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  • What top companies look for in an Interview?

    - by Geek
    Basically I am looking for what is it that you goof up and you are out from the remaining process ? Are elimination rounds a fair way to judge a person ? Anyone can have a bad hour :-( Should you code the best possible or should you get the Algorithm right ? I generally first code a workable solution and then work on it till a level I think it looks beautiful to me. Is this a wrong approach ? Recently I had a telephonic interview in which I was asked to write a variation of Level Order traversal in 20 minutes. I could get the Algorithm and working code in 20 minutes but couldn't get the Exception handling and the coding convention right, after which I didn't hear back from them :-( All the other questions in the interview went very well this was the only thing which was 'not upto the mark'. Needless to say I like the company and will apply again but want to get it right the next time :-) Please share your experiences and valuable suggestions.

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  • Blueprints API for Oracle NoSQL Database

    - by Charles Lamb
    Here's an implementation of the Blueprints API for Oracle NoSQL Database. https://github.com/dwmclary/blueprints-oracle-nosqldb Blueprints is a collection of interfaces, implementations, ouplementations, and test suites for the property graph data model. Blueprints is analogous to the JDBC, but for graph databases. As such, it provides a common set of interfaces to allow developers to plug-and-play their graph database backend. Moreover, software written atop Blueprints works over all Blueprints-enabled graph databases. Within the TinkerPop software stack, Blueprints serves as the foundational technology for: Pipes: A lazy, data flow framework Gremlin: A graph traversal language Frames: An object-to-graph mapper Furnace: A graph algorithms package Rexster: A graph server

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  • Find kth smallest element in a binary search tree in Optimum way

    - by Bragaadeesh
    Hi, I need to find the kth smallest element in the binary search tree without using any static/global variable. How to achieve it efficiently? The solution that I have in my mind is doing the operation in O(n), the worst case since I am planning to do an inorder traversal of the entire tree. But deep down I feel that I am not using the BST property here. Is my assumptive solution correct or is there a better one available ?

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  • Can a Silverlight application authenticate versus a local LDAP/ActiveDirectory Server

    - by caryden
    If I have an externally hosted application (www.outside.com) outside the firewall but users within a company wanted to be able to enable LDAP authentication against their local (behind the firewall) AD server (acting as LDAP) or other LDAP server (call it ldap.inside.com), how would this be done. It seems technically possible in that when a user tried to login to outside.com through a client-side silverlight interface, that the SL app could connect to the outside.com login service and be told to authenticate that user against ldap.inside.com. The SL app would make the calls to ldap.inside.com to authenticate the user. Of course, there is the issue of how the server is notified securely that the client authenticated itself...Has anyone done this?

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  • AnkhSVN Commits Are Very Slow

    - by jakdep
    Recently, I had to move my SVN repositories to a different server, but I am experiencing some performance problems since the move. I am using Visual Studio 2005, AnkhSVN 2.1.7819.411 and TortoiseSVN 1.6.6 on my workstation and VisualSVN Server on the server which runs Windows Server 2008. Whenever I try to commit a file or view the file history in Visual Studio it takes twenty odd seconds. I confirmed that an exception has been made for VisualSVN Server on the server's firewall, but when I disable the server's firewall the performance is back to normal (1-2 seconds for a commit). When I do a commit or check the log on a file in TortoiseSVN the performance is fine as well. To ensure that the problem was not related to the moving of the repositories, I am running these tests against a new repository which was created on the new server. So, I reckon the problem lies with AnkhSVN, but am at a loss as how to diagnose it further. Any help would be greatly appreciated.

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  • C# How to communicate between 2 servers

    - by Chau
    I have a website running ASP.NET (C#) on server A. I need my website to access a webservice on server B. server B will only accept incoming requests if the requestee is located within a certain IP range and server A is not within this range. I have a server server C which is located within the IP range and the only thing blocking server A from server C is a firewall (which I have access to). It must be possible to create a hole in the firewall between server A and server C, but my question is: How do I relay the request from server A to server B via server C? I need the response from server B to get back to server A also :) Thanks in advance.

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  • Debugging stored procedures, without using SSMS 2008 Debugger, or the Visual Studio debugger (output

    - by Albert
    I have a SQL Server 2005 database with some Stored Procedures (SP) that I would like to debug...essentially I would just like to check variable values at certain points throughout the SP execution. I have SSMS 2008, but when I try to use the debugger, I get an error that it can't debug SQL Server 2005 databases. And I can't use the Visual Studio debugger (by stepping into the SP via Server Explorer) because Remote Debugging is blocked by our firewall, and I'm rightfully not allowed to touch the firewall. So my question is how can I check variable values at certain points in the SP execution? Is there some way to output those values somewhere, perhaps along with some text?

