Glassfish CDI Producer

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Producerとは？
Logger Producer
Producer 側で Injection を使うこともできる

Producerとは？ †

CDI で Injection されるオブジェクトの作り方

通常は

@Stateless
public class HelloService {
}

public class UserMgr {
  @Inject
  private HelloService hello;
  
  public void doSomething() {
    hello.sayHello();
    ...
  }
}

というように、スコープを付けた POJO を @Inject で Injection する。せいぜい @Named でインスタンスを使い分けるくらい

初期化処理を行った Object を Injection させたいときにはどうするか?
- Producer を使う
- CDI で Injection をされるオブジェクトの作り方の一つ ⇒ Glassfish CDI#q07892e1

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Logger Producer †

Producer

package com.mycompany.cdiexam;

import javax.enterprise.context.Dependent;
import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.inject.Named;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Named
@Dependent
public class LoggerProducer {
    @Produces
    public Logger getLogger(InjectionPoint ip){
        return LoggerFactory.getLogger(ip.getMember().getDeclaringClass().getName());
    }
}

@Dependent は、Injection された側の Scope で管理されることを示すスコープ

Injection

package com.mycompany.cdiexam;

...

@WebServlet(name = "HelloServlet", urlPatterns = {"/HelloServlet"})
public class HelloServlet extends HttpServlet {

    @Inject
    private HelloCDI helloCdi;
    
    @Inject
    transient Logger logger;

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            logger.info("Start Response");
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet HelloServlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>" + helloCdi.hello("Az") + "</h1>");
            out.println("</body>");
            out.println("</html>");
        } finally {
            logger.info("End Response");
            out.close();
        }
    }
    ....

logback.xml

<configuration>
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <prudent>true</prudent>
 
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>/Users/atsushi/GlassFish40/glassfish/domains/domain1/logs/app_%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%date %-5level %logger{35} - %msg%n</pattern>
        </encoder>
    </appender>
 
    <root level="INFO">
        <appender-ref ref="FILE" />
    </root>
</configuration>

実行結果

[~/GlassFish40/glassfish/domains/domain1/logs]$ cat app_2015-01-10.log
2015-01-10 23:05:01,753 INFO  com.mycompany.cdiexam.HelloServlet - Start Response
2015-01-10 23:05:01,756 INFO  com.mycompany.cdiexam.HelloServlet - End Response
2015-01-10 23:05:48,909 INFO  com.mycompany.cdiexam.HelloServlet - Start Response
2015-01-10 23:05:48,922 INFO  com.mycompany.cdiexam.HelloServlet - End Response

ちゃんと
```
@Produces
public Logger getLogger(InjectionPoint ip){
```
の ip から injection する側の Object が取得できている

↑

Producer 側で Injection を使うこともできる †

きしだのはてなに曰く

@Named
@Dependent
public class EntityManagerProducer {
    @PersistenceContext(unitName = "kis_PU")
    @Produces
    private EntityManager em;
}

@Named
@ApplicationScoped
public class BunruiDao {
    @Inject
    private EntityManager em;

    @Transactional
    public void persist(
        @Valid TBunrui bunrui) 
    {
        em.persist(bunrui);
    }
}

Java#Glassfish

Glassfish CDI Producer

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MenuBar

Producerとは？ †

Logger Producer †

Producer 側で Injection を使うこともできる †