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  • Is generic Money<T_amount> a good idea?

    - by jdk
    I have a Money Type that allows math operations and is sensitive to exchange rates so it will reduce one currency to another if rate is available to calculate in a given currency, rounds by various methods. It has other features that are sensitive to money, but I need to ask if the basic data type used should be made generic in nature. I've realized that the basic data type to hold an amount may differ for financial situations, for example: retail money might be expressed as all cents using int or long where fractions of cents do not matter, decimal is commonly used for its fixed behaviour, sometimes double seems to be used for big finance and large values sometimes a special BigInteger or 3rd-party type is used. I want to know if it would be considered good form to turn Money into Money<T_amount> so it can be used in any one of the above chosen scenarios?

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  • Using python to play two sine tones at once

    - by Alex
    I'm using python to play a sine tone. The tone is based off the computer's internal time in minutes, but I'd like to simultaneously play one based off the second for a harmonized or dualing sound. This is what I have so far; can someone point me in the right direction? from struct import pack from math import sin, pi import time def au_file(name, freq, dur, vol): fout = open(name, 'wb') # header needs size, encoding=2, sampling_rate=8000, channel=1 fout.write('.snd' + pack('>5L', 24, 8*dur, 2, 8000, 1)) factor = 2 * pi * freq/8000 # write data for seg in range(8 * dur): # sine wave calculations sin_seg = sin(seg * factor) fout.write(pack('b', vol * 127 * sin_seg)) fout.close() t = time.strftime("%S", time.localtime()) ti = time.strftime("%M", time.localtime()) tis = float(t) tis = tis * 100 tim = float(ti) tim = tim * 100 if __name__ == '__main__': au_file(name='timeSound1.au', freq = tim, dur=1000, vol=1.0) import os os.startfile('timeSound1.au')

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  • HTTP request, strange socket behavoir

    - by hoodoos
    I expirience strange behavior when doing HTTP requests through sockets, here the request: POST https://test.com:443/service/XMLSelect HTTP/1.1 Content-Length: 10926 Host: test.com User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 1.0.3705) Authorization: Basic XXX SOAPAction: http://test.com/SubmitXml Later on there goes body of my request with given content length. After that I recive something like: HTTP/1.1 200 OK Server: Apache-Coyote/1.1 Content-Type: text/xml;charset=utf-8 Transfer-Encoding: chunked Date: Tue, 30 Mar 2010 06:13:52 GMT So everything seem to be fine here. I read all contents from network stream and successfuly recieve response. But my socket which I'm doing polling on switches it's modes like that: write ( i write headers and request here ) read ( after headers sent i begin to recieve response ) write ( STRANGE BEHAVIOUR HERE. WHY? here i send nothing really ) read ( here it switches to read back again ) last two steps can repeat several times. So I want to ask what leads for socket's mode change? And in this case it's not a big problem, but when I use gzip compression in my request ( no idea how it's related ) and ask server to send gzipped response to me like this: POST https://test.com:443/service/XMLSelect HTTP/1.1 Content-Length: 1076 Accept-Encoding: gzip Content-Encoding: gzip Host: test.com User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 1.0.3705) Authorization: Basic XXX SOAPAction: http://test.com/SubmitXml I recieve response like that: HTTP/1.1 200 OK Server: Apache-Coyote/1.1 Content-Encoding: gzip Content-Type: text/xml;charset=utf-8 Transfer-Encoding: chunked Date: Tue, 30 Mar 2010 07:26:33 GMT 2000 ? I recieve a chunk size and GZIP header, it's all okay. And here's what is happening with my poor little socket meanwhile: write ( i write headers and request here ) read ( after headers sent i begin to recieve response ) write ( STRANGE BEHAVIOUR HERE. And it finally sits here forever waiting for me to send something! But if i refer to HTTP I don't have to send anything more! ) What can it be related to? What it wants me to send? Is it remote web server's problem or do I miss something? PS All actual service references and login/passwords replaced with fake ones :)

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  • Simple CGI server

    - by Egor Makarov
    How can I run my perl CGI script without apache? This is for testing purposes, so some kind of single-process server that processes only one request at time should be enough for me.

