mcdonaldland

Design Patterns Quick Reference

28 11 2007

So every time I am designing something new I find myself either searching Google or opening up a gang of four (GoF) book to aid me. I searched for a bit trying to find a handy-dandy flash card showing class diagrams and purposes for the basic GoF patterns but was unable to locate a good one (for free). So I made my own.If you see any mistakes or improvements please post here and I will update the docs.

There are multiple formats you can download in:

PDF Cards: Get it!

Poster: Get it!

Page 1:

Design Patterns Quick Reference (Page 1)

Page 2:

Design Patterns Quick Reference (Page 2)

Enjoy!

Actions

Informations

Date : 28 November 2007
Categories : Software

177 responses to “Design Patterns Quick Reference”

22 01 2008: Mark Gregory Turansky » Blog Archive » Design Patterns Quick Reference Cards (14:02:12) :

[...] Click here to view the high-resolution printable images. [...]
22 01 2008: Andrew (22:32:19) :

Great, great job. This same project was on my list of things to do. But now you’ve done it for me! Yes, I would love to have the Visio file. Thanks so much.
22 01 2008: Jason McDonald (22:37:03) :

Thanks. You can download the visio file ***DELETED – GET THE PDF ABOVE***.
23 01 2008: Renaud (03:25:05) :

Thanks!
23 01 2008: Spacebat (06:26:25) :

JPEG is not a good format for crisp diagrams such as this. PNG or GIF would do a better job.

Good content though, thanks!
23 01 2008: Jason McDonald (08:51:43) :

Spacebat – thanks. I originally posted this before I moved to my own server so I was limited in what I was allowed to upload but I have included the Visio file in a comment above. The jpg is crisp but at the cost of size – each is close to 2MB…

I will see about replacing with a PNG (I have one already…)

*** Update ***

So I looked at the PNG and it is even larger than the JPG but the same image size and resolution so I am just going to stick with the JPG. If you guys have any problems printing (fuzziness or anything) let me know and I will see what I can do.
23 01 2008: JMD (10:25:06) :

I agree with Spacebat — Presenting vector diagrams like this in a lossy image format like JPEG is not the best practice, file size issues or otherwise. Even better than PNG or GIF would be PDF.
23 01 2008: someguy (10:26:05) :

convert to 16 or 32 color palette, run png through pngout…. presto
23 01 2008: JMD (10:29:03) :

Follow-up: If you are looking for an easy way to get PDF output, here is a free open-source tool that is available for Windows:

http://sourceforge.net/projects/pdfcreator/
23 01 2008: Jason McDonald (10:37:54) :

Thanks for all the feedback. I added two links to the original post, 1 for a PDF version and 1 for a Visio version.
23 01 2008: JMD (10:46:24) :

Many thanks for the PDF (Mac/Linux user)!
23 01 2008: Jason McDonald (10:50:13) :

Np

Sometimes forget how many people are using non-windows env’s…
23 01 2008: Weng Rodrigo (12:06:15) :

Great Stuff! Thanks for sharing!
23 01 2008: Ross Martin (14:07:26) :

Thanks!
24 01 2008: Diego Carrion (09:28:17) :

Very nice!
26 01 2008: Marc (05:44:41) :

Via hotlink de del.icio.us, descobreixo la pàgina de McDonaldLand (en anglès).
26 01 2008: DavidTan (06:34:10) :

Thanks a lot! Loving It!
28 01 2008: YoungSu (02:33:54) :

Thanks. your passion about gof DP.
I want to share this resource with korea programmer.
(sure, i share your blog. thanks! your passion!!)
29 01 2008: Martin (20:43:48) :

very great job have you done… the visio link is broken but the PDF all we need
29 01 2008: Jason McDonald (20:45:14) :

Thanks – sorry about the broken link. I just removed it.
30 01 2008: Jose Noheda (05:13:45) :

Thank you. Very useful
30 01 2008: Milo Felipe (06:17:04) :

Thanks!
30 01 2008: Design Patterns Quick Reference | foojam.com (07:30:02) :

[...] McDonald posted some quick reference diagrams for the Gang of Four design patterns on his site today. Each section has the name of the pattern, a [...]
30 01 2008: Gavin (07:50:02) :

Thanks a lot for sharing. Good job.
30 01 2008: pallav (07:58:26) :

This is good thinking man!! This will help the whole lot of java developers. I will hyperlink this page from our company blog site.
30 01 2008: Dab Snooper (09:04:58) :

Thanks a lot!

