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  • Java - Class type from inside static initialization block

    - by DutrowLLC
    Is it possible to get the class type from inside the static initialization block? This is a simplified version of what I currently have:: class Person extends SuperClass { String firstName; static{ // This function is on the "SuperClass": // I'd for this function to be able to get "Person.class" without me // having to explicitly type it in but "this.class" does not work in // a static context. doSomeReflectionStuff(Person.class); // IN "SuperClass" } } This is closer to what I am doing, which is to initialize a data structure that holds information about the object and its annotations, etc... Perhaps I am using the wrong pattern? public abstract SuperClass{ static void doSomeReflectionStuff( Class<?> classType, List<FieldData> fieldDataList ){ Field[] fields = classType.getDeclaredFields(); for( Field field : fields ){ // Initialize fieldDataList } } } public abstract class Person { @SomeAnnotation String firstName; // Holds information on each of the fields, I used a Map<String, FieldData> // in my actual implementation to map strings to the field information, but that // seemed a little wordy for this example static List<FieldData> fieldDataList = new List<FieldData>(); static{ // Again, it seems dangerous to have to type in the "Person.class" // (or Address.class, PhoneNumber.class, etc...) every time. // Ideally, I'd liken to eliminate all this code from the Sub class // since now I have to copy and paste it into each Sub class. doSomeReflectionStuff(Person.class, fieldDataList); } }

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  • How can I make outbound requests from two servers that appear to come from the same IP address

    - by Brad
    I am making calls from an ec2 instance to a third party web service (over which I have no control). I would like to be able to scale horizontally, so that I can make these calls from multiple ec2 instances, but the web service I'm calling whitelists my IP, and for the sake of discussion let's assume I can't get another IP address whitelisted. How can I send requests from 2+ machines that appear to the web service to be from the same IP address? Thanks!

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  • Finding out if an IP address is static or dynamic?

    - by Joshua
    I run a large bulletin board and I get spammers every now and again. My moderation team does a good job filtering them out but every time I IP ban them they seem to come back (I'm pretty sure it's the same person on some occasions, as the post patterns are exactly the same as are the usernames) but I'm afraid to ban them by IP address every time. If they are on a dynamic IP address, I could be banning innocent users later down the line when they try to get to my forum through SERPs, but if I ban only via static IPs I know that I'm only banning that one person. So, is there a way to properly determine if an IP address is static or dynamic? Thanks.

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  • Logging IP address for uniqueness without storing the IP address itself for privacy

    - by szabgab
    In a web application when logging some data I'd like to make sure I can identify data that came at differetn times but from the same IP address. On the other hand for privacy concerns as the data will be released publicly I'd like to make sure the actual IP cannot be retrieved. So I need some one way mapping of the IP addresses to some other strings that ensures 1-1 mapping. If I understand correctly then MD5, SHA1 or SHA256 could be a solution. I wonder if they are not too expensive in terms of processing needed? I'd be interested in any solution though if there is implementation in Perl that would be even better.

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  • Know a good IP address Geolocation Service?

    - by carrier
    I'd like to get your impressions on any ip geolocation (as in IP to location) service services you may have employed? I'm looking for something free or cheap, which shouldn't be unrealistic because I need to make a very small volume of requests. Anything with python bindings would be especially ideal.

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  • How to create static method that evaluates local static variable once?

