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• CQRS applicability when some commands need to block the UI

  - by regularfry

  I am working on an app which I would dearly love to transition from a fairly traditional layered architecture to CQRS, for a number of reasons, not least fo which is that having a robust event log will make adding a couple of feature requests I can see barrelling towards me trivial to accomodate. Now, I have a conceptual problem: of around 40 commands the user can initiate, there are three which the user needs to be sure have successfully completed before the UI lets them do anything else. Everything else fits into the "submit a request, query for success later" model, except for these three commands. How is this handled in CQRS-land? Do I separate the three blocking commands to effectively a third service, so I have Commands, Queries, and BlockingCommands? Do I have a two-stage event processor with an in-request blocking first stage which only gets used for the blocking commands? Does the existence of these three commands mean that the whole idea of applying CQRS is invalid? Should I just pretend they aren't blocking and poll for success in the UI? I'm sure this must come up on other projects, how is it usually handled?

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• Do you sign each of your source files with your name? [duplicate]

  - by regularfry

  Possible Duplicate: How do you keep track of the authors of code? One of my colleagues is in the habit of putting his name and email address in the head of each source file he works on, as author metadata. I am not; I prefer to rely on source control to tell me who I should be speaking to about a given set of functionality. Should I also be signing files I work on for any other reasons? Do you? If so, why? To be clear, this is in addition to whatever metadata for copyright and licensing information is included, and applies to both open sourced and proprietary code.

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• Debian Squeeze locale settings

  - by regularfry

  I have a problem with a slightly customised Debian image that I'm trying to do some headless work on. The problem is that the installed locales list has been reduced to this: C en_GB en_GB.iso88591 en_GB.iso885915 en_GB.utf8 POSIX However, when I log in as root (with an otherwise as-vanilla profile), I find this: ~# set | grep LC_ LC_CTYPE=en_US.UTF-8 That's the only LC_ environment variable set, and presumably that means that it's being explicitly set somewhere (and given that /etc/default/locale only contains LANG=en_GB, I can't see any other alternative). However, I can't see where it is being set, and the fact that it's wrong is preventing, for example, postgresql-8.4 from installing. I know I can do an LC_CTYPE=en_GB apt-get install postgresql-8.4 to work around this, but I'd really like to understand where this setting comes from, and I really dislike the idea of installing an otherwise-unnecessary locale to make this go away. So: where does this LC_CTYPE setting come from, and how do I make it go away?

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• Files under Program Files have a split personality

  - by regularfry

  I have a Ruby application I'm installing (along with a packaged ruby interpreter) under Program Files on Windows 7 with an NSIS-built installer. In order to debug it, I edited one of the files to add some debugging statements. After that, I uninstalled the package and ran a new version of the installer which includes a new copy of the edited file, without debugging statements. Now, I can't get the new copy to load into ruby. If I run type <filename> in cmd.exe, or open the file in Notepad.exe or Firefox, I see the new version. If I run ruby -e "puts File.read('<filename>')", or open the file in emacs, I see the old version. If, in Windows Explorer, I copy the file to a new filename, everything can see the new contents at that filename. If I delete the original file and rename the copy to replace the original, the split personality returns. This situation survives a reboot, so it's not a simple matter of a file being accidentally held open. What on earth is going on here? Is there some aspect of the install process that might be checkpointing the file in a way I can revert, or at least switch off while I'm debugging the installer?

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• Data-only static libraries with GCC

  - by regularfry

  How can I make static libraries with only binary data, that is without any object code, and make that data available to a C program? Here's the build process and simplified code I'm trying to make work: ./datafile: abcdefghij Makefile: libdatafile.a: ar [magic] datafile main: libdatafile.a gcc main.c libdatafile.a -o main main.c: #define TEXTPTR [more magic] int main(){ char mystring[11]; memset(mystring, '\0', 11); memcpy(TEXTPTR, mystring, 10); puts(mystring); puts(mystring); return 0; } The output I'm expecting from running main is, of course: abcdefghijabcdefghij My question is: what should [magic] and [more magic] be?

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