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Medium 9781449326111

6. Deploying Twisted Applications

Jessica McKellar O'Reilly Media ePub

Twisted is an engine for producing scalable, cross-platform network servers and clients. Making it easy to deploy these applications in a standardized fashion in production environments is an important part of a platform like this getting wide-scale adoption.

To that end, Twisted provides an application infrastructure: a reusable and configurable way to deploy a Twisted application. It allows a programmer to avoid boilerplate code by hooking an application into existing tools for customizing the way it is run, including daemonization, logging, using a custom reactor, profiling code, and more.

The application infrastructure has five main components: services, applications, TAC files, plugins, and the twistd command-line utility. To illustrate this infrastructure, well turn the echo server from Chapter2 into an application. Example6-1 reproduces the server code.

Example6-1.echoserver.py from Chapter2

A service is anything that can be started and stopped and that implements the IService interface. Twisted comes with service implementations for TCP, FTP, HTTP, SSH, DNS, and many other protocols. Many services can register with a single application.

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Medium 9780961470159

Chapter Thirteen: Fourth Chords

Music, SHER Sher Music ePub

Play figure 13-1 and listen to the sound of fourth chords. McCoy Tyner in the early 1960s was the first jazz pianist to play fourth chords extensively, although the Powell brothers, Bud and Ritchie, were playing them over a decade earlier. On Bud’s “So Sorry Please,”1 he can be heard not only playing fourth chords, but also voicing parts of the melody in parallel fourths (figure 13-2). “So Sorry Please” is also an early example of the use of pentatonic scales by a jazz musician (pentatonic scales will be covered in Chapter Fifteen). Bill Evans also played parallel fourths, as in the example shown from his version of Cy Coleman’s “See Saw” (figure 13-3).2 Kenny Barron plays a similar figure near the end of his version of Vernon Duke’s “Autumn In New York.”3 Bud Powell’s brother Ritchie can be heard playing fourth chords as he ‘comps behind Clifford Brown and Harold Land on Bud’s “Parisian Thoroughfare.”4

Figure 13-1

Figure 13-2

Figure 13-3

Play the chord shown in figure 13-4, a voicing for a C 6/9 chord. From the bottom up, it consists of the third, sixth, ninth, fifth, and root. It’s much easier to “see,” however, as a series of perfect fourths with the third of the chord on the bottom and the root on the top. Learn this major 6/9 voicing by practicing it around the cycle of fifths. Figure 13-5 shows fourth voicings extended diatonically all the way up the C major scale. Most of the voicings include a tritone, rather than just perfect fourths. If you’re playing a modal tune like “So What,” “Little Sunflower,” or “Impressions,” you might want to play some or all of these voicings while you’re ‘comping or soloing, to create some tension in what is otherwise very unchanging harmony.

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Medium 9780253010223

Baroque

Maurice Hinson Indiana University Press ePub

 

This section is divided into multiple groupings, each arranged alphabetically by title. Anthologies and collections grouped into historical periods include music from different countries written over one to three centuries. The “Tombeaux, Hommages” section catalogs those collections written in honor of a composer. The last and largest category consists of collections of various nationalities, sometimes divided into pre-twentieth century and twentieth century. The “Bach” section (under “German”) lists collections which include music by more than one member of the Bach family. Single-composer collections are listed under the composer's name in the main part of the book.

Initial articles and Arabic numerals (A, An, Das, Der, I, Le, Les, The, 15, 24, 30) are ignored in alphabetization. Composers’ names are given in the spelling used in the collection being described. The Title Index of Anthologies and Collections at the end of the volume lists all the collections in one alphabetic sequence. Only dates for composers not included earlier are included here.

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Medium 9781449364915

9. Human Resource Management: Getting the team together

Jennifer Greene O'Reilly Media ePub

Behind every successful project is a great team. So how do you make sure that you getand keepthe best possible team for your project? You need to plan carefully, set up a good working environment, and negotiate for the best people you can find. But its not enough to put a good team together...if you want your project to go well, youve got to keep the team motivated and deal with any conflicts that happen along the way. Human resource management gives you the tools you need to get the best team for the job and lead them through a successful project.

Cows Gone Wild III was a huge success! But now the Ranch Hand Games team is gearing up for their next big hit. How are things shaping up?

Brian: Yeah, theres no reason you need our resources dedicated to your project. We can get multiple projects done that way.

Mike: Come on, guys. You dont really think thats gonna work, do you?

Amy: Sure, why not?

Mike: We cant just staff up as we go; thats going to cause huge problems.

Brian: Youre overreacting, Mike. Look, Im a team player, and I want to get the project done. You just tell me when you need someone off my team, and Ill make sure youve got the developers and testers you need. Whats wrong with that?

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Medium 9781576336939

Factoring Polynomials: PSAT Algebra

Ace Academics Ace Academics ePub

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