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  • Accessing SQL Server using an IP Address and Port Number ... Help!

    - by Mike
    I need to access an SQL Server that is on a machine behind a firewall and you access this machine using an ip address like 95.95.95.33:6930 (not the real ip address) ... But, you get my point that by accessing 95.95.95.33 on port 6930, the firewall routes the requests to that particular machine ... My question is ... How do you construct a connection string to access the machine at address 95.95.95.33:6930 and then further access the SQL Server on port 1433 or maybe a different port like 8484 ??? Thanks Mike

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  • How does a WCF server inform a WCF client about changes? (Better solution then simple polling, e.g.

    - by Ian Ringrose
    see also "WCF push to client through firewall" I need to have a WCF client that connect to a WCF server, then when some of the data changes on the server the clients need to update its display. As there is likely to be a firewall between the clients and the server. All communications must be over HTTP The server can not make an (physical) outgoing call to the client. As I am writing both the client and the server I do not need to limit the solution to only using soap etc. I am looking for built in surport for "long polling" / "Comet" etc Thanks for the most informative answer from Drew Marsh on how to implement long polling in WCF. However I thought the main “selling point” of WCF was that you could do this sort of thing just by configuring the channels to be used in the config file. E.g I want a channel that logically two way but physically incoming only.

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  • How to build a function on the fly in java?

    - by stereos
    I'm parsing a text file that is being mapped to some java code like such: public void eval(Node arg) { if(arg.data.equals("rand")) { moveRandomly(); } else if(arg.data.equals("home")) { goHome(); }//snip.. This is going to need to be re-evaluated about a thousand times and I'd rather not have to traverse the whole thing every time. Is there any way to make this traversal once and then have it be a function that is called every other time?

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  • ASP.NET Connection time out after being idle for a while

    - by yazz
    My ASP.NET website while trying to connect to the database for first time after a period of inactivity throws an time out exception. I understand the connections in the connection pool get terminated after some idle time for some reason (Firewall or Oracle settings) and the pool or app doesn't have a clue about it. Is there any way to validate the connection beforehand so that the first try doesn't throw an exception? I don't have much control over the DB or Firewall settings. So I have to deal with this is my application.(would prefer if there is any web.config settings) I am using: ASP.NET 2.0. Oracle server 11g, Microsoft Enterprise Library DAAB to do all my DB operations. I did some search on this topic but didnt find any solid solution for this yet :(

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  • Using boost::iterator

    - by Neil G
    I wrote a sparse vector class (see #1, #2.) I would like to provide two kinds of iterators: The first set, the regular iterators, can point any element, whether set or unset. If they are read from, they return either the set value or value_type(), if they are written to, they create the element and return the lvalue reference. Thus, they are: Random Access Traversal Iterator and Readable and Writable Iterator The second set, the sparse iterators, iterate over only the set elements. Since they don't need to lazily create elements that are written to, they are: Random Access Traversal Iterator and Readable and Writable and Lvalue Iterator I also need const versions of both, which are not writable. I can fill in the blanks, but not sure how to use boost::iterator_adaptor to start out. Here's what I have so far: template<typename T> class sparse_vector { public: typedef size_t size_type; typedef T value_type; private: typedef T& true_reference; typedef const T* const_pointer; typedef sparse_vector<T> self_type; struct ElementType { ElementType(size_type i, T const& t): index(i), value(t) {} ElementType(size_type i, T&& t): index(i), value(t) {} ElementType(size_type i): index(i) {} ElementType(ElementType const&) = default; size_type index; value_type value; }; typedef vector<ElementType> array_type; public: typedef T* pointer; typedef T& reference; typedef const T& const_reference; private: size_type size_; mutable typename array_type::size_type sorted_filled_; mutable array_type data_; // lots of code for various algorithms... public: class sparse_iterator : public boost::iterator_adaptor< sparse_iterator // Derived , array_type::iterator // Base (the internal array) (this paramater does not compile! -- says expected a type, got 'std::vector::iterator'???) , boost::use_default // Value , boost::random_access_traversal_tag? // CategoryOrTraversal > class iterator_proxy { ??? }; class iterator : public boost::iterator_facade< iterator // Derived , ????? // Base , ????? // Value , boost::?????? // CategoryOrTraversal > { }; };

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  • When are child views added to Layout/ViewGroup from XML

    - by JohnTube
    My question is : I want to know when does a xLayout (or ViewGroup in general) add a child view from XML ? And by "when" I mean at what point of code, in what "pass" of the "traversal" of the UI toolkit ? Which method of xLayout or ViewGroup should I override ? I have done my homework : I have watched the "Writing Custom Views For Android" presented (by Adam Powell and Romain Guy) in the last Google I/O and I have read Adam Powell comments on this Google+ post.

