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activemq和lingo实现jms和异步调用


  jms是大家在项目中经常用到的技术,而activemq又是开源的jms产品中比较优秀的。在应用jms处理相关业务时,大家都是构造消息,然后发送到队列,最后用message监听器监听到消息,对消息进行分析处理。在这个过程中,有两步是比较麻烦和重复的,那就是构造消息和拆解消息。并且这样与面向对象的思想很是违背。如果这样做显然是面向消息数据的,而不是面向对象的。基于以上原因,我向大家介绍一个我在项目中经过实践的开源框架:lingo.
  
  lingo在jms中起的主要作用就是对消息的封装,它让你可以不必关心消息的构造和拆解,而只需关心你本身的业务逻辑。我将举一个例子,分别用activemq直接实现和用lingo实现。在这个例子中我用到了spring framework.
  
  =================================hello.java===========================
  
  import java.io.serializable;
  
  /**hello.java用来传递java对象
  * author: cjp
  * date: 2005-11-8
  * time: 22:24:02
  */
  public class hello implements serializable {
  private string id;
  private hello hello;
  private pointlist pointlist;
  public string getid() {
  return id;
  }
  
  public void setid(string id) {
  this.id = id;
  }
  
  public hello gethello() {
  return hello;
  }
  
  public void sethello(hello hello) {
  this.hello = hello;
  }
  }
  
  =========================springtest .java========================
  
  import org.springframework.jms.core.jmstemplate;
  import org.springframework.jms.core.messagecreator;
  import org.springframework.test.abstractdependencyinjectionspringcontexttests;
  
  import javax.jms.*;
  
  /**
  
  *发送jms消息
  
  */
  public class springtest extends abstractdependencyinjectionspringcontexttests
  {
  protected string[] getconfiglocations()
  {
  return new string[]{"file:d://wosame//test//com//wosame//room//jms//jms.xml"};
  }
  
  public void testsendmessage() throws exception
  {
  jmstemplate jmstemplate = (jmstemplate) applicationcontext.getbean("jmstemplate");
  jmstemplate.send(new messagecreator()
  {
  public message createmessage(session session) throws jmsexception
  {
  objectmessage message=session.createobjectmessage();
  hello hello=new hello();
  hello.setid("test");
  message.setobject(hello);
  return message;
  }
  });
  }
  }
  
  ================================hellomdp .java==================================
  
  /**
  
  处理jms消息
  
  */
  
  import org.apache.commons.logging.log;
  import org.apache.commons.logging.logfactory;
  import javax.jms.*;
  
  public class hellomdp implements messagelistener
  {
  protected log log = logfactory.getlog(hellomdp.class);
  
  public void onmessage(message message)
  {
  try
  {
  objectmessage objmessage = (objectmessage) message;
  hello hello= (hello) objmessage.getobject();
  system.out.println("hello.getid() = " + hello.getid());
  } catch (jmsexception e)
  {
  log.error("parse failed", e);
  }
  }
  }
  
  ================================jms.xml==================================
  
  <?xml version="1.0" encoding="utf-8"?>
  <!doctype beans public "-//spring//dtd bean//en"
  "http://www.springframework.org/dtd/spring-beans.dtd">
  
  <beans>
  
  <!--嵌入式的jms连接,也就是跟随jvm一起启动,可以参看activemq的文档-->
  <bean id="connectionfactory" class="org.activemq.activemqconnectionfactory"> <property name="brokerurl" value="vm://localhost"/>
  <property name="useembeddedbroker" value="true"/>
  </bean>
  
  <!--消息监听器,也就是消息的具体的处理器-->
  <bean id="hellomdp" class="hellomdp"/>
  
  <!--jms监听需要jta容器的支持-->
  <bean id="activemqcontainer" class="org.activemq.jca.jcacontainer">
  <property name="workmanager">
  <bean id="workmanager" class="org.activemq.work.springworkmanager"/>
  </property>
  <property name="resourceadapter">
  <bean id="activemqresourceadapter" class="org.activemq.ra.activemqresourceadapter">
  <property name="serverurl" value="vm://localhost"/>
  </bean>
  </property>
  </bean>
  
  <!--消息的消费者,也就是将监听器与具体的队列关联-->
  <bean id="helloqueueconsumer" factory-method="addconnector" factory-bean="activemqcontainer">
  <property name="activationspec">
  <bean class="org.activemq.ra.activemqactivationspec">
  <property name="destination" value="hello.queue"/>
  <property name="destinationtype" value="javax.jms.queue"/>
  </bean>
  </property>
  <property name="ref" value="hellomdp"/>
  </bean>
  
  <!--spring的jms template,用来发送jms消息到指定的队列-->
  <bean id="jmstemplate" class="org.springframework.jms.core.jmstemplate">
  <property name="defaultdestinationname" value="hello.queue"/>
  <property name="connectionfactory" ref="connectionfactory"/>
  </bean>
  </beans>

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