flex4 + spring + blazeds , 使用anonation(注解)机制，利用push技术的实现例子和过程。

实现目标：java做后台service，每隔300毫秒，生成一个uuid，以 testJob做为订阅关键词，发布给所有订阅此关键词的flex客户端。

 

配置过程和源码：

 

1.修改blazeds自动生成的WEB-INF/flex/services-config.xml文件。由于原来没有polling-amf的定义，所以需要加入。代码如下：

 

<?xml version="1.0" encoding="UTF-8"?>
<services-config>
    <services>
        <service-include file-path="remoting-config.xml" />
        <service-include file-path="proxy-config.xml" />
        <service-include file-path="messaging-config.xml" />
    </services>
    <security>
        <login-command class="flex.messaging.security.TomcatLoginCommand" server="Tomcat"/>
        <!-- Uncomment the correct app server
        <login-command class="flex.messaging.security.TomcatLoginCommand" server="JBoss">
        <login-command class="flex.messaging.security.JRunLoginCommand" server="JRun"/>
        <login-command class="flex.messaging.security.WeblogicLoginCommand" server="Weblogic"/>
        <login-command class="flex.messaging.security.WebSphereLoginCommand" server="WebSphere"/>
        -->
        <!--
        <security-constraint id="basic-read-access">
            <auth-method>Basic</auth-method>
            <roles>
                <role>guests</role>
                <role>accountants</role>
                <role>employees</role>
                <role>managers</role>
            </roles>
        </security-constraint>
         -->
    </security>
    <channels>
        <channel-definition id="my-amf" class="mx.messaging.channels.AMFChannel">
            <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/amf" class="flex.messaging.endpoints.AMFEndpoint"/>
        </channel-definition>
        <channel-definition id="my-secure-amf" class="mx.messaging.channels.SecureAMFChannel">
            <endpoint url="https://{server.name}:{server.port}/{context.root}/messagebroker/amfsecure" class="flex.messaging.endpoints.SecureAMFEndpoint"/>
            <properties>
                <add-no-cache-headers>false</add-no-cache-headers>
            </properties>
        </channel-definition>
         <channel-definition id="my-polling-amf" class="mx.messaging.channels.AMFChannel">
            <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/amfpolling" class="flex.messaging.endpoints.AMFEndpoint"/>
            <properties>
                <polling-enabled>true</polling-enabled>
                <polling-interval-seconds>4</polling-interval-seconds>
            </properties>
        </channel-definition>

        <channel-definition id="my-longpolling-amf" class="mx.messaging.channels.AMFChannel">
            <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/amflongpolling" class="flex.messaging.endpoints.AMFEndpoint"/>
            <properties>
                <polling-enabled>true</polling-enabled>
                <polling-interval-seconds>5</polling-interval-seconds>
                <wait-interval-millis>60000</wait-interval-millis>
                <client-wait-interval-millis>1</client-wait-interval-millis>
                <max-waiting-poll-requests>200</max-waiting-poll-requests>
                <user-agent-settings>
                    <!-- MSIE 5, 6, 7 default max number of permanent HTTP connections is 2. -->
                    <user-agent match-on="MSIE" max-streaming-connections-per-session="1"/>
                    <!-- MSIE 8 max number is 6. -->
                    <user-agent match-on="MSIE 8" max-streaming-connections-per-session="5"/>
                    <!-- Firefox 1, 2 max number is 2. -->
                    <user-agent match-on="Firefox" max-streaming-connections-per-session="1"/>
                    <!-- Firefox 3 max number is 6. -->
                    <user-agent match-on="Firefox/3" max-streaming-connections-per-session="5"/>
                    <!-- Safari 3, 4 max number is 4. -->
                    <user-agent match-on="Safari" max-streaming-connections-per-session="3"/>
                    <!-- Chrome 0, 1, 2 max number is 6. -->
                    <user-agent match-on="Chrome" max-streaming-connections-per-session="5"/>
                    <!-- Opera 7, 9 max number is 4.-->
                    <user-agent match-on="Opera" max-streaming-connections-per-session="3"/>
                    <!-- Opera 8 max number is 8. -->
                    <user-agent match-on="Opera 8" max-streaming-connections-per-session="7"/>
                    <!-- Opera 10 max number is 8. -->
                    <user-agent match-on="Opera 10" max-streaming-connections-per-session="7"/>
                </user-agent-settings>
            </properties>
        </channel-definition>

