TweetFollow Us on Twitter

November 92 - Pointer-Counterpointer

Pointer-Counterpointer

Eric Berdhal and Jeff Alger

Eric,

    For eight years now, MacApp has been the only game in town. Sure, there's been Smalltalk V/Mac and the Think Class Library, but neither is a serious product for large-scale applications. Suddenly, we're going to have new, high-quality offerings from companies like Symantec, Taligent, Component Software, Visix, Electron Mining (see elsewhere in this issue), and not least Apple. There will be lots of cross-pollenation from technologies like X, Windows, Common Lisp and its bouncing new baby, Dylan, and other AI-derivatives. Where before we had strict parochialism, we will now have routine cross-platform development.

    What we're seeing is the emergence at long last of a competitive market economy in class libraries for the Macintosh. Ironically, it will come about roughly three years after the fall of central planning in eastern Europe, but hey, better late than never. Those of us who have lived with MacApp over the years (and no mistress could have been more loyal or more fickle!) are the keepers of the lore and should pass that lore along to the new generation. So, here goes.

    Apple has invested too little to do the job right but just enough to screw up the third-party market. One has to wonder whether a Taligent-sized effort within Apple years ago wouldn't have obviated the need for Taligent as a separate company. By changing compilers to suit MacApp Apple kept others constantly off-balance in language tools. By providing simplistic tools like ViewEdit, SourceBug, MPW, and MacBrowse free on ETO, but never really finishing them, Apple has hampered third-party vendors and products - Jasik's Debugger, AppMaker, Ad Lib, Object Master, to name just a few - that have consistently been better products, but lacked one critical attribute in the market: the Apple logo. Lurches in direction from version to version and even beta to beta have made it impossible for independent companies to recapture engineering costs. It has also discouraged people from writing books, developing training courses, or providing complementary class libraries. On reflection, I think Apple's resources would have been better used to set standards, enable technologies through technical assistance and seed funding, and provide a marketing umbrella for third-party products.

    As far as technology is concerned, I agree with you that versions 1.x and 2.x were quite well done, but that 3.x is basically a collection of features masquerading as an application framework.

    There were the expected number of misguesses for anything this complex. Compatibility with Object Pascal, in hindsight, was more harmful than helpful and looks a little silly now. Not using C++ version 3.x, pointer-based objects or multiple inheritance also looks increasingly like a big mistake. Backward compatibility with 2.x resulted in lots of redundancy but little benefit.

    There were good concepts backed by poor implementations. Behaviors, adorners, and certain aspects of event dispatch missed the more general (and simpler) principles of delegation and aggregation; they are also unevenly applied. Dependency management never quite settled into a coherent architecture and has been used in some positively bizarre ways. The 2.x view architecture was due for an overhaul and didn't get it. I can't agree with your praise of the dialog architecture, Eric. I'd like to see these areas rethought in future frameworks.

    There are glaring omissions: memory management, including garbage collection; data structures; object persistence and distribution; automated segmentation; data communications; and database support.

    MacApp 3.x suffers from a lack of architectural coherence. Learning MacApp is like walking into a house of mirrors. Eventually you learn your way around, but it's disorienting and you can't trust your senses. Even within MacApp there isn't a great deal of consistency, especially in the use of new features like behaviors, adorners and dependency management. One gets the impression that there just wasn't time to think things through.

    On the other hand, there are some things done very well in 3.x: exception handling, the overall approach to commands and events (though the implementation is not well-factored), instantiate-by-name and other uses of metainformation, support of System 7 features, printing (my favorite!), streams, the menu architecture, and the mechanics of windoids and tear-off menus. These should be studied seriously by any newcomer to the field.

    Despite the problems, I don't blame the MacApp team itself, for they accomplished a remarkable amount with limited resources. On balance, I'd grant an A+ for effort but only C++ for the outcome and a generous D for Apple management. The new kids on the block would be well-advised to study the reasons.

Jeff

Friend Jeff,

    I've been thinking over the conversations we've had about MacApp over the years, and we have had some barn burners, haven't we? Now that Apple is moving beyond MacApp, we have something new to consider: What can we learn from MacApp and take with us to the future?

    One thing I've always admired about MacApp is its vision and philosophy. I think the first thing I liked about MacApp was that is was a decent factoring of a Macintosh application. Even back in the days of MacApp 1.x, there were interesting features aimed at being factors of a Mac App: a rudimentary document structure, an encapsulation of a display, and some basic support for utility objects like lists.

    When MacApp turned 2.x, there was yet another factoring of a Mac App, one that was significantly different and better. The document structure was still not fantastic, but it did exist and allowed basic default functionality to be easily accessed. The hierarchical view system modeled the way developers want to display information fairly well. In many ways, the 2.x cycle brought MacApp close to a quantum leap in technology, where software development could truly leverage object technology.

    Then came 3.x. Unfortunately, I think 3.x consists of a variety of features that were grafted onto 2.x technology. MacApp deserved better and could have easily been the unarguably superior development environment. As it is it's still head and shoulders above the crowd, but the question remains: What can we learn from MacApp? More importantly, what is MacApp? Once we have the answer to that question, I think the rest will come easily.

