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The "JEE-Annotation" page has been changed by LennyPrimak: http://wiki.apache.org/tapestry/JEE-Annotation?action=diff&rev1=4&rev2=5 Comment: added JNDIObjectLocator }}} + == JNDIObjectLocator.java, variant taken from Tapestry JumpStart == + + {{{ + import java.util.Collections; + import java.util.HashMap; + import java.util.Map; + import javax.naming.InitialContext; + import javax.naming.NameNotFoundException; + import javax.naming.NamingException; + import lombok.Getter; + import lombok.SneakyThrows; + + /** + * JNDIObjectLocator is used to centralize all JNDI lookups. It minimises the overhead of JNDI lookups by caching the + * objects it looks up. + * + * @author Geoff Callendar + * Enhancements by Lenny Primak + */ + public class JNDIObjectLocator + { + @SneakyThrows(NamingException.class) + public JNDIObjectLocator() + { + initialContext = new InitialContext(); + } + + + @SneakyThrows(NamingException.class) + public<T> T getObject(Class<T> beanClass) + { + String name = EJBAnnotationWorker.guessByType(beanClass.getName()); + return getObject(EJBAnnotationWorker.prependPortableName(name)); + } + + + @SuppressWarnings("unchecked") + public<T> T getObject(String jndiName) throws NamingException + { + return (T)getJNDIObject(jndiName); + } + + + public synchronized void clear() + { + jndiObjectCache.clear(); + } + + + public Object getJNDIObject(String jndiName) throws NamingException + { + Object jndiObject = jndiObjectCache.get(jndiName); + + if (jndiObject == null && !jndiObjectCache.containsKey(jndiName)) + { + try + { + jndiObject = lookup(jndiName); + jndiObjectCache.put(jndiName, jndiObject); + } catch (NamingException e) + { + clear(); + throw e; + } + } + return jndiObject; + } + + + private synchronized Object lookup(String name) throws NamingException + { + + // Recheck the cache because the name we're looking for may have been added while we were waiting for sync. + + if (!jndiObjectCache.containsKey(name)) + { + try + { + return getInitialContext().lookup(name); + } catch (NameNotFoundException e) + { + clear(); + throw e; + } + } else + { + return jndiObjectCache.get(name); + } + } + + + @Getter private final InitialContext initialContext; + private final Map<String, Object> jndiObjectCache = Collections.synchronizedMap(new HashMap<String, Object>()); + } + + }}} + --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tapestry.apache.org For additional commands, e-mail: dev-h...@tapestry.apache.org
