001 /*
002 GRANITE DATA SERVICES
003 Copyright (C) 2012 GRANITE DATA SERVICES S.A.S.
004
005 This file is part of Granite Data Services.
006
007 Granite Data Services is free software; you can redistribute it and/or modify
008 it under the terms of the GNU Library General Public License as published by
009 the Free Software Foundation; either version 2 of the License, or (at your
010 option) any later version.
011
012 Granite Data Services is distributed in the hope that it will be useful, but
013 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015 for more details.
016
017 You should have received a copy of the GNU Library General Public License
018 along with this library; if not, see <http://www.gnu.org/licenses/>.
019 */
020
021 package org.granite.client.tide.cdi;
022
023 import java.lang.annotation.Annotation;
024
025 import javax.enterprise.context.ContextNotActiveException;
026 import javax.enterprise.context.spi.Context;
027 import javax.enterprise.context.spi.Contextual;
028 import javax.enterprise.context.spi.CreationalContext;
029
030 import org.granite.client.tide.ViewScope;
031 import org.granite.client.tide.ViewScope.BeanResetter;
032 import org.granite.client.tide.ViewScopeHolder;
033
034 /**
035 * @author William DRAI
036 */
037 public class ViewContext implements Context {
038
039 // private static final Logger log = Logger.getLogger(ViewScope.class);
040
041 private ViewScope beanCache;
042
043 public ViewContext() {
044 }
045
046 private ViewScope getBeanCache() {
047 if (beanCache == null) {
048 beanCache = ViewScopeHolder.get();
049 if (beanCache == null)
050 throw new RuntimeException("View bean cache not set");
051 }
052 return beanCache;
053 }
054
055 @Override
056 public <T> T get(Contextual<T> bean) {
057 return get(bean, null);
058 }
059
060 @Override
061 public <T> T get(Contextual<T> bean, CreationalContext<T> cc) {
062 if (!isActive())
063 throw new ContextNotActiveException();
064
065 if (bean == null)
066 throw new IllegalArgumentException("bean cannot be null");
067
068 String id = buildId(bean);
069 @SuppressWarnings("unchecked")
070 T instance = (T)getBeanCache().get(id);
071 if (instance != null)
072 return instance;
073
074 if (cc == null)
075 return null;
076
077 instance = bean.create(cc);
078 getBeanCache().put(id, instance);
079 getBeanCache().addResetter(id, new ViewBeanResetter<T>(bean, cc));
080
081 return instance;
082 }
083
084 private <T> String buildId(Contextual<T> contextual) {
085 return contextual.getClass().getName() + "#" + contextual.hashCode();
086 }
087
088 @Override
089 public Class<? extends Annotation> getScope() {
090 return ViewScoped.class;
091 }
092
093 @Override
094 public boolean isActive() {
095 return getBeanCache() != null;
096 }
097
098 public static class ViewBeanResetter<T> implements BeanResetter {
099
100 private final Contextual<T> bean;
101 private final CreationalContext<T> cc;
102
103 public ViewBeanResetter(Contextual<T> bean, CreationalContext<T> cc) {
104 this.bean = bean;
105 this.cc = cc;
106 }
107
108 @SuppressWarnings("unchecked")
109 public void reset(Object instance) {
110 bean.destroy((T)instance, cc);
111 }
112
113 }
114
115 }
116