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• Rails message: ActionView::MissingTemplate

  - by rtfminc

  I am getting an error that I cannot figure out: ActionView::MissingTemplate (Missing template cluster/delete_stuff.erb in view path app/views) <...snip trace...> Rendering rescues/layout (internal_server_error) I am "enhancing" others code and am following the convention they set up, where they have have code like: <%= render :partial => "other_stuff" %> And a file named _other_stuff.html.erb and it all works, but when I copy these little snippets, I get the above error. Any ideas? Something is going on here that I need to figure out.

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• Python hashable dicts

  - by TokenMacGuy

  As an exercise, and mostly for my own amusement, I'm implementing a backtracking packrat parser. The inspiration for this is i'd like to have a better idea about how hygenic macros would work in an algol-like language (as apposed to the syntax free lisp dialects you normally find them in). Because of this, different passes through the input might see different grammars, so cached parse results are invalid, unless I also store the current version of the grammar along with the cached parse results. (EDIT: a consequence of this use of key-value collections is that they should be immutable, but I don't intend to expose the interface to allow them to be changed, so either mutable or immutable collections are fine) The problem is that python dicts cannot appear as keys to other dicts. Even using a tuple (as I'd be doing anyways) doesn't help. >>> cache = {} >>> rule = {"foo":"bar"} >>> cache[(rule, "baz")] = "quux" Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unhashable type: 'dict' >>> I guess it has to be tuples all the way down. Now the python standard library provides approximately what i'd need, collections.namedtuple has a very different syntax, but can be used as a key. continuing from above session: >>> from collections import namedtuple >>> Rule = namedtuple("Rule",rule.keys()) >>> cache[(Rule(**rule), "baz")] = "quux" >>> cache {(Rule(foo='bar'), 'baz'): 'quux'} Ok. But I have to make a class for each possible combination of keys in the rule I would want to use, which isn't so bad, because each parse rule knows exactly what parameters it uses, so that class can be defined at the same time as the function that parses the rule. But combining the rules together is much more dynamic. In particular, I'd like a simple way to have rules override other rules, but collections.namedtuple has no analogue to dict.update(). Edit: An additional problem with namedtuples is that they are strictly positional. Two tuples that look like they should be different can in fact be the same: >>> you = namedtuple("foo",["bar","baz"]) >>> me = namedtuple("foo",["bar","quux"]) >>> you(bar=1,baz=2) == me(bar=1,quux=2) True >>> bob = namedtuple("foo",["baz","bar"]) >>> you(bar=1,baz=2) == bob(bar=1,baz=2) False tl'dr: How do I get dicts that can be used as keys to other dicts? Having hacked a bit on the answers, here's the more complete solution I'm using. Note that this does a bit extra work to make the resulting dicts vaguely immutable for practical purposes. Of course it's still quite easy to hack around it by calling dict.__setitem__(instance, key, value) but we're all adults here. class hashdict(dict): """ hashable dict implementation, suitable for use as a key into other dicts. >>> h1 = hashdict({"apples": 1, "bananas":2}) >>> h2 = hashdict({"bananas": 3, "mangoes": 5}) >>> h1+h2 hashdict(apples=1, bananas=3, mangoes=5) >>> d1 = {} >>> d1[h1] = "salad" >>> d1[h1] 'salad' >>> d1[h2] Traceback (most recent call last): ... KeyError: hashdict(bananas=3, mangoes=5) based on answers from http://stackoverflow.com/questions/1151658/python-hashable-dicts """ def __key(self): return tuple(sorted(self.items())) def __repr__(self): return "{0}({1})".format(self.__class__.__name__, ", ".join("{0}={1}".format( str(i[0]),repr(i[1])) for i in self.__key())) def __hash__(self): return hash(self.__key()) def __setitem__(self, key, value): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def __delitem__(self, key): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def clear(self): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def pop(self, *args, **kwargs): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def popitem(self, *args, **kwargs): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def setdefault(self, *args, **kwargs): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def update(self, *args, **kwargs): raise TypeError("{0} does not support item assignment" .format(self.__class__.__name__)) def __add__(self, right): result = hashdict(self) dict.update(result, right) return result if __name__ == "__main__": import doctest doctest.testmod()

