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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.core.webapp;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import org.osoa.sca.CurrentModuleContext;
import org.osoa.sca.ModuleContext;
import org.apache.tuscany.common.monitor.MonitorFactory;
import org.apache.tuscany.common.monitor.impl.NullMonitorFactory;
import org.apache.tuscany.common.resource.ResourceLoader;
import org.apache.tuscany.common.resource.impl.ResourceLoaderImpl;
import org.apache.tuscany.core.builder.RuntimeConfigurationBuilder;
import org.apache.tuscany.core.builder.impl.DefaultWireBuilder;
import org.apache.tuscany.core.config.ConfigurationException;
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.core.runtime.RuntimeContextImpl;
import org.apache.tuscany.core.system.builder.SystemComponentContextBuilder;
import org.apache.tuscany.core.system.builder.SystemEntryPointBuilder;
import org.apache.tuscany.core.system.builder.SystemExternalServiceBuilder;
import org.apache.tuscany.core.system.loader.SystemSCDLModelLoader;
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.AssemblyFactoryImpl;
import org.apache.tuscany.model.assembly.impl.AssemblyModelContextImpl;
import org.apache.tuscany.model.assembly.loader.AssemblyModelLoader;
import org.apache.tuscany.model.scdl.loader.SCDLModelLoader;
import org.apache.tuscany.model.scdl.loader.impl.SCDLAssemblyModelLoaderImpl;
/**
* ServletContextListener that can be added to a standard web application to boot
* a Tuscany runtime inside that application. All implementation classes should
* be located in the web application itself.
*
* @version $Rev: 380792 $ $Date: 2006-02-24 11:25:11 -0800 (Fri, 24 Feb 2006) $
*/
public class TuscanyServletListener implements ServletContextListener, HttpSessionListener {
public static final String SCA_COMPONENT_NAME = "org.apache.tuscany.core.webapp.ModuleComponentName";
public static final String MODULE_COMPONENT_NAME = "org.apache.tuscany.core.webapp.ModuleComponentContext";
public static final String TUSCANY_RUNTIME_NAME = RuntimeContext.class.getName();
private final Object sessionKey = new Object();
private RuntimeContext runtimeContext;
private AggregateContext systemModuleComponentContext;
private AggregateContext moduleContext;
private static final String SYSTEM_MODULE_COMPONENT = "org.apache.tuscany.core.system";
public void contextInitialized(ServletContextEvent servletContextEvent) {
ServletContext servletContext = servletContextEvent.getServletContext();
String name = servletContext.getInitParameter(SCA_COMPONENT_NAME);
String uri = name; // todo get from context path
MonitorFactory monitorFactory = new NullMonitorFactory(); // todo have one that writes to the servlet log
try {
bootRuntime(name, uri, monitorFactory);
} catch (ConfigurationException e) {
throw new RuntimeException(e.getMessage(), e);
}
servletContext.setAttribute(TUSCANY_RUNTIME_NAME, runtimeContext);
servletContext.setAttribute(MODULE_COMPONENT_NAME, moduleContext);
}
public void contextDestroyed(ServletContextEvent servletContextEvent) {
moduleContext.fireEvent(EventContext.MODULE_STOP, null);
moduleContext.stop();
systemModuleComponentContext.fireEvent(EventContext.MODULE_STOP, null);
systemModuleComponentContext.stop();
runtimeContext.stop();
servletContextEvent.getServletContext().removeAttribute(MODULE_COMPONENT_NAME);
servletContextEvent.getServletContext().removeAttribute(TUSCANY_RUNTIME_NAME);
}
public void sessionCreated(HttpSessionEvent event) {
// do nothing since sessions are lazily created in {@link TuscanyRequestFilter}
}
public void sessionDestroyed(HttpSessionEvent event) {
// todo do we actually need to bind the module context to the thread to fire this event?
ModuleContext oldContext = CurrentModuleContext.getContext();
try {
ContextBinder.BINDER.setContext((ModuleContext) moduleContext);
moduleContext.fireEvent(EventContext.SESSION_END, event.getSession());
} finally{
ContextBinder.BINDER.setContext(oldContext);
}
}
private void bootRuntime(String name, String uri, MonitorFactory monitorFactory) throws ConfigurationException {
// Create a resource loader from the current classloader
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
ResourceLoader resourceLoader = new ResourceLoaderImpl(classLoader);
// Create an assembly model factory
AssemblyFactory modelFactory=new AssemblyFactoryImpl();
// Create an assembly model loader
List<SCDLModelLoader> scdlLoaders=new ArrayList<SCDLModelLoader>();
scdlLoaders.add(new SystemSCDLModelLoader());
AssemblyModelLoader modelLoader=new SCDLAssemblyModelLoaderImpl(scdlLoaders);
// Create an assembly model context
AssemblyModelContext modelContext = new AssemblyModelContextImpl(modelFactory, modelLoader, resourceLoader);
// Create system configuration builders
List<RuntimeConfigurationBuilder> configBuilders = new ArrayList();
configBuilders.add((new SystemComponentContextBuilder()));
configBuilders.add(new SystemEntryPointBuilder());
configBuilders.add(new SystemExternalServiceBuilder());
// Create a runtime context and start it
runtimeContext = new RuntimeContextImpl(monitorFactory, scdlLoaders, configBuilders,new DefaultWireBuilder());
runtimeContext.start();
// Get the system context
AggregateContext systemContext = runtimeContext.getSystemContext();
// Load the system module component
ModuleComponentConfigurationLoader loader = new ModuleComponentConfigurationLoaderImpl(modelContext);
ModuleComponent systemModuleComponent = loader.loadSystemModuleComponent(SYSTEM_MODULE_COMPONENT, SYSTEM_MODULE_COMPONENT);
// Register it with the system context
systemContext.registerModelObject(systemModuleComponent);
// Get the aggregate context representing the system module component
systemModuleComponentContext = (AggregateContext) systemContext.getContext(SYSTEM_MODULE_COMPONENT);
systemModuleComponentContext.registerModelObject(systemModuleComponent.getComponentImplementation());
systemModuleComponentContext.fireEvent(EventContext.MODULE_START, null);
// Load the SCDL configuration of the application module
ModuleComponent moduleComponent = loader.loadModuleComponent(name, uri);
// Register it under the root application context
runtimeContext.getRootContext().registerModelObject(moduleComponent);
moduleContext=(AggregateContext)runtimeContext.getContext(moduleComponent.getName());
moduleContext.registerModelObject(moduleComponent.getComponentImplementation());
moduleContext.fireEvent(EventContext.MODULE_START, null);
}
}
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