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  • Enterprise Service Bus (ESB): Important architectural piece to a SOA or is it just vendor hype?

    Is an Enterprise Service Bus (ESB) an important architectural piece to a Service-Oriented Architecture (SOA), or is it just vendor hype in order to sell a particular product such as SOA-in-a-box? According to IBM.com, an ESB is a flexible connectivity infrastructure for integrating applications and services; it offers a flexible and manageable approach to service-oriented architecture implementation. With this being said, it is my personal belief that ESBs are an important architectural piece to any SOA. Additionally, generic design patterns have been created around the integration of web services in to ESB regardless of any vendor. ESB design patterns, according to Philip Hartman, can be classified in to the following categories: Interaction Patterns: Enable service interaction points to send and/or receive messages from the bus Mediation Patterns: Enable the altering of message exchanges Deployment Patterns: Support solution deployment into a federated infrastructure Examples of Interaction Patterns: One-Way Message Synchronous Interaction Asynchronous Interaction Asynchronous Interaction with Timeout Asynchronous Interaction with a Notification Timer One Request, Multiple Responses One Request, One of Two Possible Responses One Request, a Mandatory Response, and an Optional Response Partial Processing Multiple Application Interactions Benefits of the Mediation Pattern: Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently Design an intermediary to decouple many peers Promote the many-to-many relationships between interacting peers to “full object status” Examples of Interaction Patterns: Global ESB: Services share a single namespace and all service providers are visible to every service requester across an entire network Directly Connected ESB: Global service registry that enables independent ESB installations to be visible Brokered ESB: Bridges services that are reluctant to expose requesters or providers to ESBs in other domains Federated ESB: Service consumers and providers connect to the master or to a dependent ESB to access services throughout the network References: Mediator Design Pattern. (2011). Retrieved 2011, from SourceMaking.com: http://sourcemaking.com/design_patterns/mediator Hartman, P. (2006, 24 1). ESB Patterns that "Click". Retrieved 2011, from The Art and Science of Being an IT Architect: http://artsciita.blogspot.com/2006/01/esb-patterns-that-click.html IBM. (2011). WebSphere DataPower XC10 Appliance Version 2.0. Retrieved 2011, from IBM.com: http://publib.boulder.ibm.com/infocenter/wdpxc/v2r0/index.jsp?topic=%2Fcom.ibm.websphere.help.glossary.doc%2Ftopics%2Fglossary.html Oracle. (2005). 12 Interaction Patterns. Retrieved 2011, from Oracle® BPEL Process Manager Developer's Guide: http://docs.oracle.com/cd/B31017_01/integrate.1013/b28981/interact.htm#BABHHEHD

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  • What Counts for a DBA: Passion

    - by drsql
    One of my first questions, when interviewing for a DBA/Programmer position, is always: “Why do you want this job?” The answers I receive range from cheesy hyperbole (“I want to enhance your services with my vast knowledge”) to deadpan realism (“I have N kids who all have a hole in the front of their face where food goes"). Both answers are fine in their own way, at least displaying some self-confidence, humour and honesty, but once in a while, I'll hear the answer that is music to me ears... “I LOVE DATABASES!” Whenever I hear it, my nerves tingle in hopeful anticipation; have I found someone for whom working with database isn't just a job, but a passion? Inevitably, I'm often disappointed. What initially seemed like passion turns out to be rather shallow enthusiasm; the person is enthusiastic about working with databases in the same way he or she might be about eating a bag of Cajun spiced kettle chips; enjoyable, but not something to think about too deeply or take too seriously. Enthusiasm comes, and enthusiasm goes. I've seen countless technical forum users burst onto the scene in a blaze of frantic question-answering, only to fade away within days, never to be heard from again. Passion, however, is more of a longstanding commitment. The biographies of the great technologists and authors of the recent past are full of the sort of passion and engrossment that lead a person to write a novel non-stop for a fortnight with no sleep and only dog food to eat (Philip K. Dick), or refuse to leave the works of the first tunnel under the Thames, even though it was flooded (Brunel). In a similar (though more modest) way, my passion for working with databases has led me to acts that might cause someone for whom it was "just a job" to roll their eyes in disbelief. Most evenings you're more likely to find me reading a database book than watching TV. I've spent hundreds of hours of my spare time writing blogs and articles (some of which are only read by tens of people); I've spent hundreds of dollars travelling to conferences, paying my own flight and hotel expenses, so that I can share a little of what I know, and mix with some like-minded people. And I know I'm far from alone in this, in the SQL Server community. Passion isn't everything, of course, and it isn't always accompanied by any great skill, but in almost every case, that skill can be cultivated over time. If you are doing what you are passionate about, work turns into more than just a way to feed your kids; it becomes your hobby, entertainment, and preoccupation. And it is this passion that gives a DBA the obsessive stubbornness, the refusal to be beaten by even the most difficult problem, which is often so crucial. A final word of warning though: passion without limits can turn weird. Never let it get in the way of your wife, kids, bills, or personal hygiene.