    - by Viet
    I have a class with static method which has a local static variable. I want that variable to be computed/evaluated once (the 1st time I call the function) and for any subsequent invocation, it is not evaluated anymore. How to do that? Here's my class: template< typename T1 = int, unsigned N1 = 1, typename T2 = int, unsigned N2 = 0, typename T3 = int, unsigned N3 = 0, typename T4 = int, unsigned N4 = 0, typename T5 = int, unsigned N5 = 0, typename T6 = int, unsigned N6 = 0, typename T7 = int, unsigned N7 = 0, typename T8 = int, unsigned N8 = 0, typename T9 = int, unsigned N9 = 0, typename T10 = int, unsigned N10 = 0, typename T11 = int, unsigned N11 = 0, typename T12 = int, unsigned N12 = 0, typename T13 = int, unsigned N13 = 0, typename T14 = int, unsigned N14 = 0, typename T15 = int, unsigned N15 = 0, typename T16 = int, unsigned N16 = 0> struct GroupAlloc { static const uint32_t sizeClass; static uint32_t getSize() { static uint32_t totalSize = 0; totalSize += sizeof(T1)*N1; totalSize += sizeof(T2)*N2; totalSize += sizeof(T3)*N3; totalSize += sizeof(T4)*N4; totalSize += sizeof(T5)*N5; totalSize += sizeof(T6)*N6; totalSize += sizeof(T7)*N7; totalSize += sizeof(T8)*N8; totalSize += sizeof(T9)*N9; totalSize += sizeof(T10)*N10; totalSize += sizeof(T11)*N11; totalSize += sizeof(T12)*N12; totalSize += sizeof(T13)*N13; totalSize += sizeof(T14)*N14; totalSize += sizeof(T15)*N15; totalSize += sizeof(T16)*N16; totalSize = 8*((totalSize + 7)/8); return totalSize; } };

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  • Location detecting tecniques for IP addresses

    - by ilhan
    What are the location detecting tecniques for IP adresses? I know to look at the $_SERVER['HTTP_ACCEPT_LANGUAGE'] (not accurate but mostly useful to detect location, for example if an IP range's users set French to their browser then it means that this range) belongs to France and gethostbyaddr($_SERVER['REMOTE_ADDR']) (to look country code top-level domain) then may be to whois gethostbyaddr($_SERVER['REMOTE_ADDR']) sometimes: $HTTP_USER_AGENT (Firefox's user agent string has language code, not accurate but mostly can be used to detect the location) But what about cities?

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  • How to bind an ip address to telnetlib in Python

    - by jack
    The code below binds an ip address to urllib, urllib2, etc. import socket true_socket = socket.socket def bound_socket(*a, **k): sock = true_socket(*a, **k) sock.bind((sourceIP, 0)) return sock socket.socket = bound_socket Is it also able to bind an ip address to telnetlib?

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  • Static Variables in Overloaded Functions

    - by BSchlinker
    I have a function which does the following: When the function is called and passed a true bool value, it sets a static bool value to true When the function is called and passed a string, if the static bool value is set to true, it will do something with that string Here is my concern -- will a static variable remain the same between two overloaded functions? If not, I can simply create a separate function designed to keep track of the bool value, but I try to keep things simple.

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  • non static method cannot be referenced from a static context.

    - by David
    First some code: import java.util.*; ... class TicTacToe { ... public static void main (String[]arg) { Random Random = new Random() ; toerunner () ; // this leads to a path of methods that eventualy gets us to the rest of the code } ... public void CompTurn (int type, boolean debug) { ... boolean done = true ; int a = 0 ; while (!done) { a = Random.nextInt(10) ; if (debug) { int i = 0 ; while (i<20) { System.out.print (a+", ") ; i++; }} if (possibles[a]==1) done = true ; } this.board[a] = 2 ; } ... } //to close the class Here is the error message: TicTacToe.java:85: non-static method nextInt(int) cannot be referenced from a static context a = Random.nextInt(10) ; ^ What exactly went wrong? What does that error message "non static method cannot be referenced from a static context" mean?

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  • Inherit static properties in subclass without redeclaration?

    - by David
    Hi, I'm having the same problem as this guy with the application I'm writing right now. The problem is that static properties are not being inherited in subclasses, and so if I use the static:: keyword in my main class, it sets the variable in my main class as well. It works if I redeclare the static variables in my subclass, but I expect to have a large number of static properties and subclasses and wish to avoid code duplication. The top-rated response on the page I linked has a link to a few "workarounds", but it seems to have 404'd. Can anyone lend me some help or perhaps point me in the direction of said workarounds?

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  • asp.net c# ip address lost after postback?

    - by Mark
    Hi all, One of my functions in a class is called GetIpAddress() which returns the following string: System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"] This all works well in regular page loads and gets my ip address, but when i for example let a user place a comment, then the ip address is lost after postback and i get an empty string returned. Am I missing something here maybe? Kind regards, Mark

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  • What is a "Public DNS registered IP address"?

