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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.runtime.webapp;
import java.net.URL;
import java.net.URI;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.apache.tuscany.api.TuscanyRuntimeException;
import org.apache.tuscany.host.runtime.ShutdownException;
import static org.apache.tuscany.runtime.webapp.Constants.COMPOSITE_PARAM;
import static org.apache.tuscany.runtime.webapp.Constants.COMPONENT_PARAM;
import static org.apache.tuscany.runtime.webapp.Constants.ONLINE_PARAM;
import static org.apache.tuscany.runtime.webapp.Constants.RUNTIME_ATTRIBUTE;
import static org.apache.tuscany.runtime.webapp.Constants.APPLICATION_SCDL_PATH_DEFAULT;
import static org.apache.tuscany.runtime.webapp.Constants.APPLICATION_SCDL_PATH_PARAM;
/**
* Launches a Tuscany runtime in a web application, loading information from servlet context parameters. This listener
* manages one runtime per servlet context; the lifecycle of that runtime corresponds to the the lifecycle of the
* associated servlet context.
* <p/>
* The runtime is launched in a child classloader of the web application, thereby providing isolation between
* application and system artifacts. Application code only has access to the SCA API and may not reference Tuscany
* system artifacts directly.
* <p/>
* The <code>web.xml</code> of a web application embedding Tuscany must have entries for this listener and {@link
* TuscanySessionListener}. The latter notifies the runtime of session creation and expiration events through a
* "bridging" contract, {@link WebappRuntime}. The <code>web.xml</code> may also optionally be configured with entries
* for {@link TuscanyFilter} and {@link TuscanyServlet}. The former must be mapped to all urls that execute "unmanaged"
* code which accesses the Tuscany runtime though the SCA API, for example, JSPs and Servlets. The latter forwards
* service requests into the runtime, by default requests sent to URLs relative to the context path beginning with
* <code>/services</code>.
*
* @version $Rev$ $Date$
*/
public class TuscanyContextListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent event) {
ClassLoader webappClassLoader = Thread.currentThread().getContextClassLoader();
ServletContext servletContext = event.getServletContext();
WebappUtil utils = getUtils(servletContext);
try {
// FIXME work this out from the servlet context
String defaultComposite = "http://locahost/sca";
URI compositeId = new URI(utils.getInitParameter(COMPOSITE_PARAM, defaultComposite));
URI componentId = new URI(utils.getInitParameter(COMPONENT_PARAM, "webapp"));
String scdlPath = utils.getInitParameter(APPLICATION_SCDL_PATH_PARAM, APPLICATION_SCDL_PATH_DEFAULT);
URL scdl = servletContext.getResource(scdlPath);
boolean online = Boolean.valueOf(utils.getInitParameter(ONLINE_PARAM, "true"));
WebappRuntimeInfo info = new WebappRuntimeInfoImpl(servletContext,
servletContext.getResource("/WEB-INF/tuscany/"),
online);
ClassLoader bootClassLoader = utils.getBootClassLoader(webappClassLoader);
URL systemScdl = utils.getSystemScdl(bootClassLoader);
WebappRuntime runtime = utils.getRuntime(bootClassLoader);
runtime.setServletContext(servletContext);
runtime.setRuntimeInfo(info);
runtime.setHostClassLoader(webappClassLoader);
runtime.setSystemScdl(systemScdl);
runtime.initialize();
servletContext.setAttribute(RUNTIME_ATTRIBUTE, runtime);
runtime.deploy(compositeId, scdl, componentId);
} catch (TuscanyRuntimeException e) {
servletContext.log(e.getMessage(), e);
e.printStackTrace();
throw e;
} catch (Throwable e) {
servletContext.log(e.getMessage(), e);
e.printStackTrace();
throw new TuscanyInitException(e);
}
}
protected WebappUtil getUtils(ServletContext servletContext) {
return new WebappUtilImpl(servletContext);
}
public void contextDestroyed(ServletContextEvent event) {
ServletContext servletContext = event.getServletContext();
WebappRuntime runtime = (WebappRuntime) servletContext.getAttribute(RUNTIME_ATTRIBUTE);
if (runtime == null) {
return;
}
servletContext.removeAttribute(RUNTIME_ATTRIBUTE);
try {
runtime.destroy();
} catch (ShutdownException e) {
servletContext.log("Error destroying runtume", e);
}
}
}
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