ActiveMQ使用总结

本文只针对ActiveMQ常见的一些问题进行介绍。关于如下下载、编译、部署、使用等基本应用不在本文范围内。

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1、ActiveMQ支持消息过滤设置规则和用法

selector支持下列几种方式：

(1) String literals: "color ='blue'"

(2) Byte strings: “myBytes <> "0X0AFC23"”

(3) Numeric values: "NoltemsInStock > 20"

(4) Boolean literals TRUE or FALSE: "AcctDetails=TRUE"

(5) Composite expressions: "Type='car' AND (color = 'blue' OR color ='green') AND weight> 2500"

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使用方式:

（1）创建生产者在send函数之前添加过滤属性：

<wbr></wbr>message->setStringProperty("Color",pColor);

<wbr><wbr>producer-&gt;send(message);</wbr></wbr>

（2）在创建消费者createConsumer时进行如下设置：

<wbr>std::string MessageFilter="color ='blue'"</wbr>

<wbr>m_pConsumer = m_pSession-&gt;createConsumer(m_pDestination, m_MessageFilter);</wbr>

<wbr>m_pConsumer-&gt;setMessageListener(<span style="color:#00ff">this<span style="color:windowtext">);</span></span></wbr>

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2、错误：Channel was inactive for too long <wbr>（服务器消息较长时间没有消息发送时，客户端会报这个错误）</wbr>

解决方法：在建立连接的Uri中加入： wireFormat.maxInactivityDuration=0

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3、采用failover方式连接导致卡死

解决方法：不采用failover连接

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4、ActiveMQ发送模式

（1）ActiveMQ异步发送，只需新增参数transport.useAsyncSend=true，具体如下:

<wbr><wbr><wbr><wbr><wbr>BrokerUri = "tcp://127.0.0.1:61616?<span style="color:#ff0000">transport.useAsyncSend=true</span>"</wbr></wbr></wbr></wbr></wbr>

（2）ActiveMQ同步发送，只需新增参数transport.useAsyncSend=false，具体如下:

<wbr><wbr><wbr><wbr><wbr>BrokerUri = "tcp://127.0.0.1:61616?<span style="color:#ff0000">transport.useAsyncSend=false</span>"</wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><wbr><wbr><wbr>其实activeMQ在默认情况下就是同步发送，所以在同步发送时可以简写为：</wbr></wbr></wbr></wbr></wbr>

<wbr><wbr><wbr><wbr><wbr><span style="color:#ff0000">BrokerUri = "tcp://127.0.0.1:61616"</span></wbr></wbr></wbr></wbr></wbr>

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5、错误：The Session is closed（网络异常时客户端会报出这个错误）

解决办法：在建立连接的Uri中加入： maxReconnectDelay=10000

maxReconnectDelay 最大重连间隔

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6、ActiveMQ负责均衡

对broker采取了负载均衡和基于共享文件系统的主备配置，这个时候，客户端生产者和消费者的URI中用

failover:(tcp://192.168.1.117:61616,tcp://192.168.1.118:61616,tcp://broker3:61616)

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6、ActiveMQ的ACK设置

根据不同的需要可以将ACK设置为Session::CLIENT_ACKNOWLEDGE 或 <wbr><span style="font-family:'nsimsun'; font-size:9pt">Session::AUTO_ACKNOWLEDGE 默认为<span style="font-family:'nsimsun'; font-size:9pt">Session::AUTO_ACKNOWLEDGE</span></span></wbr> 如：

if( clientAck )

{

session = connection->createSession( Session::CLIENT_ACKNOWLEDGE);

}

else

{

session = connection->createSession( Session::AUTO_ACKNOWLEDGE);

}

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7、ActiveMQ的Topic设置

根据不同的需要可以将Topic设置为Topic或 <wbr><span style="font-family:'nsimsun'; font-size:9pt">Queue默认为<span style="font-family:'nsimsun'; font-size:9pt">Queue</span></span></wbr>如：

if(useTopic)

{

<wbr><wbr>destination = session-&gt;createTopic(destURI);</wbr></wbr>

}

else

{

<wbr><wbr>destination = session-&gt;createQueue(destURI);</wbr></wbr>

}

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8、ActiveMQ的DeliveryMode设置（生产者时设置）

根据不同的需要可以将DeliveryMode设置为DeliveryMode::NON_PERSISTENT或 <wbr><span style="font-family:'nsimsun'; font-size:9pt"><span style="font-family:'nsimsun'; font-size:9pt"><span style="font-family:'nsimsun'; font-size:9pt">DeliveryMode::<span style="font-family:'nsimsun'; font-size:9pt">PERSISTENT</span></span></span>默认为<span style="font-family:'nsimsun'; font-size:9pt"><span style="font-family:'nsimsun'; font-size:9pt"><span style="font-family:'nsimsun'; font-size:9pt">DeliveryMode::NON_PERSISTENT</span></span></span></span></wbr>如：

if(usePersistent)

{

<wbr><wbr><span style="font-family:'nsimsun'; font-size:9pt">producer-&gt;setDeliveryMode( DeliveryMode::PERSISTENT);</span></wbr></wbr>

}

else

{

<wbr><wbr><span style="font-family:'nsimsun'; font-size:9pt">producer-&gt;setDeliveryMode( DeliveryMode::NON_PERSISTENT);</span></wbr></wbr>

}