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• mutidimensional array from javascript/jquery to ruby/sinatra

  - by user199368

  Hi, how do I pass a 2-dimensional array from javascript to ruby, please? I have this on client side: function send_data() { var testdata = { "1": { "name": "client_1", "note": "bigboy" }, "2": { "name": "client_2", "note": "smallboy" } } console.log(testdata); $.ajax({ type: 'POST', url: 'test', dataType: 'json', data: testdata }); } and this on server side: post '/test' do p params end but I can't get it right. The best I could get on server side is something like {"1"=>"[object Object]", "2"=>"[object Object]"} I tried to add JSON.stringify on client side and JSON.parse on server side, but the first resulted in {"{\"1\":{\"name\":\"client_1\",\"note\":\"bigboy\"},\"2\":{\"name\":\"client_2\",\"note\":\"smallboy\"}}"=>nil} while the latter has thrown a TypeError - can't convert Hash into String. Could anyone help, or maybe post a short snippet of correct code, please? Thank you

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• Thoughts on security model to store credit card details

  - by Faisal Abid

  Here is the model we are using to store the CC details how secure does this look? All our information is encrypted using public key encryption and the keypair is user dependent (its generated on the server and the private key is symmetric encrypted using the users password which is also Hashed on the database) So basically on first run the user sends in his password via a SSL connection and the password is used with the addition of salt to generate an MD5 hash, also the password is used to encrypt the private key and the private key is stored on the server. When the user wants to make a payment, he sends his password. The password decrypts the private key, and the private key decrypts the CC details and the CC details are charged.

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• undefined method get with sinatra

  - by dorelal

  I have following code require 'rubygems' require 'sinatra' get '/' do 'Hello World!' end gem list sinatra *** LOCAL GEMS *** sinatra (1.0, 0.9.4) ruby -v ruby 1.8.7 (2009-06-12 patchlevel 174) [i686-darwin10.2.0] Error ruby myapp.rb ["==", "===", "=~", "__id__", "__send__", "class", "clone", "display", "dup", "enum_for", "eql?", "equal?", "extend", "freeze", "frozen?", "hash", "id", "include", "inspect", "instance_eval", "instance_exec", "instance_of?", "instance_variable_defined?", "instance_variable_get", "instance_variable_set", "instance_variables", "is_a?", "kind_of?", "method", "methods", "nil?", "object_id", "private", "private_methods", "protected_methods", "public", "public_methods", "respond_to?", "send", "singleton_methods", "taguri", "taguri=", "taint", "tainted?", "tap", "to_a", "to_enum", "to_s", "to_yaml", "to_yaml_properties", "to_yaml_style", "type", "untaint"] ./sinatra.rb:17: undefined method `get' for main:Object (NoMethodError) from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' from myapp.rb:3

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• McAfee Virus Scan and Oracle RAC

  - by Lee Gathercole

  Hi, We're experiencing a strange problem with Oracle RAC and McAfee anti-virus. As part of the installation of the Oracle RAC we disable anti virus as directed. We have had our RAC running fine, but when we came to re-enable the AV and reboot we got the BSOD. Abnormal Program Termination (BugCheck, STOP: 0x00000035 (0x8E984678, 0x00000000, 0x00000000, 0x00000000 NO_MORE_IRP_STACK_LOCATIONS Following the standard process of raising this problem with Microsoft they identify the problem and also a fix. Microsoft talk about too many file filter drivers being present and pushing the DFS upper limit beyond the default size. Upping this value, as per msdn, has no impact. We're able to recover from this BSOD by disabling AV. We don't have the problem if we run the AV service manually whilst the system is up. However, if we make the service automatic we fail to boot. Tech Details 2 Node Oracle 10g Cluster 2 * Windows 2003 SP2, 16GB RAM, Quad Core 3ghz Processor SAN attached storage McAfee VirusScan Enterprise 8.5.0i, Scan Engine (5300.2777), DAT Version (5536.0000) Thanks Lee

