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A pure Java JMS Camel Component
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.component.sjms.jms;
import java.io.File;
import java.io.InputStream;
import java.io.Reader;
import java.io.Serializable;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import jakarta.jms.BytesMessage;
import jakarta.jms.Destination;
import jakarta.jms.JMSException;
import jakarta.jms.MapMessage;
import jakarta.jms.Message;
import jakarta.jms.MessageFormatException;
import jakarta.jms.ObjectMessage;
import jakarta.jms.Session;
import jakarta.jms.StreamMessage;
import jakarta.jms.TextMessage;
import org.w3c.dom.Node;
import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.NoTypeConversionAvailableException;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.StreamCache;
import org.apache.camel.WrappedFile;
import org.apache.camel.spi.HeaderFilterStrategy;
import org.apache.camel.support.CamelContextHelper;
import org.apache.camel.support.DefaultExchangeHolder;
import org.apache.camel.support.ExchangeHelper;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.camel.component.sjms.jms.JmsMessageHelper.normalizeDestinationName;
/**
* A Strategy used to convert between a Camel {@link org.apache.camel.Exchange} and {@link org.apache.camel.Message} to
* and from a JMS {@link jakarta.jms.Message}
*/
public class JmsBinding {
private static final Logger LOG = LoggerFactory.getLogger(JmsBinding.class);
private final boolean mapJmsMessage;
private final boolean allowNullBody;
private final HeaderFilterStrategy headerFilterStrategy;
private final JmsKeyFormatStrategy jmsJmsKeyFormatStrategy;
private final MessageCreatedStrategy messageCreatedStrategy;
public JmsBinding(boolean mapJmsMessage, boolean allowNullBody,
HeaderFilterStrategy headerFilterStrategy, JmsKeyFormatStrategy jmsJmsKeyFormatStrategy,
MessageCreatedStrategy messageCreatedStrategy) {
this.mapJmsMessage = mapJmsMessage;
this.allowNullBody = allowNullBody;
this.headerFilterStrategy = headerFilterStrategy;
this.jmsJmsKeyFormatStrategy = jmsJmsKeyFormatStrategy;
this.messageCreatedStrategy = messageCreatedStrategy;
}
/**
* Extracts the body from the JMS message
*
* @param exchange the exchange
* @param message the message to extract its body
* @return the body, can be null
*/
public Object extractBodyFromJms(Exchange exchange, Message message) {
try {
// if we are configured to not map the jms message then return it as body
if (!mapJmsMessage) {
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);
}
}
public Map extractHeadersFromJms(Message jmsMessage, Exchange exchange) {
Map map = new HashMap<>();
if (jmsMessage != null) {
// lets populate the standard JMS message headers
try {
map.put(JmsConstants.JMS_CORRELATION_ID, jmsMessage.getJMSCorrelationID());
map.put("JMSCorrelationIDAsBytes", JmsMessageHelper.getJMSCorrelationIDAsBytes(jmsMessage));
map.put("JMSDeliveryMode", jmsMessage.getJMSDeliveryMode());
map.put("JMSDestination", jmsMessage.getJMSDestination());
map.put("JMSExpiration", jmsMessage.getJMSExpiration());
map.put("JMSMessageID", jmsMessage.getJMSMessageID());
map.put("JMSPriority", jmsMessage.getJMSPriority());
map.put("JMSRedelivered", jmsMessage.getJMSRedelivered());
map.put("JMSTimestamp", jmsMessage.getJMSTimestamp());
map.put(JmsConstants.JMS_REPLY_TO, JmsMessageHelper.getJMSReplyTo(jmsMessage));
map.put("JMSType", JmsMessageHelper.getJMSType(jmsMessage));
// this works around a bug in the ActiveMQ property handling
map.put(JmsConstants.JMSX_GROUP_ID, JmsMessageHelper.getStringProperty(jmsMessage, JmsConstants.JMSX_GROUP_ID));
map.put("JMSXUserID", JmsMessageHelper.getStringProperty(jmsMessage, "JMSXUserID"));
} catch (JMSException e) {
throw new RuntimeCamelException(e);
}
Enumeration names;
try {
names = jmsMessage.getPropertyNames();
} catch (JMSException e) {
throw new RuntimeCamelException(e);
}
while (names.hasMoreElements()) {
String name = names.nextElement().toString();
try {
Object value = JmsMessageHelper.getProperty(jmsMessage, name);
if (headerFilterStrategy != null
&& headerFilterStrategy.applyFilterToExternalHeaders(name, value, exchange)) {
continue;
}
// must decode back from safe JMS header name to original header name
// when storing on this Camel JmsMessage object.