        <channel-definition id="my-streaming-amf" class="mx.messaging.channels.StreamingAMFChannel">
            <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/streamingamf" class="flex.messaging.endpoints.StreamingAMFEndpoint"/>
        </channel-definition>
        <!--
        <channel-definition id="my-http" class="mx.messaging.channels.HTTPChannel">
            <endpoint url="http://{server.name}:{server.port}/{context.root}/messagebroker/http" class="flex.messaging.endpoints.HTTPEndpoint"/>
        </channel-definition>
        <channel-definition id="my-secure-http" class="mx.messaging.channels.SecureHTTPChannel">
            <endpoint url="https://{server.name}:{server.port}/{context.root}/messagebroker/httpsecure" class="flex.messaging.endpoints.SecureHTTPEndpoint"/>
            <properties>
                <add-no-cache-headers>false</add-no-cache-headers>
            </properties>
        </channel-definition>
        -->
    </channels>
    <logging>
        <target class="flex.messaging.log.ConsoleTarget" level="Error">
            <properties>
                <prefix>[BlazeDS] </prefix>
                <includeDate>false</includeDate>
                <includeTime>false</includeTime>
                <includeLevel>false</includeLevel>
                <includeCategory>false</includeCategory>
            </properties>
            <filters>
                <pattern>Endpoint.*</pattern>
                <pattern>Service.*</pattern>
                <pattern>Configuration</pattern>
            </filters>
        </target>
    </logging>
    <system>
        <redeploy>
            <enabled>false</enabled>
            <!--
            <watch-interval>20</watch-interval>
            <watch-file>{context.root}/WEB-INF/flex/services-config.xml</watch-file>
            <watch-file>{context.root}/WEB-INF/flex/proxy-config.xml</watch-file>
            <watch-file>{context.root}/WEB-INF/flex/remoting-config.xml</watch-file>
            <watch-file>{context.root}/WEB-INF/flex/messaging-config.xml</watch-file>
            <watch-file>{context.root}/WEB-INF/flex/data-management-config.xml</watch-file>
            <touch-file>{context.root}/WEB-INF/web.xml</touch-file>
             -->
        </redeploy>
    </system>
</services-config>

 

 

2.在spring的配置文件中定义 defaultMessageTemplate class="org.springframework.flex.messaging.MessageTemplate"

 

<bean id="defaultMessageTemplate" class="org.springframework.flex.messaging.MessageTemplate" />

 

 

之所以要定义这个bean，是为了在做service的时候。可以用注解@Autowired来引入这个MessageTemplate的实例。

3.在web.xml中定义spring和flex的集成。这个配置是使用spring和flex集成时候的配置，和push技术无关。

 

<!-- 定义 spring flex 集成的配置，使用单独的配置文件。
       不使用在一个applicatonContext.xml中import springFlex.xml的方法
       spring flex 一定要用DispatcherServlet 方法。不能用ContextLoaderListener -->
   <servlet>
       <servlet-name>MessagebrokerServlet</servlet-name>
       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
       <init-param>
           <param-name>contextConfigLocation</param-name>
           <param-value>/WEB-INF/classes/META-INF/springFlex.xml</param-value>
       </init-param>
       <load-on-startup>1</load-on-startup>
   </servlet>
   <!-- Map /spring/* requests to the DispatcherServlet -->
   <servlet-mapping>
       <servlet-name>MessagebrokerServlet</servlet-name>
       <url-pattern>/messagebroker/*</url-pattern>
   </servlet-mapping>
   <!-- 定义 spring flex 集成的配置  结束-->

   <!--  访问RDS 定义开始-->
   <servlet>
       <servlet-name>RDSDispatchServlet</servlet-name>
       <servlet-class>flex.rds.server.servlet.FrontEndServlet</servlet-class>
       <init-param>
           <param-name>useAppserverSecurity</param-name>
           <param-value>false</param-value>
       </init-param>
       <init-param>
           <param-name>messageBrokerId</param-name>
           <param-value>_messageBroker</param-value>
       </init-param>
       <load-on-startup>10</load-on-startup>
   </servlet>
   <servlet-mapping id="RDS_DISPATCH_MAPPING">
       <servlet-name>RDSDispatchServlet</servlet-name>
       <url-pattern>/CFIDE/main/ide.cfm</url-pattern>
   </servlet-mapping>
   <!--  访问RDS 定义结束 -->

