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  • How to implement three stacks using a single array.

    - by buried-shopno
    Hi, I came across this problem in an interview website. The problem asks for efficiently implement three stacks in a single array, such that no stack overflows until there is no space left in the entire array space. For implementing 2 stacks in an array, it's pretty obvious: 1st stack grows from LEFT to RIGHT, and 2nd stack grows from RIGHT to LEFT; and when the stackTopIndex crosses, it signals an overflow. Thanks in advance for your insightful answer.

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  • Recursive function causing a stack overflow

    - by dbyrne
    I am trying to write a simple sieve function to calculate prime numbers in clojure. I've seen this question about writing an efficient sieve function, but I am not to that point yet. Right now I am just trying to write a very simple (and slow) sieve. Here is what I have come up with: (defn sieve [potentials primes] (if-let [p (first potentials)] (recur (filter #(not= (mod % p) 0) potentials) (conj primes p)) primes)) For small ranges it works fine, but causes a stack overflow for large ranges: user=> (sieve (range 2 30) []) [2 3 5 7 11 13 17 19 23 29] user=> (sieve (range 2 15000) []) java.lang.StackOverflowError (NO_SOURCE_FILE:0) I thought that by using recur this would be a non-stack-consuming looping construct? What am I missing?

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  • Manual stack backtrace on Windows mobile (SEH)

    - by caahab
    Following situation: I'm developing an windows mobile application using the sdk 6. Target machine is a nautiz x7. To improve the error reporting I want to catch the structured exceptions (SEH) and do a stack backtrace to store some information for analysis. So far I have the information where the exception was thrown (windows core.dll) and I can backtrace the return adresses thru the stack. But what I want to know is, which instruction in my code caused the exception? Does anyone know how to use the available exception and context information to get the appropriate function/instruction address? Unfortunately windows mobile 6 sdk for pocketpc does not support all the helper functions to do stackwalks or mini dumps.

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  • Is this implementation truely tail-recursive?

    - by CFP
    Hello everyone! I've come up with the following code to compute in a tail-recursive way the result of an expression such as 3 4 * 1 + cos 8 * (aka 8*cos(1+(3*4))) The code is in OCaml. I'm using a list refto emulate a stack. type token = Num of float | Fun of (float->float) | Op of (float->float->float);; let pop l = let top = (List.hd !l) in l := List.tl (!l); top;; let push x l = l := (x::!l);; let empty l = (l = []);; let pile = ref [];; let eval data = let stack = ref data in let rec _eval cont = match (pop stack) with | Num(n) -> cont n; | Fun(f) -> _eval (fun x -> cont (f x)); | Op(op) -> _eval (fun x -> cont (op x (_eval (fun y->y)))); in _eval (fun x->x) ;; eval [Fun(fun x -> x**2.); Op(fun x y -> x+.y); Num(1.); Num(3.)];; I've used continuations to ensure tail-recursion, but since my stack implements some sort of a tree, and therefore provides quite a bad interface to what should be handled as a disjoint union type, the call to my function to evaluate the left branch with an identity continuation somehow irks a little. Yet it's working perfectly, but I have the feeling than in calling the _eval (fun y->y) bit, there must be something wrong happening, since it doesn't seem that this call can replace the previous one in the stack structure... Am I misunderstanding something here? I mean, I understand that with only the first call to _eval there wouldn't be any problem optimizing the calls, but here it seems to me that evaluation the _eval (fun y->y) will require to be stacked up, and therefore will fill the stack, possibly leading to an overflow... Thanks!

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  • R: How to get a stack trace from the snow package

    - by Keith
    How can I get a stack trace back from a snow node after an error occurs? I am using the snow package (version 0.3-3) on R 2.10.1 and I'm getting errors when I use parSapply that do not occur when I use sapply. Snow is nice enough to give me the error message but it would be much more useful for me to have the kind of stack trace you can get from traceback(). So far I have tried: options(showWarnCalls = T, showErrorCalls = T) setDefaultClusterOptions(outfile = "/dev/tty") and options(error=traceback) setDefaultClusterOptions(outfile = "/dev/tty") without luck. I'm currently just testing with a local cluster ie: makeSOCKcluster(c("localhost","localhost")) but I will eventually be using an MPI cluster. Thanks.