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  • Maintaing list order in binary tree.

    - by TheBigO
    Given a sequence of numbers, I want to insert the numbers into a balanced binary tree such that when I do a preorder traversal on the tree, it gives me the sequence back. How can I construct the insert method corresponding to this requirement? Remember that the tree must be balanced, so there isn't a completely trivial solution. I was trying to do this with a modified version of an AVL tree, but I'm not sure if this can work out.

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  • PayPal IPN & ASP.NET MVC

    - by Wayne
    Hello - I have a strange problem that somebody can hopefully help me with. For a while now I have been using PayPal's IPN service for our website. In order to test it I have a port opened up on our firewall pointing to my machine. This has been working great with no problems at all. I recently upgraded to the RTM release of ASP.NET MVC and now things are not working. I can navigate to my IPN handler from the outside world so I know it's not my connection or a firewall issue. It simply refuses to recieve any PayPal IPN messages. I am puzzled why the page can be accessed yet the PayPal IPN server wont connect to it. I realize there could be a 1000 different reasons for this, but I am hoping somebody out there can point me in the right direction!

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  • Is it possible to do have Capistrano do a checkout over a reverse SSH tunnel?

    - by James A. Rosen
    I am developing an application that resides on a public host but whose source I must keep in a Git repository behind a corporate firewall. I'm getting very tired of the slowness of deploying via scp (copying the whole repository and shipping it over SSH on each deploy) and would like to have the remote host simply do a git pull to update. The problem is that the firewall prohibits incoming SSH connections. Would it be possible for me to set up an SSH tunnel from my computer to the deployment computer and use my repository as the source for the git pull? After all, git is distributed, so my copy is just as valid a repository as the central one. If this is possible, what would the tunnel command and the Capistrano configuration be? I think the tunnel will look something like ssh -R something:deployserver.com:something [email protected]

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  • Removing elements from C++ std::vector

    - by user219847
    What is the proper way to remove elements from a C++ vector while iterating through it? I am iterating over an array and want to remove some elements that match a certain condition. I've been told that it's a bad thing to modify it during traversal.

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  • Is there a way to make PHP's SplHeap recalculate? (aka: add up-heap to SplHeap?)

    - by md2k7
    I am using an SplHeap to hold graph nodes of a tree with directed edges that will be traversed from the leaves to the root. For this, I precalculate the "fan-in" of nodes and put them into the heap so that I can always retrieve the node with the smallest fan-in (0) from it. After visiting a node, I reduce the fan-in of its successor by 1. Then obviously, the heap needs to be recalculated because the successor is now in the wrong place there. I have tried recoverFromCorruption(), but it doesn't do anything and keeps the heap in the wrong order (node with larger fanIn stays in front of smaller fanIn). As a workaround, I'm now creating a new heap after each visit, amounting to a full O(N*log(N)) sort each time. It should be possible, however, to make up-heap operations on the changed heap entry until it's in the right position in O(log(N)). The API for SplHeap doesn't mention an up-heap (or deletion of an arbitrary element - it could then be re-added). Can I somehow derive a class from SplHeap to do this or do I have to create a pure PHP heap from scratch? EDIT: Code example: class VoteGraph { private $nodes = array(); private function calculateFanIn() { /* ... */ } // ... private function calculateWeights() { $this->calculateFanIn(); $fnodes = new GraphNodeHeap(); // heap by fan-in ascending (leaves are first) foreach($this->nodes as $n) { // omitted: filter loops $fnodes->insert($n); } // traversal from leaves to root while($fnodes->valid()) { $node = $fnodes->extract(); // fetch a leaf from the heap $successor = $this->nodes[$node->successor]; // omitted: actual job of traversal $successor->fanIn--; // will need to fix heap (sift up successor) because of this //$fnodes->recoverFromCorruption(); // doesn't work for what I want // workaround: rebuild $fnodes from scratch $fixedHeap = new GraphNodeHeap(); foreach($fnodes as $e) $fixedHeap->insert($e); $fnodes = $fixedHeap; } } } class GraphNodeHeap extends SplHeap { public function compare($a, $b) { if($a->fanIn === $b->fanIn) return 0; else return $a->fanIn < $b->fanIn ? 1 : -1; } }

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  • Is this safe on a production server?