I’ll point my colleagues to this page!
30 01 2008: GoF Patterns quick reference « Javatron’s Weblog (10:06:17) :

[...] Design Patterns Quick Reference [...]
30 01 2008: RK (10:32:26) :

Very nice!
30 01 2008: “Design Patterns”-Cheat Sheet » Zustandsforschung (10:57:05) :

[...] ein Eintrag in der Kategorie “Cheat Sheets”: Die “Design Patterns Quick Reference”, wo auf 2 Seiten in 23 kleinen Diagrammen, die gebräuchlichsten Entwurfsmuster aufgeführt [...]
30 01 2008: dan (12:19:41) :

Very nice! Thanks. There are a few typos in the document of the word “Concreate”
30 01 2008: JW (12:31:32) :

Many thanks, it’s now on my noticeboard and I’ve passed the link on.
30 01 2008: K. Adam Christensen (12:56:26) :

Awesome work. Thanks!
30 01 2008: Mellow Morning » Design Patterns (13:31:49) :

[...] Just a link this time, great reference on design patterns: http://www.mcdonaldland.info/2007/11/28/40/ [...]
30 01 2008: Jason McDonald (13:49:38) :

Thanks Dan – I uploaded a corrected version. Concreate -> Conrete
30 01 2008: Cliff Hall (16:21:01) :

Beautiful work, Jason. Thank you.
30 01 2008: Fernando (16:23:27) :

Hi, is there a chance we can get this translated into Spanish? I would be willing to do it.
E-mail me if you are interested!

Regards
Fernando
30 01 2008: Jason McDonald (16:28:16) :

Sure and great idea. I emailed you info about translating it.

On that note, if there are other languages people want to volunteer to translate into, just post here and I’ll get in touch with you.
30 01 2008: Steve (18:14:40) :

Hi, great job with the patterns!! I have been looking for something like this for a while now, too.

I do have a question about the Command pattern, though. I think it has a slight error. It seems like the reference you have from Receiver to Command is not correct. The reference should be from ConcreteCommand to Receiver (in other words, the Receiver does not know about the Command, the Command knows about the Receiver).

Regards,
Steve
30 01 2008: Jason McDonald (18:51:09) :

Thanks for the heads up. I uploaded a fixed version.

Let me know if you guys see any more problems.
30 01 2008: a (20:37:09) :

The reason you’re getting so much bandwidth on the jpg is because you link to the huge image *within your post* instead of using a shrunk-down version. Every single person that visits gets the huge file – just rightclick ‘view image’.
30 01 2008: Jason McDonald (20:41:19) :

The images on the post are actually still hosted at wordpress.com – never moved them over when I moved my blog here. The bandwidth is not a problem – I have more than I could possibly use of that. The problem is CPU, which the support guys are looking into now. It appears that even when no activity is going on from my site there is still a significant CPU load. So until they can diagnose the problem I removed some of the “heavier” items to keep the disk access to a minimum.
30 01 2008: David (23:13:09) :

I think there’s an error in the Composite pattern. I’m pretty sure the concrete class (not the interface) you’ve called Component should be called Composite.

Still a very handy item. As soon as I saw it, I knew I wanted a printed copy on hand.
30 01 2008: Design Patterns Quick Reference (23:15:17) :

[...] McDonald has put together a cheatsheet of some Gang of Four design [...]
30 01 2008: Jason McDonald (23:20:03) :

Right you are David – a fixed version is now uploaded. Thanks!
30 01 2008: Mahesh (23:28:42) :

Jason,

Great job!!

Is it possible for you to reinstate the link for the visio version? I would like to modify the version to highlight those patterns that are being extensively used in my project.