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  • custom tabbars and make them circulate

    - by pengwang
    i want to custom tabbars and want to circulate slide,default tab bar only have 5 items show at the same time,it not meet me,i have 11 items,so i want to make 3 tabbars ,every have 5 items,for example A(0-4)--B(5-9)--C(10)--A--B--C--A. at print i only finish A(0-4)--B(5-9)--C(10),how to make them circulate? my code : .h file #import <UIKit/UIKit.h> @protocol InfiniTabBarDelegate; @interface InfiniTabBar : UIScrollView <UIScrollViewDelegate, UITabBarDelegate> { __weak id <InfiniTabBarDelegate> infiniTabBarDelegate; NSMutableArray *tabBars; UITabBar *aTabBar; UITabBar *bTabBar; } @property (nonatomic, weak) id infiniTabBarDelegate; @property (strong,nonatomic) NSMutableArray *tabBars; @property (strong,nonatomic) UITabBar *aTabBar; @property (strong,nonatomic) UITabBar *bTabBar; - (id)initWithItems:(NSArray *)items; - (void)setBounces:(BOOL)bounces; // Don't set more items than initially - (void)setItems:(NSArray *)items animated:(BOOL)animated; - (int)currentTabBarTag; - (int)selectedItemTag; - (BOOL)scrollToTabBarWithTag:(int)tag animated:(BOOL)animated; - (BOOL)selectItemWithTag:(int)tag; @end @protocol InfiniTabBarDelegate <NSObject> - (void)infiniTabBar:(InfiniTabBar *)tabBar didScrollToTabBarWithTag:(int)tag; - (void)infiniTabBar:(InfiniTabBar *)tabBar didSelectItemWithTag:(int)tag; @end .m file @implementation InfiniTabBar @synthesize infiniTabBarDelegate; @synthesize tabBars; @synthesize aTabBar; @synthesize bTabBar; - (id)initWithItems:(NSArray *)items { self = [super initWithFrame:CGRectMake(0.0, 411.0, 320.0, 49.0)]; // TODO: //self = [super initWithFrame:CGRectMake(self.superview.frame.origin.x + self.superview.frame.size.width - 320.0, self.superview.frame.origin.y + self.superview.frame.size.height - 49.0, 320.0, 49.0)]; // Doesn't work. self is nil at this point. if (self) { self.pagingEnabled = YES; self.delegate = self; self.tabBars = [[NSMutableArray alloc] init]; float x = 0.0; for (double d = 0; d < ceil(items.count / 5.0); d ++) { UITabBar *tabBar = [[UITabBar alloc] initWithFrame:CGRectMake(x, 0.0, 320.0, 49.0)]; tabBar.delegate = self; int len = 0; for (int i = d * 5; i < d * 5 + 5; i ++) if (i < items.count) len ++; tabBar.items = [items objectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(d * 5, len)]]; // NSLog(@"####%@",NSMakeRange(d * 5, len)); [self.tabBars addObject:tabBar]; [self addSubview:tabBar]; x += 320.0; } self.contentSize = CGSizeMake(x, 49.0); } return self; } - (void)setBounces:(BOOL)bounces { if (bounces) { int count = self.tabBars.count; if (count > 0) { if (self.aTabBar == nil) self.aTabBar = [[UITabBar alloc] initWithFrame:CGRectMake(-320.0, 0.0, 320.0, 49.0)]; [self addSubview:self.aTabBar]; if (self.bTabBar == nil) self.bTabBar = [[UITabBar alloc] initWithFrame:CGRectMake(count * 320.0, 0.0, 320.0, 49.0)]; [self addSubview:self.bTabBar]; } } else { [self.aTabBar removeFromSuperview]; [self.bTabBar removeFromSuperview]; } [super setBounces:bounces]; } - (void)setItems:(NSArray *)items animated:(BOOL)animated { for (UITabBar *tabBar in self.tabBars) { int len = 0; for (int i = [self.tabBars indexOfObject:tabBar] * 5; i < [self.tabBars indexOfObject:tabBar] * 5 + 5; i ++) if (i < items.count) len ++; [tabBar setItems:[items objectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange([self.tabBars indexOfObject:tabBar] * 5, len)]] animated:animated]; } self.contentSize = CGSizeMake(ceil(items.count / 5.0) * 320.0, 49.0); } - (int)currentTabBarTag { return self.contentOffset.x / 320.0; } - (int)selectedItemTag { for (UITabBar *tabBar in self.tabBars) if (tabBar.selectedItem != nil) return tabBar.selectedItem.tag; // No item selected return 0; } - (BOOL)scrollToTabBarWithTag:(int)tag animated:(BOOL)animated { for (UITabBar *tabBar in self.tabBars) if ([self.tabBars indexOfObject:tabBar] == tag) { UITabBar *tabBar = [self.tabBars objectAtIndex:tag]; [self scrollRectToVisible:tabBar.frame animated:animated]; if (animated == NO) [self scrollViewDidEndDecelerating:self]; return YES; } return NO; } - (BOOL)selectItemWithTag:(int)tag { for (UITabBar *tabBar in self.tabBars) for (UITabBarItem *item in tabBar.items) if (item.tag == tag) { tabBar.selectedItem = item; [self tabBar:tabBar didSelectItem:item]; return YES; } return NO; } - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { [infiniTabBarDelegate infiniTabBar:self didScrollToTabBarWithTag:scrollView.contentOffset.x / 320.0]; } - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView { [self scrollViewDidEndDecelerating:scrollView]; } - (void)tabBar:(UITabBar *)cTabBar didSelectItem:(UITabBarItem *)item { // Act like a single tab bar for (UITabBar *tabBar in self.tabBars) if (tabBar != cTabBar) tabBar.selectedItem = nil; [infiniTabBarDelegate infiniTabBar:self didSelectItemWithTag:item.tag]; } @end

