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Updated Feb 04, 2010 by taday...@gmail.com
Labels: 翻訳完了
  18_starbucks  
スターバックスは2フェーズコミットを使わない

スターバックスは2フェーズコミットを使わない

(原文) http://www.eaipatterns.com/ramblings/18_starbucks.html

2004年11月19日

ホットココア ヲ クダサーイ (Hotto Cocoa o Kudasai)

2週間の日本旅行から帰ってきた。日本で見られる有名な景色の1つに、ありえない数のスターバックス・コーヒーショップがある。とくに、新宿と六本木がすごいことになっている。注文した「ホットココア」を待っている間に、スターバックスでどのように飲み物の注文が処理されているのかを考えてみた。スターバックスは、他のビジネスだってみんな同じだけれど、注文のスループット(処理量)を最大化することを第一に考えている。注文が多ければ多いほど、儲かるからだ。その結果、スターバックスは非同期処理をやる。お客が注文をすると、レジの店員はコーヒーカップに注文の印を付けて、キューに送る。キューというのは、エスプレッソマシンの上に一列に並んだ、文字通りコーヒーカップのキュー(待ち行列)だ。このキューはレジ係とバリスタ 訳注1 とを分割し、バリスタが一時的にモタモタしたとしてもレジ係は注文を受け続けることができる。この方法なら、もしお店が忙しくなっても、Competing Consumer のシナリオのようにバリスタを複数人配置して捌くことだってできる。

訳注1: コーヒーを淹れる人

相関関係 (Correlation)

非同期なアプローチから利益を得る代償に、スターバックスは同じく非同期性が本質的に持ち込んでしまう課題にも対処しなければならない。その一例が、相関関係(correlation)だ。飲み物の注文は、必ずしもその注文を受けた順番に完了するとは限らない。順序の入れ替わりは、2つの理由により起こりうる。まず、バリスタが複数人いて、別々の装置を使って注文を処理していることもある。ブレンドして作られる飲み物は、ドリップコーヒーより時間が掛かるかもしれない。二番目に、バリスタが処理時間を最適化するために、バッチ処理で飲み物を何個かまとめて作るかもしれない。その結果、スターバックスは相関関係の問題をかかえる。飲み物はばらばらの順序で手渡されるので、正しい客との対応付けが必要になるのだ。スターバックスはこの問題を、私たちがメッセージングアーキテクチャで用いるのと同じ「パターン」によって解決している――彼らは Correlation Identifier を使っている。米国のほとんどのスターバックスでは、カップにお客さんの名前を書いて、飲み物が出来上がったら名前を呼ぶ。そうやって、明示的に相関関係識別子(correlation identifier)を使っている。その他の国では、お客が飲み物の種類から相関を判断しなければならない。

例外処理 (Exception Handling)

非同期メッセージングのシナリオの中で、例外処理を考えるのは難しい。もし現実世界の中に最善のストーリーが描かれているとするなら、スターバックスがどうやって例外に対応しているかを観察することで、何かを学べるかもしれない。もしお客がお金を払えなかったら、スターバックスはどう対応するか? 飲み物がすでに出来上がっていたら捨ててしまうだろうし、まだだったらカップを「キュー」から戻すだろう。もし間違った飲み物を出してしまったり、なにか不都合があったりした場合は、新たに作り直すだろう。もし機械が壊れて飲み物を作れなくなってしまったら、お客にお金を払い戻すだろう。こうしたシナリオのそれぞれが、各々異なってはいるが一般的な例外処理の戦略を物語っている:

  • 損金処理(Write-off) ― 例外処理戦略の中で、一番簡単なものだ。つまり、なんにもしない。あるいは、すでにやっていたものを破棄してしまう。一見ひどい案のようにも思えるが、現実のビジネスではこの選択肢で許容できることもある。損失が少ない場合には、エラーから回復する方法を組み立てる方が、単に諦めるよりよっぽどコストが掛かることもある。たとえば、私はISPプロバイダ数社で仕事をしたことがあるが、そこでは請求/プロビジョニング(設備提供)のサイクルの中でエラーがあったときに、このアプローチを採用することがあった。その場合、顧客はまともにサービスを利用しながら、なんの請求も課されないで済む。失う利益が少なかったため、そうしたビジネスのやり方で問題がなかったのだ。一定の間隔で問題調整レポートを発行して、「無料の」アカウントを発見したらそれを無効にするだけでよかった。
  • やり直し(Retry) ― ある大きな処理のまとまり(「トランザクション」のような)の一部分だけが失敗したときは、基本的に2つの選択肢がある。成功した処理をすべて取り消すか、失敗した処理だけをやり直すか。もう一度やり直せば処理が成功する可能性が現実的に考えてあるのであれば、やり直しがふさわしい選択肢になる。たとえば、ビジネスルールに対する違反があった場合、やり直したとしても成功する可能性は薄い。しかし、外部システムに繋がらないといったような場合、やり直すことで成功する可能性が十分にある。やり直しの特殊なケースに Idempotent Receiver がある。この場合は、単純にすべての処理をやり直すだけでいい。なぜなら、処理が成功した場合に、受信側は重複メッセージを無視してくれるからだ。
  • 補償行為(Compensating Action) ― 最後の選択肢は、これまでに完了した処理をすべて取り消して、システムを正常な状態に戻す方法だ。このような「補償行為」は、たとえば金融システムで、いったん請求したお金を払い戻すような場合に有効だ。

