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From "Jiming Liu" <jiming...@gmail.com>
Subject Re: Interface binding
Date Thu, 06 Nov 2008 01:44:42 GMT
ibatis dynamic proxy

On Wed, Sep 10, 2008 at 5:06 AM, Ron Chan <rchan@i-tao.com> wrote:

>
> Here's a quick and dirty DynamicMapper I created
>
> MyDao myDao = dynamicMapper.daoProxy(MyDao.class)
> creates the proxy implementation
>
> I use Guice for DI and have a Guice provider for this and that makes it
> even
> simpler
>
> public class DynamicMapper {
>        private SqlMapClient sqlMap;
>
>        public void setSqlMap(SqlMapClient sqlMap) {
>                this.sqlMap = sqlMap;
>        }
>
>        public <T> T daoProxy(Class<T> clazz) {
>                InvocationHandler handler = new InvocationHandler() {
>                        @Override
>                        public Object invoke(Object proxy, Method method,
> Object[] args)
>                                        throws Throwable {
>                                Class<?> resultClazz =
> method.getReturnType();
>                                String methodName = method.getName();
>
>                                Object param = null ;
>                                if (args!=null) param = args[0];
>
>                                if (methodName.startsWith("insert")) {
>                                        return sqlMap.insert(methodName,
> param);
>                                }
>                                else if (methodName.startsWith("update")) {
>                                        return sqlMap.update(methodName,
> param);
>                                }
>                                else if (methodName.startsWith("delete")) {
>                                        return sqlMap.delete(methodName,
> param);
>                                }
>                                else if
> (java.util.List.class.isAssignableFrom(resultClazz)) {
>                                        return
> sqlMap.queryForList(methodName, param);
>                                }
>                                else if
> (java.util.Map.class.isAssignableFrom(resultClazz)) {
>                                        String key;
>                                        if (args.length==1) {
>                                                param = null;
>                                                key = (String)args[0];
>                                        }
>                                        else {
>                                                key = (String)args[1];
>                                        }
>                                        return
> sqlMap.queryForMap(methodName, param, key);
>                                }
>                                else {
>                                        return
> sqlMap.queryForObject(methodName, param);
>                                }
>                        }
>                };
>
>                return (T)Proxy.newProxyInstance(clazz.getClassLoader(),
>                                                             new Class[]
> {clazz},
>                                                             handler);
>        }
>
> }
>
>
>
> Ronald Borman wrote:
> >
> > I got started with iBATIS this week. I bought 'iBATIS in Action'
> > (finishing the last chapter tomorrow), did some tests and browsed through
> > the mailing lists. It looks like a compact, comprehensible and fun to use
> > framework. Kudos to the team!
> >
> > On the incubator mailing list I found a May 2005 announcement which
> caught
> > my attention: interface binding
> > (
> http://www.mail-archive.com/ibatis-user-java@incubator.apache.org/msg02403.html
> ).
> > It reminded me of an IBM DeveloperWorks article about Generic DAOs and I
> > was eager to try it out. Unfortunately SqlMapClientImpl.getMapper()
> hasn't
> > survived (although it is still listed in the online dev Javadoc).
> >
> > The 2.1.7 source code only calls the static method
> > MapperProxy.newMapperProxy(), so perhaps I could compile/externalize the
> > missing classes. Is this feasable?
> >
> > The 3.0 whiteboard discussion also mentions interface binding. Is it
> > likely that this functionality will return in a future version?
> >
> > Thanks
> >
> >
> > Ronald
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Interface-binding-tp19352392p19401342.html
> Sent from the iBATIS - User - Java mailing list archive at Nabble.com.
>
>

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