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In 1997, a student named Miguel de Icaza announced his intention to create an entirely free and open source integrated desktop environment for the UNIX environment. A desktop environment is the collection of integrated tools and applications that comprise the desktop user experience. Some operating systems, notably Windows and Mac OS, obscure the difference between the desktop environment and the operating system. Due to UNIX s more modular structure, though, a relatively wide choice is available. At the time the most promising such desktop, KDE, was not free because it used the proprietary Qt widget toolkit, which did not offer its users the ability to modify or redistribute the toolkit.1 Miguel de Icaza attempted to convince Trolltech, the creators of Qt, to consider a free software license. Unable to do so, he created the GNOME project. The GNOME desktop is shown in Figure 5-2. One of the major advantages to the open source development model is that the community at large benefits from the work of others in the community. Because Peter Mattis and Spencer Kimball created a free toolkit for their needs, de Icaza was able to use it in his own free software projects. Currently, Miguel de Icaza s desktop environment, GNOME, is the most prevalent use of the GTK+ library, and development of GTK+ falls under the realm of the GNOME project.

Letting users rate snippets is pretty easy. All you need is a view that gets a snippet ID and an up or down rating, then adds a new Rating object. The view logic is simple. Create one more view file cab/views/ratings.py and place this code in it: from from from from django.http import HttpResponseRedirect django.shortcuts import get_object_or_404 django.contrib.auth.decorators import login_required cab.models import Rating, Snippet

1. Qt has since been relicensed under the GNU General Public License. Thus, KDE is now entirely free.

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his chapter will focus on performance tuning techniques for many of the components of the Oracle E-Business Suite. In the course of reading this chapter, you will become familiar with various tools that will enable you to diagnose and fix performance degradation problems. The two main sections of this chapter focus on the process and tools for performance tuning: Performance tuning process: The Applications DBA must identify and document the cause of performance degradation, and then develop an action plan for implementing a solution. This section will outline the steps in this process. Tools for resolving performance issues: This section will discuss several tools that can be used to tune the database and the server and provide tips for tuning Forms, Apache, JServ, and Concurrent Manager. Information for client tuning, generating and analyzing trace files, and some of the new features of Oracle10g for SQL statement tuning, will also be covered. There are numerous books dedicated to the subject of performance tuning. This chapter is not meant to provide intricate details for in-depth performance tuning; however, it will provide an overview of the information required for identifying and resolving performance issues.

def rate(request, snippet_id): snippet = get_object_or_404(Snippet, pk=snippet_id) if 'rating' not in request.GET or request.GET['rating'] not in ('1', '-1'): return HttpResponseRedirect(snippet.get_absolute_url()) try: rating = Rating.objects.get(user__pk=request.user.id, snippet__pk=snippet.id) except Rating.DoesNotExist: rating = Rating(user=request.user, snippet=snippet) rating.rating = int(request.GET['rating']) rating.save() return HttpResponseRedirect(snippet.get_absolute_url()) rate = login_required(rate)

GTK+ is a fairly high-level library that delegates lower-level functionality such as drawing to the screen or rendering text to other support libraries that operate closer to the system being run on. These libraries are developed alongside GTK+, and although they can be used separately from GTK+, they are most useful in the context of a GTK+ application and can be thought of as part of GTK+ for most purposes. This chapter will focus primarily on GTK+ itself. In the following few sections, I will provide only a brief introduction to what these libraries are and what they are used for. In the next chapter, I ll explore the internals of GTK+, and these libraries will be examined in greater depth.

GDK is the GTK+ Graphics Development Kit and is responsible for drawing GUI elements to the screen. It provides functions for drawing graphics to the screen; receiving input from the user from the keyboard, mouse, and other input devices; and system-independent methods of accessing interoperability features such as drag and drop and copy and paste. To allow GTK+ to be platform-independent, GDK consists of an assortment of different back ends, each of which knows how to work with a different system. The most commonly used back ends are X, which draws to the X Window System used by most UNIX-like computers and Win32, which draws to Windows.

Note Tuning may also be performed on SQL statements and the networking and I/O components of Oracle Applications; however, an extensive discussion of these sorts of tuning is beyond the scope of this guide.

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