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You ll recall from 6 when you wrote your first custom template tags that the compilation function for a tag receives two arguments, conventionally called parser and token. At the time, you were concerned only with the token portion because it contained the arguments you were interested in. However, now you re in a situation where parser which is the actual object that s parsing the template is going to come in handy. Before diving in too deeply, let s go ahead and lay out the infrastructure for the custom tag. In the cab directory, create a new directory called templatetags, and in that directory, create two new files: __init__.py and snippets.py. Then, open up cab/templatetags/ snippets.py and fill in a couple of necessary imports: from django import template from cab.models import Bookmark

GaimConnection represents a GaimAccount s connection to an IM server, and is manipulated mostly by protocol plug-ins. A GaimConnection is associated with exactly one GaimAccount, and a GaimAccount can support only one GaimConnection, as demonstrated in Figure 4-10.

Oracle Applications also provides a Network Trace Form that the user may execute. This form is accessed by logging in to the application and choosing the Application Network Test menu option. Click the Run Test button, and the Form will return information about network latency and bandwidth. The number of iterations and trails can be customized for each execution of the test. A sample of the output is shown in Figure 3-6.

Figure 4-10. The relationship between GaimAccount and GaimConnection When a protocol plug-in is told to connect a GaimAccount, it will create a new GaimConnection by calling GaimConnection *gc = gaim_connection_new(GaimAccount *account);

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Now, you can start writing the compilation function for the {% if_bookmarked %} tag: def do_if_bookmarked(parser, token): bits = tokencontentssplit() if len(bits) != 3: raise templateTemplateSyntaxError("%s tag takes two arguments" % bits[0]) This compilation function looks at the syntax used to call the tag which is of the form {% if_bookmarked user snippet %} and verifies that it has the right number of arguments, bailing out immediately with a TemplateSyntaxError if it doesn t Now you can turn your attention to the parser argument and see how it can help you out You want to read ahead in the template until you find either an {% else %} or an {% endif_ bookmarked %} tag You can do just that by calling the parse() method of the parser object and passing a list of things you d like it to look for.

When developing large applications, you ll often find that you wind up giving certain objects the same Tip

Figure 3-6. Forms network test This information can be used by your company s or customer s networking team to determine whether networking bottlenecks exist.

variable names repeatedly. This turns into a variable naming convention that can easily identify the type of an object from its variable name. If you see a variable called gc in Gaim, for example, it s almost always a GaimConnection.

The result of this parsing will be an instance of the class djangotemplateNodeList, which is as the name implies a list of template nodes: nodelist_true = parserparse(('else', 'endif_bookmarked')) You re storing this result in a variable called nodelist_true because in terms of this tag s if/else-style behavior it corresponds to the output you want to display if the condition is true (if the user has bookmarked the snippet) The call to parserparse() moves ahead in the template to just before the first item in the list you told it to look for This means you now want to look at the next token and find out if it s an {% else %} If it is, you ll need to do a bit more parsing: token = parsernext_token() if tokencontents == 'else': nodelist_false = parserparse(('endif_bookmarked',)) parserdelete_first_token() else: nodelist_false = template.

It will then use functions such as gaim_connection_set_state() and gaim_connection_disconnect() to keep Gaim informed of the status of this connection. The protocol plug-in contains a set of functions that Gaim will call when communication with the server is necessary (sending messages, adding buddies, sending files, etc.). These functions will all take a GaimConnection as a parameter. GaimConnection also contains a proto_data member (as a void pointer) in which the plug-in can store protocol-specific data. Protocol plug-ins will be explained in detail in 8.

This section will cover some miscellaneous monitoring and troubleshooting issues: Monitoring profile changes, which may assist with troubleshooting configuration issues Monitoring and validating system backups Troubleshooting JInitiator issues such as deleting the cache and using the Java console

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