これらの戦略はみな、2フェーズコミットとは違うものだ。2フェーズコミットは、準備/実行のステップを分割して行う。スターバックスの例で2フェーズコミットをやってみると、まず飲み物が出来上がるまで、レジの前でレシートとお金をテーブルに置いたまま待つことになる。それから、飲み物が出来上がってきて、同じくレジの前に置かれる。最後に、お金、レシート、飲み物が一瞬のうちに交換される。レジの店員もお客も、「トランザクション」が完了するまではその場を離れられない。こんな2フェーズコミットのアプローチを採用しようものなら、スターバックスのビジネスは間違いなく息の根を止められることになるだろう。というのも、一定時間内に給仕できる顧客数が劇的に減少してしまうからだ。次のことは、よく憶えておくべきだ。2フェーズコミットは物事を大いに単純化してくれるのだが、同時にメッセージの自由な流れ(と結果としてスケーラビリティ)を制限することにもなる。非同期に活動する複数の流れを遮って、状態をもったトランザクション資源を保持しなければならないからだ。

対話 (Conversations)

コーヒーショップでのやり取りは、Conversation パターンのシンプルだけれども一般性のある好例にもなっている。2つのパーティ(お客とコーヒーショップ)間の相互作用は、短い同期的な相互作用(注文と支払い)と長い非同期の相互作用(飲み物の作成と受け取り)から構成される。このタイプの対話は、何かを購入しようとするシナリオの中で、非常によく見られるのだ。たとえば、Amazonで本を注文するときは、短い同期的な相互作用の中で注文番号を割り当てて、残りのすべてのステップ(クレジットカードへの請求、商品の梱包、発送)は非同期的に行われる。残りのステップが完了した時点で、電子メールで通知(非同期)がなされる。なにか問題が起こったら、Amazonはたいていの場合、補償をする(クレジットカードへ返金する)かやり直す(紛失した商品を再送する)ことで対応する。

最後にまとめると、現実世界はけっこう非同期で動いていることが分かる。私たちの日常生活の多くの部分は、協調こそ必要だが非同期に行われる相互作用(電子メールを読んで返事を書いたり、コーヒーを買ったりなど)で成り立っている。つまり、こうした種類の相互作用をモデリングするには、非同期メッセージングのアーキテクチャが自然な手段になりうることを意味している。また、日常生活を見ていく中から、メッセージングによる上手な解決法を設計するヒントが見出せる、とも言えるのだ。ドモ アリガトウ ゴザイマス!


Comment by taday...@gmail.com, May 20, 2009

"write-off" の訳を「帳消し」→「損金処理」に変更しました。


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http://www.firefox-browser.de/wiki/Problemdiagnose

Problemdiagnose

aus FirefoxWiki, der freien Wissensdatenbank

Bild:info.png Hinweis: Für diesen Artikel wurden Informationen auf den offiziellen Hilfeseiten von Mozilla hinterlegt. Sie finden den Artikel unter dem Titel Allgemeine Fehlersuche (http://support.mozilla.com/de/kb/Basic+Troubleshooting).

In diesem Artikel finden Sie eine Schritt-für-Schritt-Anleitung, die Ihnen helfen kann, wenn Firefox nicht mehr ordnungsgemäß funktioniert.

