@Dave,
Great!
Your explanation is very clear and in detail. It really helps me a lot.
I think I understand the overall process. : )
Thanks for your time.
Best regards,
Wuxia Jin
On Sat, Feb 24, 2018 at 3:02 PM, Dave <snoopd...@gmail.com> wrote:
> Hi Wuxia Jin,
>
> Some answers below...
>
>
> > The processing of an incoming request is right as what I said?
>
> Yes, that is mostly correct, but not all requests are handle by Struts.
>
> To understand how Roller works, you should also look at the web.xml file
> and how it maps URL paths to Java classes.
>
> Also, understand that there are two parts of Roller:
>
> 1) the weblog editor and admin interface, which exists at the URL path
> /roller-ui and is written using Struts and JSP pages (see the struts.xml
> and tiles.xml to see how Struts is configured) and
>
> 2) the Roller weblog page rendering system, which uses a set of Servlets
> which call the Velocity template engine to display weblog pages using
> Velocity templates.
>
> In the web.xml there is a RequestMapping filter. If that filter sees a
> request for a weblog page then it calls a servlet to display the weblog
> page or weblog RSS feed (using Velocity).
>
> If the RequestMapper does not handle a request, then the next filter, which
> is the Struts filter, will handle the request and determine which Struts
> action is to be called.
>
>
> > *2. From the structs, each "action" corresponds to a "action class".
> Aslo,
> > There is more than one action is processed by the same action class.*
> > If so, *how does execute() distinguish the two different actions to
> process
> differently?*
>
> The BookmarkEdit action is called twice.
>
> First, it is called with no method name specified in the URL and the
> execute() method returns INPUT, which tells struts to display the
> ".BookmarkEdit" Tile which includes the BookmarkEdit.jsp page. That causes
> the Bookmark Edit page to be displayed to the user.
>
> Second, when a user clicks the Save button then Bookmark edit action is
> called again but this time with the save method specified in the URL (by a
> !save notation). That means that the save() method gets called, and a new
> bookmark is added or an existing bookmark is updated.
>
>
> > (b) Another question is that, in class BookmarkEdit, there is "save()"
> > method besides "myPrepare()" and "execute()".
> > From the code,* I cannot clearly see how the save() method is called, or
> > who will call save() method?*
>
> Yes, that is confusing and sort of a hack. There is a form parameter that
> carries an action name of either "bookmarkAdd" or "bookmarkEdit" and there
> is a method called isAdd() which looks at that parameter and decides
> whether to add a new bookmark or update an existing bookmark.
>
> Hope that helps.
>
> Best regards,
> Dave
>
>
> On Sat, Feb 24, 2018 at 2:02 PM x86 wj <wj86...@gmail.com> wrote:
>
> > hi Greg,
> >
> > *1. According to your explanation, I try to express the request
> > processing. *
> > When a request comes in:
> > (1) Firstly, several filterings will filter the request.
> > (2) Then, as you said, WeblogRequestMapper is the overall entry for
> > processing all request. WeblogRequestMapper.handleRequest() will parse
> the
> > requesting url, then find the corresponding "Action name" to process the
> > request.
> > (3) After finding the "Action name", then corresponding Action Class will
> > really process the business function. while the mapping from "action
> name'
> > to "action class" is specified in Struts.xml.
> > (4) The 'Action class' will process the logic. It firstly runs
> > its myPrepare() method, then call the execution() method.
> > (5)After processing the execute() method, then continue the pass the
> > several filterings.
> >
> > The processing of an incoming request is right as what I said?
> >
> > *2. From the structs, each "action" corresponds to a "action class".
> Aslo,
> > There is more than one action is processed by the same action class.*
> > For example,
> >
> > <action name="bookmarkAdd"
> > class="org.apache.roller.weblogger.ui.struts2.editor.
> BookmarkEdit">
> > <param name="actionName">bookmarkAdd</param>
> > <param name="pageTitle">bookmarkForm.add.title</param>
> > <result name="input" type="tiles">.BookmarkEdit</result>
> > <result name="success" type="chain">bookmarks</result>
> > <result name="error" type="chain">bookmarks</result>
> > </action>
> >
> > <action name="bookmarkEdit"
> > class="org.apache.roller.weblogger.ui.struts2.editor.
> BookmarkEdit">
> > <param name="actionName">bookmarkEdit</param>
> > <param name="pageTitle">bookmarkForm.edit.title</param>
> > <result name="input" type="tiles">.BookmarkEdit</result>
> > <result name="success" type="chain">bookmarks</result>
> > <result name="cancel" type="redirectAction">
> > <param name="actionName">bookmarks</param>
> > <param name="weblog">${weblog}</param>
> > <param name="folderId">${folderId}</param>
> > </result>
> > <result name="error" type="chain">bookmarkEdit</result>
> > </action>
> >
> > (a) we can see "bookmarkAdd" and "bookmarkEdit' the two actions are both
> > processed by "org.apache.roller.weblogger.ui.struts2.editor.
> BookmarkEdit".
> > But there is only one execute() method in class BookmarkEdit. It means
> > "bookmarkAdd' and "bookmarkEdit" are processed by the same execution()
> > method?
> > If so, *how does execute() distinguish the two different actions to
> process
> > differently?*
> >
> > (b) Another question is that, in class BookmarkEdit, there is "save()"
> > method besides "myPrepare()" and "execute()".
> > From the code,* I cannot clearly see how the save() method is called, or
> > who will call save() method?*
> >
> >
> >
> > I am new to structs and roller. A lot of details I would like to ask and
> > hope make it clear.
> > Thank you for your help.
> > Best regards,
> > Wuxia Jin
> >
> >
> > On Sat, Feb 24, 2018 at 12:07 PM, Greg Huber <gregh3...@gmail.com>
> wrote:
> >
> > > .....should be WeblogRequestMapper
> > >
> > > Cheers Greg
> > >
> > > On 24 February 2018 at 04:39, x86 wj <wj86...@gmail.com> wrote:
> > >
> > > > Roller is in a web architecture of "presentation -> business logic ->
> > > > persistent layer". But the project is complex. From the source code,
> I
> > > have
> > > > no idea which packages(or classes) are responsible for the
> controller.
> > > The
> > > > following will list an example to express my meaning.
> > > >
> > > > For example, Jpetstore is a small project with only 24 classes.
> > > > https://github.com/mybatis/jpetstore-6/blob/master/src/
> > > > main/java/org/mybatis/jpetstore/web/actions/OrderActionBean.java
> > > >
> > > > This link shows that OrderActionBean is one of the controller class
> in
> > > > web.action package. OrderActionBean.listOrders is one function entry
> > > > provided by system.
> > > >
> > > > So, I would like to know, in roller,* where can I find the similar
> > > > 'controllerClass.method()' that clearly present function's entry*.
> Can
> > > you
> > > > give me some example?
> > > >
> > > > Thanks a lot for your time. I really need your help.
> > > > Best regards,
> > > > Wuxia Jin
> > > >
> > >
> >
>