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  • Intermittent loss of internet connectivity with good wireless signal

    - by rsheart
    I recently bought a HP touch smart running windows 7. At random times, internet connectivity is lost while the wireless signal remains strong. The only way to restore connectivity is to restart the PC. Nothing else works. Have many other PC's on the same router also running windows 7 and no problems there. Have changed routers and problem remains. I have reinstalled the network drivers with no help. Any thoughts?

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  • Useful extensions for MediaWiki

    - by Stan
    Can anyone suggestion some useful MediaWiki extension? I've installed PDF export, syntax lighlight, file link protocol, submit in toolbar, enforce strong password. But still eager to know any good/handy extensions. Thanks

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  • iso is already present on server

    - by andygriff
    Hi, I'm using SCVMM R2 with Windows 2008 R2 hosts. I've noticed that if I have an iso mounted on a vm from the scvmm library and then a snapshot is restored then you always get an error .iso is already present on server when trying add it again. I know you can log onto the Host and delete the iso from the Virtual Machine foler but that will be a nigthmare in a 200 VM strong implimentation. is there another way?

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  • Recommendations for Windows Server 2008 Hyper-V VPS Host?

    - by user37042
    I'm looking for a well-respected, high-performing Windows Server 2008 Hyper-V VPS host. For my linux hosting, I use a shared WebFaction account, so I'm spoiled by their incredible service and support. RackSpaceCloud also sounds really good, especially for linux hosting, but it sounds like their Windows hosting is just getting off the ground. I've heard good things about SoftSysHosting, but I didn't know if there were any other VPS providers out there that people will give strong endorsements for (as I do for WebFaction every chance I get).

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  • Utility to Monitor Kill / Restart Rogue Process?

