配置

ActiveMQ默认使用的是XML格式配置,从4.0版本开始用MBean的方式实现XML配置,配置文件在${activemq.home}/conf目录下,文件名为activemq.xml。最新的默认配置见
http://svn.apache.org/repos/asf/activemq/trunk/assembly/src/release/conf/activemq.xml 。下面为本篇文章使用的配置,及重要部分的解释。

 

Xml代码 ActiveMQ基本配置 _配置文件

  1. <beans  

  2.   xmlns="http://www.springframework.org/schema/beans"  

  3.   xmlns:amq="http://activemq.org/config/1.0"  

  4.   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-2.0.xsd  

  5.   http://activemq.org/config/1.0 http://activemq.apache.org/schema/activemq-core.xsd  

  6.   http://activemq.apache.org/camel/schema/spring>  

  7.    

  8.   <!-- persistent="true"表示要持久化存储消息,和子元素persistenceAdapter结合使用 -->  

  9.   <!-- dataDirectory默认的存储持久化数据的目录 -->  

  10.   <!-- brokerName 设置broker的name,在注意在网络上必须是唯一的-->  

  11.   <!-- 更多参考http://activemq.apache.org/xbean-xml-reference-50.html#XBeanXMLReference5.0-brokerelement -->  

  12.   <broker xmlns="http://activemq.org/config/1.0" brokerName="192.168.1.148" persistent ="true" dataDirectory="${activemq.base}/data" useShutdownHook="false">  

  13.    

  14.     <!-- Destination specific policies using destination names or wildcards -->  

  15.     <!-- wildcards意义见http://activemq.apache.org/wildcards.html -->  

  16.     <destinationPolicy>  

  17.       <policyMap>  

  18.         <policyEntries>  

  19.        <!-- 这里使用了wildcards,表示所有以EUCITA开头的topic -->  

  20.           <policyEntry topic="EUCITA.>" producerFlowControl="false" memoryLimit="10mb">  

  21.             <!-- 分发策略 -->  

  22.         <dispatchPolicy>  

  23.           <!-- 按顺序分发 -->  

  24.               <strictOrderDispatchPolicy/>  

  25.             </dispatchPolicy>  

  26.         <!--  恢复策略-->  

  27.             <subscriptionRecoveryPolicy>  

  28.           <!-- 只恢复最后一个message -->  

  29.               <lastImageSubscriptionRecoveryPolicy/>  

  30.             </subscriptionRecoveryPolicy>  

  31.           </policyEntry>  

  32.         </policyEntries>  

  33.       </policyMap>  

  34.     </destinationPolicy>  

  35.   

  36.     <!-- The transport connectors ActiveMQ will listen to -->  

  37.     <transportConnectors>  

  38.        <transportConnector name="openwire" uri="tcp://192.168.1.148:61616" discoveryUri="multicast://default"/>  

  39.        <transportConnector name="ssl"     uri="ssl://192.168.1.148:61617"/>  

  40.        <transportConnector name="stomp"   uri="stomp://192.168.1.148:61613"/>  

  41.        <transportConnector name="xmpp"    uri="xmpp://192.168.1.148:61222"/>  

  42.     </transportConnectors>  

  43.      

  44.     <!-- 消息持久化方式 -->  

  45.     <persistenceAdapter>  

  46.       <amqPersistenceAdapter directory="${activemq.base}/data"/>  

  47.     </persistenceAdapter>  

  48. </broker>  

  49.   

  50.   <!-- lets create a command agent to respond to message based admin commands on the ActiveMQ.Agent topic -->  

  51.     <commandAgent xmlns="http://activemq.org/config/1.0"/>  

  52.     

  53.   <!-- An embedded servlet engine for serving up the Admin console -->  

  54.   <jetty xmlns="http://mortbay.com/schemas/jetty/1.0">  

  55.     <connectors>  

  56.       <nioConnector port="8161" />  

  57.     </connectors>  

  58.   

  59.     <handlers>  

  60.       <webAppContext contextPath="/admin" resourceBase="${activemq.base}/webapps/admin" logUrlOnStart="true" />       

  61.       <webAppContext contextPath="/demo" resourceBase="${activemq.base}/webapps/demo" logUrlOnStart="true" />         

  62.     </handlers>  

  63.   </jetty>   

  64. </beans>  

 

注释

关于XML配置中元素的具体信息可以参考http://activemq.apache.org/xbean-xml-reference-50.html 下面介绍本篇配置使用的一些重要元素。

DispathPolicy

ActiveMQ支持3中不同的分发策略(避免翻译了以后误解,这里用原文):

  1. <roundRobinDispatchPolicy>:Simple dispatch policy that sends a message to every subscription that matches the message.

  2. <simpleDispatchPolicy>:Simple dispatch policy that sends a message to every subscription that matches the message.

  3. <strictOrderDispatchPolicy>:Dispatch policy that causes every subscription to see messages in the same order.

SubscriptionRecoveryPolicy

ActiveMQ支持6种恢复策略,可以自行选择使用不同的策略

  1. <fixedCountSubscriptionRecoveryPolicy>: keep a fixed count of last messages.

  2. <fixedSizedSubscriptionRecoveryPolicy>: keep a fixed amount of memory available in RAM for message history which is evicted in time order.

  3. <lastImageSubscriptionRecoveryPolicy>:only keep the last message.

  4. <noSubscriptionRecoveryPolicy>:disable recovery of messages.

  5. <queryBasedSubscriptionRecoveryPolicy>:perform a user specific query mechanism to load any messages they may have missed.

  6. <timedSubscriptionRecoveryPolicy>:keep a timed buffer of messages around in memory and use that to recover new subscriptions.

PersistenceAdapter

http://activemq.apache.org/persistence 讲解了关于persistence的信息。ActiveMQ5.0使用AMQ Message Store 持久化消息,这种方式提供了很好的性能(The AMQ Message Store is an embeddable transactional message storage solution that is extremely fast and reliable.)默认使用该存储方式即可,如果想使用JDBC来存储,可以查找文档配置。