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  • stack dump accessing malloc char array

    - by robUK
    Hello, gcc 4.4.3 c89 I have the following source code. And getting a stack dump on the printf. char **devices; devices = malloc(10 * sizeof(char*)); strcpy(devices[0], "smxxxx1"); printf("[ %s ]\n", devices[0]); /* Stack dump trying to print */ I am thinking that this should create an char array like this. devices[0] devices[1] devices[2] devices[4] etc And each element I can store my strings. Many thanks for any suggestions,

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  • Messing with the stack in assembly and c++

    - by user246100
    I want to do the following: I have a function that is not mine (it really doesn't matter here but just to say that I don't have control over it) and that I want to patch so that it calls a function of mine, preserving the arguments list (jumping is not an option). What I'm trying to do is, to put the stack pointer as it was before that function is called and then call mine (like going back and do again the same thing but with a different function). This doesn't work straight because the stack becomes messed up. I believe that when I do the call it replaces the return address. So, I did a step to preserve the return address saving it in a globally variable and it works but this is not ok because I want it to resist to recursitivy and you know what I mean. Anyway, i'm a newbie in assembly so that's why I'm here. Please, don't tell me about already made software to do this because I want to make things my way. Of course, this code has to be compiler and optimization independent. My code (If it is bigger than what is acceptable please tell me how to post it): // A function that is not mine but to which I have access and want to patch so that it calls a function of mine with its original arguments void real(int a,int b,int c,int d) { } // A function that I want to be called, receiving the original arguments void receiver(int a,int b,int c,int d) { printf("Arguments %d %d %d %d\n",a,b,c,d); } long helper; // A patch to apply in the "real" function and on which I will call "receiver" with the same arguments that "real" received. __declspec( naked ) void patch() { _asm { // This first two instructions save the return address in a global variable // If I don't save and restore, the program won't work correctly. // I want to do this without having to use a global variable mov eax, [ebp+4] mov helper,eax push ebp mov ebp, esp // Make that the stack becomes as it were before the real function was called add esp, 8 // Calls our receiver call receiver mov esp, ebp pop ebp // Restores the return address previously saved mov eax, helper mov [ebp+4],eax ret } } int _tmain(int argc, _TCHAR* argv[]) { FlushInstructionCache(GetCurrentProcess(),&real,5); DWORD oldProtection; VirtualProtect(&real,5,PAGE_EXECUTE_READWRITE,&oldProtection); // Patching the real function to go to my patch ((unsigned char*)real)[0] = 0xE9; *((long*)((long)(real) + sizeof(unsigned char))) = (char*)patch - (char*)real - 5; // calling real function (I'm just calling it with inline assembly because otherwise it seems to works as if it were un patched // that is strange but irrelevant for this _asm { push 666 push 1337 push 69 push 100 call real add esp, 16 } return 0; }

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  • C++ Stack Overflow

    - by PhilMAN
    Here is some code: void main() { GameEngine ge("phil", "anotherguy"); string response; do { ge.playGame(); cout << endl << "Do you want to (r)eplay the same battle, (s)tart a new battle, or (q)uit? "; cin >> response; } while(response == "r" || response == "R" || response == "s" || response == "S" ); } GameEngine::GameEngine(string name1, string name2) { p1Name = name1; p2Name = name2; } void GameEngine::playGame() { cout << "PLAY GAME" << endl; Army p1, p2; Battlefield testField; RuleSet rs; int xSize = 13; // Number of rows int ySize = 13; // Number of columns loadData(p1, p2, testField, rs, xSize, ySize); ... } void GameEngine::loadData(Army& p1, Army& p2, Battlefield& testField, RuleSet& rs, int& xSize, int& ySize) { string terrain = BattlefieldUtils::pickTerrain(); string armySplit[14];//id index 1 string ruleSplit[19];//in index 7 string armyP1, armyP2, ruleSet; Skill p1Skills[8]; Skill p2Skills[8]; CreatureStack p1Stacks[20]; CreatureStack p2Stacks[20]; ... } CreatureStack(){quantity = 0; isLive = false; id = -1;}; Army(){}; Battlefield(){}; RuleSet(){}; I have posted every line of code that executes until the program crashes. This code ran fine for a long time, I added some stuff that does not even execute until way after the code I have posted here, and bam stack overflow that occurs at GameEngine::loadData() line: CreatureStack p2Stacks[20]; will not go away. What am I doing wrong here? Is that all the stack can handle? I increased the stack size in Visual Studio and got the error to go away, but that slowed things down considerably, so I would rather just get to the source of the issue and fix that.

