Dr. Dobb's Journal - November 2007 - (Page 49) d11vaugh_p5db 9/17/07 8:43 AM Page 49 Listing Three var MyObj = { MyMethod : function () { } }; function Proxy () { } MyObj["MyMethod"] = Proxy; MyObj.MyMethod (); // Define the object literally // Define a method // Define our interloper // Replace the reference // Unbeknownst to the caller, // Proxy will now execute the interceptee. Listing Five (available online; see “Resource Center,” page 5) demonstrates this. AspectJS The reality is that function interception in JavaScript constitutes a form of metaprogramming in an interpreted language, and has many aspect-oriented applications beyond loading on demand. Given that wider context, you can view a call to a library-loader as a “prefix” to the interceptee, and this introduces the notion of functions that act as “suffixes,” where a method is called after, rather than before, the invocation of the interceptee. This leads to the notion of “wrapping” an interceptee with such affixes, which leads from there to the question of affix lifetime. In the on-demand example, the prefix executes just once before it is detached, but there may be instances where an affix should execute for a certain number of times, or even infinitely; the ability to remove an affix explicitly is also desirable. Moreover, multiple affixes may be desirable—in Listing Two there are three loading calls, which suggests applying three discrete prefixes to DisplayMenu, and this introduces the notion of changing their execution order if needed. Then there is the question of exception handling, error checking, and diagnostics, as well as performance, all of which raise significant design questions. A clear case exists, therefore, for a generalpurpose function-interception library that addresses these points, thereby obviating reinvention of the wheel; and AspectJS (www .dodeca.co.uk/ajs_About_AspectJS.htm) is one such resource that is freely available. Encapsulating the mechanics of function November 2007 l www.ddj.com l Dr. Dobb’s Journal 49 http://www.dynamicpdf.com http://www.dynamicpdf.com http://www.cete.com http://www.dodeca.co.uk/ajs_About_AspectJS.htm http://www.dodeca.co.uk/ajs_About_AspectJS.htm http://www.cete.com http://www.ddj.com
Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - November 2007 Contents Hmmmm Alia Vox Developer Diaries Developer’s Notebook Smart Compilers - But Smart Enough? Conversations Grid-Enabling Resource-Intensive Applications Distributed Computing: Windows and Linux Adobe AIR: Desktop/Web Convergence Transparency on Demand Reusable Associations Effective Concurrency The Agile Edge Swaine’s Flames Dr. Dobb's Journal - November 2007 Dr. Dobb's Journal - November 2007 - (Page Cover1) Dr. Dobb's Journal - November 2007 - (Page Cover2) Dr. Dobb's Journal - November 2007 - (Page 1) Dr. Dobb's Journal - November 2007 - (Page 2) Dr. Dobb's Journal - November 2007 - (Page 3) Dr. Dobb's Journal - November 2007 - Contents (Page 4) Dr. Dobb's Journal - November 2007 - Contents (Page 5) Dr. Dobb's Journal - November 2007 - Hmmmm (Page 6) Dr. Dobb's Journal - November 2007 - Hmmmm (Page 7) Dr. Dobb's Journal - November 2007 - Hmmmm (Page 8) Dr. Dobb's Journal - November 2007 - Hmmmm (Page 9) Dr. Dobb's Journal - November 2007 - Alia Vox (Page 10) Dr. Dobb's Journal - November 2007 - Alia Vox (Page 11) Dr. Dobb's Journal - November 2007 - Developer Diaries (Page 12) Dr. Dobb's Journal - November 2007 - Developer Diaries (Page 13) Dr. Dobb's Journal - November 2007 - Developer’s Notebook (Page 14) Dr. Dobb's Journal - November 2007 - Developer’s Notebook (Page 15) Dr. Dobb's Journal - November 2007 - Smart Compilers - But Smart Enough? (Page 16) Dr. Dobb's Journal - November 2007 - Smart