/**
* Extracts the body from the JMS message
*
* @param exchange the exchange
* @param message the message to extract its body
* @return the body, can be <tt>null</tt>
*/
public Object extractBodyFromJms(Exchange exchange, Message message) {
try {
// is a custom message converter configured on endpoint then use it instead of doing the
// extraction
// based on message type
if (endpoint != null && endpoint.getMessageConverter() != null) {
if (LOG.isTraceEnabled()) {
LOG.trace(
"Extracting body using a custom MessageConverter: {} from JMS message: {}",
endpoint.getMessageConverter(),
message);
}
return endpoint.getMessageConverter().fromMessage(message);
}
// if we are configured to not map the jms message then return it as body
if (endpoint != null && !endpoint.getConfiguration().isMapJmsMessage()) {
LOG.trace("Option map JMS message is false so using JMS message as body: {}", message);
return message;
}
if (message instanceof ObjectMessage) {
LOG.trace("Extracting body as a ObjectMessage from JMS message: {}", message);
ObjectMessage objectMessage = (ObjectMessage) message;
Object payload = objectMessage.getObject();
if (payload instanceof DefaultExchangeHolder) {
DefaultExchangeHolder holder = (DefaultExchangeHolder) payload;
DefaultExchangeHolder.unmarshal(exchange, holder);
return exchange.getIn().getBody();
} else {
return objectMessage.getObject();
}
} else if (message instanceof TextMessage) {
LOG.trace("Extracting body as a TextMessage from JMS message: {}", message);
TextMessage textMessage = (TextMessage) message;
return textMessage.getText();
} else if (message instanceof MapMessage) {
LOG.trace("Extracting body as a MapMessage from JMS message: {}", message);
return createMapFromMapMessage((MapMessage) message);
} else if (message instanceof BytesMessage) {
LOG.trace("Extracting body as a BytesMessage from JMS message: {}", message);
return createByteArrayFromBytesMessage((BytesMessage) message);
} else if (message instanceof StreamMessage) {
LOG.trace("Extracting body as a StreamMessage from JMS message: {}", message);
return message;
} else {
return null;
}
} catch (JMSException e) {
throw new RuntimeCamelException(
"Failed to extract body due to: " + e + ". Message: " + message, e);
}
}
protected Message createJmsMessage(
Exchange exchange,
Object body,
Map<String, Object> headers,
Session session,
CamelContext context)
throws JMSException {
JmsMessageType type = null;
// special for transferExchange
if (endpoint != null && endpoint.isTransferExchange()) {
LOG.trace("Option transferExchange=true so we use JmsMessageType: Object");
Serializable holder = DefaultExchangeHolder.marshal(exchange);
Message answer = session.createObjectMessage(holder);
// ensure default delivery mode is used by default
answer.setJMSDeliveryMode(Message.DEFAULT_DELIVERY_MODE);
return answer;
}
// use a custom message converter
if (endpoint != null && endpoint.getMessageConverter() != null) {
if (LOG.isTraceEnabled()) {
LOG.trace(
"Creating JmsMessage using a custom MessageConverter: {} with body: {}",
endpoint.getMessageConverter(),
body);
}
return endpoint.getMessageConverter().toMessage(body, session);
}
// check if header have a type set, if so we force to use it
if (headers.containsKey(JmsConstants.JMS_MESSAGE_TYPE)) {
type =
context
.getTypeConverter()
.convertTo(JmsMessageType.class, headers.get(JmsConstants.JMS_MESSAGE_TYPE));
} else if (endpoint != null && endpoint.getConfiguration().getJmsMessageType() != null) {
// force a specific type from the endpoint configuration
type = endpoint.getConfiguration().getJmsMessageType();
} else {
type = getJMSMessageTypeForBody(exchange, body, headers, session, context);
}
// create the JmsMessage based on the type
if (type != null) {
if (body == null && (endpoint != null && !endpoint.getConfiguration().isAllowNullBody())) {
throw new JMSException(
"Cannot send message as message body is null, and option allowNullBody is false.");
}
LOG.trace("Using JmsMessageType: {}", type);
Message answer = createJmsMessageForType(exchange, body, headers, session, context, type);
// ensure default delivery mode is used by default
answer.setJMSDeliveryMode(Message.DEFAULT_DELIVERY_MODE);
return answer;
}
// check for null body
if (body == null && (endpoint != null && !endpoint.getConfiguration().isAllowNullBody())) {
throw new JMSException(
"Cannot send message as message body is null, and option allowNullBody is false.");
}
// warn if the body could not be mapped
if (body != null && LOG.isWarnEnabled()) {
LOG.warn(
"Cannot determine specific JmsMessage type to use from body class."
+ " Will use generic JmsMessage."
+ " Body class: "
+ ObjectHelper.classCanonicalName(body)
+ ". If you want to send a POJO then your class might need to implement java.io.Serializable"
+ ", or you can force a specific type by setting the jmsMessageType option on the JMS endpoint.");
}
// return a default message
Message answer = session.createMessage();
// ensure default delivery mode is used by default
answer.setJMSDeliveryMode(Message.DEFAULT_DELIVERY_MODE);
return answer;
}