Regards,
Mahesh
30 01 2008: Jason McDonald (23:34:48) :

Mahesh – if I can get my cpu/bandwidth issues sorted out I will gladly make the file available again. I will hopefully hear something back tomorrow.
31 01 2008: Ali Ozan CIL (04:27:16) :

Great work!!
Thanks!
31 01 2008: Igor (07:28:21) :

Great job! Thanks.

I can translate this picture into Russian. You can contact me via e-mail.

Thank you.
31 01 2008: Quick Reference a los patrones de Diseño. « Weblog de Milagros Luchini (10:18:17) :

[...] Link: Post [...]
31 01 2008: Joel (10:48:21) :

You should consider slapping these on Zazzle so they can be printed as posters. You’ll make a few bucks and people will get a nice piece of art for their office wall.
31 01 2008: asif (11:19:09) :

Nice work!!!!
A link ( client and interface ) is missing in the Proxy pattern.

asif
31 01 2008: » Referencia rápida de patrones de diseño (11:44:11) :

[...] Vía TheServerSide, me encuentro con una referencia rápida de patrones de diseño de software que ha hecho Jason McDonald. [...]
31 01 2008: Jason McDonald (11:54:57) :

Joel – I will be releasing an announcement soon on the availability of something like this. I have everything set up and ready to go and am just giving it a bit to iron out all the errors.
31 01 2008: Design Patterns Cheat Sheet at building blocks (13:32:32) :

[...] Jason McDonald has created a very well put together design patterns cheat sheet. I thought it would make a nice poster, so I made myself a print resolution version and ordered it through Zazzle. I’m looking forward to hanging it on the wall! [...]
31 01 2008: Design Patterns Quick Reference | Manfred Weber`s Weblog (14:50:01) :

[...] might want to stick it to the [...]
31 01 2008: links for 2008-02-01 « Mike Does Tech (19:28:49) :

[...] mcdonaldland » Design Patterns Quick Reference (tags: patterns cheatsheet) [...]
31 01 2008: Jason McDonald (23:03:36) :

I just finished the poster version and uploaded it to CafePress – you can just pay for the poster printing/paper/labor/etc. and they will send you a production ready copy.

Go here to get the poster:
http://www.cafepress.com/codergear

We will have more stuff available soon – porting the graphics to the right size as we speak. Stay tuned to http://www.cafepress.com/codergear or my blog (mcdonaldland.info) for more info.
1 02 2008: Weekly linkdump #111 - cb - ???? ????????????? (03:24:12) :

[...] ??????????? ?????? ???????? ?????????????? “????? ???????”, ? ???? PDF, Design Patterns Quick Reference [...]
1 02 2008: prashant (06:31:15) :

Hi,

Cool post and enjoyed downloading the pdf.

Thanks
Prashant Jalasutram
http://prashantjalasutram.blogspot.com/
1 02 2008: Fernando Costa » Blog Archive » Referência para Design Patterns (07:55:34) :

[...] foi divulgado este cartão de referência dos Design Patterns da Gang dos [...]
1 02 2008: ???? ???????? IKEEN Group » Blog Archive » GoF Patterns Card (23:38:26) :

[...] ????????. ???????? ? ??????? ???????? ??????? ????? ? ??? ?????. ???????? ????????????? ????????? ????? ? ??????? ??? [...]
2 02 2008: Yohan Liyanage (00:08:22) :

Thanks a lot for creating this. This is really useful to me and others who are out there having a tough time rolling over books to find the pattern details.
3 02 2008: Gaurav (21:44:37) :

Hi,

Thanks for the valuable resource.

Regards
Gaurav
4 02 2008: Manoj Prasad Gupta (02:08:35) :

Hi McDonald,
Great work. My request is to make it as a complete reference guide.
You can add code snippet (Java, C++ etc) for each and every pattern to make it complete.

Regds
-Manoj
4 02 2008: Jeff Mutonho (04:08:55) :

Hi McDonald

Great stuff! Any chance of reposting the Vision link?

Thanks

Jeff Mutonho
4 02 2008: Jeff Mutonho (05:16:19) :

I meant Visio in my last post
4 02 2008: Jason McDonald (08:27:57) :

Manoj Prasad Gupta – I am currently working on a project through DZone to produce one of these for their RefCardz products. This version will be free and will have some code samples (at least that is the plan at this point).