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  • How does .NET determine the week in a TimeZoneInfo.TransitionTime ?

    - by Travis Brooks
    Greetings I'm trying to do some DateTime math for various time zones and I wanted to take daylight savings into account. Lets say I have a TimeZoneInfo and i've determined the appropriate AdjustmentRule for a given DateTime. Lets also say the particular TimeZoneInfo i'm dealing with is specified as rule.DaylightTransitionStart.IsFixedDateRule == false, so I need to figure out if the given DateTime falls within the start/end TransitionTime.Week values. This is where I'm getting confused, what is .NET considering as a "week"? My first thought was it probably used something like DayOfWeek thisMarksWeekBoundaries = Thread.CurrentThread.CurrentUICulture.DateTimeFormat.FirstDayOfWeek; and went through the calendar assigning days to week, incrementing week every time it crossed a boundary. But, if I do this for May 2010 there are 6 week boundary buckets, and the max valid value for TransitionTime.Week is 5 so this can't be right. Whats the right way to slice up May 2010?

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  • How do you unit test JEE code?

    - by marabol
    I want to ask for your prefered way to test JEE code? I found only three project, that are trying to help to code unit tests in JEE environment: http://jakarta.apache.org/cactus/ : Last Published: 2009-01-18 http://www.junitee.org/ : Last Release: 2004-12-11 http://ejb3unit.sourceforge.net/ : Last Release: 2008-05-17 So I wonder, is there any framework helping to write (j) unit test for JEE code? do you use embedded JEE servers like jboss or glassfish v3? do you mockup and inject by yourself? Thanks a lot...

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  • why jsessionid is appended to each url?

    - by sword101
    greetings all i am deploying an app using spring framework on the apache tomcat when running the application from the tomcat directly,there's no jsessionid appended to any url at all but after mapping the application to the domain,and trying to run it i got a jsessionid appended to each url in the application,i tried the spring security attribute disable-url-rewriting but it doesn't work,it removes the jsessionid from the url but the application doesn't work no more,the user cannot login. so i guess it's another problem,any ideas why this happens,how to solve it? thanks.

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  • Beans, Lists and JSP

    - by Luigi 1982
    Hi at All I have a little question... On my JSP page I have a List of beans. I want to extract a sublist of beans with a specific property (Ex. all Horror books). Can Apache Beanutils help me? Thanks in advance...

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  • Compiler optimization of repeated accessor calls

    - by apocalypse9
    I've found recently that for some types of financial calculations that the following pattern is much easier to follow and test especially in situations where we may need to get numbers from various stages of the computation. public class nonsensical_calculator { ... double _rate; int _term; int _days; double monthlyRate { get { return _rate / 12; }} public double days { get { return (1 - i); }} double ar { get { return (1+ days) /(monthlyRate * days) double bleh { get { return Math.Pow(ar - days, _term) public double raar { get { return bleh * ar/2 * ar / days; }} .... } Obviously this often results in multiple calls to the same accessor within a given formula. I was curious as to whether or not the compiler is smart enough to optimize away these repeated calls with no intervening change in state, or whether this style is causing a decent performance hit. Further reading suggestions are always appreciated

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  • Jetty 7 NIO issue?

    - by Continuation
    I saw this test showing Jetty 7's performance drops drastically when switched from blocking IO to NIO (95% drop): http://wiki.apache.org/HttpComponents/HttpCoreBenchmark Is this a known issue? Have you experienced it first hand? Should I be avoiding NIO on Jetty?

