On 24/03/2016 11:41, Jim Starkey wrote: > On 3/24/2016 9:24 AM, Adriano dos Santos Fernandes wrote: >> On 08/03/2016 10:02, Dmitry Yemanov wrote: >>> All, >>> >>> The good thing is that the code internals are more or less ready to work >>> with context/stream number of any size, thanks to Claudio's refactoring. >>> So the issue is mostly about BLR. >>> >>> I see two possible solutions: >>> >>> 1) Bump BLR version, make all context-aware verbs to generate/parse >>> longer numbers (prefixed by counter, variable-length encoded, whatever) >>> if new BLR version is used. Support old BLR versions, for sure (for >>> migration, message descriptions, etc) but generate new BLR version for >>> new objects. >>> >>> The major problem here is backward compatibility. BLR version 6 cannot >>> be parsed by prior engines, so backward migration via gbak becomes >>> impossible (at least after some metadata have been modified in FB4). >>> >> If we use the new version only when the object actually uses more than >> 255 contexts, it's an object that cannot be really migrated backward. >> >> But maybe instead of change the version, we can introduce BLR flags. By >> default, a backward-compatible object would not generate any flag and >> then generates the same BLR when created. >> >> The initial BLR flag we could create is: >> >> blr_flag, blr_flag_large_context_space >> >> > Adding the flag would break backwards compatibility, so it's a > non-starter.
No. Read again. > Creating a new BLR version number doesn't make sense since > it is hoped that future versions of Firebird will treat BLR as at most a > legacy interface. > So you suggest Java .class go away? Compile source code dynamically and run? Same for C++? No binary anymore? Adriano ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785351&iu=/4140 Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