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• Possible to register Selenium RC's with the Hudson Selenium Grid Hub w/o the RC's being slaves in th

  - by Rodreegez

  I am trying to get Hudson to run my ruby based selenium tests. I have installed the Selenium Grid plugin, but I don't want to have the RC's running as slaves in a Hudson cluster. The reason for this is I don't want to waste the next six years of my life trying to configure each of my projects in various Windows environments. Hudson currently pulls each project from Github and builds it just fine. With a regular Selenium Grid setup, I am able to edit the grid_configuration.yml file to represent the various environments I wish to tests against, then pass environment variables to the rake task that runs the test i.e. which browser/platfom to run on and the URL of the application under test -- usually a port on the hub machine running in a specific environment. In this way, the machines on which the RC's run don't need to know anything about the source code of my apps, they just need to have selenium-grid installed and have registered with the hub. Is there a way of elegantly emulating this with Hudson?

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• Application Context in Rails

  - by Sean McMains

  Rails comes with a handy session hash into which we can cram stuff to our heart's content. I would, however, like something like ASP's application context, which instead of sharing data only within a single session, will share it with all sessions in the same application. I'm writing a simple dashboard app, and would like to pull data every 5 minutes, rather than every 5 minutes for each session. I could, of course, store the cache update times in a database, but so far haven't needed to set up a database for this app, and would love to avoid that dependency if possible. So, is there any way to get (or simulate) this sort of thing? If there's no way to do it without a database, is there any kind of "fake" database engine that comes with Rails, runs in memory, but doesn't bother persisting data between restarts?

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• plotting results of hierarchical clustering ontop of a matrix of data in python

  - by user248237

  How can I plot a dendrogram right on top of a matrix of values, reordered appropriately to reflect the clustering, in Python? An example is in the bottom of the following figure: http://www.coriell.org/images/microarray.gif I use scipy.cluster.dendrogram to make my dendrogram and perform hierarchical clustering on a matrix of data. How can I then plot the data as a matrix where the rows have been reordered to reflect a clustering induced by the cutting the dendrogram at a particular threshold, and have the dendrogram plotted alongside the matrix? I know how to plot the dendrogram in scipy, but not how to plot the intensity matrix of data with the right scale bar next to it. Any help on this would be greatly appreciated.

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• Why did my flash drive become "read only" and (how) can I fix it?

