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Mule Builder for use with Spring 2.X Namespace based XML
configuration.
/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.config.spring;
import org.mule.api.MuleContext;
import org.mule.api.config.ConfigurationException;
import org.mule.api.construct.Pipeline;
import org.mule.api.context.MuleContextFactory;
import org.mule.common.MuleArtifact;
import org.mule.common.MuleArtifactFactoryException;
import org.mule.common.config.XmlConfigurationCallback;
import org.mule.common.config.XmlConfigurationMuleArtifactFactory;
import org.mule.config.ConfigResource;
import org.mule.context.DefaultMuleContextFactory;
import org.mule.util.IOUtils;
import org.mule.util.StringUtils;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Namespace;
import org.dom4j.QName;
import org.dom4j.io.DOMReader;
import org.w3c.dom.Node;
public class SpringXmlConfigurationMuleArtifactFactory implements XmlConfigurationMuleArtifactFactory
{
public static final String BEANS_ELEMENT = "beans";
public static final String REFS_SUFFIX = "-refs";
public static final String REFS_TOKENS = " \t"; // Space, Tab
public static final String REF_SUFFIX = "-ref";
public static final String REF_ATTRIBUTE_NAME = "ref";
public static final String NAME_ATTRIBUTE_NAME = "name";
private Map builders = new HashMap();
private Map contexts = new HashMap();
@Override
public MuleArtifact getArtifact(org.w3c.dom.Element element, XmlConfigurationCallback callback)
throws MuleArtifactFactoryException
{
return doGetArtifact(element, callback, false);
}
@Override
public MuleArtifact getArtifactForMessageProcessor(org.w3c.dom.Element element, XmlConfigurationCallback callback)
throws MuleArtifactFactoryException
{
return doGetArtifact(element, callback, true);
}
protected String getArtifactMuleConfig(String flowName, org.w3c.dom.Element element, final XmlConfigurationCallback callback, boolean embedInFlow) throws MuleArtifactFactoryException
{
Map schemaLocations = new HashMap();
schemaLocations.put("http://www.mulesoft.org/schema/mule/core", "http://www.mulesoft.org/schema/mule/core/current/mule.xsd");
Document document = DocumentHelper.createDocument();
// the rootElement is the root of the document
Element rootElement = document.addElement("mule", "http://www.mulesoft.org/schema/mule/core");
org.w3c.dom.Element[] placeholders = callback.getPropertyPlaceholders();
for (org.w3c.dom.Element placeholder : placeholders)
{
try
{
Element newPlaceholder = convert(placeholder);
rootElement.add(newPlaceholder);
addSchemaLocation(placeholder, callback, schemaLocations);
}
catch (ParserConfigurationException e)
{
throw new MuleArtifactFactoryException("Error parsing XML", e);
}
}
// the parentElement is the parent of the element we are adding
Element parentElement = rootElement;
addSchemaLocation(element, callback, schemaLocations);
if (embedInFlow)
{
// Need to put the message processor in a valid flow. Our default flow is:
// ""
// + " "
parentElement = rootElement.addElement("flow", "http://www.mulesoft.org/schema/mule/core");
parentElement.addAttribute("name", flowName);
}
try
{
parentElement.add(convert(element));
processGlobalReferences(element, callback, rootElement, schemaLocations);
// For message sources to work, the flow should be valid, this means needs to have a MP
if (embedInFlow)
{
parentElement.addElement("logger", "http://www.mulesoft.org/schema/mule/core");
}
setSchemaLocation(rootElement, schemaLocations);
return document.asXML();
}
catch (Throwable t)
{
throw new MuleArtifactFactoryException("Error generating minimal XML configuration.", t);
}
}
private void processGlobalReferences(org.w3c.dom.Element element, XmlConfigurationCallback callback, Element rootElement, Map schemaLocations) throws ParserConfigurationException
{
