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18Nov/090

Canada Viagra Pharmacies Scam

Canada viagra pharmacies scam In my few days of being a developer, canada viagra pharmacies scam I’ve heard and seen lots of talk about Singletons.  Things like

Canada viagra pharmacies scam Singletons are teh suck.  Don’t use them.  EVAR.

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Canada viagra pharmacies scam Singleton’s saved my life and marriage!

Canada viagra pharmacies scam In fact, canada viagra pharmacies scam I might’ve been the person that said both of these… gasp!

Canada viagra pharmacies scam I never like to speak in absolutes, canada viagra pharmacies scam so I’ll say it this way (see what I did there?)… if you’re striving to implement a singleton, canada viagra pharmacies scam you’re probably wrong.  For all you guys that are right, canada viagra pharmacies scam I guess you’re right, canada viagra pharmacies scam and you can leave now, canada viagra pharmacies scam I guess.  This might help you out.

Canada viagra pharmacies scam I was reading a blog from Mr. Canada viagra pharmacies scam Dependency where he was talking about statics and basically what amounts to global state, canada viagra pharmacies scam and how thatultimate-geeks-multi-tool-hammer binds you into globally available, canada viagra pharmacies scam global data, canada viagra pharmacies scam which usually (always?) turns into anarchy.

Canada viagra pharmacies scam How do we always get ourselves into this mess if we know it’s bad in the first place?  Well, canada viagra pharmacies scam some of us (those who are now zombocomming, canada viagra pharmacies scam from above) don’t know it’s bad in the first place, canada viagra pharmacies scam and the rest of us probably do it because it’s easy to implement, canada viagra pharmacies scam and we understand it.  Long story short, canada viagra pharmacies scam we can do the singleton implementation in our sleep, canada viagra pharmacies scam so we pull out the singleton hammer, canada viagra pharmacies scam and smack the nail.  It always goes in a little sideways, canada viagra pharmacies scam but at least it goes in.

Canada viagra pharmacies scam Maybe we should be using a different hammer?

Canada viagra pharmacies scam What I’d like to do now, canada viagra pharmacies scam is propose to split singleton in two.  I think there are two distinct responsibilities that the current thought of ‘singleton’ introduces. Canada viagra pharmacies scam It:

  • Manages Session Scoping/Lifecycle/Lifestyle (albeit, canada viagra pharmacies scam poorly, canada viagra pharmacies scam only one strategy is available)
  • Disables the ability to create more

Canada viagra pharmacies scam When I talk about this out loud, canada viagra pharmacies scam I call the two approaches the singleton implementation pattern, canada viagra pharmacies scam and singleton lifecycle.

Canada viagra pharmacies scam What I am a fan of, canada viagra pharmacies scam is the singleton lifecycle.  You create one of those objects, canada viagra pharmacies scam and use it throughout the application.  You don’t get messy and allow global access to it all over the place (which necessarily happens when you have global state).  You intentionally inject it to collaborators, canada viagra pharmacies scam and  intentionally don’t inject it to non-collaborators (don’t just hand this guy out willy-nilly, canada viagra pharmacies scam he’s important).

Canada viagra pharmacies scam So naturally, canada viagra pharmacies scam the naysayers ask/demand:

Canada viagra pharmacies scam How do you manage that there is a public constructor on this class!?  Dev’s are going to be new’ing this thing up all over the place!

Canada viagra pharmacies scam I say:

Canada viagra pharmacies scam False.  Use a DI tool and let it manage it for you.  Or establish a convention with your team, canada viagra pharmacies scam and enforce it through social contracts. Canada viagra pharmacies scam

Canada viagra pharmacies scam Both of these approaches allow your scope lifecycle turn into whatever you want at any time, canada viagra pharmacies scam in case you decide global isn’t what you really want.  It can be application session scoped, canada viagra pharmacies scam or some other scope, canada viagra pharmacies scam test scoped, canada viagra pharmacies scam or whatever you want… incredibly flexible.

Canada viagra pharmacies scam If you go with the DI tool approach, canada viagra pharmacies scam instead of tying yourself to a particular scope, canada viagra pharmacies scam you can now have any scope you want, canada viagra pharmacies scam by changing a configuration parameter.  Delaying decisions until the latest responsible moment… seems like I’ve heard that one before.

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