cppcms-users

[Cppcms-users] Post-attach/add hook in cppcms::application

[Joerg S. <jo...@br...>]

Hi all,
I find myself with the need of running some actions outside the
constructor of a sub-application, because virtual methods are involved
or because it needs some data from the root of the hierachy. Would it
make sense to provide a callback after mount succeeded?

Joerg

Re: [Cppcms-users] Post-attach/add hook in cppcms::application

[Artyom B. <art...@ya...>]

See, mount does not actually create any instance. When you mount an application you provide a factory object.

http://cppcms.com/cppcms_ref/latest/structcppcms_1_1applications__pool_1_1factory.html

There are ready factories based on templates, but nothing prevents from you to implementing your own
factories and doing what ever you like, including running some post construction configurations etc.

Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/

--------------------------------------------
On Thu, 2/27/14, Joerg Sonnenberger <jo...@br...> wrote:

 Subject: [Cppcms-users] Post-attach/add hook in cppcms::application
 To: cpp...@li...
 Date: Thursday, February 27, 2014, 3:15 AM
 
 Hi all,
 I find myself with the need of running some actions outside
 the
 constructor of a sub-application, because virtual methods
 are involved
 or because it needs some data from the root of the hierachy.
 Would it
 make sense to provide a callback after mount succeeded?

 
 Joerg
 
 ------------------------------------------------------------------------------
 Flow-based real-time traffic analytics software. Cisco
 certified tool.
 Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow
 Analyzer
 Customize your own dashboards, set traffic alerts and
 generate reports.
 Network behavioral analysis & security monitoring.
 All-in-one tool.
 http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
 _______________________________________________
 Cppcms-users mailing list
 Cpp...@li...
 https://lists.sourceforge.net/lists/listinfo/cppcms-users
 

Re: [Cppcms-users] Post-attach/add hook in cppcms::application

[Joerg S. <jo...@br...>]

On Tue, Mar 04, 2014 at 11:07:12PM -0800, Artyom Beilis wrote:
> See, mount does not actually create any instance. When you mount an
> application you provide a factory object.

But I am looking at cppcms::application::add and
cppcms::application::attach. Both take application instances, not
factory classes.

Joerg

Re: [Cppcms-users] Post-attach/add hook in cppcms::application

[Artyom B. <art...@ya...>]

The factory is provided for the topmost application in hierarchy.

How it works.

You define an application A at mount point /foo/bar
The A has subapplications b & c, while c has sub applications d and e

Tree:

  A
  /\
b  c
    /\
  d  e

Now when the factory object is requested, the ENTIRE should usually be created and stored in the pool. i.e. pool may own several A's which are actually roots of multiple trees.

You can build a tree in a constructor or in a method that is called by the factory.

The idea is that once the application (tree) is created the URL dispatcher would know how to route the relevant requests.
Of course when you "add" or "attach" a child to a tree you can call any his members you want before or after add/attach

I hope it is clear now.

Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/

--------------------------------------------
On Thu, 3/6/14, Joerg Sonnenberger <jo...@br...> wrote:

 Subject: Re: [Cppcms-users] Post-attach/add hook in cppcms::application
 To: cpp...@li...
 Date: Thursday, March 6, 2014, 1:11 AM
 
 On Tue, Mar 04, 2014 at 11:07:12PM
 -0800, Artyom Beilis wrote:
 > See, mount does not actually create any instance. When
 you mount an
 > application you provide a factory object.
 
 But I am looking at cppcms::application::add and
 cppcms::application::attach. Both take application
 instances, not
 factory classes.
 
