Sure, I will find the code again and post it somewhere. It is just a bunch of prototype code, but here is the gist:
I search all of the classes and I find all matching metadata, for example properties noted with [Inject]. I build a small class that has a reference to each of these classes, along with the list of properties and, for my particular use case, some information about types and constructor arguments. Then I wrap that with an API that allows it to be queried. It does carry some overhead in a variety of ways but a lot of it just ends up being references to the constant pool. Since I reference that class early, it forces everything else to be touched, etc., however, subsequent looks ups don't require a describeType and are very fast. I was trying to make dependency injection much faster and I was limiting the metadata to injection points. I am not saying we would want to map every piece of metadata in the system this way. In either case, it sped the DI process up a whole lot as I knew what was required of the constructor and any fields ahead of time and I could do fully recursive introspected injection with a minimal performance hit. Mike -----Original Message----- From: omup...@gmail.com [mailto:omup...@gmail.com] On Behalf Of Om Sent: Tuesday, January 24, 2012 5:54 PM To: flex-dev@incubator.apache.org Subject: Re: metadata Bumping this thread. Michael, your note about post-processing metadata into an actionscript class and hence speeding things up without having to use describeType() sounds very interesting. Can you please post more info? I always wondered about how using descriptType() affects performance. Your results could be enlightening. If we really get such a good performance boost, I am all for adding this as a feature in our new Apache Flex. Thanks, Om On Sun, Jan 22, 2012 at 11:10 PM, Bogdan DINU <flex.programm...@gmail.com>wrote: > Hi Michael, > > would you care to share a link of your experiment sources? :) We might > all learn something from it. > > Thanks in advance! > > Best regards, > Bogdan > > On Sun, Jan 22, 2012 at 10:00 PM, Michael A. Labriola < > labri...@digitalprimates.net> wrote: > > > I did some experiments a while back where I post-processed metadata > > into > a > > ActionScript class and then included it in compilation. Basically, I > > had > a > > class that referenced all places a given metadata tag was being used > (like > > for injection points). Versus using describeType, I could speed up > > things like robot legs nearly 10 fold. > > > > Mike > > > > > > -----Original Message----- > > From: Michael A. Labriola [mailto:labri...@digitalprimates.net] > > Sent: Sunday, January 22, 2012 1:58 PM > > To: flex-dev@incubator.apache.org > > Subject: RE: metadata > > > > There was a compiler change a while back. Basically, if a library > > forces > a > > given piece of metadata to be kept, then that setting is inherited > > by the project. So, when flexunit forces [Test] to be kept in the > > library, all projects that include flexunit's swc get that setting > > > > -----Original Message----- > > From: Michael Schmalle [mailto:m...@teotigraphix.com] > > Sent: Saturday, January 21, 2012 5:21 AM > > To: flex-dev@incubator.apache.org > > Subject: Re: metadata > > > > Quoting Martin Heidegger <m...@leichtgewicht.at>: > > > > > @Michael: Wasn't there some kind of compiler change regarding this? > > > I can't properly recall it. > > > > > > However: As far as I know: the standard meta tags (like bindable) > > > do get compiled into the code and are readable with describeType. > > > swfs are readable like external files with the proper tools, which > > > is why swc inspection works in FlexBuilder, FDT, etc. If you put > > > them in an external file you'd make it easier to tamper and break running > > > code. > > > > > > yours > > > Martin. > > > > > > > The Bindable etc, are included in the main build. > > > > whiteboard/frameworks/build_framework.xml > > > > In the core, framework and mx targets. > > > > <compc ... > > <keep-as3-metadata name="Bindable"/> > > <keep-as3-metadata name="Managed"/> > > <keep-as3-metadata name="ChangeEvent"/> > > <keep-as3-metadata name="NonCommittingChangeEvent"/> > > <keep-as3-metadata name="Transient"/> </compc> > > > > > > As far as the compiler change, I don't know. > > > > Mike > > > > Notice: This transmission is intended only for the use of the > > individual or entity to which it is addressed and may contain > > information that is privileged or confidential. Any dissemination, > > distribution or copying of this transmission by anyone other than > > the intended recipient is strictly prohibited. If you have received > > this transmission in error, please > notify > > the sender immediately by e-mail or telephone and delete the > > original transmission. Thank you. > > > > > > -- > http://www.badu.ro >