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  • Maven nexus with jetty 7 and apache2 reverse proxy

    - by user613154
    Hello stackoverflow ! Here is my problem : i try to run a maven nexus behind an apache reverse proxy. As i have multiples war in my jetty, i want the nexus to run here : http://localhost:8080/nexus I made a jetty context file as follow : {jetty.home}/contexts/nexus.xml <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd"> <Configure class="org.eclipse.jetty.webapp.WebAppContext"> <Set name="contextPath">/nexus</Set> <Set name="war"><SystemProperty name="jetty.home" default="."/>/webapps/nexus.war</Set> </Configure> My jetty connector in jetty.xml is as follow : <Call name="addConnector"> <Arg> <New class="org.eclipse.jetty.server.nio.SelectChannelConnector"> <Set name="host"><Property name="jetty.host" /></Set> <Set name="port"><Property name="jetty.port" default="8080"/></Set> <Set name="maxIdleTime">300000</Set> <Set name="Acceptors">2</Set> <Set name="forwarded">true</Set> <Set name="statsOn">false</Set> <Set name="confidentialPort">8443</Set> <Set name="lowResourcesConnections">20000</Set> <Set name="lowResourcesMaxIdleTime">5000</Set> </New> </Arg> </Call> I want http://maven.foo.com/ as an end point for the nexus, so i made this apache2 configuration file : ProxyRequests Off ProxyVia Off ProxyPreserveHost On <Proxy *> AddDefaultCharset off Order deny,allow Allow from all </Proxy> <VirtualHost *:80> ServerName maven.foo.com ProxyPass / http://localhost:8080/nexus/ ProxyPassReverse / http://localhost:8080/nexus/ ErrorLog ${APACHE_LOG_DIR}/error_nexus.log </VirtualHost> But i can't manage to make it work. The error message displayed in the browser is "The server has not found anything matching the request URI". I tried to read docs on jetty and apache web site, but didn't find information for mapping a subdomain "sub.foo.com" to a context "localhost:8080/sub" ... Any help welcome ! Thanks

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  • Axis2 aar file structure question

    - by Alan Mangroo
    I trying to create an Axis2 arr file that has 2 package heirachies. However my service class is throwing a class not found exception when it tries to use classes in the utils package. Is it possible to do this in Axis? Any advice is very welcome. Below is an example of the structure I am trying to create (utils and org are both top level packages)... |- SampleService |-- META-INF |--- services.xml |-- utils |---MyUtils.class |-- org |---- apache |---- axis2 |----- axis2userguide |------ SampleService.class

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  • Using python to play two sin tones at once

    - by Alex
    Im using python to a sine tone. the tone is based off the computers internal time in minutes, but id like to simultaneously play one based off the second for a harmonized or dualing sound. This is what I have so far can someone point me in the right direction. from struct import pack from math import sin, pi import time def au_file(name, freq, dur, vol): fout = open(name, 'wb') # header needs size, encoding=2, sampling_rate=8000, channel=1 fout.write('.snd' + pack('>5L', 24, 8*dur, 2, 8000, 1)) factor = 2 * pi * freq/8000 # write data for seg in range(8 * dur): # sine wave calculations sin_seg = sin(seg * factor) fout.write(pack('b', vol * 127 * sin_seg)) fout.close() t = time.strftime("%S", time.localtime()) ti = time.strftime("%M", time.localtime()) tis = float(t) tis = tis * 100 tim = float(ti) tim = tim * 100 if name == 'main': au_file(name='timeSound1.au', freq = tim, dur=1000, vol=1.0) import os os.startfile('timeSound1.au')

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  • Caching web API proxy?

    - by Jeremy Dunck
    I was wondering if anyone knows of a caching proxy specifically for dealing with API responses? Ideally, I'd be able to declare what caching policy to use for different API semantics, e.g. cache album art for 1 day, cache favorite tweets for 5 minutes, cache map tiles forever, except invalidate when this other API is called. I know about using Apache, Squid, etc for caching in general -- I'm just hoping for something with nicer usage semantics by restricting the design goal to dealing with APIs rather than the web in general.

