Some libraries do use it but also have a fallback code.
For the performance aspect: this is just used to register the class byte[] in an existing ClassLoader. The ClassLoader base classe uses sun.misc.Unsafe _internally_ anyway. So I really don't think there will be much difference. LieGrue, strub ----- Original Message ----- > From: Romain Manni-Bucau <rmannibu...@gmail.com> > To: dev@openejb.apache.org; Mark Struberg <strub...@yahoo.de> > Cc: > Sent: Monday, December 31, 2012 1:21 PM > Subject: Re: ASM proxy improvement > > so no library is portable, that's my point... > > grepcode Unsafe and you'll understand > > but well if you manage to not use it keeping the same perf that's perfect > > Romain Manni-Bucau > Twitter: @rmannibucau > Blog: http://rmannibucau.wordpress.com/ > LinkedIn: http://fr.linkedin.com/in/rmannibucau > Github: https://github.com/rmannibucau > > > > 2012/12/31 Mark Struberg <strub...@yahoo.de>: >> Nope, Unsafe is gory bull****t :) >> >> >> There is only one situation where you still need it: if you manually pack > constant definitions in an existing class. But this is highly non-portable. >> >> LieGrue, >> strub >> >> >> >> ----- Original Message ----- >>> From: Romain Manni-Bucau <rmannibu...@gmail.com> >>> To: dev@openejb.apache.org; Mark Struberg <strub...@yahoo.de> >>> Cc: >>> Sent: Monday, December 31, 2012 12:20 PM >>> Subject: Re: ASM proxy improvement >>> >>> Hi Mark, >>> >>> unsafe is used in all frameworks so i'd consider it as safe ;) >>> >>> Romain Manni-Bucau >>> Twitter: @rmannibucau >>> Blog: http://rmannibucau.wordpress.com/ >>> LinkedIn: http://fr.linkedin.com/in/rmannibucau >>> Github: https://github.com/rmannibucau >>> >>> >>> >>> 2012/12/31 Mark Struberg <strub...@yahoo.de>: >>>> hi folks! >>>> >>>> While looking at the ASM proxy David imported to OWB I saw that > it's >>> based on the sun.misc.Unsafe class. >>>> This makes this approach non-portable to other JVMs. >>>> >>>> I now played around with an alternative way to do the same: I just > invoke >>> the protected ClassLoader#defineClass method via reflection instead. In > my tests >>> this works pretty well already. See defineAndLoadClass in [1]. Maybe I > can even >>> remove the 2nd explicit loadClass. It also works without in java6 but > the docs >>> says that the class is only available after doing a loadClass. Would > need some >>> more tests to make sure it also works portable without this redundant > call. >>>> >>>> Happy about any feedback. >>>> >>>> >>>> LieGrue, >>>> strub >>>> >>>> >>>> [1] >>> > http://svn.apache.org/repos/asf/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/proxy/asm/InterceptorDecoratorProxyFactory.java >>>> >>> >