Wichtig, bevor Sie mit dem Artikel fortfahren:

  1. Eine Neuinstallation von Firefox bringt meist keine Lösung Ihres Problems, da dabei nur die Programmdateien ersetzt werden und am Profil nichts verändert wird, in dem der Fehler meist zu finden ist.
  2. Stellen Sie sicher, dass Sie die neueste Firefox-Version (http://www.firefox-browser.de/wiki/Hauptseite) installiert haben und dass alle Ihre Erweiterungen und Themes auf dem neuesten Stand sind. Es kann durchaus sein, dass Ihr Problem eine bekannte Fehlfunktion ist, die mit einer neueren Version behoben wurde.
  3. Werfen Sie einen Blick auf die bekannten Probleme in der Firefox-FAQ und suchen Sie im Forum (http://www.firefox-browser.de/forum/search.php) nach Ihrem Problem. Falls Sie dort nicht fündig werden, fahren Sie hier fort.

Nun können Sie mit der Problemdiagnose beginnen.

Inhaltsverzeichnis

Lösungsvorschläge

Probieren Sie zuallererst, den Computer neu zu starten. Hilft dies nichts, folgen Sie den Anweisungen der Reihe nach. Sollte ein Lösungsvorschlag nicht helfen, probieren Sie den nächsten aus.

Wichtiger Hinweis:

  • Bevor Sie eine Datei löschen, machen Sie davon eine Sicherungskopie in ein anderes Verzeichnis.
  • Falls Firefox nach der Durchführung eines Schrittes wieder normal funktioniert, führen Sie bitte die nachfolgenden Schritte nicht mehr aus.

Schritt 1: Cache leeren

Wenn sich Firefox starten lässt und die Menüs noch ordnungsgemäß funktionieren, leeren Sie den Cache: "Extras > Einstellungen > Datenschutz > Cache > Cache löschen".
Ab Firefox 1.5 können Sie auch die Funktion "Private Daten löschen..." im Menü "Extras" benutzen. Ab Firefox 3.5 heißt der entsprechende Menüpunkt "Neueste Chronik löschen...".

Schritt 2: Firefox läuft noch im Hintergrund

Wichtig: Überspringen Sie diesen Schritt nicht!

Beenden Sie Firefox, sofern er noch läuft. Stellen Sie sicher, dass er auch nicht mehr im Hintergrund läuft. Schauen Sie dazu im Windows-Taskmanager nach dem evtl. noch vorhandenen Prozess "firefox.exe" oder unter Linux nach dem Prozess "firefox.bin" (Aufruf unter KDE mit Strg+Esc) und beenden Sie ihn.

Schritt 3: Erweiterungen und Themes u.a. als Problemursache - Safe Mode

Wenn Sie Erweiterungen oder Themes installiert haben oder Firefox sich nicht mehr normal starten läßt: Starten Sie Firefox im Safe Mode (nicht den Windows-Safe-Mode). Dies wird das Programm mit deaktivierten Erweiterungen und Themes starten. Wenn das Problem auch im Safe Mode besteht oder Firefox gar nicht im Safe Mode startet, fahren Sie mit Schritt 4 fort.

Wenn das Problem nicht mehr besteht, versuchen Sie folgendes:

  • Ab Firefox 1.5: Deaktivieren Sie die zuletzt installierten Erweiterungen mit einem Rechtsklick im Erweiterungsmanager. Sie können auch, wie im Artikel Safe Mode beschrieben, erst alle Erweiterungen deaktivieren und dann eine nach der anderen wieder aktivieren, um die schuldige Erweiterung zu finden.
  • Bis einschließlich Firefox 1.0.x: Deinstallieren Sie die zuletzt installierten Erweiterungen oder Themes. Befolgen Sie Schritt 2 ein weiteres mal und starten Firefox dann normal. Wenn das Problem trotzdem noch besteht,
  • wählen Sie das Standard-Theme aus ("Extras > Themes") und deinstallieren Sie alle ihre Erweiterungen unter "Extras > Erweiterungen" (auch wenn sie grau markiert sind, lassen sie sich trotzdem deinstallieren). Führen Sie Schritt 2 ein weiteres Mal aus und starten Sie Firefox normal.

Schritt 4: Das Problem besteht auch im Safe Mode - Neues Profil

Wichtig: Sichern Sie ihre persönlichen Daten, bevor Sie fortfahren, damit beispielsweise Lesezeichen und Passwörter nicht verloren gehen.