Jeff Mutonho – I may repost the visio link – I need to wait and see what is going on with the above mentioned RefCardz program first.

Thanks for all the interest!!
5 02 2008: Finds of the Week - February 3, 2007 » Chinh Do (00:08:50) :

[...] If you are into design patterns, Jason McDonald put together a very nice quick reference poster/PDF on the most common patterns. [...]
7 02 2008: Jagan Rao (10:24:05) :

Very useful content. thanks for sharing the good work. Its much appretiated.
8 02 2008: Pratik (02:40:54) :

Thank you – great work!
8 02 2008: Niksa Jakovljevic (04:12:01) :

Great reference. Something I was looking for long time ago in my student days
I think it would be nice to put known uses for each pattern

Thanks

Niksa Jakovljevic
9 02 2008: Static on WAQ177 » mcdonaldland » Design Patterns Quick Reference (13:36:55) :

[...] Nice. Jason put together a cheet sheet for design patterns. Reminds me of the flex and as3 posters given out during MAX 2006. Which were very useful! You just need enough wall space in your office. [From mcdonaldland » Design Patterns Quick Reference] [...]
11 02 2008: YoungSu (01:51:38) :

Hi McDonald!
My name is Son YoungSu!
Do you remebmer me?

i am a korean programmer.

i want to translate your pattern rcard in korean version.

do you give me visio file?
if you have interesting this job, give me email please!

once again thank you! your efforts!
11 02 2008: pcollaog’s blog » Torpedo de Patrones de Diseño (13:22:42) :

[...] Les dejo una interesante recolección de patrones de diseño que vi en “The server side” y luego en la página del autor, el Sr. Jason McDonald. [...]
18 02 2008: Abhijeet Maharana (23:13:57) :

The comments say it all. And I will say it again … great!!!
I just pinned it over my desk
29 02 2008: The Geekette Speaketh (10:01:19) :

Design patterns in a snap…

Whether it’s brainstorming a building or creating software, design patterns have always been a part of an architect’s arsenal of tools.  No self-respecting software architect would be unaware of the famous patterns compiled by the Gang of Fo…
13 03 2008: Alan Brown (15:19:41) :

Excellent. Thanks!
18 03 2008: Anderscht? (18:02:41) :

Design Patterns Referenz…

Wer jemals etwas von Design Patterns gehöhrt hat, kennt das GoF Buch. Viel besser finde ich das Head First Design Patterns Buch welches gerade von mir gelesen wird. Eine schöne Übersicht zum Ausdrucken und an die Wand hängen gibt es…
2 04 2008: Sai (12:44:27) :

Just the right presentation I was looking for. Thanks a ton Jason!
4 04 2008: Interesting Finds: March 26, 2008 « Hank Wallace (18:21:34) :

[...] Your Programming ProductivityJakob Neilsen – Top 10 Application Design MistakesJason McDonald – GoF Design Patterns Quick Reference Technorati tags: Programming, GoF, [...]
7 04 2008: Some articles and links « Mantrid’s Weblog (06:43:42) :

[...] Design Patterns Cheatsheet [...]
1 05 2008: Derick (03:16:10) :

Cool, well done, thanks for sharing!
14 05 2008: Arun (11:30:11) :

Thanks.. This is very useful
22 05 2008: Heart’s CodeList » Design Pattern Quick Reference (09:25:33) :

[...] Design Pattern Quick Reference Tag: Tip.Tech — Heart @ 1:23 ?? @ Design Pattern Quick Reference [...]
29 05 2008: user (13:57:07) :

thanks a lot, great work
7 06 2008: Design Patterns Quick Reference « PHP::Impact ( [str blog] ) (11:29:39) :

[...] 7, 2008 Jason McDonald posted some quick reference diagrams for the Gang of Four design patterns on his site today. Each section has the name of the pattern, a [...]
7 06 2008: Padrões de projeto « Teste (13:28:57) :

[...] Padrões de projeto ótimo resumo: http://www.mcdonaldland.info/2007/11/28/40/ [...]
8 06 2008: Weekly Links #4 | GrantPalin.com (22:44:09) :