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  • Stack , data and address space limits on an Ubuntu server

    - by PaulDaviesC
    I am running an Ubuntu server which has around 5000 users. The users are allowed to SSH in to the system. So in order to cap the memory used up by a process I have capped the address space limits using limits.conf. So my question is , should I be limiting the data and stack ? I feel that is not required since I am capping address space. Are there any pitfalls if I do not cap the stack and data limits?

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  • setting up/installing/configuring nginx LEMP stack on fresh VPS server

    - by Grant Tailor
    I need some help in settingup/installing and configuring nginx LEMP stack on a fresh new VPS I have. The specs of the CentOS 5.7 VPS are 2GB DDR3 ECC RAM(4GB burst), 1 core 1.5Ghz(3Ghz burst) and 100GB RAID 10 storage, unmetered bandwidth @ 100Mpbs all for a whopping $25/month(unbeatable, yeah I know :) Anyways I have followed this LEMP (will also need MySQL and PHP) stack guide on linode http://library.linode.com/lemp-guides/centos-5 but basically what I want is to be able to host multiple website on this webserver after everything is setup. I am used to using DirectAdmin control panel on other server and want to have things setup so I can host multiple websites - mostly wordpress and drupal themes. Lets say 10 websites on this nginx web server. So can someone please help me on what I need to do to take "full" advantage of nginx power and performance, while been able to easily manage these multiple websites (wordpress and drupal themes)?

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  • SQLAuthority News – Author Visit Review – TechMela Nepal – March 29-30, 2010

    - by pinaldave
    I was very fortunate to attend TechMela at Kathmandu, Nepal on 29th and 30th of March 2010. I would like to thank Allen Bailochan Tuladhar from Microsoft MDP Nepal for inviting me. Allen is a person with seemingly infinite energy and unlimited passion for Microsoft Technology. If you get an opportunity to spend just one hour with him, you will surely be more enthusiastic with regards to Microsoft Technology. And, I was lucky enough that I was able to spend about a total of 9 days with him in Kathmandu, working along with him in the Tech Community. TechMela Nepal Pinal at TechMela, Nepal TechMela is considered as one of the biggest events in Nepal, having been organized by Microsoft MDP Nepal. This event was attended by around 500 students and hundreds of Tech professionals. The event was handled very professionally and at very large scale. Every minor detail was properly planned and obviously thought out well. There were around 50+ volunteers from MS MDP who were monitoring this event systematically to make sure the event would run as smooth as planned. Attendees in Geek T-Shirts During this event, I was delighted to meet David Lim of Microsoft Singapore. He is very passionate in working for Microsoft Technology, as well as building deep relations with the Community. I was fortunate to spend my entire afternoon with him during the sight-seeing trip. We discussed various MS technologies and their community’s adoption as well as the way how each of us can be a part of the community activity. He also delivered excellent keynotes at the event. I must say that this is one of the most enjoyable keynotes I have ever attended. It was interesting and interactive, and I must say that I had the 70s feelings with all the fonts and graphics. I still remember him saying, “Yeah, I was a student and I know you.” Allen Tuladhar, David Lim, Pinal Dave and Guests After the keynote, everybody cheered when Allen came on stage to talk about the event and to introduce the agenda for the next two days. I must say that Allen is one of the most well-known people in Nepal. I was impressed with his popularity, and to prove this, when he got on the stage he had to wait for a long full minute before he was able to greet “Welcome” while the attendees were clapping and cheering. Technology Panelist at Techmela Kathmandu, Nepal This event was blessed with the top-of-the-top officials of various IT industries, Nepal ministries and the US Embassy. All the prominent personalities were present for panel discussion on the stage. The talk was done on various subjects. Also, the energy level which was set by Allen really echoed in the audience as they asked certain questions on different global as well local IT-related questions. The panel discussion really was discussion instead of usual monologue of one person. Pinal Dave presending at TechMela Kathmandu, Nepal This was a two-day event and my session was on either of the day. I had a great participation from the audience on both days. The place where the event was organized had a capacity of around 500+ audience. Both of my sessions were heavily attended and volunteers did a fabulous job helping the attendees find empty seats or arrange some additional seats. I was overwhelmed with the interaction I have received in the large hall. Attendees were not so shy to express their thoughts, so both the sessions were followed up by top notch one-on-one conversations for a couple of hours. Pinal Dave presending at TechMela Kathmandu, Nepal Pinal Dave presending at TechMela Kathmandu, Nepal Pinal Dave presending at TechMela Kathmandu, Nepal There are many questions that I have received during the event, and many of them can be interesting for all of us here so I will write detailed blog posts on these subjects. I also tried to participate in the gaming activities held at the event, but I felt I was kind of lost even if I was only playing for the very first minutes. This made me realize that I am really getting old for video games. Allen presending at TechMela Kathmandu, Nepal Allen’s session on Digital Photography was very impressive as he demonstrated so many features of the Windows Live Product that at one point I felt he is MVP for Windows Live. In fact, he demonstrated how all the Microsoft products work together to give users an excellent desktop experience; no wonder he is an MVP for Windows Desktop Experience. Pinal Dave presending at TechMela Kathmandu, Nepal Any event has two common dilemmas – food and logistics. However, this event had excellent food and state-of-the-art organization. I was very glad that this two-day event turned out to be one of the most successful events in Nepal. I also noticed that almost all attendees rate their experience as beyond expectation and truly exceptional. Pinal Dave and Allen Bailochan Tuladhar If you ever get invited by Allen in any of his event, I strongly suggest that you drop all your plans and scheduled stuff, and accept his invitation. For sure, the event will be a very memorable one and would be your once-in-a-lifetime experience. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: MVP, Pinal Dave, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority Author Visit, SQLAuthority News, T SQL, Technology