    - by Camran
    I have a database application (or search engine) which is called Solr. I connect to it via port 8983. I do this from php code, so I add and remove records from it via php. On my server I have a firewall. I have set this firewall to only allow connections to and from this port (8983) from the ip adress of my own server. In other words, only allow servers IP to access this port. Is that safe? Or am I thinking all wrong here? Will others be able to "simulate" my ip adress and act as the server? This is because otherwise others may add/remove records as they want from their own ip adresses... Thanks

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  • Cross domain XMLHttpRequest in classic ASP

    - by HahaHehe
    My code is working fine till i migrate it to another server with firewall. After since, some part of my code is not working. Its seem to be the xmlhttp POST problem. Can someone point me to the right direction and how to determine if the firewall is the problem. My client insisted to me to use classic asp, so i cannot upgrade to .net. Dim objHttp SUBMIT_URL = "http://www.abc.com/confirm.asp" Call Process() Public Sub Process() set objHttp = Server.CreateObject("Microsoft.XMLHTTP") 'set the timeout values in milliseconds lResolve = 1 * 1000 lConnect = 1 * 1000 lSend = 2 * 1000 lReceive = 2 * 1000 objHttp.open "POST", SUBMIT_URL, false objHttp.setRequestHeader "Content-type", "application/x-www-form-urlencoded" objHttp.Send str if err.number <> 0 then Response.Write "Error : " & err.Description err.Clear end if End Sub

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  • Windows Server 2003 RDP not listening on IPv6

    - by Ian Boyd
    i have a Windows Server 2003 machine; with IPv6 enabled: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : newland.local IP Address. . . . . . . . . . . . : 192.168.1.244 Subnet Mask . . . . . . . . . . . : 255.255.0.0 IP Address. . . . . . . . . . . . : 2001:470:¦¦¦¦:¦¦¦¦:¦¦¦:¦¦¦¦:¦¦¦¦:¦¦¦¦ IP Address. . . . . . . . . . . . : fe80::224:1dff:fe86:fdf2%4 Default Gateway . . . . . . . . . : 192.168.1.1 fe80::250:bfff:fe91:955f%4 i can connect to IIS server using IPv, remotely and locally, using IPv4 and IPv6: > telnet 127.0.0.1 80 (connects) > telnet 192.168.1.244 80 (connects) > telnet ::1 80 (connects) > telnet fe80::224:1dff:fe86:fdf2 80 (connects) And TCPView shows that the server is listening on port 80: Note: This is useful to establish that Windows Server 2003 does have support for IPv6 services. And i can connect to terminal services, locally and remotely, using IPv4: > telnet 127.0.0.1 3389 (connects) > telnet 192.168.1.244 3389 (connects) But i cannot connect to RDP, locally or remotely, over IPv6: > telnet ::1 3389 (fails to connect) > telnet fe80::224:1dff:fe86:fdf2 3389 (fails to connect) We can see that the system is listening on 3389: Except why won't it listen on port 3389 (ipv6)? Unfortunately it's not the firewall. Aside from the fact that i'm connecting locally (in which case the firewall doesn't apply), the firewall doesn't apply:

