luz2/src/com/lavans/luz2/util/BeanManager.java

   1 package com.lavans.luz2.util;\r
   2 \r
   3 import java.util.Map;\r
   4 import java.util.concurrent.ConcurrentHashMap;\r
   5 \r
   6 import javax.xml.xpath.XPathExpressionException;\r
   7 \r
   8 import org.apache.commons.logging.Log;\r
   9 import org.apache.commons.logging.LogFactory;\r
  10 import org.w3c.dom.Element;\r
  11 import org.w3c.dom.Node;\r
  12 import org.w3c.dom.NodeList;\r
  13 \r
  14 import com.lavans.luz2.commons.StringUtils;\r
  15 \r
  16 /**\r
  17  * Service Manager Implementation for XML file(default).\r
  18  * @author dobashi\r
  19  *\r
  20  */\r
  21 public class BeanManager {\r
  22         /** logger */\r
  23         private static final Log logger = LogFactory.getLog(BeanManager.class);\r
  24 \r
  25         /**  */\r
  26         private static Map<String, String> packageNameMap = new ConcurrentHashMap<String, String>();\r
  27         /** cache of all service */\r
  28         private static Map<String, BeanInfo> beanMap =  new ConcurrentHashMap<String, BeanInfo>();\r
  29 \r
  30         private BeanManager(){\r
  31         }\r
  32 \r
  33         static{\r
  34                 load("luz2.xml");\r
  35         }\r
  36 \r
  37         /** initialize */\r
  38         public static void load(String filename){\r
  39                 //packageNameMap.clear();\r
  40                 beanMap.clear();\r
  41                 Config config = Config.getInstance(filename);\r
  42                 try {\r
  43                         // package map\r
  44                         NodeList packageList = config.getNodeList("/root/beans");\r
  45                         for(int i=0; i<packageList.getLength(); i++){\r
  46                                 Element node = (Element)packageList.item(i);\r
  47                                 String group = node.getAttribute("group");\r
  48                                 String packageName = node.getAttribute("package");\r
  49                                 packageNameMap.put(group, packageName);\r
  50                         }\r
  51 \r
  52                         // bean map\r
  53                         NodeList nodeList = config.getNodeList("//bean");\r
  54                         for(int i=0; i<nodeList.getLength(); i++){\r
  55                                 Element node = (Element)nodeList.item(i);\r
  56                                 Node parent = node.getParentNode();\r
  57                                 BeanInfo bean = new BeanInfo();\r
  58                                 bean.id = node.getAttribute("id");\r
  59                                 bean.className = node.getAttribute("class");\r
  60                                 // beanのgroup指定なら\r
  61                                 if(parent.getNodeName().equals("beans")){\r
  62                                         bean.group = node.getAttribute("group");\r
  63                                         bean.packageName = node.getAttribute("package");\r
  64                                         // add package info to id & className\r
  65                                         if(!StringUtils.isEmpty(bean.packageName)){\r
  66                                                 bean.id        = bean.packageName +"."+ bean.id;\r
  67                                                 bean.className = bean.packageName +"."+ bean.className;\r
  68                                         }\r
  69                                 }\r
  70                                 beanMap.put(bean.id, bean);\r
  71                         }\r
  72                 } catch (XPathExpressionException e) {\r
  73                         logger.error("Unable to find /lremote/service_base_path");\r
  74                 }\r
  75         }\r
  76 \r
  77         /**\r
  78          * get bean class. パッケージ指定有り\r
  79          * @param name\r
  80          * @param id\r
  81          * @return\r
  82          */\r
  83         public static Class<? extends Object> getBeanClass(String group, String id){\r
  84                 return getBeanClass(toFullId(group, id));\r
  85         }\r
  86 \r
  87         /**\r
  88          * beanのreflectionクラスを返す。\r
  89          * @param id\r
  90          * @return\r
  91          */\r
  92         public static Class<? extends Object> getBeanClass(String id) {\r
  93                 // Get FQDN bean info\r
  94                 BeanInfo bean = getBeanInfo(id);\r
  95 \r
  96                 return bean.getClazz();\r
  97         }\r
  98 \r
  99         /**\r
 100          * get bean instance. パッケージ指定有り\r
 101          * @param name\r
 102          * @param id\r
 103          * @return\r
 104          */\r
 105         public static Object getBean(String group, String id){\r
