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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.sca.host.http;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.core.LifeCycleListener;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceHelper;
/**
* Default implementation of a Servlet host extension point.
*
* @version $Rev$ $Date$
*/
public class DefaultServletHostExtensionPoint implements ServletHostExtensionPoint, LifeCycleListener {
private List<ServletHost> servletHosts = new ArrayList<ServletHost>();
private boolean loaded;
private boolean webApp;
private ExtensionPointRegistry registry;
public DefaultServletHostExtensionPoint(ExtensionPointRegistry registry) {
this.registry = registry;
}
public void addServletHost(ServletHost servletHost) {
servletHosts.add(servletHost);
if (servletHost instanceof LifeCycleListener) {
((LifeCycleListener)servletHost).start();
}
}
public void removeServletHost(ServletHost servletHost) {
servletHosts.remove(servletHost);
if (servletHost instanceof LifeCycleListener) {
((LifeCycleListener)servletHost).stop();
}
}
public List<ServletHost> getServletHosts() {
loadServletHosts();
return servletHosts;
}
private synchronized void loadServletHosts() {
if (loaded)
return;
// Get the databinding service declarations
Collection<ServiceDeclaration> sds;
try {
sds = registry.getServiceDiscovery().getServiceDeclarations(ServletHost.class, true);
} catch (IOException e) {
throw new IllegalStateException(e);
}
// Load data bindings
for (ServiceDeclaration sd : sds) {
// Create a data binding wrapper and register it
ServletHost servletHost = new LazyServletHost(sd);
addServletHost(servletHost);
}
loaded = true;
}
/**
* A data binding facade allowing data bindings to be lazily loaded and
* initialized.
*/
public class LazyServletHost implements ServletHost, LifeCycleListener {
private ServiceDeclaration sd;
private ServletHost host;
/**
* @param sd
*/
public LazyServletHost(ServiceDeclaration sd) {
super();
this.sd = sd;
}
public synchronized ServletHost getServletHost() {
if (host == null) {
try {
host = ServiceHelper.newInstance(registry, sd);
ServiceHelper.start(host);
} catch (Throwable e) {
throw new IllegalStateException(e);
}
}
return host;
}
public String addServletMapping(String uri, Servlet servlet) throws ServletMappingException {
return getServletHost().addServletMapping(uri, servlet);
}
public String addServletMapping(String uri, Servlet servlet, SecurityContext securityContext) throws ServletMappingException {
return getServletHost().addServletMapping(uri, servlet, securityContext);
}
public String getContextPath() {
return getServletHost().getContextPath();
}
public int getDefaultPort() {
return getServletHost().getDefaultPort();
}
public RequestDispatcher getRequestDispatcher(String uri) throws ServletMappingException {
return getServletHost().getRequestDispatcher(uri);
}
public Servlet getServletMapping(String uri) throws ServletMappingException {
return getServletHost().getServletMapping(uri);
}
public URL getURLMapping(String uri, SecurityContext securityContext) {
return getServletHost().getURLMapping(uri, securityContext);
}
public Servlet removeServletMapping(String uri) throws ServletMappingException {
return getServletHost().removeServletMapping(uri);
}
public void setAttribute(String name, Object value) {
getServletHost().setAttribute(name, value);
}
public void setContextPath(String path) {
getServletHost().setContextPath(path);
}
public void setDefaultPort(int port) {
getServletHost().setDefaultPort(port);
}
public String getName() {
return sd.getAttributes().get("name");
}
public void start() {
}
public void stop() {
ServiceHelper.stop(host);
}
@Override
public ServletContext getServletContext() {
return getServletHost().getServletContext();
}
}
public void start() {
}
public void stop() {
ServiceHelper.stop(servletHosts);
servletHosts.clear();
registry = null;
}
public boolean isWebApp() {
return webApp;
}
public void setWebApp(boolean webApp) {
this.webApp = webApp;
}
}
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