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/**
*
* Copyright 2005 The Apache Software Foundation
*
* 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;
import javax.servlet.ServletContext;
import org.apache.catalina.Context;
import org.apache.catalina.Lifecycle;
import org.apache.catalina.LifecycleEvent;
import org.apache.catalina.LifecycleListener;
import org.apache.catalina.util.StringManager;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tuscany.common.resource.ResourceLoader;
import org.apache.tuscany.common.resource.impl.ResourceLoaderImpl;
import org.apache.tuscany.core.client.BootstrapHelper;
import org.apache.tuscany.core.config.ConfigurationException;
import org.apache.tuscany.core.config.ModuleComponentConfigurationLoader;
import org.apache.tuscany.core.context.CompositeContext;
import org.apache.tuscany.core.context.EventException;
import org.apache.tuscany.core.context.event.ModuleStart;
import org.apache.tuscany.core.context.event.ModuleStop;
import org.apache.tuscany.core.runtime.RuntimeContext;
import org.apache.tuscany.model.assembly.AssemblyFactory;
import org.apache.tuscany.model.assembly.ModuleComponent;
import org.apache.tuscany.model.assembly.impl.AssemblyContextImpl;
import org.apache.tuscany.model.assembly.loader.AssemblyModelLoader;
/**
* @version $Rev$ $Date$
*/
public class TuscanyContextListener implements LifecycleListener {
private static final Log log = LogFactory.getLog(TuscanyContextListener.class);
private static final StringManager sm = StringManager.getManager("org.apache.tuscany.tomcat");
private static final String TUSCANY_RUNTIME_NAME = RuntimeContext.class.getName();
public static final String MODULE_COMPONENT_NAME = "org.apache.tuscany.core.webapp.ModuleComponentContext";
private final AssemblyFactory modelFactory;
private final AssemblyModelLoader modelLoader;
private final RuntimeContext runtime;
private CompositeContext moduleContext;
private TuscanyValve valve;
public TuscanyContextListener(RuntimeContext runtimeContext, AssemblyFactory modelFactory, AssemblyModelLoader modelLoader) {
this.runtime = runtimeContext;
this.modelFactory = modelFactory;
this.modelLoader = modelLoader;
}
public void lifecycleEvent(LifecycleEvent event) {
String type = event.getType();
if (Lifecycle.AFTER_START_EVENT.equals(type)) {
startContext((Context) event.getLifecycle());
} else if (Lifecycle.STOP_EVENT.equals(type)) {
stopContext((Context) event.getLifecycle());
}
}
private void startContext(Context ctx) {
ClassLoader appLoader = ctx.getLoader().getClassLoader();
if (appLoader.getResource("sca.module") == null) {
return;
}
log.info(sm.getString("context.configLoad", ctx.getName()));
try {
loadContext(ctx);
} catch (ConfigurationException e) {
log.error(sm.getString("context.configError"), e);
// todo mark application as unavailable
return;
}
try {
moduleContext.publish(new ModuleStart(this));
} catch (EventException e) {
log.error(sm.getString("context.moduleStartError"), e);
// todo unload module component from runtime
// todo mark application as unavailable
return;
} catch (RuntimeException e) {
log.error(sm.getString("context.unknownRuntimeException"), e);
// todo unload module component from runtime
throw e;
}
// add a valve to this context's pipeline that will associate the request with the runtime
if (valve == null) {
valve = new TuscanyValve(moduleContext);
} else {
valve.setContext(moduleContext);
valve.setEnabled(true);
}
ctx.getPipeline().addValve(valve);
// add the RuntimeContext in as a servlet context parameter
ServletContext servletContext = ctx.getServletContext();
servletContext.setAttribute(TUSCANY_RUNTIME_NAME, runtime);
servletContext.setAttribute(MODULE_COMPONENT_NAME, moduleContext);
}
private void loadContext(Context ctx) throws ConfigurationException {
ResourceLoader resourceLoader = new ResourceLoaderImpl(ctx.getLoader().getClassLoader());
ClassLoader oldCl = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
try {
AssemblyContextImpl modelContext = new AssemblyContextImpl(modelFactory, modelLoader, resourceLoader, ctx.getName());
ModuleComponentConfigurationLoader loader = BootstrapHelper.getConfigurationLoader(runtime.getSystemContext(), modelContext);
// Load the SCDL configuration of the application module
ModuleComponent moduleComponent = loader.loadModuleComponent(ctx.getName(), ctx.getPath());
// Register it under the root application context
CompositeContext rootContext = runtime.getRootContext();
rootContext.registerModelObject(moduleComponent);
moduleContext = (CompositeContext) rootContext.getContext(moduleComponent.getName());
//TODO remove the hack below
moduleContext.setAssemblyContext(modelContext);
} finally {
Thread.currentThread().setContextClassLoader(oldCl);
}
}
private void stopContext(Context ctx) {
if (moduleContext != null) {
moduleContext.publish(new ModuleStop(this));
}
CompositeContext rootContext = runtime.getRootContext();
rootContext.removeContext(moduleContext.getName());
valve.setEnabled(false);
//ctx.getPipeline().removeValve(valve);
//valve = null;
moduleContext.stop();
moduleContext = null;
// todo unload module component from runtime
}
}
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