    - by Sean O
    Hi, I need a Windows (XP/7) utility to continuously monitor always-running processes and kill them (and optionally restart them) if they hang. There are a lot of interactive tools out there (Sysinternals, most notably). But I have a program on a little-used workstation that needs to run continuously and reliably, both of which are not two of its strong suits :) It requires continual babysitting, and I'd rather just have a monitoring utility (even a paid one) that can kill/restart it on definable conditions -- e.g. CPU 80%, Status of "Not Responding", etc.

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  • Win 7 Wireless Connected With Good Signal But No Internet Access

    - by c00lryguy
    In Windows 7 I was connected wirelessly for about a week when one day I came home and the wireless was connected with a strong signal but it said that I had "No Internet Access" It's been 3 days since then now and I have yet to find a way to fix it. My wireless drivers are right off the disk that came with the wireless card. Can anyone help me? My problem is similar to these: http://forums.cnet.com/5208-7589_102-0.html?threadID=120346 http://social.answers.microsoft.com/Forums/en-US/w7network/thread/90841fe7-c910-424b-82d7-48be7ef69f39

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  • Getting an alert when my oracle database goes up or down

    - by CodeSlave
    How can I get an e-mail alert when my oracle database comes up or down? I have a database that I need to know when it goes down (it would be nice to know if it has come back up), preferably from a remote machine. Conceivably I could hack together something that TNSPings my DB and e-mails me when that changes, but I'm hoping there's a free package out there. Something that would run on windows. Any strong recommendations?

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  • Macbook pro 1,1 wifi problems

    - by Giulio
    I have a macbook pro 1,1 that has problems with the wifi: i have a strong wireless router that reaches the far side of my house, but with my macbook pro, i have to stay within 1 meter away from the router to have internet connection. if i step out of that range, i lose connection. now, my questions are: 1)what the hell i going on 2) is there a way to fix this?

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  • .htaccess: Transparently adding a name to the request

    - by Jon
    I've read this tutorial about how to modify your .htaccess in order to server many web2py applications but it doesn't seem to work. Here is my .htaccess RewriteEngine On RewriteRule ^dispatch\.fcgi/ - [L] RewriteRule ^(.*)$ dispatch.fcgi/$1 [L] RewriteCond %{HTTP_HOST} =www.moublemouble.com [NC, OR] RewriteCond %{HTTP_HOST} =moublemouble.com [NC] RewriteRule ^/(.*) /moublemouble/$1 [PT,L] All I get is a 500 Internal Error and .htaccess is not my strong point. Any clues?

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  • Small business: what should I know about computer security?

    - by geschema
    I run a small (1 man) consulting company in the field of embedded systems, working from home using a standard DSL internet access. My main development machine is a Windows XP PC, which is connected to the router with an ethernet cable. I also have a MacBook Pro laptop, which is connects to the network via WLAN (WPA-PSK). Besides enabling the Windows firewall, not using IE, having an up-to-date antivirus program and strong passwords, what do I need to know to keep my customers' data safe on these computers?

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  • Where to find a list of bad passwords?

    - by Steve Morgan
    I need to implement a 'stop list' to prevent users selecting common passwords in a new online service. Can anyone point me to such a list online anywhere? Edited: Note that I'm only trying to eliminate the most common passwords, not an exhaustive dictionary. And, of course, this complements a reasonably strong password policy (length, use of non-alpha characters, etc.) Thanks.

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  • WiFi signal is lost every 3 minutes