 Joerg
 
 ------------------------------------------------------------------------------
 Subversion Kills Productivity. Get off Subversion & Make
 the Move to Perforce.
 With Perforce, you get hassle-free workflows. Merge that
 actually works. 
 Faster operations. Version large binaries.  Built-in
 WAN optimization and the
 freedom to use Git, Perforce or both. Make the move to
 Perforce.
 http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk
 _______________________________________________
 Cppcms-users mailing list
 Cpp...@li...
 https://lists.sourceforge.net/lists/listinfo/cppcms-users
 

Re: [Cppcms-users] Post-attach/add hook in cppcms::application

[Joerg S. <jo...@br...>]

On Thu, Mar 06, 2014 at 02:35:59AM -0800, Artyom Beilis wrote:
> The factory is provided for the topmost application in hierarchy.
> 
> How it works.
> 
> You define an application A at mount point /foo/bar
> The A has subapplications b & c, while c has sub applications d and e
> 
> Tree:
> 
>   A
>   /\
> b  c
>     /\
>   d  e
> 
> Now when the factory object is requested, the ENTIRE should usually be created and stored in the pool. i.e. pool may own several A's which are actually roots of multiple trees.
> 
> You can build a tree in a constructor or in a method that is called by the factory.
> 
> The idea is that once the application (tree) is created the URL dispatcher would know how to route the relevant requests.
> Of course when you "add" or "attach" a child to a tree you can call any his members you want before or after add/attach

I understand and this is what I am doing. My question is whether the
boilerplate code can be reduced by making the application class itself
provide such a callback.

Before:

   auto app = new child_app();
   attach(app, ...);
   app->initialize();

With a cppcms::application providing such a hook directly:

  attach(new child_app(), ...);

and attach calls the initialize() at the end. It's boring, repeative
code.

Joerg

Re: [Cppcms-users] Post-attach/add hook in cppcms::application

[Artyom B. <art...@ya...>]

you can always create a base class for all your applications derived from cppcms::application that would implement this functionality.

Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/

--------------------------------------------
On Thu, 3/6/14, Joerg Sonnenberger <jo...@br...> wrote:

 Subject: Re: [Cppcms-users] Post-attach/add hook in cppcms::application
 To: cpp...@li...
 Date: Thursday, March 6, 2014, 3:53 PM
 
 On Thu, Mar 06, 2014 at 02:35:59AM
 -0800, Artyom Beilis wrote:
 > The factory is provided for the topmost application in
 hierarchy.
 > 
 > How it works.
 > 
 > You define an application A at mount point /foo/bar
 > The A has subapplications b & c, while c has sub
 applications d and e
 > 
 > Tree:
 > 
 >   A
 >   /\
 > b  c
 >     /\
 >   d  e
 > 
 > Now when the factory object is requested, the ENTIRE
 should usually be created and stored in the pool. i.e. pool
 may own several A's which are actually roots of multiple
 trees.
 > 
 > You can build a tree in a constructor or in a method
 that is called by the factory.
 > 
 > The idea is that once the application (tree) is created
 the URL dispatcher would know how to route the relevant
 requests.
 > Of course when you "add" or "attach" a child to a tree
 you can call any his members you want before or after
 add/attach
 
 I understand and this is what I am doing. My question is
 whether the
 boilerplate code can be reduced by making the application
 class itself
 provide such a callback.
 
 Before:
 
    auto app = new child_app();
    attach(app, ...);
    app->initialize();
 
 With a cppcms::application providing such a hook directly:
 
   attach(new child_app(), ...);
 
 and attach calls the initialize() at the end. It's boring,
 repeative
 code.
 
 Joerg
 
 ------------------------------------------------------------------------------
 Subversion Kills Productivity. Get off Subversion & Make
 the Move to Perforce.
 With Perforce, you get hassle-free workflows. Merge that
 actually works. 
 Faster operations. Version large binaries.  Built-in
 WAN optimization and the
 freedom to use Git, Perforce or both. Make the move to
 Perforce.
 http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk
 _______________________________________________
 Cppcms-users mailing list
 Cpp...@li...
 https://lists.sourceforge.net/lists/listinfo/cppcms-users
 

Re: [Cppcms-users] Post-attach/add hook in cppcms::application

[Joerg S. <jo...@br...>]

On Thu, Mar 06, 2014 at 08:00:27AM -0800, Artyom Beilis wrote:
> you can always create a base class for all your applications derived
> from cppcms::application that would implement this functionality.

None of mount, attach, add is virtual, so the natural ways to implement
it don't work.

Joerg