配置CloudAMQP连接

Question

我在已部署的grails应用程序中配置到CloudAMQP的连接时遇到了困难。我可以在本地安装的RabbitMQ实例上本地运行该应用程序，但是不知道如何正确地定义我的应用程序，以便使用CloudAMQP服务在CloudBees上运行。

在我的Config.groovy中，我定义了我的连接信息和队列：

rabbitmq {
    connectionfactory {
        username = 'USERNAME'
        password = 'PASSWORD'
        hostname = 'lemur.cloudamqp.com'
    }

    queues = {
        testQueue autoDelete: false, durable: false, exclusive: false
    }
}

当应用程序启动并尝试连接时，我看到以下日志消息：

2013-08-23 21:29:59,195 [main] DEBUG listener.SimpleMessageListenerContainer  - Starting Rabbit listener container.
2013-08-23 21:29:59,205 [SimpleAsyncTaskExecutor-1] DEBUG listener.BlockingQueueConsumer  - Starting consumer Consumer: tag=[null], channel=null, acknowledgeMode=AUTO local queue size=0
2013-08-23 21:30:08,405 [SimpleAsyncTaskExecutor-1] WARN  listener.SimpleMessageListenerContainer  - Consumer raised exception, processing can restart if the connection factory supports it
org.springframework.amqp.AmqpIOException: java.io.IOException
    at org.springframework.amqp.rabbit.connection.RabbitUtils.convertRabbitAccessException(RabbitUtils.java:112)
    at org.springframework.amqp.rabbit.connection.AbstractConnectionFactory.createBareConnection(AbstractConnectionFactory.java:163)
    at org.springframework.amqp.rabbit.connection.CachingConnectionFactory.createConnection(CachingConnectionFactory.java:228)
    at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils$1.createConnection(ConnectionFactoryUtils.java:119)
    at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.doGetTransactionalResourceHolder(ConnectionFactoryUtils.java:163)
    at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.getTransactionalResourceHolder(ConnectionFactoryUtils.java:109)
    at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:199)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:524)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException
    at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:106)
    at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:102)
    at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:124)
    at com.rabbitmq.client.impl.AMQConnection.start(AMQConnection.java:381)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:516)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:545)
Caused by: com.rabbitmq.client.ShutdownSignalException: connection error; reason: java.net.SocketException: Connection reset
    at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:67)
    at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:33)
    at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:343)
    at com.rabbitmq.client.impl.AMQChannel.privateRpc(AMQChannel.java:216)
    at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:118)
    ... 3 more
Caused by: java.net.SocketException: Connection reset
    at com.rabbitmq.client.impl.Frame.readFrom(Frame.java:95)
    at com.rabbitmq.client.impl.SocketFrameHandler.readFrame(SocketFrameHandler.java:131)
    at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:508)
2013-08-23 21:30:08,406 [SimpleAsyncTaskExecutor-1] INFO  listener.SimpleMessageListenerContainer  - Restarting Consumer: tag=[null], channel=null, acknowledgeMode=AUTO local queue size=0
2013-08-23 21:30:08,406 [SimpleAsyncTaskExecutor-1] DEBUG listener.BlockingQueueConsumer  - Closing Rabbit Channel: null
2013-08-23 21:30:08,407 [SimpleAsyncTaskExecutor-2] DEBUG listener.BlockingQueueConsumer  - Starting consumer Consumer: tag=[null], channel=null, acknowledgeMode=AUTO local queue size=0
Aug 23, 2013 9:30:11 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'grails'
Aug 23, 2013 9:30:11 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8634
Aug 23, 2013 9:30:11 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8634

Answer 1

根据https://developer.cloudbees.com/bin/view/RUN/CloudAMQP的说法

当您将CloudAMQP服务绑定到应用程序时- CLOUDAMQP_URL_模式中提供了一些配置参数-这是您需要放入配置文件中的类型，以便在应用程序启动时可以连接到它们。

Answer 2

确保为CloudAMQP连接指定virtualHost。这对我很管用。