ActiveMQ設置屬性與啓動參數

Question

有沒有辦法將activemq.xml（如共享存儲）中定義的一些屬性設置爲啓動參數？

<kahaDB directory="${data}/kahadb"/> 

與-Dparam =值運行的amq似乎並沒有工作

Answer 1

我覺得很奇怪，這並不爲你工作，比如我們目前正在使用以下Broker配置

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:amq="http://activemq.apache.org/schema/core" 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.xsd 
    http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> 

    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 
     <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" /> 
     <property name="ignoreResourceNotFound" value="true" /> 
     <property name="ignoreUnresolvablePlaceholders" value="true" /> 
     <property name="locations"> 
      <list> 
       <value>classpath:activemq.properties</value> 
       <value>file:///${user.home}/activemq.properties</value> 
       <value>file:///#{systemProperties['activemq.properties']}</value> 
      </list> 
     </property> 
    </bean> 

    <broker useJmx="${activemq.expose.jmx}" persistent="false" 
     brokerName="${activemq.brokerName}" 
     xmlns="http://activemq.apache.org/schema/core"> 
     <destinationPolicy> 
      <policyMap> 
       <policyEntries> 
        <policyEntry queue=">" enableAudit="false"> 
         <networkBridgeFilterFactory> 
          <conditionalNetworkBridgeFilterFactory replayWhenNoConsumers="true"/> 
         </networkBridgeFilterFactory> 
        </policyEntry> 
       </policyEntries> 
      </policyMap> 
     </destinationPolicy> 
     <systemUsage> 
      <systemUsage> 
       <memoryUsage> 
        <memoryUsage limit="${activemq.memoryUsage}" /> 
       </memoryUsage> 
       <tempUsage> 
        <tempUsage limit="${activemq.tempUsage}" /> 
       </tempUsage> 
      </systemUsage> 
     </systemUsage> 
     <networkConnectors> 
      <networkConnector 
       name="queues" 
       uri="static:(${activemq.otherBrokers})" 
       networkTTL="3" 
       decreaseNetworkConsumerPriority="true" 
       conduitSubscriptions="false" > 
       <excludedDestinations> 
        <topic physicalName=">" /> 
       </excludedDestinations> 
      </networkConnector> 
      <networkConnector 
       name="topics" 
       uri="static:(${activemq.otherBrokers})" 
       networkTTL="3" 
       decreaseNetworkConsumerPriority="true" 
       conduitSubscriptions="true" > 
       <excludedDestinations> 
        <queue physicalName=">" /> 
       </excludedDestinations> 
      </networkConnector> 
     </networkConnectors> 
     <transportConnectors> 
      <!-- expose a TCP transport for clients to use --> 
      <transportConnector 
       uri="${activemq.protocol}${activemq.host}:${activemq.tcp.port}" 
       updateClusterClients="true" 
       rebalanceClusterClients="true" /> 
      <transportConnector 
       uri="${activemq.websocket.protocol}${activemq.websocket.host}:${activemq.websocket.port}" 
       updateClusterClients="true" 
       rebalanceClusterClients="true" /> 
     </transportConnectors> 
    </broker> 
</beans> 

這裏通常是從給定的屬性文件讀取屬性，但是我經常使用直接的-D JMV系統屬性來替代屬性文件中的某些測試，並且從未遇到任何問題。我想你可以嘗試＃{systemProperties ['property.name']}的略複雜的語法來專門設置給定屬性是系統屬性而不是來自佔位符。

最後一點：您使用的是哪個版本的ActiveMQ，以及該版本使用哪個版本的Spring？我認爲整個佔位符語法都是在Spring 3.1的某個地方添加的，所以真的很早以前，但這是我能想象爲什麼這不適合你的唯一原因。