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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed 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.tomcat.lifecycle.listener;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.apache.catalina.Context;
import org.apache.catalina.Lifecycle;
import org.apache.catalina.LifecycleEvent;
import org.apache.catalina.LifecycleListener;
import org.apache.catalina.deploy.FilterDef;
import org.apache.catalina.deploy.FilterMap;
import org.apache.tuscany.common.TuscanyRuntimeException;
import org.apache.tuscany.core.config.ConfigurationException;
import org.apache.tuscany.core.context.AggregateContext;
import org.apache.tuscany.core.context.EventContext;
import org.apache.tuscany.core.context.webapp.HTTPSessionExpirationListener;
import org.apache.tuscany.core.context.webapp.TuscanyRequestFilter;
import org.apache.tuscany.core.context.webapp.TuscanyWebAppRuntime;
import org.apache.tuscany.core.runtime.RuntimeContext;
import org.apache.tuscany.core.runtime.RuntimeMonitor;
import org.apache.tuscany.model.assembly.ModuleComponent;
/**
* Responsible for initializing web applications as module components in a Tomcat instance. When a web app is being
* loaded in Tomcat, this listener receives a callback to register a corresponding module component and set up the
* appropriate Servlet filters in the web context.
* <p>
* Note that Tomcat loads this class in the standard (common/lib) classloader even though the context classloader is
* that of the web app being loaded.
*/
public class WebAppLifecycleListener implements LifecycleListener {
private RuntimeContext runtime;
private RuntimeMonitor monitor;
// ----------------------------------
// Constructors
// ----------------------------------
public WebAppLifecycleListener() {
// locate runtime in the global naming context
javax.naming.Context context = null;
try {
context = (javax.naming.Context) (new InitialContext()).lookup("java:/");
runtime = (RuntimeContext) context.lookup(RuntimeBootstrap.RUNTIME_NAME);
monitor = runtime.getMonitorFactory().getMonitor(RuntimeMonitor.class);
} catch (NamingException e) {
// FIXME need bootstrap logging;
return;
}
}
/**
* Callback for receiving web application events. When a web app containing an SCA configuration is initialized, a
* module component is created and appropriate SCA filters are set for in the web context. If a web app stop event
* is received, the corresponding module component is deregistered from the system.
*/
public void lifecycleEvent(LifecycleEvent event) {
String lifecycleEventType = event.getType();
Object lifecycleEventSource = event.getSource();
if (Lifecycle.START_EVENT.equals(lifecycleEventType) && lifecycleEventSource instanceof Context) {
// The web app is starting
Context context = (Context) lifecycleEventSource;
String name = context.getPath().substring(1);
try {
ModuleComponent moduleComponent = null;// FIXME runtime.loadModuleComponent(name, "sca.module");
if (moduleComponent == null) {
return; // not an SCA module component
}
// create the module component
runtime.registerModelObject(moduleComponent);
AggregateContext aggregateContext = (AggregateContext) runtime.getContext(moduleComponent.getName());
TuscanyWebAppRuntime tuscanyRuntime = new TuscanyWebAppRuntime(aggregateContext);
context.getServletContext().setAttribute(TuscanyWebAppRuntime.class.getName(), tuscanyRuntime);
// Start the runtime and the module component context
tuscanyRuntime.start();
try {
aggregateContext.start();
aggregateContext.fireEvent(EventContext.MODULE_START, null);
} finally {
tuscanyRuntime.stop();
}
// Set up the SCA web app filter and listener
FilterDef def = new FilterDef();
def.setDescription("SCA Filter");
def.setFilterClass(TuscanyRequestFilter.class.getName());
def.setFilterName("__modContext");
def.setDisplayName("SCA Filter");
FilterMap map = new FilterMap();
map.setFilterName("__modContext");
map.setURLPattern("/*");
context.addFilterDef(def);
context.addFilterMap(map);
context.addApplicationListener(HTTPSessionExpirationListener.class.getName());
} catch (ConfigurationException e) {
e.addContextName(name);
monitor.log(e);
return;
} catch (TuscanyRuntimeException e) {
e.addContextName(name);
monitor.log(e);
return;
}
} else if (Lifecycle.STOP_EVENT.equals(lifecycleEventType) && lifecycleEventSource instanceof Context) {
// The web app is stopping
Context context = (Context) lifecycleEventSource;
// Get the tuscany runtime from the servlet context
TuscanyWebAppRuntime tuscanyRuntime = (TuscanyWebAppRuntime) context.getServletContext().getAttribute(
TuscanyWebAppRuntime.class.getName());
if (tuscanyRuntime == null) {
return; // not an SCA module
}
try {
// Stop the module context
tuscanyRuntime.start();
AggregateContext aggregateContext = tuscanyRuntime.getModuleComponentContext();
aggregateContext.fireEvent(EventContext.MODULE_STOP, null);
aggregateContext.stop();
} catch (TuscanyRuntimeException e) {
monitor.log(e);
} finally {
try {
tuscanyRuntime.stop();
} catch (TuscanyRuntimeException e) {
monitor.log(e);
} finally {
// Cleanup the servlet context
context.getServletContext().removeAttribute(TuscanyWebAppRuntime.class.getName());
}
}
}
}
}
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