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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.util.ArrayList;
import java.util.List;
import org.apache.catalina.Container;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.core.StandardContext;
import org.apache.catalina.core.StandardHost;
import org.apache.catalina.util.StringManager;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.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.context.SystemAggregateContext;
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;
/**
* A Tomcat listener to be attached to a Host container to add SCA runtime functionality.
* The listener wraps a Tuscany runtime and listens for container events to detect the
* addition and removal of Context children.
*
* @version $Rev$ $Date$
*/
public class TuscanyHost extends StandardHost {
private static final String SYSTEM_MODULE_COMPONENT = "org.apache.tuscany.core.system";
private static final Log log = LogFactory.getLog(TuscanyHost.class);
private static final StringManager sm = StringManager.getManager("org.apache.tuscany.tomcat");
private RuntimeContext runtime;
private AssemblyModelLoader modelLoader;
private AssemblyFactory modelFactory;
private ResourceLoader systemLoader;
public synchronized void start() throws LifecycleException {
startRuntime();
super.start();
}
public synchronized void stop() throws LifecycleException {
super.stop();
stopRuntime();
}
private void startRuntime() {
systemLoader = new ResourceLoaderImpl(getClass().getClassLoader());
// Create an assembly model factory
modelFactory = new AssemblyFactoryImpl();
// Create an assembly model loader
List<SCDLModelLoader> scdlLoaders=new ArrayList<SCDLModelLoader>();
scdlLoaders.add(new SystemSCDLModelLoader());
modelLoader = new SCDLAssemblyModelLoaderImpl(scdlLoaders);
// Create an assembly model context
AssemblyModelContext modelContext = new AssemblyModelContextImpl(modelFactory, modelLoader, systemLoader);
// Load the system module component
ModuleComponentConfigurationLoader loader = new ModuleComponentConfigurationLoaderImpl(modelContext);
ModuleComponent systemModuleComponent;
try {
systemModuleComponent = loader.loadSystemModuleComponent(SYSTEM_MODULE_COMPONENT, SYSTEM_MODULE_COMPONENT);
} catch (ConfigurationLoadException e) {
log.warn(sm.getString("runtime.loadSystemFailed"), e);
return;
}
List<RuntimeConfigurationBuilder> configBuilders = new ArrayList();
configBuilders.add((new SystemComponentContextBuilder()));
configBuilders.add(new SystemEntryPointBuilder());
configBuilders.add(new SystemExternalServiceBuilder());
runtime = new RuntimeContextImpl(new NullMonitorFactory(), scdlLoaders, configBuilders, new DefaultWireBuilder());
runtime.start();
try {
SystemAggregateContext systemContext = runtime.getSystemContext();
systemContext.registerModelObject(systemModuleComponent);
// Get the aggregate context representing the system module component
AggregateContext systemModuleComponentContext = (AggregateContext) systemContext.getContext(SYSTEM_MODULE_COMPONENT);
systemModuleComponentContext.registerModelObject(systemModuleComponent.getComponentImplementation());
systemModuleComponentContext.fireEvent(EventContext.MODULE_START, null);
} catch (Exception e) {
log.warn(sm.getString("runtime.registerSystemFailed"), e);
runtime.stop();
runtime = null;
return;
}
log.info(sm.getString("runtime.started"));
}
private void stopRuntime() {
if (runtime == null) {
return;
}
runtime.stop();
runtime = null;
log.info(sm.getString("runtime.stopped"));
}
public synchronized void addChild(Container child) {
if (!(child instanceof StandardContext)) {
throw new IllegalArgumentException(sm.getString("tuscanyHost.notContext"));
}
StandardContext ctx = (StandardContext) child;
ctx.addLifecycleListener(new TuscanyContextListener(runtime, modelFactory, modelLoader, systemLoader));
super.addChild(child);
}
public String toString() {
StringBuffer sb = new StringBuffer(132);
if (getParent() != null) {
sb.append(getParent().toString()).append('.');
}
sb.append("TuscanyHost[").append(getName()).append(']');
return (sb.toString());
}
}
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