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  • SQLAuthority News – Author Visit Review – TechMela Nepal – March 29-30, 2010

    - by pinaldave
    I was very fortunate to attend TechMela at Kathmandu, Nepal on 29th and 30th of March 2010. I would like to thank Allen Bailochan Tuladhar from Microsoft MDP Nepal for inviting me. Allen is a person with seemingly infinite energy and unlimited passion for Microsoft Technology. If you get an opportunity to spend just one hour with him, you will surely be more enthusiastic with regards to Microsoft Technology. And, I was lucky enough that I was able to spend about a total of 9 days with him in Kathmandu, working along with him in the Tech Community. TechMela Nepal Pinal at TechMela, Nepal TechMela is considered as one of the biggest events in Nepal, having been organized by Microsoft MDP Nepal. This event was attended by around 500 students and hundreds of Tech professionals. The event was handled very professionally and at very large scale. Every minor detail was properly planned and obviously thought out well. There were around 50+ volunteers from MS MDP who were monitoring this event systematically to make sure the event would run as smooth as planned. Attendees in Geek T-Shirts During this event, I was delighted to meet David Lim of Microsoft Singapore. He is very passionate in working for Microsoft Technology, as well as building deep relations with the Community. I was fortunate to spend my entire afternoon with him during the sight-seeing trip. We discussed various MS technologies and their community’s adoption as well as the way how each of us can be a part of the community activity. He also delivered excellent keynotes at the event. I must say that this is one of the most enjoyable keynotes I have ever attended. It was interesting and interactive, and I must say that I had the 70s feelings with all the fonts and graphics. I still remember him saying, “Yeah, I was a student and I know you.” Allen Tuladhar, David Lim, Pinal Dave and Guests After the keynote, everybody cheered when Allen came on stage to talk about the event and to introduce the agenda for the next two days. I must say that Allen is one of the most well-known people in Nepal. I was impressed with his popularity, and to prove this, when he got on the stage he had to wait for a long full minute before he was able to greet “Welcome” while the attendees were clapping and cheering. Technology Panelist at Techmela Kathmandu, Nepal This event was blessed with the top-of-the-top officials of various IT industries, Nepal ministries and the US Embassy. All the prominent personalities were present for panel discussion on the stage. The talk was done on various subjects. Also, the energy level which was set by Allen really echoed in the audience as they asked certain questions on different global as well local IT-related questions. The panel discussion really was discussion instead of usual monologue of one person. Pinal Dave presenting at TechMela Kathmandu, Nepal This was a two-day event and my session was on either of the day. I had a great participation from the audience on both days. The place where the event was organized had a capacity of around 500+ audience. Both of my sessions were heavily attended and volunteers did a fabulous job helping the attendees find empty seats or arrange some additional seats. I was overwhelmed with the interaction I have received in the large hall. Attendees were not so shy to express their thoughts, so both the sessions were followed up by top notch one-on-one conversations for a couple of hours. Pinal Dave presenting at TechMela Kathmandu, Nepal Pinal Dave presenting at TechMela Kathmandu, Nepal There are many questions that I have received during the event, and many of them can be interesting for all of us here so I will write detailed blog posts on these subjects. I also tried to participate in the gaming activities held at the event, but I felt I was kind of lost even if I was only playing for the very first minutes. This made me realize that I am really getting old for video games. Allen presenting at TechMela Kathmandu, Nepal Allen’s session on Digital Photography was very impressive as he demonstrated so many features of the Windows Live Product that at one point I felt he is MVP for Windows Live. In fact, he demonstrated how all the Microsoft products work together to give users an excellent desktop experience; no wonder he is an MVP for Windows Desktop Experience. Pinal Dave presending at TechMela Kathmandu, Nepal Any event has two common dilemmas – food and logistics. However, this event had excellent food and state-of-the-art organization. I was very glad that this two-day event turned out to be one of the most successful events in Nepal. I also noticed that almost all attendees rate their experience as beyond expectation and truly exceptional. Pinal Dave and Allen Bailochan Tuladhar If you ever get invited by Allen in any of his event, I strongly suggest that you drop all your plans and scheduled stuff, and accept his invitation. For sure, the event will be a very memorable one and would be your once-in-a-lifetime experience. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: MVP, Pinal Dave, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority Author Visit, SQLAuthority News, T SQL, Technology