  - by Bob

  I have a brand new flash drive (one week old) that has become marked as read only, by Windows, Kubuntu and a bootable partitioner. Why did this happen? Is it fixable? If it is, how can I fix this? The problem Firstly, this drive is new. It's certainly not been used enough to die from normal wear and tear, though I would not discount defective components. The drive itself has somehow become locked in a read only state. Windows' Disk management: Diskpart: Generic Flash Disk USB Device Disk ID: 33FA33FA Type : USB Status : Online Path : 0 Target : 0 LUN ID : 0 Location Path : UNAVAILABLE Current Read-only State : Yes Read-only : No Boot Disk : No Pagefile Disk : No Hibernation File Disk : No Crashdump Disk : No Clustered Disk : No What really confuses me is Current Read-only State : Yes and Read-only : No. Attempted solutions So far, I've tried: Formatting it in Windows (in Disk management, the format options are greyed out when right clicking). DiskPart Clean (CLEAN - Clear the configuration information, or all information, off the disk.): DISKPART> clean DiskPart has encountered an error: The media is write protected. See the System Event Log for more information. There was nothing in the event log. Windows command line format >format G: Insert new disk for drive G: and press ENTER when ready... The type of the file system is FAT32. Verifying 7740M Cannot format. This volume is write protected. Windows chkdsk: see below for details Kubuntu fsck (through VirtualBox USB passthrough): see below for details Acronis True Image to format, to convert to GPT, to destroy and rebuild MBR, basically anything: failed (could not write to MBR) Details (and a nice story) Background This was a brand new, generic, 8GB flash drive I wanted to create a multiboot flash drive with. It came formatted as FAT32, though oddly a little larger than most 8 GIGAbyte flash drives I've come across. Approximately 127MB was listed as "used" by Windows. I never discovered why. The end usable space was about what I normally expect from a 8GB drive (approx 7.4 GIBIbytes). I had thrown quite a few Linux distros on, along with a copy of Hiren's. They would all boot perfectly. They were put on with YUMI. When I tried to put the Knoppix DVD on, YUMI added an odd video option to its boot comman which caused Knoppix to boot with a black screen on X. ttys 1 through 6 still worked as text only interfaces. A few days later, I took some time to take that odd video option off, making the boot command match the one that comes with Knoppix. On the attempt to boot, Knoppix reported some form of LZMA corruption. Leading up to the current issue I was thinking the Knoppix files may have been corrupted somehow, so I tried reloading it. The drive was nearly full (45MB free), so I deleted a generic ISO that also was not booting. That went fine. I then went through YUMI to 'uninstall' Knoppix, i.e. delete files and remove from the menus. The files went first, then the menus were cleared successfully. However, the free space was stuck at about 700MB, same as it was before removing Knoppix. In the old Knoppix folder, there was a 0 byte file named KNOPPIX that could not be deleted. I tried reinserting the drive to delete this file - without safely removing, if that made a difference (hey, first time for everything). Running the standard Windows chkdsk scan without /r or /f reported errors found. Running with /r just got it stuck. I decided to give fsck a shot, so I loaded up my Kubuntu VM and attached the drive to it with VirtualBox's USB 2.0 passthrough. I umounted it (/dev/sda1) and ran a fsck. There are differences between boot sector and its backup. I chose No action. It told me FATs differ and asked me to select either the first or second FAT. Whichever I selected, I got a notice of Free cluster summary wrong. If I chose Correct, it gave a list of incorrect file names. To try to fix something, at least, I ran it with the -p option. Halfway through fixing the files, the VM froze - I ended its process about ten minutes later. Cause? My next attempt was to use YUMI, again, to rebuild the whole drive. I used YUMI's built in reformat (to FAT32) option and installed a Kubuntu ISO (700MB). The format was successful, however, the extract and copy of Kubuntu (which YUMI uses a 7zip binary for) froze at about 60% done. After waiting for about fifteen minutes (longer than the 3.5GB Knoppix ISO took last time), I pulled the drive out. The drive at this point was already formatted, SYSLINUX already installed, just waiting on the unpacking of an ISO and the modifying of the boot menus. Plugging it back in, it came up as normal - however, any write action would fail. Disk management reported it as read only. On reconnect, it would come up as normal but a write operation would cause it to go read only again. After a few attempts, it started coming up as read only on insertion. Attempts to fix This is when I ran through the attempts listed above, to try and reformat it in case of a faulty format. However the inability to do so even on a bootable disk indicated something more serious is wrong. chkdsk now reports nothing is wrong, and fsck still reports MBR inconsistencies, but now always chooses first FAT automatically after telling me FATs differ. It still does the same Free cluster summary wrong afterwards. I cannot run with -p anymore because it is now marked as read only. It also managed to corrupt my VM's disk somehow on the first attempt (yes, I'm sure I chose sda, which is mapped to a 7.4GB drive - I triple checked). Thank god for snapshots? I'm just about out of ideas. To my inexperienced mind it looks like something in the drive's firmware set it to read only "permanently" somehow - is there any way to reset this? I don't particularly care about keeping data, considering I've reformatted it twice. Also, fixes that keep me in Windows are better; it reduces the risk of me accidentally nuking my main hard drive. Update 1: I pulled apart the drive out of curiosity. As you can see, there are no obvious write protect switches. There is an IC on the other side, ALCOR branded labelled AU6989HL, if that matters. If there appears to be no way to fix this, I'll probably pull out the (glued down) card and put it in a card reader to check if it's the card or the controller that died. Update 2: I've pulled the card off, Windows detects the drive as a card reader now. The contacts on the card don't appear to be used, and there are several rows of holes on the card itself. Putting it into the card reader only detects about 30MB total, RAW. It's probably either the reader incorrectly reporting the card as faulty (as if a real SD card's write protect was switched on) or a bad contact somewhere. If nothing else, I have a spare 8GB Micro SD card now... as soon as I figure out how to format it as 8GB.