  • Führen Sie Schritt 2 aus und löschen sie die Datei "XUL.mfl" (Windows), "xul.mfasl" (Linux) oder "XUL FastLoad File" (Mac OS X). Ab Firefox 1.5 befindet sich diese Datei mit dem Cache im Temp-Ordner des Windows-Profils, z.B. unter "Lokale Einstellungen\Anwendungsdaten\Mozilla" in Windows XP. (Hinweis: Der Ordner ist standardmäßig versteckt.) und unter Linux im Ordner ".~/.mozilla/firefox". Bis Firefox 1.0.x finden Sie die Datei in Ihrem Profilordner. Diese Datei wird beim nächsten Start wieder angelegt. Wenn das Problem weiterhin besteht, fahren Sie fort.
  • Führen Sie Schritt 2 wieder aus, löschen Sie dann "downloads.rdf" und "localstore.rdf" aus ihrem Profilordner. Sie verlieren dabei Ihre Download-History sowie alle Änderungen, die Sie an ihren Toolbars vorgenommen haben. Wenn dies nichts hilft, fahren Sie fort.
  • Führen Sie Schritt 2 aus, löschen Sie dann die Ordner "chrome" und "extensions" aus ihrem Profilordner. Sie verlieren dabei alle ihre Erweiterungen und Themes. Wenn auch dies nichts hilft, fahren Sie fort.
  • Führen Sie Schritt 2 aus und legen Sie ein neues Profil an. Wenn das Problem damit gelöst ist, kopieren Sie stückweise Ihre wichtigen persönlichen Daten in das neue Profil. Eine erweiterte Anleitung und eine Liste, welche Dateien Sie kopieren können, finden Sie unter: Neues Profil.

Schritt 5: Plugins als Problemursache

Darüber hinaus können auch veraltete oder beschädigte Plugins als Fehlerursache in Betracht kommen. Plugins sind Zusatzmodule von Drittherstellern wie Adobe, Apple oder Sun mit denen bestimmte Formate wie beispielsweise Flash, Quicktime oder Java-Applets ausgeführt werden können.

Wichtig: Plugins werden im Safe Mode nicht deaktiviert und auch durch kein neues Profil gelöscht. Daher sollten die vorhandenen Plugins unbedingt aktualisiert oder testweise deinstalliert werden. Die Downloadadressen mit den aktuellen Versionen sowie weiterführende Informationen befinden sich im Abschnitt Plugins.

Schritt 6: Neuinstallation

  1. Deinstallieren Sie Firefox
  2. Löschen (oder verschieben) Sie das Firefox Installations-Verzeichnis (Windows-Standard: C:\Programme\Mozilla Firefox)
  3. Öffnen Sie das Temp-Verzeichnis Ihres Betriebssystems und löschen Sie alle Dateien darin. Unter Windows 98/ME: Start > Ausführen > Geben Sie C:\Temp ein, klicken Sie OK und löschen Sie alle dort vorhandenen Dateien. Löschen Sie mit der gleichen Methode alle Dateien in C:\Windows\Temp. Unter Windows 2000/XP: Start > Ausführen > Geben sie %temp% ein, klicken sie OK und löschen Sie alle Dateien darin.
  4. Starten Sie Ihren Computer neu.
  5. Laden Sie Firefox von mozilla.com (http://www.mozilla.com/) erneut herunter und installieren Sie ihn. Wenn das Problem weiterhin besteht, probieren Sie den nächsten Lösungsvorschlag aus.

Schritt 7: firefox.exe umbenennen

Führen Sie Schritt 2 aus, nennen Sie die Datei "firefox.exe" im Programmordner auf "firefox1.exe" um und starten Sie Firefox, indem Sie auf "firefox1.exe" doppelklicken.

Beachten Sie, dass Ihre Firewall Firefox nach dem Umbenennen komplett neu erkennen muss.

Hinweis: Unter Linux und MacOSX können Sie auf diesen Schritt verzichten, da dort Probleme mit Personal Firewalls oder Adware so gut wie nie auftreten. Wenn sie diesen Schritt trotzdem ausführen wollen, nennen Sie die Programmdatei entsprechend um.

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Es kann vorkommen, dass Programme wie z.B. Anitvirenprogramme, Firewalls, Spamblocker die Funktion von Firefox beeinträchtigen. Stellen Sie zudem sicher, dass Firefox in Ihrer Firewall freigegeben ist. Zur Fehlereingrenzung deaktivieren Sie die Schutzprogramme und schauen, ob es dann funktioniert. In einigen Fällen ist es sogar ratsam, die o.g. Programme testweise komplett zu deinstallieren, da trotz Deaktivierung im Hintergrund weiter Prozesse dieser Programme aktiv sind, die die Funktion von Firefox beeinträchtigen können.