Compilers - But Smart Enough? (Page 17) Dr. Dobb's Journal - November 2007 - Smart Compilers - But Smart Enough? (Page 18) Dr. Dobb's Journal - November 2007 - Smart Compilers - But Smart Enough? (Page 19) Dr. Dobb's Journal - November 2007 - Conversations (Page 20) Dr. Dobb's Journal - November 2007 - Conversations (Page 21) Dr. Dobb's Journal - November 2007 - Grid-Enabling Resource-Intensive Applications (Page 22) Dr. Dobb's Journal - November 2007 - Grid-Enabling Resource-Intensive Applications (Page 23) Dr. Dobb's Journal - November 2007 - Grid-Enabling Resource-Intensive Applications (Page 24) Dr. Dobb's Journal - November 2007 - Grid-Enabling Resource-Intensive Applications (Page 25) Dr. Dobb's Journal - November 2007 - Grid-Enabling Resource-Intensive Applications (Page 26) Dr. Dobb's Journal - November 2007 - Grid-Enabling Resource-Intensive Applications (Page 27) Dr. Dobb's Journal - November 2007 - Grid-Enabling Resource-Intensive Applications (Page 28) Dr. Dobb's Journal - November 2007 - Grid-Enabling Resource-Intensive Applications (Page 29) Dr. Dobb's Journal - November 2007 - Distributed Computing: Windows and Linux (Page 30) Dr. Dobb's Journal - November 2007 - Distributed Computing: Windows and Linux (Page 31) Dr. Dobb's Journal - November 2007 - Distributed Computing: Windows and Linux (Page 32) Dr. Dobb's Journal - November 2007 - Distributed Computing: Windows and Linux (Page 33) Dr. Dobb's Journal - November 2007 - Distributed Computing: Windows and Linux (Page 34) Dr. Dobb's Journal - November 2007 - Distributed Computing: Windows and Linux (Page 35) Dr. Dobb's Journal - November 2007 - Adobe AIR: Desktop/Web Convergence (Page 36) Dr. Dobb's Journal - November 2007 - Adobe AIR: Desktop/Web Convergence (Page 37) Dr. Dobb's Journal - November 2007 - Adobe AIR: Desktop/Web Convergence (Page 38) Dr. Dobb's Journal - November 2007 - Adobe AIR: Desktop/Web Convergence (Page 39) Dr. Dobb's Journal - November 2007 - Adobe AIR: Desktop/Web Convergence (Page 40) Dr. Dobb's Journal - November 2007 - Adobe AIR: Desktop/Web Convergence (Page 41) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 42) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 43) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 44) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 45) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 46) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 47) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 48) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 49) Dr. Dobb's Journal - November 2007 - Transparency on Demand (Page 50) Dr. Dobb's Journal - November 2007 - Reusable Associations (Page 51) Dr. Dobb's Journal - November 2007 - Reusable Associations (Page 52) Dr. Dobb's Journal - November 2007 - Reusable Associations (Page 53) Dr. Dobb's Journal - November 2007 - Reusable Associations (Page 54) Dr. Dobb's Journal - November 2007 - Reusable Associations (Page 55) Dr. Dobb's Journal - November 2007 - Reusable Associations (Page 56) Dr. Dobb's Journal - November 2007 - Effective Concurrency (Page 57) Dr. Dobb's Journal - November 2007 - Effective Concurrency (Page 58) Dr. Dobb's Journal - November 2007 - Effective Concurrency (Page 59) Dr. Dobb's Journal - November 2007 - The Agile Edge (Page 60) Dr. Dobb's Journal - November 2007 - The Agile Edge (Page 61) Dr. Dobb's Journal - November 2007 - The Agile Edge (Page 62) Dr. Dobb's Journal - November 2007 - The Agile Edge (Page 63) Dr. Dobb's Journal - November 2007 - Swaine’s Flames (Page 64) Dr. Dobb's Journal - November 2007 - Swaine’s Flames (Page Cover3) Dr. Dobb's Journal - November 2007 - Swaine’s Flames (Page Cover4)
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