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  • WPF layout with several fixed height parts and certain parts relative to window size

    - by Daniil Harik
    Hello, At moment my main layout consists of vertically oriented stack panel and it looks like this: Root StackPanel StackPanel - fixed Height 150 (horizontal orientation) StackPanel - relative Height must be behalf of free space left on screen (but at least 150 px). Used by Telerik GridView Control, if I don't specify Height or MaxHeight Telerik GridView Height becomes very large and does not fit my window. StackPanel - fixed Height 100 (horizontal orientation) StackPanel - relative Height must be half of free space left on screen (but at least 150 px). Used by Telerik GridView Control, if I don't specify Height or MaxHeight Telerik GridView Height becomes very large and does not fit my window. StackPanel - fixed Height 100 (horizontal orientation) The view must totally fit available screen size. The problem is that I don't understand how to make certain areas of my view resize depending on available screen size. Is there is easy way to solve it, or should I be binding to Window height property and doing math? Thank You very much!

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  • How to spot empty parking spaces?

    - by mithila
    I want to do a final year B.Sc project on parking space detection. Can anybody give me some link related to it? Any text-book, tutorial or anything? What would be prerequisite for this project? What type of skills(programming/math) are needed? What are the initial steps to do? What type of readings(algorithms of image processing) are needed? Detail added in comments: i'm going to use camera, not infrared. i would like to use still images, or one camera which captures images from a parking lot. i think reak-time processing will be tough, at this moment i just need to start the project. so still images will work fine. but later it may b a real-time project

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  • How would you go about tackling this problem?

    - by incrediman
    I have a programming contest coming up in about half a week, and I've been prepping :) I found a bunch of questions from this canadian competition, they're great practice: http://cemc.math.uwaterloo.ca/contests/computing/2009/stage2/day1.pdf I'm looking at problem B ("Dinner"). Any idea where to start? I can't really think of anything besides the naive approach (ie. trying all permutations) which would take too long to be a valid answer. Btw, the language there says c++ and pascal I think, but i don't care what language you use - I mean really all I want is a brief description of how to tackle the problem. Like "use X technique treating each programmer as a Y" or something :)

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  • Tools to help process Akamai data logs?

    - by dsldsl
    I'm digging through Akamai logs, downloading excel sheets, and then manually joining them so that I can do sorting of data to find top videos and referrers. Are there any tools you know of to help with this kind of processing? I'm looking for something like Urchin used to be for Apache logs, but for Akamai logs. Thanks!

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  • Bash completion for Maven escapes colon

    - by armandino
    I added bash completion for Maven following the docs: http://maven.apache.org/guides/mini/guide-bash-m2-completion.html Everything works well except for goals that use a colon. For instance, instead of mvn eclipse:eclipse completion escapes the colon mvn eclipse\:eclipse Any suggestions how this can be fixed? I'm using Ubuntu 8.10 (2.6.27-17-generic) and $ bash -version GNU bash, version 3.2.39(1)-release (i486-pc-linux-gnu)

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  • Is it worth purchasing Mahout in Action to get up to speed with Mahout, or are there other better sources?

    - by gab
    I'm currently a very casual user of Apache Mahout, and I'm considering purchasing the book Mahout in Action. Unfortunately, I'm having a really hard time getting an idea of how worth it this book is -- and seeing as it's a Manning Early Access Program book (and therefore only currently available as a beta-version e-book), I can't take a look myself in a bookstore. Can anyone recommend this as a good (or less good) guide to getting up to speed with Mahout, and/or other sources that can supplement the Mahout website?

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  • Throw of a die in Java

    - by Arkapravo
    The throw of a die is a popular program in Java, public class Die { /* This program simulates rolling a die */ public static void main(String[] args) { int die; // The number on the die. die = (int)(Math.random()*6 + 1); System.out.println (die); } // end main() } // end class What I wish to do is make it repeat, 500 times. I have not been able to put this program into a loop of 500. I usually program in Python, thus I guess my Java has rusted ! Any help is most welcome !

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  • how to send file via http with python

    - by ep45
    Hello, I have a problem. I use Apache with mod_wsgi and webpy, and when i send a file on http, a lot packets are lost. This is my code : web.header('Content-Type','video/x-flv') web.header('Content-length',sizeFile) f = file(FILE_PATH, 'rb') while True: buffer = f.read(4*1024) if buffer : yield buffer else : break f.close() What in my code is wrong ? thanks.

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