 

 

4.由于web.xml配置中引入了WEB-INF/classes/META-INF/springFlex.xml这个文件，所以在springFlex.xml文件中进行详细配置

5.springFlex.xml文件如下，主要是定义flex:message-destination ,既是监听的数据的关键词

 

<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:flex="http://www.springframework.org/schema/flex"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/flex
       http://www.springframework.org/schema/flex/spring-flex-1.0.xsd">


     <flex:message-broker>
        <flex:message-service
            default-channels="my-polling-amf" />
    </flex:message-broker>

    <flex:message-destination id="simple-feed" />
    <flex:message-destination id="testJob-feed"/>


</beans>

 

 

6.编写后台推送的java service bean:

 

/***********************************************************************
  *
  *   TestJob.java
  *
  *   ****所有，
  *   受到法律的保护，任何公司或个人，未经授权不得擅自拷贝。
  *   @copyright       Copyright:   2000-2011
  *   @creator          徐泽宇 <br/>
  *   @create-time   2011-6-27   下午11:51:16
  *   @revision         $Id:     *
  ***********************************************************************/
package com.alcor.test.service.quartz;
import java.util.Date;
import java.util.UUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.flex.messaging.MessageTemplate;
import org.springframework.flex.remoting.RemotingDestination;
import org.springframework.flex.remoting.RemotingInclude;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;
import flex.messaging.messages.AsyncMessage;
@Service
@RemotingDestination
public class TestJob {
    /**
     * Logger for this class
     */
    private static final Logger logger = LoggerFactory.getLogger(TestJob.class);
    @Autowired
    MessageTemplate template;

    private static FeedThread thread;

    @RemotingInclude
    public void work3 (){
        if (thread == null) {
            thread = new FeedThread(template);
            thread.start();
        }
    }

    public static class FeedThread extends Thread {
        public boolean running = false;
        private final MessageTemplate template;
        public FeedThread(MessageTemplate template) {
            this.template = template;
            run();
        }
        @Override
        public void run() {
            this.running = true;
            while (this.running) {
            logger.debug("testJob-feed send");
            this.template.send("testJob-feed", UUID.randomUUID().toString());
            // this.template.send("testJob-feed", UUID.randomUUID().toString());
                try {
                    Thread.sleep(300);
                } catch (InterruptedException e) {
                    e.printStackTrace(System.out);
                }
            }
        }
    }
}

 

 

注意：这里使用了@Service，@@RemotingDestination 注解和 @Autowired    MessageTemplate template; 这样就避免了在spring中利用配置文件进行定义bean。

如果要使用spring 配置文件来定义。可以参考下面代码（来自blazeds的官方例子中的spring配置文件）

 

<!-- MessageTemplate makes it easy to publish messages -->
   <bean id="defaultMessageTemplate" class="org.springframework.flex.messaging.MessageTemplate" />
   <!-- Pojo used to start and stop the data feed that pushes data in the 'simple-feed' destination -->
   <bean id="simpleFeedStarter" class="org.springframework.flex.samples.simplefeed.SimpleFeed">
       <constructor-arg ref="defaultMessageTemplate" />
       <flex:remoting-destination />
   </bean>

 

 

 

 

 

具体的业务实现是在　内联线程类FeedThread 里面的run()中实现。

 

这要做的目标是为了让这个线程启动，是一定要通过flex的一个客户端连上来，才能启动。而不能随着spring context启动而启动。否则会报告messageBroke没有设置在flexContext之类的错误。

 

那么：如果我们想后台在没有任何一个客户端连上来的情况下，也要启动这个发送服务应该如何做？

典型场景： 后台web应用启动，并且定义了一个定时器。每隔 5s 进行一个逻辑处理，然后把处理结果发送给前台 flex（无论是否有felx客户端连上）

 

这就需要用下面代码：

 

public String work2(){
        if (logger.isDebugEnabled()) {
            logger.debug("work2() - start"); //$NON-NLS-1$
        }
        String m_rtn  ="Spring 的TestJob任务work2被调用！" ;

