| /* |
| * 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.myfaces.extensions.cdi.jsf2.impl.scope.view; |
| |
| import org.apache.myfaces.extensions.cdi.core.api.provider.BeanManagerProvider; |
| |
| import java.lang.annotation.Annotation; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import javax.enterprise.context.ContextNotActiveException; |
| import javax.enterprise.context.spi.Context; |
| import javax.enterprise.context.spi.Contextual; |
| import javax.enterprise.context.spi.CreationalContext; |
| |
| import javax.enterprise.inject.spi.BeanManager; |
| import javax.enterprise.inject.spi.PassivationCapable; |
| import javax.faces.bean.ViewScoped; |
| import javax.faces.component.UIViewRoot; |
| import javax.faces.context.FacesContext; |
| import javax.faces.event.PreDestroyViewMapEvent; |
| import javax.faces.event.SystemEvent; |
| import javax.faces.event.SystemEventListener; |
| |
| /** |
| * This class provides the contexts lifecycle for the |
| * new JSF-2 @ViewScoped Context. |
| */ |
| public class ViewScopedContext implements Context, SystemEventListener |
| { |
| private static final String COMPONENT_ID_MAP_NAME ="codi.componentIdMap"; |
| private static final String CREATIONAL_MAP_NAME ="codi.creationalInstanceMap"; |
| private static final String UNCHECKED = "unchecked"; |
| |
| private boolean isJsfSubscribed = false; |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public <T> T get(Contextual<T> component) |
| { |
| //workaround for openejb - see EXTCDI-304 |
| if (component == null) |
| { |
| return null; |
| } |
| |
| checkActive(); |
| |
| if(!isJsfSubscribed) |
| { |
| FacesContext.getCurrentInstance().getApplication().subscribeToEvent(PreDestroyViewMapEvent.class, this); |
| |
| isJsfSubscribed = true; |
| } |
| |
| Map<String, Object> viewMap = getViewMap(); |
| |
| @SuppressWarnings(UNCHECKED) |
| Map<String, Object> componentIdMap = (Map<String, Object>) viewMap.get(COMPONENT_ID_MAP_NAME); |
| |
| if(componentIdMap == null) |
| { |
| return null; |
| } |
| |
| @SuppressWarnings(UNCHECKED) |
| T instance = (T)componentIdMap.get(((PassivationCapable)component).getId()); |
| return instance; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public <T> T get(Contextual<T> component, CreationalContext<T> creationalContext) |
| { |
| if(!(component instanceof PassivationCapable)) |
| { |
| throw new IllegalStateException(component.toString() + |
| " doesn't implement " + PassivationCapable.class.getName()); |
| } |
| |
| checkActive(); |
| |
| Map<String, Object> viewMap = getViewMap(); |
| |
| @SuppressWarnings(UNCHECKED) |
| Map<String, Object> componentIdMap = (Map<String, Object>) viewMap.get(COMPONENT_ID_MAP_NAME); |
| |
| if(componentIdMap == null) |
| { |
| // TODO we now need to start being carefull with reentrancy... |
| componentIdMap = new ConcurrentHashMap<String, Object>(); |
| viewMap.put(COMPONENT_ID_MAP_NAME, componentIdMap); |
| } |
| |
| @SuppressWarnings(UNCHECKED) |
| T instance = (T) componentIdMap.get(((PassivationCapable)component).getId()); |
| if (instance != null) |
| { |
| return instance; |
| } |
| |
| if(creationalContext == null) |
| { |
| return null; |
| } |
| |
| instance = component.create(creationalContext); |
| |
| if (instance == null) |
| { |
| return null; |
| } |
| |
| @SuppressWarnings(UNCHECKED) |
| Map<String, CreationalContext<?>> creationalContextMap |
| = (Map<String, CreationalContext<?>>) viewMap.get(CREATIONAL_MAP_NAME); |
| |
| if(creationalContextMap == null) |
| { |
| creationalContextMap = new ConcurrentHashMap<String, CreationalContext<?>>(); |
| viewMap.put(CREATIONAL_MAP_NAME, creationalContextMap); |
| } |
| |
| componentIdMap.put(((PassivationCapable)component).getId(), instance); |
| creationalContextMap.put(((PassivationCapable)component).getId(), creationalContext); |
| |
| return instance; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Class<? extends Annotation> getScope() |
| { |
| return ViewScoped.class; |
| } |
| |
| /** |
| * The view context is active if a valid ViewRoot could be detected. |
| */ |
| public boolean isActive() |
| { |
| return getViewRoot() != null; |
| } |
| |
| private void checkActive() |
| { |
| if (!isActive()) |
| { |
| throw new ContextNotActiveException("WebBeans context with scope annotation " + |
| "@ViewScoped is not active with respect to the current thread"); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean isListenerForSource(Object source) |
| { |
| if (source instanceof UIViewRoot) |
| { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * We get PreDestroyViewMapEvent events from the JSF servlet and destroy our contextual |
| * instances. This should (theoretically!) also get fired if the webapp closes, so there |
| * should be no need to manually track all view scopes and destroy them at a shutdown. |
| * |
| * @see javax.faces.event.SystemEventListener#processEvent(javax.faces.event.SystemEvent) |
| */ |
| @SuppressWarnings(UNCHECKED) |
| public void processEvent(SystemEvent event) |
| { |
| if (event instanceof PreDestroyViewMapEvent) |
| { |
| // better use the viewmap we get from the event to prevent concurrent modification problems |
| Map<String, Object> viewMap = ((UIViewRoot) event.getSource()).getViewMap(); |
| |
| Map<String, Object> componentIdMap |
| = (Map<String, Object>) viewMap.get(COMPONENT_ID_MAP_NAME); |
| |
| Map<String, CreationalContext<?>> creationalContextMap |
| = (Map<String, CreationalContext<?>>) viewMap.get(CREATIONAL_MAP_NAME); |
| |
| if(componentIdMap != null) |
| { |
| BeanManager beanManager = BeanManagerProvider.getInstance().getBeanManager(); |
| for ( Entry<String, Object> componentEntry : componentIdMap.entrySet()) |
| { |
| String beanId = componentEntry.getKey(); |
| // there is no nice way to explain the Java Compiler that we are handling the same type T, |
| // therefore we need completely drop the type information :( |
| Contextual contextual = beanManager.getPassivationCapableBean(beanId); |
| Object instance = componentEntry.getValue(); |
| CreationalContext creational = creationalContextMap.get(beanId); |
| |
| contextual.destroy(instance, creational); |
| } |
| } |
| } |
| } |
| |
| |
| protected UIViewRoot getViewRoot() |
| { |
| FacesContext context = FacesContext.getCurrentInstance(); |
| |
| if(context != null) |
| { |
| return context.getViewRoot(); |
| } |
| |
| return null; |
| } |
| |
| protected Map<String, Object> getViewMap() |
| { |
| UIViewRoot viewRoot = getViewRoot(); |
| |
| if (viewRoot != null) |
| { |
| return viewRoot.getViewMap(true); |
| } |
| |
| return null; |
| } |
| } |