String key = jmsJmsKeyFormatStrategy.decodeKey(name);
map.put(key, value);
} catch (JMSException e) {
throw new RuntimeCamelException(name, e);
}
}
}
return map;
}
public Object getObjectProperty(Message jmsMessage, String name) throws JMSException {
// try a direct lookup first
Object answer = jmsMessage.getObjectProperty(name);
if (answer == null) {
// then encode the key and do another lookup
String key = jmsJmsKeyFormatStrategy.encodeKey(name);
answer = jmsMessage.getObjectProperty(key);
}
return answer;
}
protected byte[] createByteArrayFromBytesMessage(BytesMessage message) throws JMSException {
if (message.getBodyLength() > Integer.MAX_VALUE) {
LOG.warn("Length of BytesMessage is too long: {}", message.getBodyLength());
return null;
}
byte[] result = new byte[(int) message.getBodyLength()];
message.readBytes(result);
return result;
}
/**
* Creates a JMS message from the Camel exchange and message
*
* @param exchange the current exchange
* @param camelMessage the body to make a jakarta.jms.Message as
* @param session the JMS session used to create the message
* @param cause optional exception occurred that should be sent as reply instead of a regular body
* @return a newly created JMS Message instance containing the
* @throws JMSException if the message could not be created
*/
public Message makeJmsMessage(Exchange exchange, org.apache.camel.Message camelMessage, Session session, Exception cause)
throws JMSException {
Message answer;
if (cause != null) {
// an exception occurred so send it as response
LOG.debug("Will create JmsMessage with caused exception: {}", cause.getMessage(), cause);
// create jms message containing the caused exception
answer = createJmsMessage(cause, session);
} else {
// create regular jms message using the camel message body
answer = createJmsMessage(exchange, camelMessage.getBody(), camelMessage.getHeaders(), session,
exchange.getContext());
appendJmsProperties(answer, exchange, camelMessage.getHeaders());
}
if (answer != null && messageCreatedStrategy != null) {
messageCreatedStrategy.onMessageCreated(answer, session, exchange, null);
}
return answer;
}
/**
* Appends the JMS headers from the Camel {@link Message}
*/
public void appendJmsProperties(Message jmsMessage, Exchange exchange, Map headers) throws JMSException {
if (headers != null) {
Set> entries = headers.entrySet();
for (Map.Entry entry : entries) {
String headerName = entry.getKey();
Object headerValue = entry.getValue();
appendJmsProperty(jmsMessage, exchange, headerName, headerValue);
}
}
}
public void appendJmsProperty(Message jmsMessage, Exchange exchange, String headerName, Object headerValue)
throws JMSException {
if (isStandardJMSHeader(headerName)) {
if (headerName.equals(JmsConstants.JMS_CORRELATION_ID)) {
jmsMessage.setJMSCorrelationID(ExchangeHelper.convertToType(exchange, String.class, headerValue));
} else if (headerName.equals(JmsConstants.JMS_REPLY_TO) && headerValue != null) {
if (headerValue instanceof String) {
// if the value is a String we must normalize it first, and must include the prefix
// as ActiveMQ requires that when converting the String to a jakarta.jms.Destination type
headerValue = normalizeDestinationName((String) headerValue, true);
}
Destination replyTo = ExchangeHelper.convertToType(exchange, Destination.class, headerValue);
JmsMessageHelper.setJMSReplyTo(jmsMessage, replyTo);
} else if (headerName.equals("JMSType")) {
jmsMessage.setJMSType(ExchangeHelper.convertToType(exchange, String.class, headerValue));
} else if (headerName.equals("JMSPriority")) {
jmsMessage.setJMSPriority(ExchangeHelper.convertToType(exchange, Integer.class, headerValue));
} else if (headerName.equals("JMSDeliveryMode")) {
JmsMessageHelper.setJMSDeliveryMode(exchange, jmsMessage, headerValue);
} else if (headerName.equals("JMSExpiration")) {
