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author | antelder <antelder@13f79535-47bb-0310-9956-ffa450edef68> | 2009-10-28 09:54:25 +0000 |
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committer | antelder <antelder@13f79535-47bb-0310-9956-ffa450edef68> | 2009-10-28 09:54:25 +0000 |
commit | 613b275ffa5d7ae0c41b625db231c187b8a136ef (patch) | |
tree | 74f448551ee167bfb627fa51849f006e4f5ffb31 /branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java | |
parent | 17d6a0df23caf287e42c7dbf3919e49d60fdedd2 (diff) |
Create 2.0 M4 release branch
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@830484 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java')
-rw-r--r-- | branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java new file mode 100644 index 0000000000..d91485cbb5 --- /dev/null +++ b/branches/sca-java-2.0-M4/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java @@ -0,0 +1,198 @@ +/* + * 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.lang.reflect.Constructor; +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 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.ServiceDiscovery; + +/** + * 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 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 = ServiceDiscovery.getInstance().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 { + Class<?> cls = sd.loadClass(); + Constructor<?> ctor = null; + try { + ctor = cls.getConstructor(ExtensionPointRegistry.class); + host = (ServletHost)ctor.newInstance(registry); + } catch (NoSuchMethodException e) { + ctor = cls.getConstructor(); + host = (ServletHost)ctor.newInstance(); + } + if(host instanceof LifeCycleListener) { + ((LifeCycleListener) host).start(); + } + } catch (Throwable e) { + throw new IllegalStateException(e); + } + } + return host; + } + + public void addServletMapping(String uri, Servlet servlet) throws ServletMappingException { + getServletHost().addServletMapping(uri, servlet); + } + + 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) { + return getServletHost().getURLMapping(uri); + } + + 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() { + if (host instanceof LifeCycleListener) { + ((LifeCycleListener)host).stop(); + } + } + } + + public void start() { + } + + public void stop() { + for (ServletHost host : servletHosts) { + if (host instanceof LifeCycleListener) { + ((LifeCycleListener)host).stop(); + } + } + servletHosts.clear(); + registry = null; + } +} |