    - by Software Monkey
    For several weeks now my Android phone has been losing it's WiFi signal momentarily, typically at about 3 minute intervals (about 3 minutes, 1.5 seconds) and occasionally at some longer interval that always seems to be just over 3 minutes. This causes an interruption of several seconds while the WiFi connection is re-established and typically fails any kind of download/streaming that is happening, makes web sites "unreachable" and generally makes the phone unusable as a data device due to the frequency. The signal remains down for about a second, but the phone takes a few more seconds to reconnect to the router. This happens regardless of proximity to the router, which otherwise show a very strong signal - usually -40 to -30 dBm or better in the same room, nowhere less than 060 dBm anywhere in the house. Changing channels does not help (I've tried 1, 4, 8 and 9). Nor does turning off the router's guest access. Nor does turning off the 5.0 GHz band. Monitoring the signal on my phone with WiFi analyzer, shows all WiFi signals on all channels drop to nothing when the WiFi connection is lost (there are two other networks on different channels which are strong enough to be relevant, with about 6 others constantly fading in and out). WiFi analyzer shows 3 separate signals for my router, the main 2.4 GHz, the guest 2.4 GHz and the 5.0 GHz. Using WiFi Analyzer on my wife's phone side-by-side shows no change in signal when my phone drops, nor does her phone drop. Monitoring the signal using our laptop, side-by-side likewise shows no signal loss and likewise the laptop does not lose it's WiFi connection. But, at work, the phone seems to not exhibit the same behavior, or, if it does, it's very occasional. Monitoring it all day at work I only saw the signal drop 3 or 4 times. The signal strength of the various networks there is comparatively weak. AT&T were super helpful: "Sorry, we can't help you with WiFi problems. You could try doing a factory reset on your phone". </sarcasm The router is relatively new, but has been working fine with this phone since last Dec. Phone : Motorola Atrix (about 8 months old). Router : Belkin N750 DB (F9K1103 v1 (01C)). Router Firmware: 1.00.46 (2011/10/28 6:37:11). Security : WPA/WPA2-Personal (PSK)

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  • Free or very Cheap VPN server software with high concurrent users count

    - by Martin KS
    I'm hoping to implement a VPN whereby about 200 concurrent users can log in to briefly access my network. I had a look at OpenVPN and this seemed excellent, but was hoping that there would be a less costly option on a per-concurrent-user basis. I've no need for particularly strong security, and my only other requirement is that I would need to be able to add users in bulk via csv or similar. Does anyone have any suggestions?

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  • Is CSF overkill?

    - by A4J
    My server runs just my own sites (vBulletin forums - which are always patched with security fixes) and Rails sites using the latest version) so do I really need CSF? (http://configserver.com/cp/csf.html) Or is it unnecessary for this kind of server set-up? I have already done the usual (disable SSH login, pub-key auth, very strong passwords everywhere else etc) It was often recommended by users over at the cPanel forums - but I guess most of them are hosts there.

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  • Computer class or home teaching for kids?

    - by JMarsch
    I want to teach my son to be a strong PC user. I could try to strike out on my own for this, but I was wondering if there is a good online (or book based) course for this. Like most kids, he's proficient with Google, YouTube, and Minecraft, but he's very curious, and I would like to teach him more. Even some basic excercises, like working with the file system would be good for him (i would need some help to not make it boring).

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  • Wifi interference tool for Mac

    - by Kevin Burke
    This Server Fault blog post shows some tools you can use to view interference on your wireless network: blog.serverfault.com/2012/01/05/a-studied-approach-at-wifi-part-2/. They mention Vistumbler, which only works on PC's. Is there a similar tool I can use to measure wireless interference on a Mac? Also, is it better to be on a channel with many AP's, each with a weak signal, or on a channel with only a few AP's, but a strong signal?

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  • Program to set time on local computer using GPS data

    - by dmkerr
    I have a laptop running Windows XP that does not connect to the Internet and I would like to use a USB GPS receiver as a time source to set the clock. Generally, the laptop will not have access to the open sky so getting a strong, multi-satellite connection is not likely. Ideally, I would like to be able to have the program detect the GPS receiver and set the clock without intervention from the user. Is what I'm seeking even feasible?

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  • Which server would you purchase? IBM x3550 or Dell R610?

    - by Harry
    I'm in the market for a single unit rack mounted server with a strong upgrade pathway. The two servers on the top of my wish list are: IBM x3550 M2 Express Followed by Dell R610 Ultimately I want to have a Dual Quad Xeon (2 Ghz+) server with loads of RAM for a top notch DB server. The database is likely to keep growing indefinitly so a snappy Raid 5 array of Harddrives will be essential. Which would you purchase?

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  • AD reset user passwords for a security group

    - by Nathan C
    I'm not quite sure if this is possible or not, but I need to force a certain security group's users to have their passwords expire so they'll be forced to change them on next login. The reason for this is because I applied a FGPP (password policy) to this particular group in order to enforce strong passwords. Well, many users have really weak passwords and they won't be changed unless they're forced. Is there a way to do this without forcing everyone to a single password?

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