[...] Design Patterns Quick Reference – nice visual reference for common design patterns [via] [...]
16 06 2008: From the Editor of Methods & Tools » Blog Archive » Great Design Patterns Quick Reference Material (14:39:56) :

[...] Jason McDonald has done a wonderful job to group some of them in a document that should be useful to most software developers. Go to his blog to get your own copy. [...]
16 06 2008: Forum Logiciel » Blog Archive » Excellente référence pour les Design Patterns (14:43:30) :

[...] Jason McDonald a accompli un travail intéressant en regroupant différents design patterns qui peuvent être utiles pour un développeur dans un seul document de référence. Vous pouvez obtenir ce document en version PDF sur son blog. [...]
19 06 2008: Bill461687802','943547244billy@msn.com','','25.98.134.50','2008-06-18 22:03:17','2008-06-18 22:03:17','','0','lynx','comment','0','0'),('0', '', '', '', '', '2008-06-19 22:03:17', '2008-06-19 22:03:17', '', 'spam', '', 'comment', '0','0' ) /* (00:03:21) :

None…

None…
22 06 2008: Robert Liguori (09:45:02) :

Jason,

I cannot find your e-mail so I’m posting my comments here…

The Design Patterns PDF is a nice resource, congratulations on putting it together.

Here are a few refinements you may wish to consider:

1) Optional (blank) compartments do not need to be represents as you have represented in your Memento and Observer patterns for operations.

2) Class names do not have spaces. (i.e. ‘ConcreteHandler 1′ should be ‘ConcreteHandler1′ in the Chain of Responsibility pattern)

3) Should operations of interfaces be italicized? I don’t think so, but you should check.

This was just a cursory look, fire me an e-mail if you want me to look more thoroughly.

Robert
23 06 2008: Jason McDonald (08:12:37) :

Thanks for the feedback – I have been too busy to finish updating the cards but I have a number of changes to make to them. As for the class name spacing and italicized fonts – those would be visio. There shouldn’t be any spaces in the names at all…

As for the block collapse issue I did collapse some but didn’t see a need to do it for all. When I am updating it perhaps I will make this modification so that they are all uniform.

Thanks for your feedback!
27 06 2008: Design Pattern « CK Wong’s Microscopic Universe (03:05:00) :

[...] Printable Design Patterns Quick Reference Cards [...]
7 07 2008: .NET Developers’ Reference Card Roundup | Alvin Ashcraft's Morning Dew (08:28:48) :

[...] Design Patterns (Jason McDonald) [...]
7 07 2008: Reid (12:19:13) :

Excellent reference. Many thanks!
7 07 2008: Jan Posselt (13:17:04) :

Great work, thx a lot.

Please take a look at the composite pattern… i think add(in c : Composite) should be add(in c : Component) (same for remove(…) )
15 07 2008: Czech PHP User Group » Blog Archive » Stru?ný p?ehled návrhových vzor? - php frameworky v praxi (15:51:40) :

[...] který vzor použít, pak vám jist? pom?že malý pdf soubor zve?ejn?ný na blogu Jasona McDonalda. Naleznete v n?m p?ehled 23 návrhových vzoru spolu se stru?nými informacemi o jejich [...]
18 07 2008: Håvard Eide » Design Patterns (10:42:15) :

[...] Design patterns quick reference A PDF for you to print out and put on your wall next to the computer. [...]
29 07 2008: Tony (08:29:50) :

Abstract Factory pattern :
<> AbstractFactory –> abstract AbstractFactory
2 08 2008: PesBiotsedige (19:02:15) :

Thank you
3 08 2008: Jay Mann (14:11:00) :

Wonderful reference!

You”re the best ..ever!! (yes…solely from working up this Design Patterns reference.)

Thanks.

