUG DirtiesContextTestExecutionListener:118 - After test class: context [DefaultTestContext@68af6fa0 testClass = AppTests, testInstance = [null], testMethod = [null], testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@70e08379 testClass = AppTests, locations = '{file:src/main/webapp/WEB-INF/mvc-dispatcher-servlet.xml}', classes = '{}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{}', resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.test.context.web.WebDelegatingSmartContextLoader', parent = [null]]], dirtiesContext [false].
2015-03-06 15:46:46 INFO GenericWebApplicationContext:862 - Closing org.springframework.web.context.support.GenericWebApplicationContext@5f0dd6db: startup date [Fri Mar 06 15:46:45 CET 2015]; root of context hierarchy
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:247 - Returning cached instance of singleton bean 'org.springframework.integration.config.IdGeneratorConfigurer#0'
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:247 - Returning cached instance of singleton bean 'integrationHeaderChannelRegistry'
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:247 - Returning cached instance of singleton bean 'globalChannelInterceptorProcessor'
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:247 - Returning cached instance of singleton bean 'kafkaOutboundChannelAdapter'
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:247 - Returning cached instance of singleton bean 'kafkaProducerContext'
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:247 - Returning cached instance of singleton bean '_org.springframework.integration.errorLogger'
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:247 - Returning cached instance of singleton bean 'lifecycleProcessor'
2015-03-06 15:46:46 INFO DefaultLifecycleProcessor:356 - Stopping beans in phase 1073741823
2015-03-06 15:46:46 INFO DefaultLifecycleProcessor:356 - Stopping beans in phase 0
2015-03-06 15:46:46 DEBUG DefaultLifecycleProcessor:226 - Asking bean 'kafkaProducerContext' of type [class org.springframework.integration.kafka.support.KafkaProducerContext] to stop
2015-03-06 15:46:46 INFO Producer:68 - Shutting down producer
2015-03-06 15:46:46 INFO ProducerPool:68 - Closing all sync producers
2015-03-06 15:46:46 DEBUG DefaultLifecycleProcessor:235 - Bean 'kafkaProducerContext' completed its stop procedure
2015-03-06 15:46:46 DEBUG DefaultLifecycleProcessor:226 - Asking bean '_org.springframework.integration.errorLogger' of type [class org.springframework.integration.config.ConsumerEndpointFactoryBean] to stop
2015-03-06 15:46:46 INFO EventDrivenConsumer:83 - Removing {logging-channel-adapter:_org.springframework.integration.errorLogger} as a subscriber to the 'errorChannel' channel
2015-03-06 15:46:46 INFO PublishSubscribeChannel:69 - Channel 'org.springframework.web.context.support.GenericWebApplicationContext@5f0dd6db.errorChannel' has 0 subscriber(s).
2015-03-06 15:46:46 DEBUG DefaultLifecycleProcessor:235 - Bean '_org.springframework.integration.errorLogger' completed its stop procedure
2015-03-06 15:46:46 INFO EventDrivenConsumer:131 - stopped _org.springframework.integration.errorLogger
2015-03-06 15:46:46 INFO DefaultLifecycleProcessor:356 - Stopping beans in phase -2147483648
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:499 - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@53164a3b: defining beans [channelInitializer,$autoCreateChannelCandidates,IntegrationConfigurationBeanFactoryPostProcessor,integrationEvaluationContext,org.springframework.integration.expression.IntegrationEvaluationContextAwareBeanPostProcessor#0,integrationGlobalProperties,integrationHeaderChannelRegistry,globalChannelInterceptorProcessor,jsonPath,xpath,toStringFriendlyJsonNodeToStringConverter,converterRegistrar,integrationConversionService,DefaultConfiguringBeanFactoryPostProcessor,datatypeChannelMessageConverter,messageBuilderFactory,inputToKafka,org.springframework.integration.kafka.outbound.KafkaProducerMessageHandler#0,org.springframework.scheduling.support.PeriodicTrigger#0,kafkaOutboundChannelAdapter,taskExecutor,kafkaSpecificEncoder,producerProperties,kafkaProducerContext,helloController,kafkaProducer,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.web.servlet.view.InternalResourceViewResolver#0,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.enhancedConfigurationProcessor,nullChannel,errorChannel,_org.springframework.integration.errorLogger,taskScheduler,org.springframework.integration.config.IdGeneratorConfigurer#0]; root of factory hierarchy
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:555 - Retrieved dependent beans for bean '(inner bean)#220d52b8': [_org.springframework.integration.errorLogger]
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:555 - Retrieved dependent beans for bean '(inner bean)#40452b0f': [kafkaOutboundChannelAdapter]
2015-03-06 15:46:46 DEBUG DisposableBeanAdapter:245 - Invoking destroy() on bean with name 'taskExecutor'
2015-03-06 15:46:46 INFO ThreadPoolTaskExecutor:203 - Shutting down ExecutorService
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:555 - Retrieved dependent beans for bean '(inner bean)#2051acec': [kafkaProducerContext]
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:555 - Retrieved dependent beans for bean '(inner bean)#1d79997b': [(inner bean)#2051acec]
