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urlpatterns = patterns('', url(r'^add/( P<snippet_id>\d+)/$', bookmarks.add_bookmark, name='cab_bookmark_add'), url(r'^delete/( P<snippet_id>\d+)/$', bookmarks.delete_bookmark, name='cab_bookmark_delete'), ) Now that you ve got views in place for managing bookmarks, go ahead and write one to show a list of the current user s bookmarks. This is just a wrapper around the object_list generic view: from django.views.generic.list_detail import object_list def user_bookmarks(request): return object_list(queryset=Bookmark.objects.filter(user__pk=request.user.id), template_name='cab/user_bookmarks.html', paginate_by=20) You can set up a URL for the view so that the root of the bookmark URLs simply shows the user s bookmarks: url(r'^$', bookmarks.user_bookmarks, name='cab_user_bookmarks'), Finally, to round out the bookmark-oriented views, add one that queries for the most-bookmarked snippets. Because this query returns Snippet objects, place it on the SnippetManager in cab/managers.py: def most_bookmarked(self): return self.annotate(score=Count('bookmark')).order_by('score') Now write the most_bookmarked view in cab/views/popular.py: def most_bookmarked(request): return object_list(queryset=Snippet.objects.most_bookmarked(), template_name='cab/most_bookmarked.html', paginate_by=20) Then add the URL pattern in cab/urls/popular.py: url(r'^bookmarks/$', popular.most_bookmarked, name='cab_most_bookmarked'),

Each core object has a corresponding pointer to a UI operations object. This object contains function pointers that will be called when the UI needs to be notified of something. Figure 4-9 illustrates the relationship between these two types of objects.

Note This section will outline the tools available, but it will not provide specifics on how to resolve network latency issues. If any such issues occur, contact your network administrator for assistance.

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Figure 4-9. This diagram represents the relationship between a core object and a UI object. Here is the UI operations object for Gaim s file transfer support: typedef struct { void (*new_xfer)(GaimXfer *xfer); void (*destroy)(GaimXfer *xfer); void (*add_xfer)(GaimXfer *xfer); void (*update_progress)(GaimXfer *xfer, double percent); void (*cancel_local)(GaimXfer *xfer); void (*cancel_remote)(GaimXfer *xfer); } GaimXferUiOps; This object is contained as a member of the GaimXfer object. The UI object for file transfer, GaimGtkXfer calls a function gaim_ft_set_ui_ops() with a pointer to this struct: static GaimXferUiOps ops = { gaim_gtkxfer_new_xfer, gaim_gtkxfer_destroy, gaim_gtkxfer_add_xfer, gaim_gtkxfer_update_progress, gaim_gtkxfer_cancel_local, gaim_gtkxfer_cancel_remote };

creating a new template tag:

In this struct, each member is a pointer to functions that match the core prototypes. When a Gaim user, for example, cancels a file transfer, the core calls the cancel_local member of the UI operations, corresponding to gaim_gtkxfer_cancel_local(). This function notifies the user that the transfer was canceled by manipulating the appropriate GaimGtkXfer object. The GaimGtkXfer object corresponding to a GaimXfer is stored in GaimXfer in its ui_data data member. When the core calls its new_xfer UI operation, gaim_gtkxfer_new_xfer creates a new GaimGtkXfer object, and sets the GaimGtkXfer object as the GaimXfer s ui_data. For subsequent UI operation calls, the UI will be able to access the GaimGtkXfer from here.

There are several operating system commands that can be used for troubleshooting network issues. From the client experiencing problems, issuing commands such as ping or tracert can provide valuable information. The ping command will demonstrate whether the client has access to the node. Without access to the node, the user will be unable to access the Oracle E-Business Suite application. Assuming that the application is accessed through the URL https://vis.domain.com, the user must be able to access the address vis.domain.com. If access exists, the ping command should return the following: C:\> ping vis.domain.com Pinging vis.domain.com [127.0.0.1] with 32 bytes of data: Reply Reply Reply Reply from from from from 127.0.0.1: 127.0.0.1: 127.0.0.1: 127.0.0.1: bytes=32 bytes=32 bytes=32 bytes=32 time=39ms time=41ms time=38ms time=54ms TTL=53 TTL=53 TTL=53 TTL=53

{% if_bookmarked %}

Void pointers are pointers the compiler will allow to point to any data type. They are useful in situations Tip

in which different UIs will need to associate different data with a file transfer. They should not be abused, though, as strict typing will generally lead to fewer bugs.

Ping statistics for 127.0.0.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 38ms, Maximum = 54ms, Average = 43ms Some useful troubleshooting information is provided with the results of the ping command. If the output indicates that packets are lost, there may be network issues for that client. Also, if the reply times out or takes an abnormally long time, there may be network issues. If the ping command returns the following output, there may be a problem with your Domain Name System (DNS): C:\> ping vis.domain.com Ping request could not find host vis.domain.com. the name and try again. Please check

To go with the add_bookmark and delete_bookmark views, you might want to indicate when displaying a snippet whether a user has already bookmarked it. That way, you could either hide any links to bookmarking views you might otherwise show or switch to showing a link or button to delete the bookmark.

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