processGlobalReferencesInAttributes(element, callback, rootElement, schemaLocations);
processGlobalReferencesInChildElements(element, callback, rootElement, schemaLocations);
}
private void processGlobalReferencesInChildElements(org.w3c.dom.Element element, XmlConfigurationCallback callback, Element rootElement, Map schemaLocations) throws ParserConfigurationException
{
if (element != null && element.getChildNodes() != null)
{
// Look for references in first level of child nodes
for (int i = 0; i < element.getChildNodes().getLength(); i++)
{
processGlobalReferencesInAttributes(element.getChildNodes().item(i), callback, rootElement, schemaLocations);
}
}
}
private void processGlobalReferencesInAttributes(Node element, XmlConfigurationCallback callback, Element rootElement, Map schemaLocations) throws ParserConfigurationException
{
if (element != null && element.getAttributes() != null)
{
for (int i = 0; i < element.getAttributes().getLength(); i++)
{
String attributeName = element.getAttributes().item(i).getLocalName();
if (attributeName != null && ((attributeName.endsWith(REF_SUFFIX) || attributeName.equals(REF_ATTRIBUTE_NAME)) || (element.getNodeName().endsWith(REF_SUFFIX) && attributeName.equals(NAME_ATTRIBUTE_NAME))))
{
org.w3c.dom.Element dependentElement = callback.getGlobalElement(element.getAttributes()
.item(i)
.getNodeValue());
addReferencedGlobalElement(callback, rootElement, dependentElement, schemaLocations);
}
else if (attributeName != null && attributeName.endsWith(REFS_SUFFIX))
{
StringTokenizer refs = new StringTokenizer(element.getAttributes().item(i).getNodeValue(), REFS_TOKENS);
while(refs.hasMoreTokens())
{
String referenceName = refs.nextToken();
if (StringUtils.isNotBlank(referenceName))
{
org.w3c.dom.Element dependentElement = callback.getGlobalElement(referenceName);
addReferencedGlobalElement(callback, rootElement, dependentElement, schemaLocations);
}
}
}
}
}
}
private void addReferencedGlobalElement(XmlConfigurationCallback callback, Element rootElement, org.w3c.dom.Element dependentElement, Map schemaLocations) throws ParserConfigurationException
{
if (dependentElement != null)
{
if (isSpringBean(dependentElement))
{
wrapElementInSpringBeanContainer(rootElement, dependentElement);
}
else
{
rootElement.add(convert(dependentElement));
addSchemaLocation(dependentElement, callback, schemaLocations);
}
processGlobalReferences(dependentElement, callback, rootElement, schemaLocations);
}
}
private void wrapElementInSpringBeanContainer(Element rootElement, org.w3c.dom.Element dependentElement) throws ParserConfigurationException
{
String namespaceUri = dependentElement.getNamespaceURI();
Namespace namespace = new Namespace(dependentElement.getPrefix(), namespaceUri);
Element beans = rootElement.element(new QName(BEANS_ELEMENT, namespace));
if (beans == null)
{
beans = rootElement.addElement(BEANS_ELEMENT, namespaceUri);
}
beans.add(convert(dependentElement));
}
private boolean isSpringBean(org.w3c.dom.Element dependentElement)
{
return "http://www.springframework.org/schema/beans".equals(dependentElement.getNamespaceURI());
}
protected MuleArtifact doGetArtifact(org.w3c.dom.Element element, final XmlConfigurationCallback callback, boolean embedInFlow)
throws MuleArtifactFactoryException
{
String flowName = "flow-" + Integer.toString(element.hashCode());
InputStream xmlConfig = IOUtils.toInputStream(getArtifactMuleConfig(flowName, element, callback, embedInFlow));
MuleContext muleContext = null;
SpringXmlConfigurationBuilder builder = null;
Map environmentProperties = callback.getEnvironmentProperties();
Properties systemProperties = System.getProperties();
Map originalSystemProperties = new HashMap(systemProperties);
try
{
ConfigResource config = new ConfigResource("embedded-datasense.xml", xmlConfig);
// This configuration overrides the default-mule-config one to replace beans that are not required
