I need some advices...

I develop a search-engine, and now I must develop a database that can upgrade itself(some kind of spider?). I don't know how to do that. I don't need a program-source, just some advices. Can you help me?
Thank you in advance,

That sounds quite complicated. Anyhow, I would first have a look at the following classes:

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  • Business Delegate pattern - need some advice

    Hi. First let me apologize for the long post. I could see no other way. I�m building a system that quite large and I need some advice. The system is a type of transaction system, let�s suppose a shopping cart. I�m using struts taglibs and tiles for presentation, struts proper for controller, and POJOs for business logic. Also I�m using OJB for my data tier.
    Now I�ve been reading Pro Jakarta Struts (Apress), which BTW is a recommended read to anyone with novice experience in struts and related technologies. I�ve assimilated most of the techniques and patterns described in the book, and most of them make sense to me. However, I�ve hit a snag while reading the Business Delegate and Service Locator patterns.
    The way I had though of building my application before reading the book, was to have a wrapper class, such as the following:
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      private IAuthenticationService authenticationService;
      private ITransactionService transactionService;
      public ShoppingCart() {
         authenticationService = new DBAuthenticationService();
         authenticationService = new DBTransactionService();
      public login(String username, String password) {
         String sessionToken = authenticationService.logon(username, password);
         return sessionToken;
      private boolean isValidUser(sessionToken) {
         bolean validUser =  authenticationService.isValidUser(sessionToken);
         return validUser;
      public performTransaction(sessionToken, TransactionVO) {
         if (!isValidUser(sessionToken) {
              throw new AuthenticationException();
      public editPreferences(sessionToken, PreferencesVO) {
         if (!isValidUser(sessionToken) {
              throw new AuthenticationException();
    }My idea was that my wrapper class would isolate all the business logic and could perform login service in case my application was ever to be used with other presentation layer than struts (standalone client, web services). However I believe that this overlaps the Business Delegate pattern and maybe even totally implements it. The way I understand the code I�m reading in the book, they suggest having a BD for each major service such as AuthenticationServiceBD, TransactionServiceBD, etc� However this would break my single point of entry for authenticating users. I really need some advice on my design and how it fits with the BD and SL patterns (or others). I would also like to know what you think/recommend of my authentication strategy.
    thanks in advance

    Thanks for your reply. This however, I understood. My concern is regarding my application in regards to business delegate pattern. You see I have this class (simplified for clarity):
    public class ShoppingCart {
       private ILoginService ls = new DBLoginService();
       private ITransactionService ts = new DBTransService();
       // and so on for all services I offer.
       //  then I mirror all the calls of my private interfaces
       //  and pass them through internally
       public String sessionToken login(String username, String password) {
            ls.login(username, password);
       public boolean addToCart(sessionToken, itemNo) {
            // check session
            ts.addToCart(sessionToken, itemNo);
       //  and so on
    }Multiple questions for this one:
    1) Am I not already implementing the Business Delegate pattern with my ShoppingCart class since all interfaces are private and all calls are mirrored from the wrapper class (ShoppingCart) to the private interfaces? All services are implemented as POJOs and I am not using JNDI at the present so I don't use the ServiceLocator pattern.
    2) I store a reference to the wrapper class (ShoppingCart) in the ServletContext so I can grab it from my Action classes. What do you think of this approach?
    3) How many BDs should an application contain. In my case I use just one. What is the advantage of using more?
    4) I create my own session tokens in case I ever want to use to business code in a non-web applications where sessions are not available readily. This brings about the problem that I can't pass the interfaces directly to the Action classes because the login session needs to be checked before any calls to services. So all methods include a sessionToken parameter which I use to check the session. This way, if I want to expose some of the services through web services, I can still use a login. What do you think of this approach.
    5) Any other remarks are very welcome...
    I really need help with this from an experienced programmer. Most things I can handle on my own but with this type of design issue, books just don't cut it. I need experience. I would really apreciate some feedback.
    ps: I would give all my Duke dollars for this (I only have 30), but I'm not sure how. If you want them I can create a dummy question and give them to you.

  • I need some advice...

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    Enemy Territory is an excellent game, and it is totally free.
    I haven't played the free game from the US Army, but heard it is really good, and is totally free.
    I bought Return to Castle Wolfenstein, which plays perfectly in Single player mode, but I have some trouble in multiplayer mode (and I'm not an expert either).
    I bought Unreal Tournament 2004, which plays perfectly in both single player and online, but I simply suck at the game.
    I bought Never Winter Nights because I know the company has a linux version you can download once you have a registered copy.  I havent installed it yet, though, been playing UT2004.
    Doom3 is supposedly going to have a linux installer on the CD's, like UT2004 does.
    Anygame that uses OpenGL graphics instead of DirectX will prolly run under WINE or WINEX, or be easy for the original company to port (if they choose to).
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    Betweet RTCW, EnemyT, Never Winter Nights, UT2004, and soon Doom3 - I have enough games to play, and thats without buying winex.
    Fergettabout Windows! You simply don't need it anymore.
    If you are determined to run Windows, get a removeable drive bay, and just swap boot drives when you want to swtich.  Or use GRUB if you want to select from multiple OS's.

  • I need some advice about the macbook pro and iPhone 5. I took a video on my iPhone and tried to email it it said it was too big to send? So i downloaded it to my macbook pro and tried to mail it to no avail? The macbook tells me the server won't let it th

    I need some advice about the macbook pro and iPhone 5.
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    I agree with LowLister, the best option for you to share the video online is to upload it to your online storage account for example : Box, Dropbox, SkyDrive (All of them provide free storage beginning from 2GB).
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  • When I burn a disc from a playlist in iTunes, the track names and artist info does not display on the disc when friends view/listen to it. This probably is an easy fix, but I need some advice.