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  • NFS Mounts Issues

    - by user554005
    Having some issue with a NFS Setup on the clients it just times out refuses to connect [root@host9 ~]# mount 192.168.0.17:/home/export /mnt/export mount: mount to NFS server '192.168.0.17' failed: timed out (retrying). mount: mount to NFS server '192.168.0.17' failed: timed out (retrying). mount: mount to NFS server '192.168.0.17' failed: timed out (retrying). mount: mount to NFS server '192.168.0.17' failed: timed out (retrying). Here are the settings I'm using: [root@host17 /home/export]# cat /etc/hosts.allow # # hosts.allow This file contains access rules which are used to # allow or deny connections to network services that # either use the tcp_wrappers library or that have been # started through a tcp_wrappers-enabled xinetd. # # See 'man 5 hosts_options' and 'man 5 hosts_access' # for information on rule syntax. # See 'man tcpd' for information on tcp_wrappers # portmap: 192.168.0.0/255.255.255.0 lockd: 192.168.0.0/255.255.255.0 rquotad: 192.168.0.0/255.255.255.0 mountd: 192.168.0.0/255.255.255.0 statd: 192.168.0.0/255.255.255.0 [root@host17 /home/export]# cat /etc/hosts.deny # # hosts.deny This file contains access rules which are used to # deny connections to network services that either use # the tcp_wrappers library or that have been # started through a tcp_wrappers-enabled xinetd. # # The rules in this file can also be set up in # /etc/hosts.allow with a 'deny' option instead. # # See 'man 5 hosts_options' and 'man 5 hosts_access' # for information on rule syntax. # See 'man tcpd' for information on tcp_wrappers # portmap:ALL lockd:ALL mountd:ALL rquotad:ALL statd:ALL [root@host17 /home/export]# cat /etc/exports /home/export 192.168.0.0/255.255.255.0(rw) [root@host17 /home/export]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain RH-Firewall-1-INPUT (2 references) target prot opt source destination ACCEPT all -- anywhere anywhere ACCEPT icmp -- anywhere anywhere icmp any ACCEPT esp -- anywhere anywhere ACCEPT ah -- anywhere anywhere ACCEPT udp -- anywhere 224.0.0.251 udp dpt:mdns ACCEPT udp -- anywhere anywhere udp dpt:ipp ACCEPT tcp -- anywhere anywhere tcp dpt:ipp ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:http ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:https ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:6379 ACCEPT udp -- 192.168.0.0/24 anywhere state NEW udp dpt:sunrpc ACCEPT tcp -- 192.168.0.0/24 anywhere state NEW tcp dpt:sunrpc ACCEPT tcp -- 192.168.0.0/24 anywhere state NEW tcp dpt:nfs ACCEPT tcp -- 192.168.0.0/24 anywhere state NEW tcp dpt:32803 ACCEPT udp -- 192.168.0.0/24 anywhere state NEW udp dpt:filenet-rpc ACCEPT tcp -- 192.168.0.0/24 anywhere state NEW tcp dpt:892 ACCEPT udp -- 192.168.0.0/24 anywhere state NEW udp dpt:892 ACCEPT tcp -- 192.168.0.0/24 anywhere state NEW tcp dpt:rquotad ACCEPT udp -- 192.168.0.0/24 anywhere state NEW udp dpt:rquotad ACCEPT tcp -- 192.168.0.0/24 anywhere state NEW tcp dpt:pftp ACCEPT udp -- 192.168.0.0/24 anywhere state NEW udp dpt:pftp REJECT all -- anywhere anywhere reject-with icmp-host-prohibited on the clients here is some rpcinfos [root@host9 ~]# rpcinfo -p 192.168.0.17 program vers proto port 100000 4 tcp 111 portmapper 100000 3 tcp 111 portmapper 100000 2 tcp 111 portmapper 100000 4 udp 111 portmapper 100000 3 udp 111 portmapper 100000 2 udp 111 portmapper 100011 1 udp 875 rquotad 100011 2 udp 875 rquotad 100011 1 tcp 875 rquotad 100011 2 tcp 875 rquotad 100005 1 udp 45857 mountd 100005 1 tcp 55772 mountd 100005 2 udp 34021 mountd 100005 2 tcp 59542 mountd 100005 3 udp 60930 mountd 100005 3 tcp 53086 mountd 100003 2 udp 2049 nfs 100003 3 udp 2049 nfs 100003 4 udp 2049 nfs 100227 2 udp 2049 nfs_acl 100227 3 udp 2049 nfs_acl 100003 2 tcp 2049 nfs 100003 3 tcp 2049 nfs 100003 4 tcp 2049 nfs 100227 2 tcp 2049 nfs_acl 100227 3 tcp 2049 nfs_acl 100021 1 udp 59832 nlockmgr 100021 3 udp 59832 nlockmgr 100021 4 udp 59832 nlockmgr 100021 1 tcp 36140 nlockmgr 100021 3 tcp 36140 nlockmgr 100021 4 tcp 36140 nlockmgr 100024 1 udp 46494 status 100024 1 tcp 49672 status [root@host9 ~]# [root@host9 ~]# rpcinfo -u 192.168.0.17 nfs rpcinfo: RPC: Timed out program 100003 version 0 is not available [root@host9 ~]# rpcinfo -u 192.168.0.17 portmap program 100000 version 2 ready and waiting program 100000 version 3 ready and waiting program 100000 version 4 ready and waiting [root@host9 ~]# rpcinfo -u 192.168.0.17 mount rpcinfo: RPC: Timed out program 100005 version 0 is not available [root@host9 ~]# I'm running CentOS 5.8 on all systems

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