jmsMessage.setJMSExpiration(ExchangeHelper.convertToType(exchange, Long.class, headerValue));
} else {
// The following properties are set by the MessageProducer:
// JMSDestination
// The following are set on the underlying JMS provider:
// JMSMessageID, JMSTimestamp, JMSRedelivered
// log at trace level to not spam log
LOG.trace("Ignoring JMS header: {} with value: {}", headerName, headerValue);
}
} else if (shouldOutputHeader(headerName, headerValue, exchange)) {
// only primitive headers and strings is allowed as properties
// see message properties: http://java.sun.com/j2ee/1.4/docs/api/javax/jms/Message.html
Object value = getValidJMSHeaderValue(headerName, headerValue);
if (value != null) {
// must encode to safe JMS header name before setting property on jmsMessage
String key = jmsJmsKeyFormatStrategy.encodeKey(headerName);
// set the property
JmsMessageHelper.setProperty(jmsMessage, key, value);
} else if (LOG.isDebugEnabled()) {
// okay the value is not a primitive or string so we cannot sent it over the wire
LOG.debug("Ignoring non primitive header: {} of class: {} with value: {}",
headerName, headerValue.getClass().getName(), headerValue);
}
}
}
/**
* Is the given header a standard JMS header
*
* @param headerName the header name
* @return true if its a standard JMS header
*/
protected boolean isStandardJMSHeader(String headerName) {
if (!headerName.startsWith("JMS")) {
return false;
}
if (headerName.startsWith("JMSX")) {
return false;
}
// vendors will use JMS_XXX as their special headers (where XXX is vendor name, such as JMS_IBM)
if (headerName.startsWith("JMS_")) {
return false;
}
// the 4th char must be a letter to be a standard JMS header
if (headerName.length() > 3) {
char fourth = headerName.charAt(3);
if (Character.isLetter(fourth)) {
return true;
}
}
return false;
}
/**
* Strategy to test if the given header is valid according to the JMS spec to be set as a property on the JMS
* message.
*
* This default implementation will allow:
*
* - any primitives and their counter Objects (Integer, Double etc.)
* - String and any other literals, Character, CharSequence
* - Boolean
* - Number
* - java.util.Date
*
*
* @param headerName the header name
* @param headerValue the header value
* @return the value to use, null to ignore this header
*/
protected Object getValidJMSHeaderValue(String headerName, Object headerValue) {
if (headerValue instanceof String) {
return headerValue;
} else if (headerValue instanceof BigInteger) {
return headerValue.toString();
} else if (headerValue instanceof BigDecimal) {
return headerValue.toString();
} else if (headerValue instanceof Number) {
return headerValue;
} else if (headerValue instanceof Character) {
return headerValue;
} else if (headerValue instanceof CharSequence) {
return headerValue.toString();
} else if (headerValue instanceof Boolean) {
return headerValue;
} else if (headerValue instanceof Date) {
return headerValue.toString();
}
return null;
}
protected Message createJmsMessage(Exception cause, Session session) throws JMSException {
LOG.trace("Using JmsMessageType: {}", JmsMessageType.Object);
Message answer = session.createObjectMessage(cause);
// ensure default delivery mode is used by default
answer.setJMSDeliveryMode(Message.DEFAULT_DELIVERY_MODE);
return answer;
}
protected Message createJmsMessage(
Exchange exchange, Object body, Map headers, Session session, CamelContext context)
throws JMSException {
JmsMessageType type = getJMSMessageTypeForBody(exchange, body, headers, session, context);
// create the JmsMessage based on the type
if (type != null) {
if (body == null && !allowNullBody) {
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, 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 && !allowNullBody) {
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: {}"
+ ". 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.",
