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Because Gaim conversations are tabbed, a GaimConversation will always exist inside a GaimConvWindow. A GaimConvWindow is essentially a linked list of GaimConversations, as shown in Figure 4-11. Because newly created conversations will automatically place themselves in a window, creating a new one if necessary, you will rarely deal with GaimConvWindows unless you re editing the conversation UI. UI aspects will be discussed in greater detail in the next chapter.

resolve(context) Each Variable instance has a method called resolve(), which handles the actual business of resolving the variable If the variable turns out not to correspond to anything, it ll even handle raising an exception djangotemplateVariableDoesNotExist automatically for you Of course, you ve seen that it s usually a good idea for custom template tags to fail silently when possible, so catch that exception and just have the tag return nothing when one of the variables is invalid: def render(self, context): try: user = selfuserresolve(context) snippet = selfsnippetresolve(context) except templateVariableDoesNotExist: return '' If you get past this point, then you know that these variables resolved successfully, and you can use them to query for an existing Bookmark The only tricky thing now is figuring out what to return in each case.

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The Applications DBA should set up monitoring for the database backups. If a failure occurs during the backup, the DBA should be notified so that the situation can be resolved in a timely manner. This monitoring process should be in place regardless of the backup methodology. Some systems benefit from exporting certain objects or schemas in addition to the regular backups. These exports can be monitored for error messages within their log files. Since backups are largely environment specific, we will not attempt to address how monitoring should occur, only that it should occur. In addition to monitoring backups, periodic restores from backups should be performed in order to confirm backup validity. Also verify that the time required to restore the instance falls within your service level agreement. This testing process should be part of your company s disaster recovery plan.

Figure 4-11. A GaimConvWindow holding two conversations from the same account The most important function for GaimConversations is gaim_conversation_write (which will probably be wrapped by gaim_conv_im_write or gaim_conv_chat_write, depending on the conversation type). This function will print a message to the conversation, taking such factors as the user s preferences and the type of conversation into consideration.

GaimBuddyList (blist.h)

You have two NodeList instances, and you want to render one or the other according to whether the user has bookmarked the snippet Fortunately, that s easy Just as a Node must have a render() method that accepts the context and returns a string, so too must NodeList: if Bookmarkobjectsfilter(user__pk=userid, snippet__pk=snippetid): return selfnodelist_truerender(context) else: return selfnodelist_falserender(context).

When users encounter problems running Forms applications on their workstations, the source of the problem may be JInitiator. Troubleshooting techniques for JInitiator include the following: Clearing the JAR cache Using the Java console

GaimBuddyList is somewhat unique in that only one exists for all of Gaim. It contains only two notable data members. The first is an object itself, a GaimBlistNode.

Now you have a finished tag. After you register it, cab/templatetags/snippets.py looks like this: from django import template from cab.models import Bookmark def do_if_bookmarked(parser, token): bits = token.contents.split() if len(bits) != 3: raise template.TemplateSyntaxError("%s tag takes two arguments" % bits[0]) nodelist_true = parser.parse(('else', 'endif_bookmarked')) token = parser.next_token() if token.contents == 'else': nodelist_false = parser.parse(('endif_bookmarked',)) parser.delete_first_token() else: nodelist_false = template.NodeList() return IfBookmarkedNode(bits[1], bits[2], nodelist_true, nodelist_false)

A GaimBlistNode is a recursive data structure containing pointers to other GaimBlistNode objects as to represent a tree, as shown in Figure 4-12. The GaimBlist contains a pointer to the first node of the tree. A GaimBlistNode object can represent a group, a buddy, a chat, or a GaimContact (discussed later in this section). As you saw earlier in this chapter, a GaimBlistNode contains very little data by itself mostly just references to other GaimBlistNodes. Most of the data comes from derived objects, such as GaimBuddy and GaimGroup, which inherit from GaimBlistNode. In fact, nowhere in Gaim is GaimBlistNode used apart from within a derived subclass.

Most JInitiator problems can be resolved by clearing the JAR cache for the program. This can be accomplished by selecting the Cache tab on the JInitiator Control Panel, shown in Figure 3-8, and clicking the Clear JAR Cache button.

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