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  • Hiring New IT Employees versus Promoting Internally for IT Positions

    Recently I was asked my opinion regarding the hiring of IT professionals in regards to the option of hiring new IT employees versus promoting internally for IT positions. After thinking a little more about this question regarding staffing, specifically pertaining to promoting internally verses new employees; I think my answer to this question is that it truly depends on the situation. However, in most cases I would side with promoting internally. The key factors in this decision should be based on a company/department’s current values, culture, attitude, and existing priorities.  For example if a company values retaining all of its hard earned business knowledge then they would tend to promote existing employees internal over hiring a new employee. Moreover, the company will have to pay to train an existing employee to learn a new technology and the learning curve for some technologies can be very steep. Conversely, if a company values new technologies and technical proficiency over business knowledge then a company would tend to hire new employees because they may already have experience with a technology that the company is planning on using. In this scenario, the company would have to take on the additional overhead of allowing a new employee to learn how the business operates prior to them being fully effective. To illustrate my points above let us look at contractor that builds in ground pools for example.  He has the option to hire employees that are very strong but use small shovels to dig, or employees weak in physical strength but use large shovels to dig. Which employee should the contractor use to dig a hole for a new in ground pool? If we compare the possible candidates for this job we will find that they are very similar to hiring someone internally verses a new hire. The first example represents the existing workers that are very strong regarding the understanding how the business operates and the reasons why in a specific manner. However this employee could be potentially weaker than an outsider pertaining to specific technologies and would need some time to build their technical prowess for a new position much like the strong worker upgrading their shovels in order to remove more dirt at once when digging. The other employee is very similar to hiring a new person that may already have the large shovel but will need to increase their strength in order to use the shovel properly and efficiently so that they can move a maximum amount of dirt in a minimal amount of time. This can be compared to new employ learning how a business operates before they can be fully functional and integrated in the company/department. Another key factor in this dilemma pertains to existing employee and their passion for their work, their ability to accept new responsibility when given, and the willingness to take on responsibilities when they see a need in the business. As much as possible should be considered in this decision down to the mood of the team, the quality of existing staff, learning cure for both technology and business, and the potential side effects of the existing staff.  In addition, there are many more consideration based on the current team/department/companies culture and mood. There are several factors that need to be considered when promoting an individual or hiring new blood for a team. They both can provide great benefits as well as create controversy to a group. Personally, staffing especially in the IT world is like building a large scale system in that all of the components and modules must fit together and preform as one cohesive system in the same way a team must come together using their individually acquired skills so that they can work as one team.  If a module is out of place or is nonexistent then the rest of the team will suffer until the all of its issues are addressed and resolved. Benefits of Promoting Internally Internal promotions give employees a reason to constantly upgrade their technology, business, and communication skills if they want to further their career Employees can control their own destiny based on personal desires Employee already knows how the business operates Companies can save money by promoting internally because the initial overhead of allowing new hires to learn how a company operates is very expensive Newly promoted employees can assist in training their replacements while transitioning to their new role within a company. Existing employees already have a proven track record in regards fitting in with the business culture; this is always an unknown with all new hires Benefits of a New Hire New employees can energize and excite existing employees New employees can bring new ideas and advancements in technology New employees can offer a different perspective on existing issues based on their past experience. As you can see the decision to promote an existing employee from within a company verses hiring a new person should be based on several factors that should ultimately place the business in the best possible situation for the immediate and long term future. How would you handle this situation? Would you hire a new employee or promote from within?