ConfigResource defaultConfigOverride = new ConfigResource(getClass().getClassLoader().getResource("default-mule-config-override.xml").toURI().toURL());
if (environmentProperties != null)
{
systemProperties.putAll(environmentProperties);
}
MuleContextFactory factory = new DefaultMuleContextFactory();
builder = new SpringXmlConfigurationBuilder(new ConfigResource[] {config, defaultConfigOverride});
muleContext = factory.createMuleContext(builder);
muleContext.start();
MuleArtifact artifact = null;
if (embedInFlow)
{
Pipeline pipeline = muleContext.getRegistry().lookupObject(flowName);
if (pipeline.getMessageSource() == null)
{
if (pipeline.getMessageProcessors() != null && pipeline.getMessageProcessors().size() > 0)
{
artifact = new DefaultMuleArtifact(pipeline.getMessageProcessors().get(0));
}
else
{
throw new IllegalArgumentException("artifact is null");
}
}
else
{
artifact = new DefaultMuleArtifact(pipeline.getMessageSource());
}
}
else
{
artifact = new DefaultMuleArtifact(muleContext.getRegistry().lookupObject(element.getAttribute("name")));
}
builders.put(artifact, builder);
contexts.put(artifact, muleContext);
return artifact;
}
catch (ConfigurationException ce)
{
dispose(builder, muleContext);
throw new MuleArtifactFactoryException("There seems to be a problem in your XML configuration. Please fix and retry.", ce);
}
catch (Throwable t)
{
dispose(builder, muleContext);
throw new MuleArtifactFactoryException("Error starting minimal XML configuration.", t);
}
finally
{
systemProperties.clear();
systemProperties.putAll(originalSystemProperties);
IOUtils.closeQuietly(xmlConfig);
}
}
protected void addSchemaLocation(org.w3c.dom.Element element, XmlConfigurationCallback callback,
Map schemaLocations)
{
String key = element.getNamespaceURI();
if (key != null && !schemaLocations.containsKey(key))
{
schemaLocations.put(element.getNamespaceURI(), callback.getSchemaLocation(element.getNamespaceURI()));
}
}
protected void setSchemaLocation(Element rootElement, Map schemaLocations)
{
StringBuilder schemaLocation = new StringBuilder();
for (String key : schemaLocations.keySet())
{
schemaLocation.append(key + " " + schemaLocations.get(key) + "\n");
}
rootElement.addAttribute(
org.dom4j.QName.get("schemaLocation", "xsi", "http://www.w3.org/2001/XMLSchema-instance"),
schemaLocation.toString().trim());
}
/**
* Convert w3c element to dom4j element
*
* @throws ParserConfigurationException
*/
public org.dom4j.Element convert(org.w3c.dom.Element element) throws ParserConfigurationException
{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
org.w3c.dom.Document doc1 = builder.newDocument();
org.w3c.dom.Element importedElement = (org.w3c.dom.Element) doc1.importNode(element, Boolean.TRUE);
doc1.appendChild(importedElement);
// Convert w3c document to dom4j document
DOMReader reader = new DOMReader();
org.dom4j.Document doc2 = reader.read(doc1);
return doc2.getRootElement();
}
@Override
public void returnArtifact(MuleArtifact artifact)
{
SpringXmlConfigurationBuilder builder = builders.remove(artifact);
MuleContext context = contexts.remove(artifact);
dispose(builder, context);
}
protected void dispose(SpringXmlConfigurationBuilder builder, MuleContext context)
{
try
{
if (context != null)
{
context.dispose();
}
}
finally
{
deleteLoggingThreads();
}
}
private void deleteLoggingThreads()
{
String[] threadsToDelete = {"Mule.log.clogging.ref.handler", "Mule.log.slf4j.ref.handler"};
Set threadSet = Thread.getAllStackTraces().keySet();
Thread[] threadArray = threadSet.toArray(new Thread[threadSet.size()]);
for (String threadToDelete : threadsToDelete)
{
for (Thread t : threadArray)
{
if (threadToDelete.equals(t.getName()))
{
try
{
t.interrupt();
}
catch (SecurityException e)
{
// ignore
}
}
}
}
}
}
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