    When I burn a disc from a playlist in iTunes on my MacBook, the track names and artist info does not display on the disc when friends view/listen to it. This probably is an easy fix, but I need some advice.

    No, this standard has been implemented for several decades.
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  • Having some serious issues with my iPhone and need some advice

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    First: I've experienced the same problem with my iPhone 5. I've bought a new charger and it still did the same thing. I went to the Apple Store to get my iPhone checked out and they said that the pins inside my iPhone we're damaged, and I had to get a replacement.
    ~ Josh

  • Dell Live! Value Soundblater card!!!! Need some advice

    I have an old 400 that has this card installed model #CT4780. I have purchased a new Dell E30 and want to install this card in it. I have downloaded the driver pack <FONT face=Verdana color=#ff0000 size=3>Li'veDrvUni-Pack(ENG).exe. This<FONT face=Verdana color=#ff0000 size=3> was<FONT face=Verdana color=#ff0000 size=3> listed<FONT face=Verdana color=#ff0000 size=3> on<FONT face=Verdana color=#ff0000 size=3> the<FONT face=Verdana color=#ff0000 size=3> website<FONT face=Verdana color=#ff0000 size=3> as<FONT face=Verdana color=#ff0000 size=3><FONT face=Verdana color=#ff0000 size=3> the<FONT face=Verdana color=#ff0000 size=3> correct<FONT face=Verdana color=#ff0000 size=3> one<FONT face=Verdana color=#ff0000 size=3> for<FONT face=Verdana color=#ff0000 size=3> XP.<FONT face=Verdana color=#ff0000 size=3> I notice that in the old computer there is a cable from the card to the CD-Rom and also one from the card to the modem. Are these cables need in the new computer? Also will I have a conflict with the integrated sound card that came with the new computer? I have not done anything expect download the driver pack.
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    Newer operating systems, computers, & audio cards do not require the use of the cable from the CD Rom to the soundcard. It is now handled via the IDE cable. Being that you only upgraded half of this equation (that being the computer and not the soundcard), this may be a "trial & error" situation. I do not have the experience with modem cards to comment on that one.
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    Message Edited by johnston2 on 0-25-2006 06:49 PM

  • Songs disappearing. Need some advice.

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    miner78 wrote:
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    That's incorrect:
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  • I'm Back! Need some Advice! Rebuild time! 6/19 UPDATE! 2nd UPDATE 7/6/15

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    izzesparks wrote:
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Instead of buying a new car and making payments I bought a really good used gas-efficient car cash, paid in full. But since it’s still a newer car I am paying for full coverage insurance, my only splurge. I have spent this time away from this forum truly taking heed to the lessons I learned on here and reflecting on my situation. I have paid nearly everything off! It took some time but I only have 2 creditors left ‘that I know of’ to pay.One of the creditors has not reported to the bureaus yet but I want to take care of them before they do. Most of the ones I paid have already fallen off because of SOL. I was getting to the point I had the problem where I didn’t just have bad credit, I had NO credit. I hadn’t opened any new accounts until this year. Just today I opened a $500 Secured Personal loan and a few months ago I opened a $300 Secured Credit Card at my credit union. I also applied for a Quicksilver CapOne card and was approved for $300. 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I don't even have a checkbook, never have. A new creditor sending letters to me now (boy they sure are coming out of the woodworks, not that I have started paying everyone off) NOT reporting to CRA's yet, going to try to take care of this next week before it does. Sooooooooooo what should I do know????!!!! Thanks in advance for any advice given! 

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    Budget Range: ($1000-$1500) 
    System Usage from Most to Least Important: (Web Development, Graphic Design, Internet, Movies)) 
    Parts Not Required: (keyboard, mouse, monitor, speakers) 
    Preferred Website(s) for Parts: (newegg.com) 
    Country of Origin: (USA) 
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    Product Description
    Total Price
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    $20.00 Mail-in Rebate Card17-139-011
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    Microsoft Windows 7 Professional 64-bit 1-Pack for System Builders - OEM Item #: N82E16832116758Return Policy: Software Standard Return Policy
    -$10.00 Instant
    -$30.00 Combo
    Calculate ShippingZip Code:    13662   FedEx 3Day Express Saver -- $145.44FedEx 2Day -- $219.19FedEx Standard  Overnight -- $263.21UPS Guaranteed 3 Day Service -- $15.97UPS 2nd Day --  $127.74UPS Next Day Saver -- $135.95
    Redeem Newegg Gift CardsCard Number:                                          Security Code:
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    Here is the final config I am looking to get.  I am just debating the hard drive config and video cards.  I want to be sure my video card will use teh GPU Accelleration and Advance features of Photoshop CS5.  Do you know if the NVIDIA GTX 460 is compatable or should I spend more for the 470?  I will not be gaming much and this pc is used mostly for work on CS5 Web Premium.  How does this all look?  All prices from NewEgg. I have another machine I will backup sata to each evening, so I really want a fast drive for program load and operation and another drive for data.  What is best way to config drives?  Should I get 2 of them and an SSD?
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    Total Price
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    Return Policy: Standard Return Policy
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    Return Policy: Memory Standard Return Policy
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    Return Policy: Standard Return Policy
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    ASUS Sabertooth X58 ATX Intel Motherboard
    Item #: N82E16813131665
    Return Policy: Standard Return Policy
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    Item #: N82E16819115211
    Return Policy: CPU Replacement Only Return Policy
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    Item #: N82E16832116758
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  • Need some advices with OBIEE

    Hi guys,
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