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  • SQLAuthority News – NuoDB MeetUp on Nov 8, 2012 in Seattle

    - by pinaldave
    I am pleased to let you know that I will be attending again this year’s SQLPASS conference in Seattle and look forward to meeting all of you while at the conference. In the next two weeks, I will provide you with a full agenda of where I will be during PASS. During the week, I will also be stopping by at the NuoDB MeetUp, which will be held close by at the Edge Grill at 1522 6th Ave in Seattle on Thursday, November 8th. This will be an excellent opportunity for you to learn more about their brand new distributed, peer-to-peer database solution, which I believe will revolutionize SQL cloud database technology in the 21th century.  I have been personally following NuoDB for months now and am very excited about the architecture and capabilities of this innovative product. Wiqar Chaudry, NuoDB technology evangelist, will give a presentation and demonstration of their elastically scalable SQL cloud database in this Meetup event.  Prior to joining NuoDB, Wiqar was a Senior Architect at Epsilon, the data intelligence company with big brand name customers in insurance, consumer goods, etc.  He’s also going to discuss how NuoDB compares with Azure, the hometown favorite, and why cloud-based SQL deployment will pave the way for the future. I will be at the NuoDB MeetUp to briefly talk about my own experiences with NuoDB and will be giving away some signed copies of my latest book as well will have some interesting goodies. So please join me and the NuoDB team at their Meetup event. RSVP here. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: NuoDB

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  • Impact of Service Oriented Architecture (SOA) on Business and IT Operations

    The impact of Service Oriented Architecture (SOA) on business and IT operations varies from company to company. I think more and more companies are starting to view SOA as just another technology that they can incorporate in an existing or new system. One of the driving factors in using SOA is the reduction in maintenance costs and decrease in the time needed to bring products to market. The reductions in costs, and reduced turnaround time can be directly converted in to increased profitability due to less expenditures that are needed in order to maintain or create new systems. My personal perspective on SOA is that it is great for what it is actually intended to do. SOA allows systems to be distributed across networks or even the world while ensuring enterprise processing consistency, data integrity and preventing code duplication. This being said a lot of preparation and work goes into properly designing and implementing an SOA especially if an enterprise wants to take full advantage of its benefits. Even though SOA has recently gotten a lot of hype about its benefits it does not a perfect fit for all situations. At the end of the day SOA is just another tool in my tool belt that I can pull from to create solutions that meet the business’s needs. Based on current industry trends SOA appears to be a very solid technology to use moving forward, especially as more and more companies shift towards cloud based computing. It is important to remember that SOA is one of many technologies that can be used in creating business solutions and I think more time will be spent in the future evaluating if SOA is the right technology for a solution once the initial hype of SOA has calmed down.