Schadsoftware
Außerdem sollten Sie ihr System auf Viren, Trojaner, Spyware, Adware und andere unerwünschte Software prüfen. Hierzu könne spezielle Anti-Spywareprogramme eingesetzt werden. Viele Hersteller von Antivirusprogrammen stelle eine kostenlose Testversion zur Verfügung, mit der der Rechner auf Schadsoftware überprüft werden kann.

Falls Sie Probleme mit der Anzeige von Webseiten haben, helfen vielleicht folgende Artikel:

Siehe auch

http://thesolutionfirm.com/cyber-security-training.html
 

Cyber Security Training and Cyber Security Certification

 

Cyber security issues continue to top headlines. Incidents such as cyber attacks from China, Russia, Israel, and talk of cyber warfare makes the news on an almost daily basis. This cyber security training course provides information security professionals in the cyber technology field, or those interested in this field, a broader understanding of the challenges and skills needed to secure Internet-based and networked computer systems.

Cyber attacks can result in critical business losses. Cyber criminals and cyber hackers often target firewalls, Intrusion Detection Systems (IDSs), and access controls to penetrate the network and cause serious damage to network infrastructure and electronic assets (e.g., data and email).

 

Cyber Security Training

 

Cyber Security Training Course - Hands-on Labs

Some of the hands-on labs available in this cyber security training course include:

* Cyber Footprinting                             * Exploiting Low Hanging Fruit
* Building an Access Control List (ACL)
* Bypassing Firewalls and Tunneling
* Attacking Availability
* Attacking Authentication
* IDS Design and Deployment
* Risk Assessment Basics
* Security Policy Analysis
* Network Computer System Lockdown and Security Best Practices
*Cryptographic Attacks
*Vulnerability Assessment Tools
 

To get a complete outline or learn more about our interactive cyber security training course, please call our Training Director at 713-482-8323.

 

Demand for Cyber Certified Employees

The demand for security certified professionals is on the rise. This course combines in-depth lectures, open discussions, demonstrations, group exercises, and intensive hands-on labs. 

 

Bring This Cyber Security Training Course to Your Location

With a group of eight or more, we can bring Cyber Security: Defending Critical Infrastructure from Cyber Attack to your location. If you're looking to prepare your employees for certification and are interested in bringing the best cyber security education to your organization, let us help you save time out of the office and tuition dollars! Our team of cyber security experts will work diligently to deliver this cyber security class at your location making sure it meets your specific organizational needs.

 

Get Cyber Security Certified

The purpose of our cyber security training course is to address vital aspects of IT security.  Our cyber security training course covers the protection and control of information, availability of data confidentiality, and how to handle problems such as unauthorized data modification, disruption, destruction, and misuse of information. Students considering this class should have previously attended a Network+ or Security+ course and have basic computer skills. This course is a good primer for those considering ethical hacking, penetration testing, or even a CISSP boot camp.

 

How to Buy

Superior Solutions, Inc. accepts payment by Visa, MasterCard, American Express, and by approved check. Please contact our sales department for pricing and availability. We are registered with the Central Contractor Registry (CCR) and Dun and Bradstreet (D&B).

 

Get More Information

For complete outlines, specific dates, locations, and pricing information, please call our Training Director at 713-482-8323 or email TheSolutionFirm 

 

Cyber Security Training: Defending Critical Infrastructure from Cyber Attack

Cyber Security: Defending Critical Infrastructure from Cyber Attack provides students with the hands-on skills to secure and protect the confidentiality, availability, and integrity of networked systems. This cyber security training course also reviews cyber terminology, emerging rules, and regulatory compliance requirements that cyber business professionals need to know. At a high level, this course discusses job roles and emerging needs for those wanting to move into the cyber security market.  

 

CISSP Exam Cram 2 - Michael Gregg

 

Do You Have What It Takes To Become A Cyber Security Expert?

Our training course will provide you with a broad base of skills that you can immediately begin to use and help you along the path of becoming a cyber security expert. This course is a good starting point for those seeking certification. Our cyber security training course includes:

* Cyber Crime Trends
* Cyber Attack Patterns
* Attack Methodologies
* Basic Network System Security Practices and Hardening Techniques
* Router and ACL Configuration
* Firewall Attack Methods
* Cyber Directives and Compliance Requirements Mandated by the U.S. Government
* Cyber Roles Required to Successfully Architect Secure Systems
* The Cyber Attack Cycle and Cyber War Techniques
* Risk Management Techniques
* Policy Development
* Authentication Best Practices
* Techniques to Build Layered Defenses
* Vulnerability Scanning and Network Assessment
*Implementing Cryptographic Solutions for Securing Communications at Rest and in Transit
 

Cyber Security: Defending Critical Infrastructure Outline

Every cyber security certification training course is taught by expert instructors who are ethical hackers, industry-recognized IT security professionals, and highly skilled cyber security experts. Our certification and training courses are delivered in classrooms and directly at customer locations nationwide.