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• Custom Icon for Marker Clusterer

  - by Nyxynyx

  I am using Marker Clusterer library for Google Maps API V3. Now that I have the clusterer working, I want to change the default icon to a custom one. Prorblem: When I try to set the style property of the marker clusterer, the default icon still appears. Where did I go wrong? JS Code // Marker Clusterer var styles = {styles: [{ height: 53, url: "http://localhost/mywebsite/images/template/markers/cluster.png", width: 53 }, { height: 56, url: "http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/images/m2.png", width: 56 }, { height: 66, url: "http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/images/m3.png", width: 66 }, { height: 78, url: "http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/images/m4.png", width: 78 }, { height: 90, url: "http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/images/m5.png", width: 90 }]}; var mcOptions = {gridSize: 50, maxZoom: 15, styles: styles[styles]}; mc = new MarkerClusterer(map, [], mcOptions);

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• dictionary of lists of dictionaries in python

  - by Andy

  I'm a perl scripter working in python and need to know a way to do the following perl in python. $Hash{$key1}[$index_value]{$key2} = $value; I have seen the stackoverflow question here: List of dictionaries, in a dictionary - in Python I still don't understand what self.rules is doing or if it works for my solution. My data will be coming from files, and will I will be using regexes to capture to temporary variables until ready to store in the data structure. If you need to ask, the order related to the $index_value is important and would like to be maintained as an integer. Any suggestions are appreciated or if you think I need to rethink data structures with Python that would be helpful.

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• Understanding memory and cpu speed

  - by tipu

  Firstly, I am working on a windows xp 64 machine with 4gb ram and 2.29 ghz x4 I am indexing 220,000 lines of text that are more or less the same length. These are divided into 15 equally sized files. File 1/15 takes 1 minute to index. As the script indexes more files, it seems to take much longer with file 15/15 taking 40 minutes. My understanding is that the more I put in memory, the faster the script is. The dictionary is indexed in a hash, so fetch operations should be O(1). I am not sure where the script would be hanging the CPU. I have the script here.

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• Are keys and values of %INC platform-dependent or not?

  - by codeholic

  I'd like to get the full filename of an included module. Consider this code: package MyTest; my $path = join '/', split /::/, __PACKAGE__; $path .= ".pm"; print "$INC{$path}\n"; 1; $ perl -Ipath/to/module -MMyTest -e0 path/to/module/MyTest.pm Will it work on all platforms? perlvar The hash %INC contains entries for each filename included via the do, require, or useoperators. The key is the filename you specified (with module names converted to pathnames), and the value is the location of the file found. Are these keys platform-dependent or not? Should I use File::Spec or what? At least ActivePerl on win32 uses / instead of \. Update: What about %INC values? Are they platform-dependent?