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  • HP-UX: libstd_v2 in stack trace of JNI code compiled with g++

    - by Miguel Rentes
    Hello, uname -mr: B.11.23 ia64 g++ --version: g++ (GCC) 4.4.0 java -version: Java(TM) SE Runtime Environment (build 1.6.0.06-jinteg_20_jan_2010_05_50-b00) Java HotSpot(TM) Server VM (build 14.3-b01-jre1.6.0.06-rc1, mixed mode) I'm trying to run a Java application that uses JNI. It is crashing inside the JNI code with the following (abbreviated) stack trace: (0) 0xc0000000249353e0 VMError::report_and_die{_ZN7VMError14report_and_dieEv} + 0x440 at /CLO/Components/JAVA_HOTSPOT/Src/src/share/vm/utilities/vmError.cpp:738 [/opt/java6/jre/lib/IA64W/server/libjvm.so] (1) 0xc000000024559240 os::Hpux::JVM_handle_hpux_signal{_ZN2os4Hpux22JVM_handle_hpux_signalEiP9 __siginfoPvi} + 0x760 at /CLO/Components/JAVA_HOTSPOT/Src/src/os_cpu/hp-ux_ia64/vm/os_hp-ux_ia64.cpp:1051 [/opt/java6/jre/lib/IA64W/server/libjvm.so] (2) 0xc0000000245331c0 os::Hpux::signalHandler{_ZN2os4Hpux13signalHandlerEiP9__siginfoPv} + 0x80 at /CLO/Components/JAVA_HOTSPOT/Src/src/os/hp-ux/vm/os_hp-ux.cpp:4295 [/opt/java6/jre/lib/IA64W/server/libjvm.so] (3) 0xe00000010e002620 ---- Signal 11 (SIGSEGV) delivered ---- (4) 0xc0000000000d2d20 __pthread_mutex_lock + 0x400 at /ux/core/libs/threadslibs/src/common/pthreads/mutex.c:3895 [/usr/lib/hpux64/libpthread.so.1] (5) 0xc000000000342e90 __thread_mutex_lock + 0xb0 at ../../../../../core/libs/libc/shared_em_64/../core/threads/wrappers1.c:273 [/usr/lib/hpux64/libc.so.1] (6) 0xc00000000177dff0 _HPMutexWrapper::lock{_ZN15_HPMutexWrapper4lockEPv} + 0x90 [/usr/lib/hpux64/libstd_v2.so.1] (7) 0xc0000000017e9960 std::basic_string,std::allocator{_ZNSsC1ERKSs} + 0x80 [/usr/lib/hpux64/libstd_v2.so.1] (8) 0xc000000008fd9fe0 JniString::str{_ZNK9JniString3strEv} + 0x50 at eg_handler_jni.cxx:50 [/soft/bus-7_0/lib/libbus_registry_jni.so.7.0.0] (9) 0xc000000008fd7060 pt_efacec_se_aut_frk_cmp_registry_REGHandler::getKey{_ZN44pt_efacec_se_aut_frk_cmp_registry_REGHandler6getKeyEP8_jstringi} + 0xa0 [/soft/bus-7_0/lib/libbus_registry_jni.so.7.0.0] (10) 0xc000000008fd17f0 Java_pt_efacec_se_aut_frk_cmp_registry_REGHandler_getKey__Ljava_lang_String_2I + 0xa0 [/soft/bus-7_0/lib/libbus_registry_jni.so.7.0.0] (11) 0x9fffffffdf400ed0 Internal error (-3) while unwinding stack [/CLO/Components/JAVA_HOTSPOT/Src/src/os_cpu/hp-ux_ia64/vm/thread_hp-ux_ia64.cpp:142] This JNI code and dependencies are being compiled using g++, are multithreaded and 64 bit (-pthread -mlp64 -shared -fPIC). The LD_LIBRARY_PATH environment variable is set the dependencies location, and running ldd on the JNI shared libraries finds them all: ldd libbus_registry_jni.so: libefa-d.so.7 = /soft/bus-7_0/lib/libefa-d.so.7 libbus_registry-d.so.7 = /soft/bus-7_0/lib/libbus_registry-d.so.7 libboost_thread-gcc44-mt-d-1_41.so = /usr/local/lib/libboost_thread-gcc44-mt-d-1_41.so libboost_system-gcc44-mt-d-1_41.so = /usr/local/lib/libboost_system-gcc44-mt-d-1_41.so libboost_regex-gcc44-mt-d-1_41.so = /usr/local/lib/libboost_regex-gcc44-mt-d-1_41.so librt.so.1 = /usr/lib/hpux64/librt.so.1 libstdc++.so.6 = /opt/hp-gcc-4.4.0/lib/gcc/ia64-hp-hpux11.23/4.4.0/../../../hpux64/libstdc++.so.6 libm.so.1 = /usr/lib/hpux64/libm.so.1 libgcc_s.so.0 = /opt/hp-gcc-4.4.0/lib/gcc/ia64-hp-hpux11.23/4.4.0/../../../hpux64/libgcc_s.so.0 libunwind.so.1 = /usr/lib/hpux64/libunwind.so.1 librt.so.1 = /usr/lib/hpux64/librt.so.1 libm.so.1 = /usr/lib/hpux64/libm.so.1 libunwind.so.1 = /usr/lib/hpux64/libunwind.so.1 libdl.so.1 = /usr/lib/hpux64/libdl.so.1 libunwind.so.1 = /usr/lib/hpux64/libunwind.so.1 libc.so.1 = /usr/lib/hpux64/libc.so.1 libuca.so.1 = /usr/lib/hpux64/libuca.so.1 Looking at the stack trace, it seams odd that, although ldd list g++'s libstdc++ is being used, the std:string copy c'tor being reported as used is the one in libstd_v2, the implementation provided by aCC. The crash happens in the following code, when method str() returns: class JniString { std::string m_utf8; public: JniString(JNIEnv* env, jstring instance) { const char* utf8Chars = env-GetStringUTFChars(instance, 0); if (utf8Chars == 0) { env-ExceptionClear(); // RPF throw std::runtime_error("GetStringUTFChars returned 0"); } m_utf8.assign(utf8Chars); env-ReleaseStringUTFChars(instance, utf8Chars); } std::string str() const { return m_utf8; } }; Simultaneous usage of the two C++ implementations could likely be a reason for the crash, but that should not be happening. Any ideas?