 106                 return getBean(toFullId(group, id));\r
 107         }\r
 108 \r
 109         /**\r
 110          * beanのsingletonインスタンスを返す\r
 111          * @param id\r
 112          * @return\r
 113          */\r
 114         @SuppressWarnings("unchecked")\r
 115         public static <T> T getBean(Class<T> clazz) {\r
 116                 // Get FQDN bean info\r
 117                 BeanInfo bean = getBeanInfo(clazz.getName());\r
 118 \r
 119                 // now support only singleton\r
 120                 return (T)bean.getInstance();\r
 121         }\r
 122         /**\r
 123          * beanのsingletonインスタンスを返す\r
 124          * @param id\r
 125          * @return\r
 126          */\r
 127         public static Object getBean(String id) {\r
 128                 // Get FQDN bean info\r
 129                 BeanInfo bean = getBeanInfo(id);\r
 130 \r
 131                 // now support only singleton\r
 132                 return bean.getInstance();\r
 133         }\r
 134 \r
 135         public static String toFullId(String group, String id){\r
 136                 String packageName = packageNameMap.get(group);\r
 137                 if(!StringUtils.isEmpty(packageName)){\r
 138                         id = packageName+"."+id;\r
 139                 }\r
 140                 return id;\r
 141         }\r
 142 \r
 143         private static BeanInfo getBeanInfo(String id) {\r
 144                 // Get FQDN bean info\r
 145                 BeanInfo bean = beanMap.get(id);\r
 146                 if(bean==null){\r
 147                         // if id is not defined in config file then id is className\r
 148                         bean = new BeanInfo();\r
 149                         bean.id=bean.className=id;\r
 150                         beanMap.put(id, bean);\r
 151                 }\r
 152                 return bean;\r
 153         }\r
 154 \r
 155 }\r
 156 \r
 157 class BeanInfo{\r
 158         /** logger */\r
 159         private static final Log logger = LogFactory.getLog(BeanInfo.class);\r
 160         /** parent group info */\r
 161         public String group;\r
 162         public String packageName;\r
 163         /** bean info */\r
 164         public String id;\r
 165         public String className;\r
 166         public String initMethod;\r
 167         private Class<? extends Object> clazz=null;\r
 168         private Object instance=null;\r
 169         /**\r
 170          * Classクラスを返す。一度読み込んだらキャッシュして再利用。\r
 171          * @return\r
 172          */\r
 173         public Class<? extends Object> getClazz(){\r
 174                 if(clazz!=null){\r
 175                         return clazz;\r
 176                 }\r
 177 \r
 178                 // load from ClassLoader\r
 179                 try {\r
 180                         clazz = Class.forName(className);\r
 181                 } catch (ClassNotFoundException e) {\r
 182                         logger.error("bean class is not found["+ className +"]", e);\r
 183                 }\r
 184 \r
 185                 return clazz;\r
 186         }\r
 187         /**\r
 188          * instanceを返す。一度読み込んだらキャッシュして再利用。\r
 189          * @return\r
 190          */\r
 191         public Object getInstance(){\r
 192                 if(instance!=null){\r
 193                         return instance;\r
 194                 }\r
 195 \r
 196                 // load from ClassLoader\r
 197                 try {\r
 198                         instance = getClazz().newInstance();\r
 199                 } catch (Exception e) {\r
 200                         logger.error("Bean instance cannot created ["+ className +"]", e);\r
 201                 }\r
 202 \r
 203                 if(!StringUtils.isEmpty(initMethod)){\r
 204                         try {\r
 205                                 clazz.getMethod(initMethod, (Class<?>[])null).invoke(instance, (Object[])null);\r
 206                         } catch (Exception e) {\r
 207                                 logger.error("init method call error ["+ className +"#"+ initMethod +"()]", e);\r
 208                         }\r
 209                 }\r
 210 \r
 211                 return instance;\r
 212         }\r
 213 \r
 214         /**\r
 215          * override toString().\r
 216          */\r
 217         @Override\r
 218         public String toString() {\r
 219                 return "BeanInfo [group=" + group + ", packageName=" + packageName\r
 220                                 + ", id=" + id + ", className=" + className + ", initMethod="\r
 221                                 + initMethod + ", clazz=" + clazz + ", instance=" + instance\r
 222                                 + "]";\r
 223         }\r
 224 }\r
 225 \r