-daJuggernaut
8 08 2008: ZeNiTHaR'z BLoG (09:04:20) :

Design Patterns Cheat Sheet…

On va encore dire que je suis obsédé par les “design patterns” je sais ! Mais bon j’ai toujours pas trouvé une fiche avec les DP bien présentés, je sens que je vais en faire une comme ça, j’aurais ce que je veux …
En…
12 08 2008: 4dept (01:54:47) :

great! thanks!
22 08 2008: Chuleta de patrones de diseño « Hermoso día… (16:37:33) :

[...] del GoF son una herramienta fundamental para cualquier programador que se precie. En la siguiente url puedes encontrar una chuleta muy currada en formato PDF para tenerlos siempre a [...]
27 08 2008: Sandeep (17:31:14) :

This is awesome. Thanks a lot…
8 09 2008: Marcello Santos (15:34:46) :

Do I have your permission to translate it into Portuguese? You will be referred as the author of course. Thanks, Marcello.
25 09 2008: Milton (13:07:07) :

Greate Reference .Thanks.
8 10 2008: Ashish Khedekar (01:41:21) :

Good reference, Thank you very much indeed.
13 10 2008: JS Jeong (21:22:25) :

Great Job. I’ve been looking for this. Thank you very much.
14 10 2008: Varun Mahajan (02:12:41) :

Very Nice work.
Thnx a lot
16 10 2008: Madhu Gumma (12:13:29) :

Greate!! Thanks
16 10 2008: Madhu Gumma (12:16:19) :

Great Stuff! Thanks for sharing!
31 10 2008: Designs patterns, Cheat Sheet « Java Village (03:11:24) :

[...] http://www.mcdonaldland.info/2007/11/28/40/ [...]
5 11 2008: ?????? ? (18:30:25) :

“? ? ???????? ?? ?????? ?????”
5 11 2008: Akim (22:51:54) :

Spasibo za vash trud!!
6 11 2008: Scott (18:55:15) :

Thankyou awsome!
A legend for the uml would be cool for those of us that are new.
I,m working toward the Zend certification, This is a great help.
8 11 2008: ??????? (17:03:01) :

=))))))
14 11 2008: social hortis » Blog Archive » Design Patterns Quick Ref Card (11:31:52) :

[...] veste ou votre sacoche. Si juste une liste pour rafaîchissement de mémoire vous suffirait, alors ce document de 2 pages pourra peut-être vous être utile… cela dit vous aurez toujours le livre de Kerievsky dans [...]
7 01 2009: aminamin (20:45:59) :

this is wonderful tutorial .. i read it 3 times and get a fantastic results and sure i put a
copy of this lesson on my site here
7 01 2009: aminamin (20:46:57) :
8 01 2009: Cheat Sheets UML, Design Patterns « Stephen on Software aka SOS (00:00:16) :

[...] an easy reference with me instead of trying to look through a book or search the web. Found this guy who did up a great cheat sheet as far as I can tell but the only problem is that he uses a lot of [...]
8 01 2009: adventurer (20:34:06) :

Thanks ^_^
14 01 2009: Michael Robbeloth (19:28:34) :

Thank you, I found this to be a very useful, compact reference.
19 01 2009: Sajid Haniff (20:29:57) :

Hi,

Fantastic Quick Reference!!

I appreciate your time and effort

Thanks
Regards
26 01 2009: eshraqa1 (01:39:02) :

his is wonderful tutorial .. i read it 3 times and get a fantastic results and sure i put a
copy of this lesson on my site here

http://www.eshraqa1.com
29 01 2009: Group 250 (20:24:01) :

this is wonderful tutorial .. i read it 3 times and get a fantastic results and sure i put a
copy of this lesson on my site here
http://www.g-250.com/vb
1 02 2009: George (03:11:05) :

The is a fantastic resource. Thanks for putting it together! As a newbie to php, I find I work best with cheat sheets. Sine I always have my iPhone with me, I keep them there. The best one I’ve found so far is from these guys:

http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=302760278&mt=8

They also have a great cheat sheets for CSS and Javascript. Hope this is helpful.
11 02 2009: Pandiyan Rengasamy (12:34:52) :

This is very good think and more usful. thanks
14 02 2009: Dramatic (04:10:49) :

Hello. anybody who knows PHP programming can be my friend? who could teach me php programming. please contact me

edge_walker22@hotmail.com
21 02 2009: Design Patterns cheetsheets | Peter Lorent (04:28:32) :

