AmazonSQS and Spring for messaging queue

The next post will demonstrate how to use Spring JMS templates and DLMC’S together with AmazonSQS API in order to place message queue.

Why would I use Amazon SQS?

1. Easy to configure
2. Cross-platfom support
3. Earn from your self redundant, conjunction and scaling worries.

 
 
 
 
Why I wouldn’t use Amazon SQS?

1. If the latency requirement demands less than  ~20 MS
2. Costs ~0.00005$ per message

I came across a nice open source project called: Nevado which wrapping the Amazon SQS API in a very neat way.

Add this to your maven dependency:

<dependency>
 <groupId>org.skyscreamer</groupId>
 <artifactId>nevado-jms</artifactId>
 <version>1.2.4</version>
 </dependency>

Now let’s configure Spring beans to integrate nicely with AmazonSQS:

1. Connection factory:

<bean id="sqsConnectorFactory" class="org.skyscreamer.nevado.jms.connector.amazonaws.AmazonAwsSQSConnectorFactory"/>

Pay attention that within this wrapper we need to set aws.accessKey and aws.secretKey. We get those keys from AmazonSQS account portal:

<bean id="connectionFactory" class="org.skyscreamer.nevado.jms.NevadoConnectionFactory">
 <property name="sqsConnectorFactory" ref="sqsConnectorFactory"/>
 <property name="awsAccessKey" value="${aws.accessKey}"/>
 <property name="awsSecretKey" value="${aws.secretKey}"/>

</bean>

2. Create the queue

<bean id="myQueue" class="org.skyscreamer.nevado.jms.destination.NevadoQueue">
 <constructor-arg value="${aws.sqs.queue.name}"/>
 </bean>

3. Create Jms template (which will be injected later in the code to send messages):

<bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
 <property name="defaultDestinationName" value="${aws.sqs.queue.name}"/>
 <property name="connectionFactory" ref="cachedConnectionFactory"/>
 </bean>

4. Add listeners:

• 4.a I am using SimpleMessageListenerContainer which has the ability to cache connections, run concurrent consumers, set error listeners and more.

  <bean id="simpleMessageListenerContainer" class="org.springframework.jms.listener.SimpleMessageListenerContainer">
   <property name="connectionFactory" ref="connectionFactory"/>
   <property name="messageListener" ref="listener"/>
   <property name="destination" ref="myQueue"/>
   <property name="errorHandler" ref="amazonMessageListener"/>
   <property name="concurrency" value="20"/>
   <property name="taskExecutor" ref="listenerThreadPoolTaskExecutor"/>
   </bean>

• 4.b Let’s add Thread pool for the listener’s executors:

  <bean id="listenerThreadPoolTaskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
   <property name="corePoolSize" value="70"/>
   <property name="maxPoolSize" value="70"/>
   <property name="daemon" value="true"/>
   <property name="keepAliveSeconds" value="60"/>
   </bean>

• 4.c Add Caching connections support:

  <bean id="cachedConnectionFactory" class="org.springframework.jms.connection.CachingConnectionFactory">
   <property name="targetConnectionFactory" ref="connectionFactory"/>
   <property name="sessionCacheSize" value="10"/>
   </bean>

• 4.d Create MessageAdapter to hook everything up and to set pojo as our message listener(amazonMessageListener):

  <bean id="listener" class="org.springframework.jms.listener.adapter.MessageListenerAdapter">
   <property name="delegate" ref="amazonMessageListener"/>
   <property name="defaultListenerMethod" value="onMessage"/>
   <property name="defaultResponseDestination" ref="myQueue"/>
   </bean>

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