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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 java.io.IOException;
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.Valve;
import org.apache.catalina.core.StandardWrapper;
import org.apache.tuscany.binding.axis2.handler.WebServiceEntryPointServlet;
import org.apache.tuscany.common.resource.ResourceLoader;
import org.apache.tuscany.common.resource.impl.ResourceLoaderImpl;
import org.apache.tuscany.core.config.ConfigurationException;
import org.apache.tuscany.core.config.ConfigurationLoadException;
import org.apache.tuscany.core.config.ModuleComponentConfigurationLoader;
import org.apache.tuscany.core.config.impl.ModuleComponentConfigurationLoaderImpl;
import org.apache.tuscany.core.context.AggregateContext;
import org.apache.tuscany.core.context.EventContext;
import org.apache.tuscany.core.runtime.RuntimeContext;
import org.apache.tuscany.model.assembly.AssemblyFactory;
import org.apache.tuscany.model.assembly.AssemblyModelContext;
import org.apache.tuscany.model.assembly.ModuleComponent;
import org.apache.tuscany.model.assembly.impl.AssemblyModelContextImpl;
import org.apache.tuscany.model.assembly.loader.AssemblyModelLoader;
/**
* @version $Rev$ $Date$
*/
public class TuscanyContextListener implements LifecycleListener {
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 final ResourceLoader systemLoader;
private AggregateContext moduleContext;
public TuscanyContextListener(RuntimeContext runtimeContext, AssemblyFactory modelFactory, AssemblyModelLoader modelLoader, ResourceLoader systemLoader) {
this.runtime = runtimeContext;
this.modelFactory = modelFactory;
this.modelLoader = modelLoader;
this.systemLoader = systemLoader;
}
public void lifecycleEvent(LifecycleEvent event) {
String type = event.getType();
if (Lifecycle.START_EVENT.equals(type)) {
startContext((Context) event.getLifecycle());
} else if (Lifecycle.STOP_EVENT.equals(type)) {
stopContext((Context) event.getLifecycle());
}
}
private void startContext(Context ctx) {
ResourceLoader resourceLoader = new ResourceLoaderImpl(ctx.getLoader().getClassLoader());
try {
if (resourceLoader.getResource("sca.module") == null) {
return;
}
} catch (IOException e) {
return;
}
ClassLoader oldCl = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
try {
AssemblyModelContext modelContext = new AssemblyModelContextImpl(modelFactory, modelLoader, systemLoader, resourceLoader);
ModuleComponentConfigurationLoader loader = new ModuleComponentConfigurationLoaderImpl(modelContext);
try {
// Load the SCDL configuration of the application module
ModuleComponent moduleComponent = loader.loadModuleComponent(ctx.getName(), ctx.getPath());
// Register it under the root application context
AggregateContext rootContext = runtime.getRootContext();
rootContext.registerModelObject(moduleComponent);
moduleContext = (AggregateContext)rootContext.getContext(moduleComponent.getName());
moduleContext.registerModelObject(moduleComponent.getComponentImplementation());
} catch (ConfigurationLoadException e) {
throw new UnsupportedOperationException();
} catch (ConfigurationException e) {
throw new UnsupportedOperationException();
}
} finally {
Thread.currentThread().setContextClassLoader(oldCl);
}
moduleContext.fireEvent(EventContext.MODULE_START, null);
// add a valve to this context's pipeline that will associate the request with the runtime
Valve valve = new TuscanyValve(moduleContext);
ctx.getPipeline().addValve(valve);
// add the web service servlet wrapper
addWebServiceWrapper(ctx);
// 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 stopContext(Context ctx) {
if (moduleContext!=null) {
moduleContext.fireEvent(EventContext.MODULE_START, null);
}
// todo unload module component from runtime
}
private static void addWebServiceWrapper(Context ctx) {
// todo this should not depend on axis2, we need an API in the model for embedders
// todo should only add this servlet if we need it
// todo servlet implementation should be determined by the binding implementation
// todo should get path from entry point definition and not hard code to /services
Class<WebServiceEntryPointServlet> servletClass = WebServiceEntryPointServlet.class;
StandardWrapper wrapper = new StandardWrapper();
wrapper.setName("TuscanyAxis2EntryPointServlet");
wrapper.setLoader(new ContainerLoader(servletClass.getClassLoader()));
wrapper.setServletClass(servletClass.getName());
ctx.addChild(wrapper);
ctx.addServletMapping("/services/*", wrapper.getName());
}
}
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