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자바- 웹 프레임웍 진영에 있는 Spring Boot에 AKKA를 내장시키는 방법을 알아보겠습니다.

AKKA 준비과정은 이것보다 훨씬더 간단하지만 SpringBoot에 AKKA라는 외부툴킷을 내재시키고

상호운영하기위해서는 SpringBoot에서 제안하는 표준적인 방법으로 확장시켜야하며 약간의 수고가 필요합니다.

Sprint Boot 을 사용하는 방법은 AKKA주제와 별개로 Spring-BOOT 정리되었습니다.


메이븐설정

Spring Boot 1.5.9 와 Akka 2.4.8 버젼에서 테스트 되었으나

...

Code Block
languagejava
themeEmacs
titleextension.SpringActorProducer
package com.psmon.cachedb.extension;

import akka.actor.Actor;
import akka.actor.IndirectActorProducer;
import org.springframework.context.ApplicationContext;

/**
 * An actor producer that lets Spring create the Actor instances.
 */
public class SpringActorProducer implements IndirectActorProducer {

    private final ApplicationContext applicationContext;
    private final String actorBeanName;
    private final Object[] args;

    public SpringActorProducer(ApplicationContext applicationContext,
        String actorBeanName) {
        this.applicationContext = applicationContext;
        this.actorBeanName = actorBeanName;
    }

    @Override
this.args = null;
  public Actor produce() {}
    
    returnpublic SpringActorProducer(Actor)ApplicationContext applicationContext.getBean(actorBeanName);
    }

, String actorBeanName, Object... args) {
       @Override
 this.applicationContext = applicationContext;
 public Class<? extends Actor> actorClass() {
  this.actorBeanName = actorBeanName;
    return (Class<? extends Actor>) applicationContext.getType(actorBeanName)this.args = args;
    }
}
Code Block
languagejava
themeEmacs
titleextenstion.SpringExtension 
package com.psmon.cachedb.extension;

import akka.actor.Extension;
import akka.actor.Props;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

/**
 * Extension to tell Akka how to create beans via Spring.
 */
@Component
public class SpringExtension implements Extension {

    private ApplicationContext applicationContext;

    /**

    @Override
    public Actor produce() {
        return args == null ? 
              (Actor) applicationContext.getBean(actorBeanName):
     * Used to initialize the Spring application context for the(Actor) extension.
 applicationContext.getBean(actorBeanName, args);
    }

    */@Override
    public Class<? extends voidActor> initializeactorClass(ApplicationContext applicationContext) {
        return  this.applicationContext = applicationContext(Class<? extends Actor>) applicationContext.getType(actorBeanName);
    }

    /**
     * Create a Props for the specified actorBeanName using the
     * SpringActorProducer class.
     */
    public Props props(String actorBeanName) }


Code Block
languagejava
themeEmacs
titleextenstion.SpringExtension 
package com.psmon.cachedb.extension;

import akka.actor.Extension;
import akka.actor.Props;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

/**
 * Extension to tell Akka how to create beans via Spring.
 */
@Component
public class SpringExtension implements Extension {

    private ApplicationContext applicationContext;

    /**
     * Used to initialize the Spring application context for the extension.{
        return Props.create(SpringActorProducer.class,
     */
    public void initialize(ApplicationContext applicationContext,) actorBeanName);{
     }
}
Code Block
languagejava
themeEmacs
titleconfig.ApplicationConfiguration 
package com.psmon.cachedb.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Lazy;
import org.springframework.context.event.EventListener;

import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;

import com.psmon.cachedb.extension.SpringExtension;

import akka.actor.ActorSystem;

@Configuration
@Lazy
@ComponentScan(basePackages = { "com.psmon.cachedb.services",
    "com.psmon.cachedb.actors", "com.psmon.cachedb.extension" })
public class ApplicationConfiguration {

    @Autowired
    private ApplicationContext applicationContext;

    @Autowired
    private SpringExtension springExtension;


	@Autowired
	private Environment env;

    @Bean
    public ActorSystem actorSystem() {

        ActorSystem system = ActorSystem
            .create("AkkaTestApp", akkaConfiguration());   this.applicationContext = applicationContext;
    }

    /**
     * Create a Props for the specified actorBeanName using the
     * SpringActorProducer class.
     */
    public Props props(String actorBeanName, Object... args) {
        return (args != null && args.length > 0) ?
             Props.create(SpringActorProducer.class,
                     applicationContext,
                     actorBeanName, args) :
             Props.create(SpringActorProducer.class,
        springExtension.initialize(applicationContext);             applicationContext,
          return system;
    }

	@Bean
	public Config akkaConfiguration() {

		String akkaip = env.getProperty("akka.remote.netty.tcp.ip" actorBeanName);
		String port = env.getProperty("akka.remote.netty.tcp.port");

        // 기존 Akka설정과(application.conf) + 최종계산된 Spring의 설정(appplication.properties)를 머징시키는방법
        // AKKA에서 필요한 기능들 설정은 충분히한후, 변경요소를 Spring설정을 노출하여 변경하는 방식
		return ConfigFactory.load().withValue("akka.remote.netty.tcp.ip", ConfigValueFactory.fromAnyRef(akkaip))
				.withValue("akka.remote.netty.tcp.port", ConfigValueFactory.fromAnyRef(port));

	}

	@EventListener(ApplicationReadyEvent.class)
	public void doSomethingAfterStartup() {
	}
	
}

Step2 - 로그환경 준비하기 ( 5 )

동시성 메시지 처리는 로그파악이 중요함으로, 꼭 설정을한후 사용을 합니다.