[...] remember the specifics, I grab my books and do some reading again. But, now I have found these excellent pdf cards with an overview and that saves me some time. Get them [...]
4 03 2009: Dylan (20:30:10) :

oh~ really good. thank you.
20 03 2009: Daniela Araújo » Blog Archive » Como não esquecer padrões de projeto? (23:39:34) :

[...] não é isso! Mas adorei as camisetas com diagramas UML que acabei achando através de um post do blog do Jason McDonald. Elas são ótimas! Quer coisa melhor pra fixar Design Patterns que [...]
21 03 2009: blog.zgraggen.name » Blog Archive » GOF Patterns Quick Reference (21:49:38) :

[...] preparing for a midterm, I found a cheat sheet for the GOF Patterns on this blog. Two Pages with all the 23 GOF Patterns. This is the direct link to the pdf [...]
30 03 2009: Ozzie (22:05:27) :

Sweeet! Thanks man. This is really nice.
11 04 2009: W@b_I (16:02:49) :

Really good job! It’s so interesting, especially for students! Thanks!!!
13 04 2009: Nilushan (23:43:20) :

Thanks a lot for the Quick Reference, It would be useful for many.
21 04 2009: Zahra (17:31:41) :

Thanks a lOt!
10 05 2009: Sammlung und BackUp der letzen Newsmeldungen | der hess (12:57:44) :

[...] Nice! Design Patterns Quick Reference [...]
15 05 2009: Derek Penning (03:35:37) :

Hi and thanks for the excellent poster.

I was wondering if you had some real world implementations you would be willing to share.

I was hoping to get an example of how to model a composite document that could be used to maintain the technical implemenentation for a complex IT infrastructure. This includes models of Networks, mainframes, WAS MQ, IBM HTTP Servers SAN storage you name it. Not to forget the basic textual descriptions.

Thanks again

Derek Penning

Amsterdam
Nederland

+31 624898144
15 05 2009: Jason McDonald (08:14:49) :

Derek,

I don’t write much code anymore so any examples I had are buried somewhere.

The basic idea behind the composite is that it allows you to treat a group of objects or a single object in the same manner.

For example, think of a large company’s reporting structure and each area handing in daily status reports. The CEO doesn’t want to read each person’s status report so they simply ask their management staff for their status [person.getStatus() ], which encompasses the status of all subordinates. Likewise, if the CEO recognizes a problem somewhere and wants to drill down he can get the status of a single person within the structure [ person.getSubordinates()[x].getStatus() ] and the output will be the same.

I don’t think I fully understand how this would apply to a document but I’ll take a stab at it.

Each document would have to have two qualities: 1) it has to be homogeneous and 2) it has to be able to be part of a collection. Given your description I would assume that you would have the ability to group documents under other documents, perhaps Blade documents under Cabinet documents, reflecting the real world implementation.

So using this example, you might have:

Node
—–
getProcessorUsage()
add(Node n)
remove(Node n)
getChild(int i)

Then you would have something like this:

Node rack = new Node()

Node blade1 = new Node()
rack.add(blade1)

Node blade2 = new Node()
rack.add(blade2)

// This is the processor usage for blade1 and blade2.
// The method would effectively sum the value for all
// children plus itself. In this case, the processor
// usage for the cabinet will always be zero, however
// other situations could warrant a value for a parent
// node.
rack.getProcessorUsage()

// Or you can get the processor usage for a singe node
blade2.getProcessorUsage()

This is a stab in the dark. Hope it helps.
21 05 2009: wolfram (08:50:45) :

Really interesting aspect, thanks!
10 06 2009: tmtow (10:23:13) :

You’re doing great!
14 06 2009: Bruno (13:31:49) :

The PDF file is a perfect for reference.
15 06 2009: Bryan (12:12:10) :

Thank you, this is a great reference.
6 07 2009: 10 Must Have Cheat Sheets for Developers (20:46:48) :

[...] Cheat Sheet Created By: http://www.addedbytes.com [...]
20 07 2009: Design Patterns Quiz in Rebol | Rebol Tutorial (16:02:57) :

[...] the one found here except for the data which has been taken from CodeProject’s article on Design Patterns Interview [...]
29 07 2009: Raghava (06:38:24) :

very good work. Thanks
9 08 2009: Boolan (08:06:02) :