    - by Emma
    I've been reading this ICANN agreement on new TLDs and it has this section on DNS service availability, which i don't completely understand: Refers to the ability of the group of listed-as-authoritative name servers of a particular domain name (e.g., a TLD), to answer DNS queries from DNS probes. For the service to be considered available at a particular moment, at least, two of the delegated name servers registered in the DNS must have successful results from “DNS tests” to each of their public-DNS registered “IP addresses” to which the name server resolves. If 51% or more of the DNS testing probes see the service as unavailable during a given time, the DNS service will be considered unavailable. I'm not 100% sure of the part in bold: does "public" refer to the DNS or to the IP addesses? It looks like there's a mistake and that the hyphen should have been after "DNS". So basically does it mean "the public IP addresses registered in the DNS"?

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  • Adding IP address to OpenVZ VPS (OpenVZ Web Panel)

    - by andy
    I apologise if I sound at all dumb. This is my first dedicated server having used a VPS for over a year and I'm trying to setup a VPS on this new server. I purchased a subnet from my hosting provider that I believe allows me 6 usable IP addresses: 177.xx.xxx.201 - 177.xx.xxx.206 The subnet address looks like this: 177.xx.xxx.200/29. I've gone on my server and added them like it said on a wiki like so: ip addr add 177.**.***.201/29 dev eth0 I done that for all six and now when I go to them in the browser they point to my server. The problem is, I'm using OpenVZ web panel to create VMs (http://code.google.com/p/ovz-web-panel/) so I created a VM and assigned one of those IPs to it. However when SSHing to that IP it SSH's to the dedicated server and not the VM. Am I missing something?

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  • Why and when should I make a class 'static'? What is the purpose of 'static' keyword on classes?

    - by Saeed Neamati
    The static keyword on a member in many languages mean that you shouldn't create an instance of that class to be able to have access to that member. However, I don't see any justification to make an entire class static. Why and when should I make a class static? What benefits do I get from making a class static? I mean, after declaring a static class, one should still declare all members which he/she wants to have access to without instantiation, as static too. This means that for example, Math class could be declared normal (not static), without affecting how developers code. In other words, making a class static or normal is kind of transparent to developers.

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  • IP address and SEO

    - by Joel
    Hello, I currently host 5 websites within a dedicated server I own. I have several questions: Does it matter if I host all my sites on 100.100.100.100 (the server's IP for example) or if I split them into 100.100.100.100, 100.100.100.101 ... 100.100.100.104 (that is, each site on its own IP). Does it matter if I use a C-Class for each website? Do search engines really care if your site has its own c-class? Do search engines penalize a website if it moves its IP? Thanks, Joel

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  • What approach to take for SIMD optimizations

