Http://www.onjava.com/lpt/a/6490
This article describes how Spring simplifies asynchronous message calls. It uses a loan example to explain how Spring reduces
The amount in development.
The following is the amount of code required by traditional development.
public void sendMessage() { queueName = "queue/CreditRequestSendQueue"; System.out.println("Queue name is " + queueName); /* * Create JNDI Initial Context */ try { Hashtable env = new Hashtable(); env.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory"); env.put("java.naming.provider.url","localhost"); env.put("java.naming.factory.url.pkgs", "org.jnp.interfaces:org.jboss.naming"); jndiContext = new InitialContext(env); } catch (NamingException e) { System.out.println("Could not create JNDI API " + "context: " + e.toString()); } /* * Get queue connection factory and queue objects from JNDI context. */ try { queueConnectionFactory = (QueueConnectionFactory) jndiContext.lookup("UIL2ConnectionFactory"); queue = (Queue) jndiContext.lookup(queueName); } catch (NamingException e) { System.out.println("JNDI API lookup failed: " + e.toString()); } /* * Create connection, session, sender objects. * Send the message. * Cleanup JMS connection. */ try { queueConnection = queueConnectionFactory.createQueueConnection(); queueSession = queueConnection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE); queueSender = queueSession.createSender(queue); message = queueSession.createTextMessage(); message.setText("This is a sample JMS message."); System.out.println("Sending message: " + message.getText()); queueSender.send(message); } catch (JMSException e) { System.out.println("Exception occurred: " + e.toString()); } finally { if (queueConnection != null) { try { queueConnection.close(); } catch (JMSException e) {} } }}
Then the Spring code
public void send() { try { ClassPathXmlApplicationContext appContext = new
ClassPathXmlApplicationContext(new String[] { "spring-jms.xml"}); System.out.println("Classpath loaded"); JMSSender jmsSender = (JMSSender)appContext.getBean("jmsSender"); jmsSender.sendMesage(); System.out.println("Message sent using Spring JMS."); } catch(Exception e) { e.printStackTrace(); }}
On the surface, Spring wins, and the code is much less, but let's take a look at the XML configuration of Spring.
org.jnp.interfaces.NamingContextFactory
localhost
org.jnp.interfaces:org.jboss.naming
UIL2ConnectionFactory
queue/CreditRequestSendQueue
queue/CreditReqeustReceiveQueue
30000
We began to recognize the true face of Spring. The configuration with no headers is a nightmare of XML. From chaos to chaos.
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