Module 1: Cyber Security Basics
Topics include: Goals of cyber security, structure of the Internet, common attacks, and a review of the players in the cyber arena

Module 2: Understanding Cyber Technology
Topics include: Cyber technology, TCP/IP, networked applications, and network components

Module 3: Cyber Attack Technology
Topics include: Threats, exposures, weaknesses, and attack methodologies

Module 4: Access Control
Topics include: The role of access controls, group policies, security templates, and firewall policies

Module 5: Network Architecture Integration
Topics include: The creation of secure architectures, the creation of security zones, and accreditation requirements such as DIACAP and NIACAP

Module 6: Authentication
Topics include: Authentication, authorization, and accounting, enterprise grade authentication, and the role of multifactor authentication

Module 7: Intrusion Detection and Incident Response
Topics include: Intrusion prevention and detection, incident response, forensic analysis, and the evidence life cycle

Module 8: Risk Management
Topics include: Identifying assets, determining exposures, considering controls to reduce cyber risk, and mechanisms to secure critical systems

Module 9: Security Policies and Best Practices
Topics include: Designing and implementing policies, standards, and procedures developing best practices

Module 10: Host Security
Topics include: Analyzing systems, identifying unneeded services, patching known vulnerabilities, and hardening systems

Module 11: Applied Cryptography
Topics include: The basic elements of cryptosystems and how cryptosystems can be used to enhance cyber security

Module 12: Securing Network Communications
Topics include: Securing remote access, locking down WiFI, creating VPNs, and assessing the need for secure communications

Module 13: Vulnerability Assessment and Audit
Topics include: Scanning systems, performing vulnerability assessments, executing penetration tests and mechanisms to review log files, and working with syslog servers

Module 14: Cyber Security Futures
Topics include: An analysis of the future of cyber security, emerging job roles, and needed skills for the emerging cyber security field

 

The Superior Solutions logo is a trademark of Superior Solutions, Inc. All other brand names and trademarks are TM and/or copyright by their respective owners. CISSP is a registered trademark of ISC2.

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Top 87 Fonts A Designer Should Download

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Fonts are very useful for a designer. Only if you would take into consideration the typography mania and you have a great argument for the intelligent use of fonts. The web safe fonts seem boring at a certain moment. With sIFR and other web technologies you can insert any font you want in a website and you can give the site a more interesting style. So, let’s say you ain’t a web designer, you are more a graphic designer, you make logos and other interesting things. You gotta have a serious collection of logos, unless you are a pretty exquisite designer and you’re making a custom font for every project you are working on. Thus being said, check the fonts, download them cause most of them are free, look for a readme from the author to see where you can use them and maybe buy some of these on the list which are premium fonts.

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Tuesday, July 27, 2010

Clojure: Destructuring

In The Joy of Clojure (TJoC) destructuring is described as a mini-language within Clojure. It's not essential to learn this mini-language; however, as the authors of TJoC point out, destructuring facilitates concise, elegant code.

What is destructuring?
Clojure supports abstract structural binding, often called destructuring, in let binding lists, fn parameter lists, and any macro that expands into a let or fn. -- http://clojure.org/special_forms
The simplest example of destructuring is assigning the values of a vector.
user=> (def point [5 7])
#'user/point

user=> (let [[x y] point]
(println "x:" x "y:" y))
x: 5 y: 7
note: I'm using let for my examples of destructuring; however, in practice I tend to use destructuring in function parameter lists at least as often, if not more often.

I'll admit that I can't remember ever using destructuring like the first example, but it's a good starting point. A more realistic example is splitting a vector into a head and a tail. When defining a function with an arglist** you use an ampersand. The same is true in destructuring.
user=> (def indexes [1 2 3])
#'user/indexes

user=> (let [[x & more] indexes]
(println "x:" x "more:" more))
x: 1 more: (2 3)
It's also worth noting that you can bind the entire vector to a local using the :as directive.
user=> (def indexes [1 2 3])
#'user/indexes

user=> (let [[x & more :as full-list] indexes]
(println "x:" x "more:" more "full list:" full-list))
x: 1 more: (2 3) full list: [1 2 3]
Vector examples are the easiest; however, in practice I find myself using destructuring with maps far more often.