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  • What good technology/programming vodcasts are out there?

    - by Sam Saffron
    I'm trying to round up a list of programming/technology related Vodcasts. Related Question: What good technology podcasts are out there? Here I am looking for podcasts which include Video content like: dnr tv : http://www.dnrtv.com/ Channel 9 : http://channel9.msdn.com/ Dimecasts : http://dimecasts.net/ Railscasts : http://railscasts.com/ Zendcasts : http://www.zendcasts.com/ Net Tuts : http://net.tutsplus.com/category/videos/screencasts/ Feel free to edit this post, and improve the list. (with perhaps university lectures in RSS formats etc etc... ) For the voting to have even a slight amount of meaning please include only one vodcast per post. If this is a dupe, let me know and ill delete it.

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  • Which is the UI technology of the future considering: eye-candy-effect, interactivity (gestures, voc

    - by user193655
    If you had to write a next-gen application, in which on the surface (UI) you need some "futuristic features", by considering the following aspects which is the choice you'd make? 1) eye-candy: cool UI, 3D, Effects, nice graphics, sound transitions... 2) user interaction: not only mouse and keyboard but touch, voice and more.... + user interactivity aspect, which is the technology you'd choose? 3) X-platform: this is to have some X-platform discussion. Of course single platform technologies (as WPF) have may be some more power, anyway in a general discussion considering X-platform as a resource is important 4) available components: of course the coolest technology with no available components is may be an option for a component developer but not for an application developer My question is generic, but anyway * have in mind data-driven apps, not pure multimedia apps, videogames, ....

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  • recommend a server side technology for gwt (beginner)

    - by user486503
    hi all ! I am developing a gwt project and am looking for an appropriate server side technology. it should support be open source and support user login (and not using openID...) with password recovery etc it seems that the de-facto standard would be spring + hibernate. however, I am unfamiliar with neither of them and understand that the learning curve (especially for spring) is very high. gwt was quite easy to learn using GOOG's excellent online tutorials but the spring equivalent seem to impose lots of configuration files and deeper understanding of its internals. so I am looking for a simpler server side technology to deploy my gwt app. I am definitely prepared to learn a new framework if necessary but not something that would take me 2 months just to understand the fundamentals... any ideas...?

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