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Patch applied for: https://issues.apache.org/activemq/browse/AMQ-1208 

Test case added

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@548300 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Adrian T. Co 2007-06-18 10:48:41 +00:00
parent fae5c5fd29
commit 34a8028770
2 changed files with 135 additions and 31 deletions
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110
activemq-optional/src/main/java/org/apache/activemq/util/xstream/XStreamMessageTransformer.java
View File

@ -36,40 +36,47 @@ import java.io.StringReader;
import java.io.StringWriter;
/**
* Transforms object messages to text messages using {@link XStream}
* Transforms object messages to text messages and vice versa using {@link XStream}
*
* @version $Revision$
*/
public class XStreamMessageTransformer extends MessageTransformerSupport {
private XStream xStream;
/**
* Defines the direction in which transformation goes.
* If 'false' (default),
* - producer transformation transforms from Object to XML.
* - consumer transformation transforms from XML to Object.
* If 'true' transformation directions changes,
* - producer transformation transforms from XML to Object.
* - consumer transformation transforms from Object to XML.
*/
private boolean reverse;
public Message producerTransform(Session session, MessageProducer producer, Message message) throws JMSException {
if (message instanceof ObjectMessage) {
TextMessage answer = session.createTextMessage(marshall(session, producer, (ObjectMessage) message));
copyProperties(message, answer);
return answer;
}
return message;
}
public XStreamMessageTransformer() {
new XStreamMessageTransformer(false);
}
public XStreamMessageTransformer(boolean direction) {
this.reverse = direction;
}
public Message consumerTransform(Session session, MessageConsumer consumer, Message message) throws JMSException {
if (message instanceof TextMessage) {
TextMessage textMessage = (TextMessage) message;
Object object = unmarshall(session, consumer, textMessage);
if (object instanceof Serializable) {
ObjectMessage answer = session.createObjectMessage((Serializable) object);
copyProperties(message, answer);
return answer;
}
else {
throw new JMSException("Object is not serializable: " + object);
}
}
return message;
}
if (reverse) {
return objectToText(session, message);
} else {
return textToObject(session, message);
}
}
public Message producerTransform(Session session, MessageProducer producer, Message message) throws JMSException {
if (reverse) {
return textToObject(session, message);
} else {
return objectToText(session, message);
}
}
// Properties
// -------------------------------------------------------------------------
@ -90,10 +97,58 @@ public class XStreamMessageTransformer extends MessageTransformerSupport {
return new XStream();
}
public boolean isReverse() {
return reverse;
}
public void setReverse(boolean reverse) {
this.reverse = reverse;
}
/**
* Transforms an incoming XML encoded {@link TextMessage} to an {@link ObjectMessage}
* @param session - JMS session currently being used
* @param message - if this is a TextMessage, it will be transformed to an ObjectMessage
* @return ObjectMessage, if the incoming message is a TextMessage, the original message otherwise
* @throws JMSException
*/
protected Message textToObject(Session session, Message message) throws JMSException {
if (message instanceof TextMessage) {
TextMessage textMessage = (TextMessage) message;
Object object = unmarshall(session, textMessage);
if (object instanceof Serializable) {
ObjectMessage answer = session.createObjectMessage((Serializable) object);
copyProperties(message, answer);
return answer;
}
else {
throw new JMSException("Object is not serializable: " + object);
}
}
return message;
}
/**
* Transforms an incoming {@link ObjectMessage} to an XML encoded {@link TextMessage}
* @param session - JMS session currently being used
* @param message - if this is an ObjectMessage, it will be transformed to a TextMessage
* @return XML encoded TextMessage, if the incoming messsage is an ObjectMessge, the original message otherwise
* @throws JMSException
*/
protected Message objectToText(Session session, Message message) throws JMSException {
if (message instanceof ObjectMessage) {
TextMessage answer = session.createTextMessage(marshall(session, (ObjectMessage) message));
copyProperties(message, answer);
return answer;
}
return message;
}
/**
* Marshalls the Object in the {@link ObjectMessage} to a string using XML encoding
*/
protected String marshall(Session session, MessageProducer producer, ObjectMessage objectMessage) throws JMSException {
protected String marshall(Session session, ObjectMessage objectMessage) throws JMSException {
Serializable object = objectMessage.getObject();
StringWriter buffer = new StringWriter();
HierarchicalStreamWriter out = new PrettyPrintWriter(buffer);
@ -101,10 +156,11 @@ public class XStreamMessageTransformer extends MessageTransformerSupport {
return buffer.toString();
}
/**
* Unmarshalls the Object using XML encoding of the String
/**
* Unmarshalls the XML encoded message in the {@link TextMessage} to an Object
*/
protected Object unmarshall(Session session, MessageConsumer consumer, TextMessage textMessage) throws JMSException {
protected Object unmarshall(Session session, TextMessage textMessage) throws JMSException {
HierarchicalStreamReader in = new XppReader(new StringReader(textMessage.getText()));
return getXStream().unmarshal(in);
}

56
activemq-optional/src/test/java/org/apache/activemq/util/xstream/XStreamTransformTest.java
View File

@ -40,6 +40,10 @@ public class XStreamTransformTest extends TestCase {
protected long timeout = 5000;
public void testSendObjectMessageReceiveAsTextMessageAndObjectMessage() throws Exception {
connectionFactory.setTransformer(new XStreamMessageTransformer());
connection = connectionFactory.createConnection();
connection.start();
// lets create the consumers
Session objectSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination destination = objectSession.createTopic(getClass().getName());
@ -82,13 +86,57 @@ public class XStreamTransformTest extends TestCase {
System.out.println(text);
}
protected void setUp() throws Exception {
connectionFactory.setTransformer(new XStreamMessageTransformer());
public void testSendTextMessageReceiveAsObjectMessageAndTextMessage() throws Exception {
// Set reverse to true
connectionFactory.setTransformer(new XStreamMessageTransformer(true));
connection = connectionFactory.createConnection();
connection.start();
}
// lets create the consumers
Session textSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination destination = textSession.createTopic(getClass().getName());
MessageConsumer textConsumer = textSession.createConsumer(destination);
Session objectSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageConsumer objectConsumer = objectSession.createConsumer(destination);
// lets clear the transformer on this consumer so we see the message as it really is
((ActiveMQMessageConsumer) objectConsumer).setTransformer(null);
// send a message
Session producerSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = producerSession.createProducer(destination);
String xmlText =
"<org.apache.activemq.util.xstream.SamplePojo>" +
"<name>James</name>" +
"<city>London</city>" +
"</org.apache.activemq.util.xstream.SamplePojo>";
TextMessage request = producerSession.createTextMessage(xmlText);
producer.send(request);
Message message;
// lets consume it as a text message
message = textConsumer.receive(timeout);
assertNotNull("Should have received a message!", message);
assertTrue("Should be a TextMessage but was: " + message, message instanceof TextMessage);
TextMessage textMessage = (TextMessage) message;
String text = textMessage.getText();
assertTrue("Text should be non-empty!", text != null && text.length() > 0);
// lets consume it as an object message
message = objectConsumer.receive(timeout);
assertNotNull("Should have received a message!", message);
assertTrue("Should be an ObjectMessage but was: " + message, message instanceof ObjectMessage);
ObjectMessage objectMessage = (ObjectMessage) message;
Object object = objectMessage.getObject();
assertTrue("object payload of wrong type: " + object, object instanceof SamplePojo);
SamplePojo body = (SamplePojo) object;
assertEquals("name", "James", body.getName());
assertEquals("city", "London", body.getCity());
}
protected void tearDown() throws Exception {
if (connection != null) {