Simple destructuring on a map is as easy as choosing a local name and providing the key.
user=> (def point {:x 5 :y 7})
#'user/point

user=> (let [{the-x :x the-y :y} point]
(println "x:" the-x "y:" the-y))
x: 5 y: 7
As the example shows, the values of :x and :y are bound to locals with the names the-x and the-y. In practice we would never prepend "the-" to our local names; however, using different names provides a bit of clarity for our first example. In production code you would be much more likely to want locals with the same name as the key. This works perfectly well, as the next example shows.
user=> (def point {:x 5 :y 7})
#'user/point

user=> (let [{x :x y :y} point]
(println "x:" x "y:" y))
x: 5 y: 7
While this works perfectly well, creating locals with the same name as the keys becomes tedious and annoying (especially when your keys are longer than one letter). Clojure anticipates this frustration and provides :keys directive that allows you to specify keys that you would like as locals with the same name.
user=> (def point {:x 5 :y 7})
#'user/point

user=> (let [{:keys [x y]} point]
(println "x:" x "y:" y))
x: 5 y: 7
There are a few directives that work while destructuring maps. The above example shows the use of :keys. In practice I end up using :keys the most; however, I've also used the :as directive while working with maps.

The following example illustrates the use of an :as directive to bind a local with the entire map.
user=> (def point {:x 5 :y 7})
#'user/point

user=> (let [{:keys [x y] :as the-point} point]
(println "x:" x "y:" y "point:" the-point))
x: 5 y: 7 point: {:x 5, :y 7}
We've now seen the :as directive used for both vectors and maps. In both cases the local is always assigned to the entire expression that is being destructured.

For completeness I'll document the :or directive; however, I must admit that I've never used it in practice. The :or directive is used to assign default values when the map being destructured doesn't contain a specified key.
user=> (def point {:y 7})
#'user/point

user=> (let [{:keys [x y] :or {x 0 y 0}} point]
(println "x:" x "y:" y))
x: 0 y: 7
Lastly, it's also worth noting that you can destructure nested maps, vectors and a combination of both.

The following example destructures a nested map
user=> (def book {:name "SICP" :details {:pages 657 :isbn-10 "0262011530"}})
#'user/book

user=> (let [{name :name {pages :pages isbn-10 :isbn-10} :details} book]
(println "name:" name "pages:" pages "isbn-10:" isbn-10))
name: SICP pages: 657 isbn-10: 0262011530
As you would expect, you can also use directives while destructuring nested maps.
user=> (def book {:name "SICP" :details {:pages 657 :isbn-10 "0262011530"}})
#'user/book
user=>
user=> (let [{name :name {:keys [pages isbn-10]} :details} book]
(println "name:" name "pages:" pages "isbn-10:" isbn-10))
name: SICP pages: 657 isbn-10: 0262011530
Destructuring nested vectors is also very straight-forward, as the following example illustrates
user=> (def numbers [[1 2][3 4]])
#'user/numbers

user=> (let [[[a b][c d]] numbers]
(println "a:" a "b:" b "c:" c "d:" d))
a: 1 b: 2 c: 3 d: 4
Since binding forms can be nested within one another arbitrarily, you can pull apart just about anything -- http://clojure.org/special_forms
The following example destructures a map and a vector at the same time.
user=> (def golfer {:name "Jim" :scores [3 5 4 5]})
#'user/golfer

user=> (let [{name :name [hole1 hole2] :scores} golfer]
(println "name:" name "hole1:" hole1 "hole2:" hole2))
name: Jim hole1: 3 hole2: 5
The same example can be rewritten using a function definition to show the simplicity of using destructuring in parameter lists.
user=> (defn print-status [{name :name [hole1 hole2] :scores}] 
(println "name:" name "hole1:" hole1 "hole2:" hole2))
#'user/print-status

user=> (print-status {:name "Jim" :scores [3 5 4 5]})
name: Jim hole1: 3 hole2: 5
There are other (less used) directives and deeper explanations available on http://clojure.org/special_forms and in The Joy of Clojure. I recommend both.

**(defn do-something [x y & more] ... )

Labels: ,




Comments:
Nice post. One other note that naturally follows from the end of your post is that destructuring forms the basis of Clojure's named arguments:

(defn print-status [& {name :name [hole1 hole2] :scores}]
(println "name:" name "hole1:" hole1 "hole2:" hole2))

(print-status :name "Joey" :scores [42 18])


You can also use pre-conditions to check if certain arguments are passed in:


(defn print-status [& {name :name [hole1 hole2] :scores}]
{:pre [name]}
(println "name:" name "hole1:" hole1 "hole2:" hole2))

(print-status :scores [42 18])
; java.lang.AssertionError: Assert failed: name

(print-status :name "Joey" :scores [42 18])
; name: Joey hole1: 42 hole2: 18


:f
 
Good stuff Fogus, thanks.