    - by goldenmean
    Hi, I am trying to optimize below code for SIMD operations (8way/4way/2way SIMD whiechever possible and if it gives gains in performance) I am tryin to analyze it first on paper to understand the algorithm used. How can i optimize it for SIMD:- void idct(uint8_t *dst, int stride, int16_t *input, int type) { int16_t *ip = input; uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H; int Ed, Gd, Add, Bdd, Fd, Hd; int i; /* Inverse DCT on the rows now */ for (i = 0; i < 8; i++) { /* Check for non-zero values */ if ( ip[0] | ip[1] | ip[2] | ip[3] | ip[4] | ip[5] | ip[6] | ip[7] ) { A = M(xC1S7, ip[1]) + M(xC7S1, ip[7]); B = M(xC7S1, ip[1]) - M(xC1S7, ip[7]); C = M(xC3S5, ip[3]) + M(xC5S3, ip[5]); D = M(xC3S5, ip[5]) - M(xC5S3, ip[3]); Ad = M(xC4S4, (A - C)); Bd = M(xC4S4, (B - D)); Cd = A + C; Dd = B + D; E = M(xC4S4, (ip[0] + ip[4])); F = M(xC4S4, (ip[0] - ip[4])); G = M(xC2S6, ip[2]) + M(xC6S2, ip[6]); H = M(xC6S2, ip[2]) - M(xC2S6, ip[6]); Ed = E - G; Gd = E + G; Add = F + Ad; Bdd = Bd - H; Fd = F - Ad; Hd = Bd + H; /* Final sequence of operations over-write original inputs. */ ip[0] = (int16_t)(Gd + Cd) ; ip[7] = (int16_t)(Gd - Cd ); ip[1] = (int16_t)(Add + Hd); ip[2] = (int16_t)(Add - Hd); ip[3] = (int16_t)(Ed + Dd) ; ip[4] = (int16_t)(Ed - Dd ); ip[5] = (int16_t)(Fd + Bdd); ip[6] = (int16_t)(Fd - Bdd); } ip += 8; /* next row */ } ip = input; for ( i = 0; i < 8; i++) { /* Check for non-zero values (bitwise or faster than ||) */ if ( ip[1 * 8] | ip[2 * 8] | ip[3 * 8] | ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8] ) { A = M(xC1S7, ip[1*8]) + M(xC7S1, ip[7*8]); B = M(xC7S1, ip[1*8]) - M(xC1S7, ip[7*8]); C = M(xC3S5, ip[3*8]) + M(xC5S3, ip[5*8]); D = M(xC3S5, ip[5*8]) - M(xC5S3, ip[3*8]); Ad = M(xC4S4, (A - C)); Bd = M(xC4S4, (B - D)); Cd = A + C; Dd = B + D; E = M(xC4S4, (ip[0*8] + ip[4*8])) + 8; F = M(xC4S4, (ip[0*8] - ip[4*8])) + 8; if(type==1){ //HACK E += 16*128; F += 16*128; } G = M(xC2S6, ip[2*8]) + M(xC6S2, ip[6*8]); H = M(xC6S2, ip[2*8]) - M(xC2S6, ip[6*8]); Ed = E - G; Gd = E + G; Add = F + Ad; Bdd = Bd - H; Fd = F - Ad; Hd = Bd + H; /* Final sequence of operations over-write original inputs. */ if(type==0){ ip[0*8] = (int16_t)((Gd + Cd ) >> 4); ip[7*8] = (int16_t)((Gd - Cd ) >> 4); ip[1*8] = (int16_t)((Add + Hd ) >> 4); ip[2*8] = (int16_t)((Add - Hd ) >> 4); ip[3*8] = (int16_t)((Ed + Dd ) >> 4); ip[4*8] = (int16_t)((Ed - Dd ) >> 4); ip[5*8] = (int16_t)((Fd + Bdd ) >> 4); ip[6*8] = (int16_t)((Fd - Bdd ) >> 4); }else if(type==1){ dst[0*stride] = cm[(Gd + Cd ) >> 4]; dst[7*stride] = cm[(Gd - Cd ) >> 4]; dst[1*stride] = cm[(Add + Hd ) >> 4]; dst[2*stride] = cm[(Add - Hd ) >> 4]; dst[3*stride] = cm[(Ed + Dd ) >> 4]; dst[4*stride] = cm[(Ed - Dd ) >> 4]; dst[5*stride] = cm[(Fd + Bdd ) >> 4]; dst[6*stride] = cm[(Fd - Bdd ) >> 4]; }else{ dst[0*stride] = cm[dst[0*stride] + ((Gd + Cd ) >> 4)]; dst[7*stride] = cm[dst[7*stride] + ((Gd - Cd ) >> 4)]; dst[1*stride] = cm[dst[1*stride] + ((Add + Hd ) >> 4)]; dst[2*stride] = cm[dst[2*stride] + ((Add - Hd ) >> 4)]; dst[3*stride] = cm[dst[3*stride] + ((Ed + Dd ) >> 4)]; dst[4*stride] = cm[dst[4*stride] + ((Ed - Dd ) >> 4)]; dst[5*stride] = cm[dst[5*stride] + ((Fd + Bdd ) >> 4)]; dst[6*stride] = cm[dst[6*stride] + ((Fd - Bdd ) >> 4)]; } } else { if(type==0){ ip[0*8] = ip[1*8] = ip[2*8] = ip[3*8] = ip[4*8] = ip[5*8] = ip[6*8] = ip[7*8] = ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20); }else if(type==1){ dst[0*stride]= dst[1*stride]= dst[2*stride]= dst[3*stride]= dst[4*stride]= dst[5*stride]= dst[6*stride]= dst[7*stride]= cm[128 + ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20)]; }else{ if(ip[0*8]){ int v= ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20); dst[0*stride] = cm[dst[0*stride] + v]; dst[1*stride] = cm[dst[1*stride] + v]; dst[2*stride] = cm[dst[2*stride] + v]; dst[3*stride] = cm[dst[3*stride] + v]; dst[4*stride] = cm[dst[4*stride] + v]; dst[5*stride] = cm[dst[5*stride] + v]; dst[6*stride] = cm[dst[6*stride] + v]; dst[7*stride] = cm[dst[7*stride] + v]; } } } ip++; /* next column */ dst++; } }

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  • Can't I just use all static methods?