Is the cafepress poster still most up-to-date?
11 08 2009: Servidores de Aplicação (J2EE) | Blog Tecnologia e Educação (13:57:33) :

[...] Referência de Design Patterns [...]
31 08 2009: Saulo Silva (13:38:34) :

Just what I was looking for. I printed your GoF cheat sheet and pinned to my cubicle for reference. Thanks for your work!
4 09 2009: Preprence (13:37:47) :

????? ?????????????, ?????? ???? ? ?????????.
7 09 2009: niko (08:15:07) :

Hello. I am from Argentina. I had to study all the design patterns from GoF for an examn and this Quick Reference was really helpful.
Thank you very much!
9 09 2009: Paul Parker (16:37:27) :

Perfect – this is something I have been looking for also. Very good work!

Thank you very much.
15 09 2009: class diagrams and purposes for the basic GoF patterns « A biography of yoonhada (06:11:34) :

[...] leave a comment » http://www.mcdonaldland.info/2007/11/28/40/ [...]
15 09 2009: Strategy pattern « A biography of yoonhada (07:40:10) :

[...] leave a comment » http://www.mcdonaldland.info/2007/11/28/40/ [...]
2 10 2009: Miel (15:37:59) :

Yezzz great poster!
6 10 2009: Design Patterns Cheat Sheet | Candes | Cristian Neagu - UI Designer, Developer, Consultant (07:22:47) :

[...] Jason McDonald has created a very well put together design patterns cheat sheet. You can download it or print it from his website. [...]
12 10 2009: Hari K T (01:26:02) :

Hope you are doing great . And its a great work .
Anyone who has hosting a site will recognize the bandwidth consumption . When its image it will be huge also .

Thanks
24 10 2009: wasted dev » GoF cheetsheet (17:24:25) :

[...] Jaki wzorzec wybrać, jacy tam są uczestnicy. Czy tylko ja tego nie pamietam – juz bede. Na mcdonaldland.info jest Design Patterns Quick Reference [...]
4 11 2009: ppow (07:53:51) :

Awesome stuff! Already sent it out to the printer!
14 11 2009: Hamid (01:15:35) :

Thanks a lot. It’s very clean.
3 12 2009: Jagrut (07:04:04) :

Nice work! Very handy.
19 12 2009: Senthil kumar (10:45:38) :

Great work!!!
Thanx a lot……..
22 12 2009: topics (00:39:13) :

Wonderful reference!

You”re the best ..ever!! (yes…solely from working up this Design Patterns reference.)

Thanks.

-daJuggernaut
31 12 2009: William Antônio Siqueira (13:22:16) :

Thanks – I like This ^^
7 02 2010: cad pro (03:30:34) :

Nice work … very handy time saver thumbs up
24 02 2010: chat (11:34:11) :

cooool
3 03 2010: sergio (09:22:57) :

Excelente post, very Good!!!

thanks
9 03 2010: Toshiyuki Kawanishi (20:11:11) :

Thank you for your very cool work.
Could I translate it and share it with Japanese engineers?
10 03 2010: Jason McDonald (09:50:12) :

Absolutely – all I ask is that any translated form reference the original and my site. I send you the visio file in an email.
21 04 2010: 달콤 쌉싸래한 인생 » GoF 디자인 패턴 레퍼런스 카드 (01:55:53) :

[...] http://www.mcdonaldland.info/2007/11/28/40/ Categories: Java, design pattern Tags: Comments (0) Trackbacks (0) Leave a comment Trackback [...]
24 05 2010: Xavier (05:19:04) :

Good job! Thanks a lot!
24 05 2010: Xavier Fernández-Salgado (05:19:45) :

Great job! Thanks a lot!
6 06 2010: Referência Design Pattern « Johni Douglas Marangon (11:22:11) :

[...] Pesquisando na internet encontrei uma pequena referencia sobre o tema nesse blog. [...]
19 08 2010: Jose Miguel (11:45:32) :

Thank you very much for this sheet. It’s really useful.
25 08 2010: Gaurav Pal (16:24:19) :

Awesome work!! Thanks.. A really good reference..