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• Chrome history problem

  - by Parhs

  $("#table_exams tbody tr").click(function (event) { window.location.href="#" +$(this).attr("exam_ID"); window.location.href="/medilab/prototypes/exams/edit?examId=" + $(this).attr("exam_ID") +"&referer=" + referer; row_select(this); }); $(document).keypress(function (event) { if(event.keyCode==13) $(row_selected).trigger("click"); }); I have a little problem with this only in chrome...When user goes back chrome ignores the last href hash that my script added..but when i do a doubleclick its ok... IE and Firefox work great...

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• What does the "ApplicaionDirectory" Membership condition mean in .NET Code Access Security?

  - by smwikipedia

  I am not sure about the semantic of "ApplicationDirectory" membership condition. I am trying to use it in the .NET Framework 2.0 configuration tool. The tool's explanation to it is as below: The Application Directory membership condition is true for all assemblies in the same directory or in a child directory of the running application. Assemblies that meet this membership condition will be granted the permissions associated with this code group. All the other membership conditions such as strong name, hash, need me to input some criterias, only the Application Directory has not. How to use it? Could someone give an explanation by example? Many thanks.

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• activemq round robin between queues or topics

  - by forkit

  I'm trying to achieve load balancing between different types of messages. I would not know in advance what the messages coming in might be until they hit the queue. I know I can try resequencing the messages, but I was thinking that maybe if there was a way to have the various consumers round robin between either queues or between topics, this would solve my problem. The main problem i'm trying to solve is that I have many services sending messages to one queue with many consumers feeding off one queue. I do not want one type of service monopolizing the entire worker cluster. Again I don't know in advance what the messages that are going to hit the queue are going to be. To try to clearly repeat my question: Is there a way to tell the consumers to round robin between either existing queues or topics? Thank you in advance.

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• Copy Structure To Another Program

  - by Steven

  Long story, long: I am adding a web interface (ASPX.NET: VB) to a data acquisition system developed with LabVIEW which outputs raw data files. These raw data files are the binary representation of a LabVIEW cluster (essentially a structure). LabVIEW provides functions to instantiate a class or structure or call a method defined in a .NET DLL file. I plan to create a DLL file containing a structure definition and a class with methods to transfer the structure. When the webpage requests data, it would call a LabVIEW executable with a filename parameter. The LabVIEW code would instantiate the structure, populate the structure from the data file, then call the method to transfer the data back to the website. Long story, short: How do you recommend I transfer (copy) an instance of a structure from one .NET program to a VB.NET program? Ideas considered: sockets, temp file, xml file, config file, web services, CSV, some type of serialization, shared memory

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• smarter character replacement using ruby gsub and regexp

  - by agriciuc

  Hi guys! I'm trying to create permalink like behavior for some article titles and i don't want to add a new db field for permalink. So i decided to write a helper that will convert my article title from: "O "focoasa" a pornit cruciada, împotriva barbatilor zgârciti" to "o-focoasa-a-pornit-cruciada-impotriva-barbatilor-zgarciti". While i figured out how to replace spaces with hyphens and remove other special characters (other than -) using: title.gsub(/\s/, "-").gsub(/[^\w-]/, '').downcase I am wondering if there is any other way to replace a character with a specific other character from only one .gsub method call, so I won't have to chain title.gsub("a", "a") methods for all the UTF-8 special characters of my localization. I was thinking of building a hash with all the special characters and their counterparts but I haven't figured out yet how to use variables with regexps. What I was looking for is something like: title.gsub(/\s/, "-").gsub(*replace character goes here*).gsub(/[^\w-]/, '').downcase Thanks!