Cheers, Jay
 
Can you combine :as and :or et al?
 
Yes, all the directives can be used at the same time.

Cheers, Jay
 
Hi, one note about using destructuring for function arguments : by doing so, you're quite explicitly establishing a more detailed contract with the consumer of the function. That is, you open the internals of the passed arguments.

Depending on the fact that the user may or may not be aware of the internals of the arguments, it may or may not be a good idea.

So I tend to think about the use of destructuring function arguments directly in the function signature, depending on whether the "layout" of the arguments of the function is part of the user API.
 
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http://code.google.com/p/zxing/wiki/ScanningViaIntent
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Updated May 21, 2010 by sro...@gmail.com
Labels: Featured
  ScanningViaIntent  
Simple access to barcode scanning in Android, via Intents rather than direct use of project code

How to scan a barcode from another Android application via Intents

Manually

If the Barcode Scanner is installed on your Android device, you can have it scan for you and return the result, just by sending it an Intent. For example, you can hook up a button to scan a QR code like this:

public Button.OnClickListener mScan = new Button.OnClickListener() {
    public void onClick(View v) {
        Intent intent = new Intent("com.google.zxing.client.android.SCAN");
        intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
        startActivityForResult(intent, 0);
    }
};

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {
        if (resultCode == RESULT_OK) {
            String contents = intent.getStringExtra("SCAN_RESULT");
            String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
            // Handle successful scan
        } else if (resultCode == RESULT_CANCELED) {
            // Handle cancel
        }
    }
}

For more options, like scanning a product barcode, or asking Barcode Scanner to encode and display a barcode for you, see this source file:

http://code.google.com/p/zxing/source/browse/trunk/android/src/com/google/zxing/client/android/Intents.java

And here's some source from our test app which shows how to use them:

http://code.google.com/p/zxing/source/browse/trunk/androidtest/src/com/google/zxing/client/androidtest/ZXingTestActivity.java

IntentIntegrator

We have also begun creating a small library of classes that encapsulate some of the details above. See IntentIntegrator for a possibly easier way to integrate. In particular this will handle the case where Barcode Scanner is not yet installed.

http://code.google.com/p/zxing/source/browse/trunk/android-integration/src/com/google/zxing/integration/android/IntentIntegrator.java

Via URL

As of Barcode Scanner v2.6, you can also launch the app from a URL in the Browser. Simple create a hyperlink to http://zxing.appspot.com/scan and Barcode Scanner will offer to launch to handle it. Users can also choose to always have Barcode Scanner open automatically.

NOTE: This URL is not meant to serve an actual web page in a browser, it's just a hook to launch a native app.

Known Issues

User jamesikanos reports the following 'gotcha':

  1. Create a TabHost activity with launchMode "singleInstance"
  2. Create a child activity with a "Start scan" button (launch zxing using the IntentIntegrator from this button)
  3. onActivityResult in your child activity will return immediately as "cancelled"
  4. onActivityResult is never called subsequently
http://techcrunch.com/2010/07/29/google-location-mobile-display-ads/
Get Extra Early Bird Tkts to September's Disrupt SF by midnight July 31 »
Google Introduces Location-Aware Mobile Display Ads
by Erick Schonfeld on Jul 29, 2010

Google’s mobile ads are becoming more location-aware. Today, Google is introducing mobile display ads for both the iPhone and Android phones which can be geo-targeted. Advertisers will be able to check a “location extension for display” box and their ads will become geo-enabled when viewed in mobile browsers or apps.  A little double-arrow will open up the ad and show the business pinned on map with two big blue buttons to get directions or call the business.  Google will only charge for calls or clicks.

Google already offers so-called “location extension” ads for mobile search, but this is the first time it is expanding the concept to mobile display ads.  Google says that mobile ads that offer a location generally see an average 8 percent increase in click-through rates over plain-vanilla mobile ads, and click-to-call mobile ads see a 6 percent increase in clicks.

Mobile ads such as these could open up new marketing opportunities.  Seeing a business on a map makes it less abstract. It literally grounds the ad for the consumer.  And the click-to-call option is key.  Local merchants love getting calls from customers.  In addition to targeting by location, of course, Google also targets mobile display ads contextually and by device.

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