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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.tuscany.sca.tomcat;
import java.io.File;
import java.lang.reflect.Method;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.logging.Logger;
import javax.naming.NameClassPair;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.Loader;
import org.apache.catalina.core.StandardContext;
/**
* A Tuscany StandardContext to initilize SCA applications.
* There is a StandardContext instance for each webapp and its
* called to handle all start/stop/etc requests. This intercepts
* the start and inserts any required Tuscany configuration.
*/
public class TuscanyStandardContext extends StandardContext {
private static final long serialVersionUID = 1L;
private static final Logger log = Logger.getLogger(TuscanyStandardContext.class.getName());
private boolean isSCAApp;
// TODO: this gives an instance per webapp, work out how to have only one per server
// ?? is that comment still true?
private static URLClassLoader tuscanyClassLoader;
private static Object node;
private static Class<?> nodeClass;
private static Method nodeStopMethod;
public TuscanyStandardContext() {
}
/**
* Overrides the getLoader method in the Tomcat StandardContext as its a convenient
* point to insert the Tuscany initilization. This gets called the first time during
* StandardContext.start after the webapp resources have been created so this can
* use getResources() to look for the SCA web.composite or sca-contribution.xml files,
* but its still early enough in start to insert the required Tuscany config.
*/
@Override
public Loader getLoader() {
if (loader != null) {
return loader;
}
ClassLoader parent = getParentClassLoader();
if (isSCAApp = isSCAApplication()) {
if (tuscanyClassLoader == null) {
initTuscany();
}
setParentClassLoader(getTuscanyClassloader(parent));
setDefaultWebXml("conf/tuscany-web.xml");
}
return super.getLoader();
}
@Override
public boolean listenerStart() {
if (isSCAApp) {
enableTuscany();
}
return super.listenerStart();
}
private void enableTuscany() {
if (isUseNaming() && getNamingContextListener() != null) {
setAnnotationProcessor(new TuscanyAnnotationsProcessor(this, getNamingContextListener().getEnvContext()));
} else {
setAnnotationProcessor(new TuscanyAnnotationsProcessor(this, null));
}
log.info("Tuscany SCA is enabled for: " + this.getName());
}
private boolean isSCAApplication() {
Object o = null;
try {
o = getResources().lookup("WEB-INF/web.composite");
} catch (NamingException e) {
}
if (o == null) {
try {
o = getResources().lookup("META-INF/sca-contribution.xml");
} catch (NamingException e) {
}
}
if (o == null) {
return false;
}
// Try to see if the Tuscany jars are packaged in the webapp
NamingEnumeration<NameClassPair> enumeration;
try {
enumeration = getResources().list("WEB-INF/lib");
while (enumeration.hasMoreElements()) {
String jar = enumeration.nextElement().getName();
if (jar.startsWith("tuscany-")) {
// Do not alter is
log.info("Tuscany SCA ignoring webapp with embedded Tuscany runtime: " + this.getName());
return false;
}
}
} catch (NamingException e) {
}
return true;
}
private URLClassLoader getTuscanyClassloader(ClassLoader parent) {
return tuscanyClassLoader;
}
private void initTuscany() {
initTuscanyClassloader(getParentClassLoader());
initDomain();
}
private void initTuscanyClassloader(ClassLoader parent) {
if (tuscanyClassLoader == null) {
File tuscanyWar = new File(System.getProperty(TuscanyLifecycleListener.TUSCANY_WAR_PROP));
File[] runtimeJars = new File(tuscanyWar, "tuscany-lib").listFiles();
try {
URL[] jarURLs = new URL[runtimeJars.length];
for (int i = 0; i < jarURLs.length; i++) {
jarURLs[i] = runtimeJars[i].toURI().toURL();
}
tuscanyClassLoader = new URLClassLoader(jarURLs, parent);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
private void initDomain() {
ClassLoader oldCL = Thread.currentThread().getContextClassLoader();
try {
Thread.currentThread().setContextClassLoader(tuscanyClassLoader);
Class<?> nodeFactoryClass = Class.forName("org.apache.tuscany.sca.node.NodeFactory", true, tuscanyClassLoader);
Method getInstanceMethod = nodeFactoryClass.getMethod("getInstance", new Class[0]);
Object instance = getInstanceMethod.invoke(null);
Method createNodeMethod = nodeFactoryClass.getMethod("createNode", new Class[]{URI.class, new String[0].getClass()});
URI domainURI = URI.create(TuscanyLifecycleListener.getDomainURI());
this.node = createNodeMethod.invoke(instance, new Object[]{domainURI, new String[0]});
this.nodeClass = Class.forName("org.apache.tuscany.sca.node.Node", true, tuscanyClassLoader);
Method nodeStartMethod = nodeClass.getMethod("start", new Class[0]);
this.nodeStopMethod = nodeClass.getMethod("stop", new Class[0]);
nodeStartMethod.invoke(node);
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
Thread.currentThread().setContextClassLoader(oldCL);
}
}
@Override
public synchronized void stop() throws LifecycleException {
super.stop();
if (node != null && nodeStopMethod != null) {
try {
nodeStopMethod.invoke(node);
node = null;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
}
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