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• Apache Cassandra overwhelming bandwidth overhead

  - by tanyehzheng

  while testing Apache Cassandra, I inserted 1000 rows of data. I allow it to propagate to the other machine on LAN. This is a 2 machine cluster. I monitor the network connection between the two machine. The total data I expected to flow between the two servers should be around 25Mb including all column names, column values and timestamps). But the actual data sent and received between them was an whopping 362Mb!! Anybody knows why is there such an overwhelming overhead? Thank you

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• Weblogic server 10.0 - Managed Server shutting down

  - by Eqbal

  We have a weblogic server 10.0 instance which has a cluster with one managed server. Every Monday at 5am (or few seconds after), it shuts down on its own. The logs do not show any errors except the following message: JVM called WLS shutdown hook. The server will force shutdown now. JVM has a -Xnohup option and using JRockit. There is no cron job on the server. I am not sure how to debug this one. Admin Server keeps running with no issues and I am able to start the managed server back up with no problems. Any help is greatly appreciated. Thanks.

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• optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?

  - by brahn

  I've been a bad kid and used the following syntax in my partial templates to set default values for local variables if a value wasn't explicitly defined in the :locals hash when rendering the partial -- <% foo = default_value unless (defined? foo) %> This seemed to work fine until recently, when (for no reason I could discern) non-passed variables started behaving as if they had been defined to nil (rather than undefined). As has been pointed by various helpful people on SO, http://api.rubyonrails.org/classes/ActionView/Base.html says not to use defined? foo and instead to use local_assigns.has_key? :foo I'm trying to amend my ways, but that means changing a lot of templates. Can/should I just charge ahead and make this change in all the templates? Is there any trickiness I need to watch for? How diligently do I need to test each one?

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• ZooKeeper and RabbitMQ/Qpid together - overkill or a good combination?

  - by Chris Sears

  Greetings, I'm evaluating some components for a multi-data center distributed system. We're going to be using message queues (via either RabbitMQ or Qpid) so agents can make asynchronous requests to other agents without worrying about addressing, routing, load balancing or retransmission. In many cases, the agents will be interacting with components that were not designed for highly concurrent access, so locking and cross-agent coordination will be needed to avoid race conditions. Also, we'd like the system to automatically respond to agent or data center failures. With the above use cases in mind, ZooKeeper seemed like it might be a good fit. But I'm wondering if trying to use both ZK and message queuing is overkill. It seems like what Zookeeper does could be accomplished by my own cluster manager using AMQP messaging, but that would be hard to get really right. On the other hand, I've seen some examples where ZooKeeper was used to implement message queuing, but I think RabbitMQ/Qpid are a more natural fit for that. Has anyone out there used a combination like this? Thanks in advance, -Chris

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• How can I make Rails 3 router to localize url's using localization files?

  - by edgerunner

  What I'd like to be able to do is: in config/routes.rb resources :posts in config/locale/en.yml en: resources: posts: "posts" new: "new" edit: "edit" in config/locale/tr.yml tr: resources: posts: "yazilar" new: "yeni" edit: "duzenle" and get I18n.locale = :en edit_post_path(3) #=> /posts/3/edit I18n.locale = :tr edit_post_path(3) #=> /yazilar/3/duzenle I'd also like rails to match any of these routes anytime and pass the associated locale in the params hash such that when I navigate to /yazilar , the request should be routed to the posts#index action. Any simple way of doing that?

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• Good way to find duplicate files?

  - by OverTheRainbow

  Hello I don't know enough about VB.Net (2008, Express Edition) yet, so I wanted to ask if there were a better way to find files with different names but the same contents, ie. duplicates. In the following code, I use GetFiles() to retrieve all the files in a given directory, and for each file, use MD5 to hash its contents, check if this value already lives in a dictionary: If yes, it's a duplicate and I'll delete it; If not, I add this filename/hashvalue into the dictionary for later: 'Get all files from directory Dim currfile As String For Each currfile In Directory.GetFiles("C:\MyFiles\", "File.*") 'Check if hashing already found as value, ie. duplicate If StoreItem.ContainsValue(ReadFileMD5(currfile)) Then 'Delete duplicate 'This hashing not yet found in dictionary -> add it Else StoreItem.Add(currfile, ReadFileMD5(currfile)) End If Next Is this a good way to solve the issue of finding duplicates, or is there a better way I should know about? Thank you.

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