    I see MacApp as a collection of interesting features, a few frameworks, and a couple architectures all thrown together in a package. In short order, here's the way I view the MacApp world.

    One of the oldest and most interesting architectures I see in MacApp is the View architecture. Although it is essentially unchanged since 2.x, it is still a fine piece of work. Views allow developers to display information to the user in a rather rich format. Look at this, now I'm spewing Apple marketing information at you.

    Built on this architecture is what is possibly one of the best ideas to come around, MacApp dialogs. After doing dialogs with MacApp, I can't see going back to using the toolbox. MacApp actually makes it rather pleasant to deal with this score. Well, I like it anyway.

    Then there are adorners. These objects, really lightweight views, look like an interesting experiment, but I'm not sure it was a success. I've always thought that they were too light to be true lightweight views and too heavy to just adorn a view. I'm also not thrilled that they require so much direct support from the view system, almost like they were shoe horned into place. Behaviors, yet another MacApp feature, have many of the same problems, but I feel less strongly about them.

    The other framework that is really cool is the command structure. How else do you encapsulate the Macintosh undo metaphor? This is a textbook example of how simple, obvious classes can solve what would otherwise be exceedingly difficult problems. What MacApp has done is even more impressive, setting the commands as the basic unit of work in an application.

    Then there are systems and architectures that are expected to be found in a mature object system. MacApp implements very nice access to the metainformation available from Object Pascal. Dependency management and a stream architecture is another one of those features you get used to seeing in object based systems. MacApp's implementation of these isn't entirely world class, but they are very usable even though they're not completely integrated into the underlying MacApp frameworks.

    Finally, MacApp has a lot of debugging and antibugging code. Another thing that MacApp dealt with mostly head on is the admission that exception handling has to be a part of the mainstream code of an application. The consequence is that debugging code and failure handling permeates MacApp and MacApp based applications, something noticeably absent elsewhere.

    So, with all these pieces, we should be able to find something that we can take with us, either in code, analysis, or lessons.

Stirring regards,
Eric

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Coda 2.5.11 - One-window Web development...
Coda is a powerful Web editor that puts everything in one place. An editor. Terminal. CSS. Files. With Coda 2, we went beyond expectations. With loads of new, much-requested features, a few surprises... Read more
Bookends 12.5.7 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Access the power of Bookends directly from Mellel, Nisus Writer Pro, or MS Word (... Read more
Maya 2016 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more
RapidWeaver 6.2.3 - Create template-base...
RapidWeaver is a next-generation Web design application to help you easily create professional-looking Web sites in minutes. No knowledge of complex code is required, RapidWeaver will take care of... Read more
MacFamilyTree 7.5.2 - Create and explore...
MacFamilyTree gives genealogy a facelift: it's modern, interactive, incredibly fast, and easy to use. We're convinced that generations of chroniclers would have loved to trade in their genealogy... Read more
Paragraphs 1.0.1 - Writing tool just for...
Paragraphs is an app just for writers. It was built for one thing and one thing only: writing. It gives you everything you need to create brilliant prose and does away with the rest. Everything in... Read more
BlueStacks App Player 0.9.21 - Run Andro...
BlueStacks App Player lets you run your Android apps fast and fullscreen on your Mac. Version 0.9.21: Note: Now requires OS X 10.8 or later running on a 64-bit Intel processor. Initial stable... Read more
Tweetbot 2.0.2 - Popular Twitter client....
Tweetbot is a full-featured OS X Twitter client with a lot of personality. Whether it's the meticulously-crafted interface, sounds and animation, or features like multiple timelines and column views... Read more
Apple iBooks Author 2.3 - Create and pub...
Apple iBooks Author helps you create and publish amazing Multi-Touch books for iPad. Now anyone can create stunning iBooks textbooks, cookbooks, history books, picture books, and more for iPad. All... Read more
NeoOffice 2014.12 - Mac-tailored, OpenOf...
NeoOffice is a complete office suite for OS X. With NeoOffice, users can view, edit, and save OpenOffice documents, PDF files, and most Microsoft Word, Excel, and PowerPoint documents. NeoOffice 3.x... Read more