ObjectHelper.classCanonicalName(body));
}
// return a default message
Message answer = session.createMessage();
// ensure default delivery mode is used by default
answer.setJMSDeliveryMode(Message.DEFAULT_DELIVERY_MODE);
return answer;
}
/**
* Return the {@link JmsMessageType}
*
* @return type or null if no mapping was possible
*/
protected JmsMessageType getJMSMessageTypeForBody(
Exchange exchange, Object body, Map headers, Session session, CamelContext context) {
JmsMessageType type = null;
// let body determine the type
if (body instanceof Node || body instanceof String) {
type = JmsMessageType.Text;
} else if (body instanceof byte[] || body instanceof WrappedFile || body instanceof File || body instanceof Reader
|| body instanceof InputStream || body instanceof ByteBuffer || body instanceof StreamCache) {
type = JmsMessageType.Bytes;
} else if (body instanceof Map) {
type = JmsMessageType.Map;
} else if (body instanceof Serializable) {
type = JmsMessageType.Object;
} else if (exchange.getContext().getTypeConverter().tryConvertTo(File.class, body) != null
|| exchange.getContext().getTypeConverter().tryConvertTo(InputStream.class, body) != null) {
type = JmsMessageType.Bytes;
}
return type;
}
/**
*
* Create the {@link Message}
*
* @return jmsMessage or null if the mapping was not successfully
*/
protected Message createJmsMessageForType(
Exchange exchange, Object body, Session session, CamelContext context,
JmsMessageType type)
throws JMSException {
switch (type) {
case Text: {
TextMessage message = session.createTextMessage();
if (body != null) {
String payload = context.getTypeConverter().convertTo(String.class, exchange, body);
message.setText(payload);
}
return message;
}
case Bytes: {
BytesMessage message = session.createBytesMessage();
if (body != null) {
byte[] payload = context.getTypeConverter().convertTo(byte[].class, exchange, body);
message.writeBytes(payload);
}
return message;
}
case Map: {
MapMessage message = session.createMapMessage();
if (body != null) {
Map payload = context.getTypeConverter().convertTo(Map.class, exchange, body);
populateMapMessage(message, payload, context);
}
return message;
}
case Object:
ObjectMessage message = session.createObjectMessage();
if (body != null) {
try {
Serializable payload
= context.getTypeConverter().mandatoryConvertTo(Serializable.class, exchange, body);
message.setObject(payload);
} catch (NoTypeConversionAvailableException e) {
// cannot convert to serializable then thrown an exception to avoid sending a null message
JMSException cause = new MessageFormatException(e.getMessage());
cause.initCause(e);
throw cause;
}
}
return message;
default:
break;
}
return null;
}
/**
* Populates a {@link MapMessage} from a {@link Map} instance.
*/
protected void populateMapMessage(MapMessage message, Map map, CamelContext context)
throws JMSException {
for (Map.Entry entry : map.entrySet()) {
String keyString = CamelContextHelper.convertTo(context, String.class, entry.getKey());
if (keyString != null) {
message.setObject(keyString, entry.getValue());
}
}
}
/**
* Extracts a {@link Map} from a {@link MapMessage}
*/
public Map createMapFromMapMessage(MapMessage message) throws JMSException {
Map answer = new HashMap<>();
Enumeration names = message.getMapNames();
while (names.hasMoreElements()) {
String name = names.nextElement().toString();
Object value = message.getObject(name);
answer.put(name, value);
}
return answer;
}
/**
* Strategy to allow filtering of headers which are put on the JMS message
*
* Note: Currently only supports sending java identifiers as keys
*/
protected boolean shouldOutputHeader(String headerName, Object headerValue, Exchange exchange) {
return headerFilterStrategy == null
|| !headerFilterStrategy.applyFilterToCamelHeaders(headerName, headerValue, exchange);
}
}
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