    - by Reddy S R
    What's the difference between the two UpdateSubject methods below? I felt using static methods is better if you just want to operate on the entities. In which situations should I go with non-static methods? public class Subject { public int Id {get; set;} public string Name { get; set; } public static bool UpdateSubject(Subject subject) { //Do something and return result return true; } public bool UpdateSubject() { //Do something on 'this' and return result return true; } } I know I will be getting many kicks from the community for this really annoying question but I could not stop myself asking it. Does this become impractical when dealing with inheritance?

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  • "continue" and "break" for static analysis

    - by B. VB.
    I know there have been a number of discussions of whether break and continue should be considered harmful generally (with the bottom line being - more or less - that it depends; in some cases they enhance clarity and readability, but in other cases they do not). Suppose a new project is starting development, with plans for nightly builds including a run through a static analyzer. Should it be part of the coding guidelines for the project to avoid (or strongly discourage) the use of continue and break, even if it can sacrifice a little readability and require excessive indentation? I'm most interested in how this applies to C code. Essentially, can the use of these control operators significantly complicate the static analysis of the code possibly resulting in additional false negatives, that would otherwise register a potential fault if break or continue were not used? (Of course a complete static analysis proving the correctness of an aribtrary program is an undecidable proposition, so please keep responses about any hands-on experience with this you have, and not on theoretical impossibilities) Thanks in advance!

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  • Linux / C++: Get Internet IP Address (not local computer's IP)

    - by Levo
    How can I programmatically get the Internet IP address? 1) If the computer is directly connected to the Internet using a USB modem. 2) If the computer is connected to the internet via another computer or a modem/router. I there a way to do both? P.S. This link gives exactly the Internet IP, but how can I use it in my program?

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  • Compare range of ip addresses with start and end ip address in MySQL

    - by Maarten
    I have a MySQL table where I store IP ranges. It is setup in the way that I have the start address stored as a long, and the end address (and an id and some other data). Now I have users adding ranges by inputting a start and end ip address, and I would like to check if the new range is not already (partially) in the database. I know I can do a between query, but that doesn't seem to work with 2 different columns, and I also cannot figure out how to pass a range to compare it. Doing it in a loop in PHP is a possibility, but would with a range of e.g. 132.0.0.0-199.0.0.0 be quite a big amount of queries..

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  • IP address spoofing using Source Routing

    - by iamrohitbanga
    With IP options we can specify the route we want an IP packet to take while connecting to a server. If we know that a particular server provides some extra functionality based on the IP address can we not utilize this by spoofing an IP packet so that the source IP address is the privileged IP address and one of the hosts on the Source Routing is our own. So if the privileged IP address is x1 and server IP address is x2 and my own IP address is x3. I send a packet from x1 to x2 which is supposed to pass through x3. x1 does not actually send the packet. It is just that x2 thinks the packet came from x1 via x3. Now in response if x2 uses the same routing policy (as a matter of courtesy to x1) then all packets would be received by x3. Will the destination typically use the same IP address sequences as specified in the routing header so that packets coming from the server pass through my IP where I can get the required information? Can we not spoof a TCP connection in the above case? Is this attack used in practice?

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  • How do I redirect www and non but not IP

    - by Chad T Parson
    I am trying to redirect www.domain.com or domain.com to www.domain.com/temp.html I am using the following code: RewriteCond %{HTTP_HOST} ^.*$ RewriteRule ^/?$ "http\:\/\/www\.domain\.com\/temp\.html" [R=301,L] That works however I do not want to redirect IP. So if someone types in the static IP of the domain then I do not want them to be redirected to www.domain.com/temp.html Anyone have the code to take care of this?

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