Rage of Bahamut is Giving Almost All of...
The App Store isn't what it used to be back in 2012, so it's not unexpected to see some games changing their structures with the times. Now we can add Rage of Bahamut to that list with the recent announcement that the game is severely cutting back... | Read more »
Adventures of Pip (Games)
Adventures of Pip 1.0 Device: iOS iPhone Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: ** ONE WEEK ONLY — 66% OFF! *** “Adventures of Pip is a delightful little platformer full of charm, challenge and impeccable... | Read more »
Divide By Sheep - Tips, Tricks, and Stre...
Who would have thought splitting up sheep could be so involved? Anyone who’s played Divide by Sheep, that’s who! While we’re not about to give you complete solutions to everything (because that’s just cheating), we will happily give you some... | Read more »
NaturalMotion and Zynga Have Started Tea...
An official sequel to 2012's CSR Racing is officially on the way, with Zynga and NaturalMotion releasing a short teaser trailer to get everyone excited. Well, as excited as one can get from a trailer with no gameplay footage, anyway. [Read more] | Read more »
Grab a Friend and Pick up Overkill 3, Be...
Overkill 3 is a pretty enjoyable third-person shooter that was sort of begging for some online multiplayer. Fortunately the begging can stop, because its newest update has added an online co-op mode. [Read more] | Read more »
Scanner Pro's Newest Update Adds Au...
Scanner Pro is one of the most popular document scanning apps on iOS, thanks in no small part to its near-constant updates, I'm sure. Now we're up to update number six, and it adds some pretty handy new features. [Read more] | Read more »
Heroki (Games)
Heroki 1.0 Device: iOS Universal Category: Games Price: $7.99, Version: 1.0 (iTunes) Description: CLEAR THE SKIES FOR A NEW HERO!The peaceful sky village of Levantia is in danger! The dastardly Dr. N. Forchin and his accomplice,... | Read more »
Wars of the Roses (Games)
Wars of the Roses 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: | Read more »
TapMon Battle (Games)
TapMon Battle 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: It's time to battle!Tap! Tap! Tap! Try tap a egg to hatch a Tapmon!Do a battle with another tapmons using your hatched tapmons! *... | Read more »
Alchemic Dungeons (Games)
Alchemic Dungeons 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: ### Release Event! ### 2.99$->0.99$ for limited time! ### Roguelike Role Playing Game! ### Alchemic Dungeons is roguelike... | Read more »

Price Scanner via MacPrices.net

Canon PIXMA MG3620 Wireless Inkjet All-in-One...
Canon U.S.A., Inc. has announced the PIXMA MG3620 Wireless (1) Inkjet All-in-One (AIO) printer for high-quality photo and document printing. Built with convenience in mind for the everyday home user... Read more
July 4th Holiday Weekend 13-inch MacBook Pro...
Save up to $150 on the purchase of a new 2015 13″ Retina MacBook Pro at the following resellers this weekend. Shipping is free with each model: 2.7GHz/128GB MSRP $1299 2.7GHz/... Read more
27-inch 3.5GHz 5K iMac on sale for $2149, sav...
Best Buy has the 27″ 3.5GHz 5K iMac on sale for $2149.99. Choose free shipping or free local store pickup (if available). Sale price for online orders only, in-store prices may vary. Their price is $... Read more
Apple now offering refurbished 2015 11-inch...
The Apple Store is now offering Apple Certified Refurbished 2015 11″ MacBook Airs as well as 13″ MacBook Airs (the latest models), available for up to $180 off the cost of new models. An Apple one-... Read more
15-inch 2.5GHz Retina MacBook Pro on sale for...
Amazon.com has the 15″ 2.5GHz Retina MacBook Pro on sale for $2274 including free shipping. Their price is $225 off MSRP, and it’s the lowest price available for this model. Read more
Finally Safe To Upgrade To Yosemite’?
The reason I’ve held back from upgrading my MacBook Air from OS X 10.9 Mavericks to 10.10 Yosemite for nearly a year isn’t just procrastination. Among other bugs reported, there have been persistent... Read more
Logo Pop Free Vector Logo Design App For OS X...
128bit Technologies has released of Logo Pop Free 1.2 for Mac OS X, a vector based, full-fledged, logo design app available exclusively on the Mac App Store for the agreeable price of absolutely free... Read more
21-inch 1.4GHz iMac on sale for $999, save $1...
B&H Photo has new 21″ 1.4GHz iMac on sale for $999 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Best Buy has the 21″ 1.4GHz iMac on sale for $999.99 on their... Read more
16GB iPad mini 3 on sale for $339, save $60
B&H Photo has the 16GB iPad mini 3 WiFi on sale for $339 including free shipping plus NY tax only. Their price is $60 off MSRP. Read more
Save up to $40 on iPad Air 2, NY tax only, fr...
B&H Photo has iPad Air 2s on sale for up to $40 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $489 $10 off - 64GB iPad Air 2 WiFi: $559 $40 off - 128GB iPad Air... Read more

Jobs Board

*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
*Apple* Fulfillment Operations Execution Ana...
**Job Summary** The AMR Apple Fulfillment Operations Team is seeking a talented team player to drive the Apple Online Store (AOS) fulfillment performance to ensure a Read more
Localization Producer - *Apple* HR and Reta...
…project manager to support the Retail Globalization team. You will participate in Apple exponential inte ational growth and drive global project initiatives for the Read more
*Apple* Online Store UAT Lead - Apple (Unite...
**Job Summary** The Apple Online Store is a fast paced and ever evolving business environment. A UAT lead in this organization is able to have a direct impact on one of Read more
Senior Payments Security Manager - *Apple*...
**Job Summary** Apple , Inc. is looking for a highly motivated, innovative and hands-on senior payments security manager to join the Apple Pay security team. You will Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.