그래야 초반부터 System.out.print(...) 와같은 코드를 사용하지 않고 로그기반으로

Trace를 하는 습관을 가지게 됩니다. 여기서는 logback 기본 콘솔모드 설정을 사용하였으며

logback은 다양한 방법의 로그방식을 추가할수 있는 유용한 로그 라이브러리 입니다.

     }   
}


Code Block
languagejava
themeEmacs
titleconfig.ApplicationConfiguration 
package com.psmon.cachedb.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Lazy;
import org.springframework.context.event.EventListener;

import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;

import com.psmon.cachedb.extension.SpringExtension;

import akka.actor.ActorSystem;

@Configuration
@Lazy
@ComponentScan(basePackages = { "com.psmon.cachedb.services",
    "com.psmon.cachedb.actors", "com.psmon.cachedb.extension" })
public class ApplicationConfiguration {

    @Autowired
    private ApplicationContext applicationContext;

    @Autowired
    private SpringExtension springExtension;


	@Autowired
	private Environment env;

    @Bean
    public ActorSystem actorSystem() {

        ActorSystem system = ActorSystem
            .create("AkkaTestApp", akkaConfiguration());
        springExtension.initialize(applicationContext);        
        return system;
    }

	@Bean
	public Config akkaConfiguration() {

		String akkaip = env.getProperty("akka.remote.netty.tcp.ip");
		String port = env.getProperty("akka.remote.netty.tcp.port");

        // 기존 Akka설정과(application.conf) + 최종계산된 Spring의 설정(appplication.properties)를 머징시키는방법
        // AKKA에서 필요한 기능들 설정은 충분히한후, 변경요소를 Spring설정을 노출하여 변경하는 방식
		return ConfigFactory.load().withValue("akka.remote.netty.tcp.ip", ConfigValueFactory.fromAnyRef(akkaip))
				.withValue("akka.remote.netty.tcp.port", ConfigValueFactory.fromAnyRef(port));

	}

	@EventListener(ApplicationReadyEvent.class)
	public void doSomethingAfterStartup() {
	}
	
}


Step2 - 로그환경 준비하기 ( 5 )

동시성 메시지 처리는 로그파악이 중요함으로, 꼭 설정을한후 사용을 합니다.

그래야 초반부터 System.out.print(...) 와같은 코드를 사용하지 않고 로그기반으로

Trace를 하는 습관을 가지게 됩니다. 여기서는 logback 기본 콘솔모드 설정을 사용하였으며

logback은 다양한 방법의 로그방식을 추가할수 있는 유용한 로그 라이브러리 입니다.

Code Block
languagejava
themeEmacs
#application.propertis
logging.config=classpath:logback-spring.xml


#application.conf
akka {

  loggers = ["akka.event.Logging$DefaultLogger"]

  loglevel = "INFO"

  stdout-loglevel = "ERROR"

}


#logback-spring.xml
<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%date{ISO8601} %-5level %X{akkaSource} - %msg%n</pattern>
    </encoder>
  </appender>

  <root level="INFO">
    <appender-ref ref="STDOUT" />
  </root>

</configuration>



Step2.1 - 로그변경(Slf4jLogger)

Code Block
languagejava
themeEmacs
# application.conf
akka {
  loggers = ["akka.event.slf4j.Slf4jLogger"]
  loglevel = "DEBUG"
  log-config-on-start = on
}


# pom.xml
<dependency>
	<groupId>com.typesafe.akka</groupId>
	<artifactId>akka-slf4j_2.12</artifactId>
	<version>${akka.version}</version>
</dependency>	


# logback-spring.xml
<logger name="org.springframework.data" level="error" />
<logger name="akka" level="error" />
No Format
#application.propertis
logging.config=classpath:logback-spring.xml


#application.conf
akka {

  loggers = ["akka.event.Logging$DefaultLogger"]

  loglevel = "INFO"

  stdout-loglevel = "ERROR"

}


#logback-spring.xml
<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%date{ISO8601} %-5level %X{akkaSource} - %msg%n</pattern>
    </encoder>
  </appender>

  <root level="INFO">
    <appender-ref ref="STDOUT" />
  </root>

</configuration>



Step3. 액터설계하기

받은 메시지를 단순하게 출력을 하는 TestActor입니다.

...

실행후 위 로그를 확인하였다면.. Spring과 Akka의 연합작전이 성공한것입니다.


참조: