that way you get lazy injection and strongly typed pages.
so you would annotate getter functions with the @SpringBean annot, and the proxy would first call the getter ... if the getter returns null the proxy would then look for the setter and invoke the setter with the dependency, and then forward the call to the getter again.
sound like a good idea?
its not as elegant as being able to simply create the page and go, but it does give us the benefit of lazy dependency lookups and solves deserialization issues.
i guess of course if you want to use aop you can intercept new operator on a subclass of WebPage and do the wrapping automatically.
Or make the constructors of the page protected and create public static factory methods. MyPage page=MyPage.construct(user, securitycontext);
-Igor
On 11/7/05, Christian Essl <[EMAIL PROTECTED]> wrote:
Do you mean when you construct the page you do something like
MyPage page = (MyPage) wrapInProxy(new MyPage(..));
and wrapInProxy does create the Proxy and does all the injection?
On Mon, 7 Nov 2005 11:56:23 -0800, Igor Vaynberg < [EMAIL PROTECTED]>
wrote:
> yeah, i was thinking cglib and extract at runtime
> never used cglib before though
>
> that way you just wrap the page with the proxy after you create it and
> there
> is no need to worry about serialization/deserialiation garbage
>
> -Igor
>
>
> On 11/7/05, Christian Essl <[EMAIL PROTECTED] > wrote:
>>
>> The interface of the setter parameter or of the field type. Of course a
>> restriction. If you want more you could use cglib (or spring aop). Don't
>> know.
>>
>>
>>
>> On Mon, 7 Nov 2005 11:27:28 -0800, Igor Vaynberg
>> <[EMAIL PROTECTED]>
>> wrote:
>>
>> > what interface would you use for the proxy though?
>> > -Igor
>> >
>> >
>> > On 11/7/05, Christian Essl <[EMAIL PROTECTED]> wrote:
>> >>
>> >> Thanks for the clarification and sorry for the confusion. So
>> >> readObject()
>> >> as you have it in your code is fine.
>> >>
>> >> > To get the bean context i simply make my applicationbean implement
>> >> > applicationcontextaware and then i use
>> >> > ((MyApplication)Application.get()).getBeanContext() static lookup
>> >> which
>> >> > works because application object is always present.
>> >>
>> >> Still one question. The threadlocal used in Application.get() is set
>> at
>> >> the beginning of a request - on the request thread. I do not know but
>> >> maybe the deserialization of the session could happen outside of a
>> >> request
>> >> - even in a totally different thread?
>> >>
>> >> Maybe in readObject() a dynamic proxy could be injected which
>> triggers
>> >> on
>> >> first access the onInject() method.
>> >>
>> >> Christian
>> >>
>> >> >
>> >> > -Igor
>> >> >
>> >> >
>> >> > On 11/7/05, Christian Essl <[EMAIL PROTECTED]> wrote:
>> >> >>
>> >> >> On Mon, 7 Nov 2005 15:25:29 +0100, Johan Compagner
>> >> >> <[EMAIL PROTECTED]>
>> >> >> wrote:
>> >> >>
>> >> >> > And there is also a thing like XML Serialization
>> >> >> > Which also doesn't use the java read/write object at all.
>> >> >> >
>> >> >>
>> >> >> Does this mean that the readObject is guaranteed to be called on
>> Page
>> >> >> because it is serialized through the PageMap and is not a direct
>> >> session
>> >> >> attribute?
>> >> >>
>> >> >> I don't get realy clear with 'Serializable closure' in the spec:
>> >> >>
>> >> >> "Developers are not guaranteed that containers will call
>> readObject
>> >> and
>> >> >> writeObject methods on
>> >> >> session attributes if they implement them, but are guaranteed that
>> >> the
>> >> >> Serializable closure of their attributes will be preserved."
>> >> >>
>> >> >> And if readObject() gets called on Pages can I than acess somehow
>> the
>> >> >> ApplicationContext to get to the BeanContext?
>> >> >>
>> >> >> Please help.
>> >> >>
>> >> >> Thanks,
>> >> >> Christian
>> >> >>
>> >> >> >
>> >> >> > On 11/7/05, Christian Essl < [EMAIL PROTECTED]> wrote:
>> >> >> >>
>> >> >> >> Hi Igor,
>> >> >> >>
>> >> >> >> I looked through your code. Thanks for implementing it. I am
>> not
>> >> sure
>> >> >> >> wheter readObject() is the right place to do the (re)injection.
>> >> >> >> According
>> >> >> >> to the servlet-spec in SVR 7.7.2 readObject() is not guaranteed
>> to
>> >> be
>> >> >> >> called on session-attributes. (Instead session attributes which
>> >> >> >> implement
>> >> >> >> HttpSessionActiviationListeners are informed on
>> deserialization).
>> >> >> Even
>> >> >> >> if
>> >> >> >> readObject is called I am not sure wheter there is an
>> >> >> ApplicationContext
>> >> >> >> to get to the BeanContext.
>> >> >> >>
>> >> >> >> I don't know wheter wicket has a mean to propogate these
>> >> >> >> HttpSessionEvents
>> >> >> >> on deserialization or a similar callback? If so I guess you
>> could
>> >> do
>> >> >> the
>> >> >> >> (re)injection there.
>> >> >> >>
>> >> >> >> Christian
>> >> >> >>
>> >> >> >> On Mon, 7 Nov 2005 01:13:31 -0800, Igor Vaynberg
>> >> >> >> <[EMAIL PROTECTED]>
>> >> >> >> wrote:
>> >> >> >>
>> >> >> >> > here is something i threw together that solves the
>> >> deserialization
>> >> >> and
>> >> >> >> > ability to use the new operator to create pages. atleast i
>> think
>> >> it
>> >> >> >> > does....its really late here and all i really know so far is
>> >> that
>> >> >> it
>> >> >> >> > compiles :)
>> >> >> >> >
>> >> >> >> > the idea is pretty simple, do the injection in the default
>> >> >> >> constructor,
>> >> >> >> > and
>> >> >> >> > then do it anytime the object is deserialized. you use a
>> >> >> @SpringBean
>> >> >> >> > annotation to denote the dependency. it can either be used
>> on a
>> >> >> field
>> >> >> >> or
>> >> >> >> > on
>> >> >> >> > a setter. If you specify the bean name it will be used to
>> find
>> >> the
>> >> >> >> bean,
>> >> >> >> > if
>> >> >> >> > you dont then the field's type or the setters argument type
>> will
>> >> be
>> >> >> >> used
>> >> >> >> > for
>> >> >> >> > the lookup.
>> >> >> >> >
>> >> >> >> > -Igor
>> >> >> >> >
>> >> >> >> >
>> >> >> >> > On 11/7/05, Igor Vaynberg <[EMAIL PROTECTED]> wrote:
>> >> >> >> >>
>> >> >> >> >> and you have to have the pages defined as beans in the
>> >> application
>> >> >> >> >> context? with their properties specified?
>> >> >> >> >>
>> >> >> >> >> -Igor
>> >> >> >> >>
>> >> >> >> >>
>> >> >> >> >> On 11/7/05, Igor Vaynberg <[EMAIL PROTECTED] > wrote:
>> >> >> >> >> >
>> >> >> >> >> > but how does the above handle deserealization of pages?
>> there
>> >> is
>> >> >> >> >> nothing
>> >> >> >> >> > to reinject the dependencies.
>> >> >> >> >> >
>> >> >> >> >> > -Igor
>> >> >> >> >> >
>> >> >> >> >> >
>> >> >> >> >> > On 11/7/05, [EMAIL PROTECTED] < [EMAIL PROTECTED]> wrote:
>> >> >> >> >> > >
>> >> >> >> >> > > IMHO pages are standing on the borderline between a
>> >> stateful
>> >> >> GUI
>> >> >> >> and
>> >> >> >> >> > > the rest of the application in form of stateless
>> services.
>> >> >> >> >> > > DI should be done by the IoC container, creating the
>> pages
>> >> can
>> >> >> >> >> better
>> >> >> >> >> > > be done the standard Wicket way ( e.g. with
>> PageParameters).
>> >> >> >> >> > >
>> >> >> >> >> > > As described before I'm using a custom page factory that
>> >> >> >> cooperates
>> >> >> >> >> > > with a wrapped page factory and the containing bean
>> >> factory:
>> >> >> >> >> > >
>> >> >> >> >> > > public class SpringInjectingPageFactory implements
>> >> >> IPageFactory,
>> >> >> >> >> > > BeanFactoryAware {
>> >> >> >> >> > >
>> >> >> >> >> > > private AutowireCapableBeanFactory beanFactory;
>> >> >> >> >> > > private IPageFactory pageFactory;
>> >> >> >> >> > >
>> >> >> >> >> > > public void setPageFactory(IPageFactory pageFactory) {
>> >> >> >> >> > > this.pageFactory = pageFactory;
>> >> >> >> >> > > }
>> >> >> >> >> > >
>> >> >> >> >> > > public void setBeanFactory(BeanFactory beanFactory)
>> throws
>> >> >> >> >> > > BeansException {
>> >> >> >> >> > > this.beanFactory =
>> (AutowireCapableBeanFactory)beanFactory;
>> >> >> >> >> > > }
>> >> >> >> >> > >
>> >> >> >> >> > > public Page newPage(Class pageClass) {
>> >> >> >> >> > > Page page = this.pageFactory.newPage(pageClass);
>> >> >> >> >> > >
>> >> >> >> >> > > injectDependencies(page, pageClass.getName ());
>> >> >> >> >> > >
>> >> >> >> >> > > return page;
>> >> >> >> >> > > }
>> >> >> >> >> > >
>> >> >> >> >> > > public Page newPage(Class pageClass, PageParameters
>> >> >> parameters)
>> >> >> {
>> >> >> >> >> > > Page page = this.pageFactory.newPage(pageClass,
>> >> parameters);
>> >> >> >> >> > >
>> >> >> >> >> > > injectDependencies(page, pageClass.getName ());
>> >> >> >> >> > >
>> >> >> >> >> > > return page;
>> >> >> >> >> > > }
>> >> >> >> >> > >
>> >> >> >> >> > > private void injectDependencies(Page page, String
>> >> beanName) {
>> >> >> >> >> > > if (this.beanFactory.containsBean(beanName)) {
>> >> >> >> >> > > this.beanFactory.applyBeanPropertyValues (page,
>> beanName);
>> >> >> >> >> > > }
>> >> >> >> >> > > }
>> >> >> >> >> > > }
>> >> >> >> >> > >
>> >> >> >> >> > > Note that if you don't specify a name or id attribute
>> for
>> >> >> beans,
>> >> >> >> >> they
>> >> >> >> >> > > will be registered under their classname in Spring.
>> >> >> >> >> > > And NO, I don't use autowiring:
>> applyBeanPropertyValues()
>> >> does
>> >> >> >> not
>> >> >> >> >> > > autowire although it is located in
>> >> AutowireCapableBeanFactory.
>> >> >> >> >> > >
>> >> >> >> >> > > Sven
>> >> >> >> >> > >
>> >> >> >> >> > > >you are right, this is not ioc. but are
>> pages/components
>> >> >> managed
>> >> >> >> by
>> >> >> >> >> > > an ioc
>> >> >> >> >> > > >container?
>> >> >> >> >> > > >-Igor
>> >> >> >> >> > > >
>> >> >> >> >> > > >
>> >> >> >> >> > > >On 11/6/05, Alexandru Popescu <
>> >> >> >> >> [EMAIL PROTECTED]>
>> >> >> >> >> > > wrote:
>> >> >> >> >> > > >>
>> >> >> >> >> > > >> #: Igor Vaynberg changed the world a bit at a time by
>> >> >> saying
>> >> >> >> on
>> >> >> >> >> > > 11/6/2005
>> >> >> >> >> > > >> 7:06 PM :#
>> >> >> >> >> > > >> > Or how about a simple solution:
>> >> >> >> >> > > >> >
>> >> >> >> >> > > >> > public MyApplication extends WebApplication {
>> >> >> >> >> > > >> > public Object lookup(String name) {
>> >> >> >> >> > > >> > Object=...do a lookup from somewhere like spring
>> >> context
>> >> >> or
>> >> >> >> app
>> >> >> >> >> > > >> object...;
>> >> >> >> >> > > >> > return object;
>> >> >> >> >> > > >> > }
>> >> >> >> >> > > >> > }
>> >> >> >> >> > > >> >
>> >> >> >> >> > > >> > public MyPage extends Page {
>> >> >> >> >> > > >> > public transient SomeService service;
>> >> >> >> >> > > >> >
>> >> >> >> >> > > >> > public SomeService getService() {
>> >> >> >> >> > > >> > if (service==null) {
>> >> >> >> >> > > >> >
>> >> >> >> service=getApplication().lookup( SomeService.class.getName());
>> >> >> >> >> > > >> > }
>> >> >> >> >> > > >> > return service;
>> >> >> >> >> > > >> > }
>> >> >> >> >> > > >> >
>> >> >> >> >> > > >> > I know its not quiete as elegant as ioc but it has
>> >> none
>> >> >> of
>> >> >> >> the
>> >> >> >> >> > > >> performance
>> >> >> >> >> > > >> > hits an automatic injection would cause if it would
>> be
>> >> >> done
>> >> >> >> on
>> >> >> >> >> > > >> > deserialization of every component. Also its a lazy
>> >> >> lookup
>> >> >> >> so
>> >> >> >> >> you
>> >> >> >> >> > > dont
>> >> >> >> >> > > >> do it
>> >> >> >> >> > > >> > until its needed, and its only done once per page
>> >> (until
>> >> >> it
>> >> >> >> >> gets
>> >> >> >> >> > > >> > deserialized).
>> >> >> >> >> > > >> >
>> >> >> >> >> > > >> > -Igor
>> >> >> >> >> > > >> >
>> >> >> >> >> > > >>
>> >> >> >> >> > > >> But this was exactly what I was suggesting to avoid
>> ;-).
>> >> >> >> Lookups
>> >> >> >> >> > > and
>> >> >> >> >> > > >> factories are not ioc/di.
>> >> >> >> >> > > >>
>> >> >> >> >> > > >> ./alex
>> >> >> >> >> > > >> --
>> >> >> >> >> > > >> .w( the_mindstorm )p.
>> >> >> >> >> > > >>
>> >> >> >> >> > > >>
>> >> >> >> >> > > >>
>> >> >> >> >> > > >>
>> -------------------------------------------------------
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>> >> >> >> >> > >
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>> >> >> >> >> >
>> >> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >> --
>> >> >> >> Christian Essl
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >> ___________________________________________________________
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>> >> >>
>> >> >>
>> >> >>
>> >> >> --
>> >> >> Christian Essl
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >> ___________________________________________________________
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>> >>
>> >>
>> >>
>> >> --
>> >> Christian Essl
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> ___________________________________________________________
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>>
>>
>> --
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>>
>>
>>
>>
>>
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