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:555 - Retrieved dependent beans for bean '(inner bean)#1d79997b#1': [(inner bean)#7779ad44]
2015-03-06 15:46:46 DEBUG DisposableBeanAdapter:245 - Invoking destroy() on bean with name 'taskScheduler'
2015-03-06 15:46:46 INFO ThreadPoolTaskScheduler:203 - Shutting down ExecutorService 'taskScheduler'
2015-03-06 15:46:46 DEBUG DefaultListableBeanFactory:555 - Retrieved dependent beans for bean '(inner bean)#77ce5421': [taskScheduler]
下面粘贴了相同的代码。定义了两个资源，一个使用Kafka本机Java API，它正在工作。其他资源正在使用spring-integration，但它无法正常工作。
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:int-kafka="http://www.springframework.org/schema/integration/kafka"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/integration/kafka http://www.springframework.org/schema/integration/kafka/spring-integration-kafka.xsd
http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
<context:component-scan base-package="com.springapp.mvc"/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<int:channel id="inputToKafka">
<int:queue/>
</int:channel>
<int-kafka:outbound-channel-adapter id="kafkaOutboundChannelAdapter"
kafka-producer-context-ref="kafkaProducerContext"
auto-startup="false"
channel="inputToKafka"
order="1"
>
<int:poller fixed-delay="10" time-unit="MILLISECONDS" receive-timeout="0" task-executor="taskExecutor"/>
</int-kafka:outbound-channel-adapter>
<task:executor id="taskExecutor" pool-size="10" keep-alive="120" queue-capacity="500"/>
<bean id="producerProperties"
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="properties">
<props>
<prop key="topic.metadata.refresh.interval.ms">3600000</prop>
<prop key="message.send.max.retries">5</prop>
<prop key="serializer.class">kafka.serializer.StringEncoder</prop>
<prop key="request.required.acks">1</prop>
</props>
</property>
</bean>
<int-kafka:producer-context id="kafkaProducerContext"
producer-properties="producerProperties">
<int-kafka:producer-configurations>
<int-kafka:producer-configuration broker-list="172.16.1.13:9092"
topic="test-hs"
value-class-type="java.lang.Object"
compression-codec="default"/>
</int-kafka:producer-configurations>
</int-kafka:producer-context>
控制器类
package com.springapp.mvc;
import com.springapp.mvc.util.EventLogEvent;
import com.springapp.mvc.util.EventLogEventKey;
import com.springapp.mvc.util.KafkaEventLogWriterChannel;
import com.springapp.mvc.util.KafkaProducer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.http.HttpStatus;
import org.springframework.integration.channel.QueueChannel;
import org.springframework.integration.kafka.support.KafkaHeaders;
import org.springframework.integration.kafka.support.KafkaProducerContext;
import org.springframework.integration.support.MessageBuilder;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseStatus;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
@Controller
@RequestMapping("/")
public class KafkaController {
@Autowired
private KafkaProducer kafkaProducer;
@RequestMapping(method = RequestMethod.GET)
public String printWelcome(ModelMap model) {
model.addAttribute("message", "Hello world!");
kafkaProducer.sendMessageToKafka();
return "hello";
}
@RequestMapping(value = "/native", method = RequestMethod.PUT)
@ResponseStatus(HttpStatus.NO_CONTENT)
public void nativeAPI(@RequestBody String bookCase) throws Exception {
KafkaEventLogWriterChannel ch = new KafkaEventLogWriterChannel("test-hs");
Map<String, String> data = new HashMap<String, String>();
data.put("kafka.api", "native");
ch.writeData(data);
}
@RequestMapping(value = "/spring", method = RequestMethod.PUT)
@ResponseStatus(HttpStatus.NO_CONTENT)
public void springIntegration(@RequestBody String bookCase) throws Exception {
kafkaProducer.sendMessageToKafka();
}
}
使用spring-integration 1.0 API发送消息的类。
package com.springapp.mvc.util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.integration.kafka.support.KafkaHeaders;
import org.springframework.messaging.MessageChannel;
import org.springframework.stereotype.Component;
import java.util.HashMap;
import java.util.Map;
/**
* Created by hs on 06-03-2015.
*/
@Component
public class KafkaProducer {
@Autowired
@Qualifier("inputToKafka")
MessageChannel inputToKafka;
public void sendMessageToKafka()
{
Map<String, String> data = new HashMap<String, String>();
data.put("kafka.api", "spring-integration");
boolean status = inputToKafka.send(org.springframework.integration.support.MessageBuilder.withPayload(data).setHeader("messageKey", String.valueOf(1)).setHeader(KafkaHeaders.TOPIC, "test-hs").build());
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：1)
请更具体一点。
Spring集成Kafka支持只是Spring Integration的扩展，而Spring集成又是Spring Framework的扩展。
由于您可以简单地实现Spring MVC Web应用程序，因此任何其他集成内容（如Kafka）都没有任何停止。
由于Spring Integration实现了EIP并为众所周知的协议提供了足够的适配器，并且通过MessageChannel和Message抽象连接所有内容，您只需使用<int-http:inbound-channel-adapter>接受HTTP请求并将其发送到<int-kafka:outbound-channel-adapter>。
从Kafka到HTTP客户端可能不会那么容易做到：但是你可以通过任何其他适配器和协议来实现，比如JDBC（存储Kafka消息）或WebSockets来推送Kafka消息连接的客户。
目前，我认为在基于Spring产品组合的Web应用程序中提供任何所需的集成解决方案没有任何问题。
答案 1 :(得分：0)
我有同样的问题并通过将配置自动启动从错误更改为 true
来解决auto-startup="true"
中的
<int-kafka:outbound-channel-adapter id="kafkaOutboundChannelAdapter"
kafka-producer-context-ref="kafkaProducerContext"
auto-startup="false"
channel="inputToKafka"
order="1"
>
有效！