        String returnString =new Date().toLocaleString()+ m_rtn;
        //------------------------------------------
         MessageBroker msgBroker = MessageBroker.getMessageBroker("_messageBroker");
         AsyncMessage am = new AsyncMessage();
         am.setDestination("testJob-feed");
         //am.setHeader("DSSubtopic", "tick");
         am.setClientId(UUID.randomUUID().toString());
         String msgID =UUID.randomUUID().toString();
         //System.out.println("MESSAGE ID:" + msgID);
         am.setMessageId(msgID);
         am.setTimestamp(System.currentTimeMillis());
         am.setBody(returnString);
         if (msgBroker != null)
         {
             msgBroker.routeMessageToService(am, null);
         }
         //------------------------------------------

        if (logger.isDebugEnabled()) {
            logger.debug("work2() - end"); //$NON-NLS-1$
        }
        return returnString;
    }

 

 

这个work2 方法可以通过 quartz或者spring 的@Scheduled注解来进行定时器调用。

主要的关键代码是 

 MessageBroker msgBroker = MessageBroker.getMessageBroker("_messageBroker");  

 

这个就是获得一个 _messageBroker的实例。"_messageBroker"字符串是由 <flex:message-broker > 标签中的id来指定。

如果没有id 指定，则缺省使用 “"_messageBroker"”这个字符串

 

 

7.前台的订阅flex程序：

 

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx">

    <fx:Script>
        <!--[CDATA[
            import mx.controls.Alert;
            import mx.messaging.messages.IMessage;

            private function messageHandler(message:IMessage):void
            {
                pushedValue.text = ""+ message.body;
            }

            private function messageHandler1(message:IMessage):void
            {
                pushedValue1.text = ""+ message.body;
            }

        ]]-->
    </fx:Script>

    <fx:Declarations>
        <s:ChannelSet id="cs">
            <s:StreamingAMFChannel uri="/Aerie/messagebroker/streamingamf"/>
            <s:AMFChannel uri="/Aerie/messagebroker/amflongpolling"/>
            <s:AMFChannel uri="/Aerie/messagebroker/amfpolling"/>
        </s:ChannelSet>

        <mx:Consumer id="consumer" destination="simple-feed" channelSet="{cs}"
                     message="messageHandler(event.message)"/>
        <mx:Consumer id="consumer1" destination="testJob-feed" channelSet="{cs}"
                     message="messageHandler1(event.message)"/>
    </fx:Declarations>
    <s:HGroup>
        <s:Group>
            <s:TextInput id="pushedValue" width="250" verticalCenter="0" horizontalCenter="0"/>
            <s:Button label="spimle-feed 订阅" click="consumer.subscribe()" enabled="{!consumer.subscribed}" verticalCenter="30" horizontalCenter="-50"/>
            <s:Button label="Unsubscribe" click="consumer.unsubscribe()" enabled="{consumer.subscribed}" verticalCenter="30" horizontalCenter="50"/>
        </s:Group>
        <s:Group>
            <s:TextInput id="pushedValue1" width="250" verticalCenter="0" horizontalCenter="0"/>
            <s:Button label="testJob 订阅" click="consumer1.subscribe()" enabled="{!consumer1.subscribed}" verticalCenter="30" horizontalCenter="-50"/>
            <s:Button label="Unsubscribe" click="consumer1.unsubscribe()" enabled="{consumer1.subscribed}" verticalCenter="30" horizontalCenter="50"/>
        </s:Group>

    </s:HGroup>



</s:Application>

 

 

其中关键代码是：

 

<fx:Declarations>
        <s:ChannelSet id="cs">
            <s:StreamingAMFChannel uri="/Aerie/messagebroker/streamingamf"/>
            <s:AMFChannel uri="/Aerie/messagebroker/amflongpolling"/>
            <s:AMFChannel uri="/Aerie/messagebroker/amfpolling"/>
        </s:ChannelSet>

        <mx:Consumer id="consumer" destination="simple-feed" channelSet="{cs}"
                     message="messageHandler(event.message)"/>
        <mx:Consumer id="consumer1" destination="testJob-feed" channelSet="{cs}"
                     message="messageHandler1(event.message)"/>
    </fx:Declarations>

 

 

注意：

<s:StreamingAMFChannel uri="/Aerie/messagebroker/streamingamf"/>

<s:AMFChannel uri="/Aerie/messagebroker/amflongpolling"/>

<s:AMFChannel uri="/Aerie/messagebroker/amfpolling"/>

这三个通道的设置中用到的

 Aerie是代表context名字。

messagebroker 是代码 web.xml中的配置的MessagebrokerServlet中的url-pattern

amfpolling 等是指 在services-config.xml文件中设置的 channel-definition 下的endpoint 名字